Title of Invention

COMPOSITION FOR INSOLE AND OUTERSOLE OF DIABETIC FOOTWEAR AND FOOTWEAR MANUFACTURED USING THE COMPOSITION

Abstract Composition for insole and outersole of diabetic footwear and Footwear manufactured using the novel rubber composition. The present invention relates to a novel rubber composition comprising Natural rubber (Pale latex crepe), Styrene butadiene rubber, preferably SBR 1958, Penta chloro thio phenol, Zinc oxide, Titanium dioxide, Stearic acid, Styrenated phenol, Calcium carbonate, Silica, Napthenic oil, Azodicarbonamides (ADC light), Benzothiazyl-2-morpholinyl sulphenamide (MOZ), Sulphur, Diethylene glycol, Black pigment, Red pigment and Brown pigment in a pre determined ratio which is described as herein with the provision that Styrene butadiene, Titanium dioxide, Diethylene glycol are not the ingredients for insole preparation and calcium carbonate of insole is totally replaced by silica in the outer sole of a specially designed footwear meant for a diabetic foot.
Full Text FIELD OF INVENTION
The present invention relates to a novel rubber composition. The present invention further relates to a process for the preparation of the novel rubber composition. The present invention further relates to the use of the novel rubber composition for the sole preparation wherein sole includes inner sole and outer sole of footwear. The present invention further includes the use of the footwear manufactured by using the novel composition of the present invention either for prevention of ulcers in a diabetic foot or for healing the ulcers in a diabetic foot.
PRIOR ART
The footwear industry mainly concentrates on the outer look including shape, pattern, colour combinations of the footwear to attract the customers. The designs vary according to various age groups starting from infants to the old. For example, shoes made especially for babies make a different noise, which in turn encourages the baby to do walk more. For a slightly grown up children shoes are available where a light glows on pressure generated at the time of walking. Similarly high heel sandals or chappals or shoes are made available in the market for the people who would like to appear taller. In the same way a lot of variations in the footwear design are available. Insoles are also made with projections, which massage specific areas of foot. This preamble is given here to understand how the progress of footwear design is seen in the footwear industry-Research was continued on various rubber compositions wherein the used rubbers have little or no wear and tear thus enabling the use of footwear for a longer period. Using these rubbers, the constituents of which exhibits more flexibility avoids the problem of 'tear". Combinations of different rubber compositions are also being used to obtain the desired characteristics of footwear at an optimum level.
Later on, the designers started looking at particular designs, which may help in the functional rather than the cosmetic aspects. Footwear was made to ease the muscular pain either in foot region or in calf muscle region. As the demand increased for such specially designed footwear, a serious search was made to see whether footwear could be used for any improved performances like prevention or healing of any ulcers. The present invention is directed to this view.

PROBLEMS WITH THE PRIOR ART
Ideas concerning conventionally available footwear are limited to aesthetic look of the footwear. The inventors of the present invention started looking at the footwear in totally different perspective - whether footwear can be used either for prevention or healing of ulcers in the feet of patients with diabetes. The inventor has had interactions with the doctors in the field of treating diabetic foot infections and has large experience in treating the Diabetic Foot in particular. The Present inventors have made constant and continuous efforts to invent the novel rubber compositions of the present invention. The novel idea of the inventors of the present invention is how best the footwear can be used either to heal or prevent the formation of ulcers on a foot especially on a diabetic foot as the people who are diabetic are more susceptible to develop ulcers.
To the knowledge of the present inventors so far, no attempt has been made to prepare a sole including outer sole having hardness gradation within the thickness of the sole or linking thickness, hardness and the like properties towards either prevention or healing the ulcers in a diabetic foot.
SUMMARY OF THE INVENTION
The salient features to achieve the objectives of the invention depend on optimum hardness, optimum thickness and density of the sole that may be insole or outer sole. On conducting three dimensional finite element modeling and analysis scientifically the present inventors have developed various designs of footwear wherein the shape and configuration of the footwear is designed with respect to the diagnosis made on a patient. In other words depending upon the requirements of a patient, the patient is advised to wear particular design footwear. Encouraging and unexpected positive results were achieved while the scientifically designed footwear was prescribed to diabetic patients. Initially all these experiments were done with the conventionally available rubbers that includes MCR, MCP and the like. The present applicant has filed two patent applications which are pending for a grant of patent with the Indian Patent Office on the date of filing of this application. The scientifically calculated footwear designs and their method of manufacture were disclosed in the two co-pending applications. All these experiments were restricted to the conventionally available rubbers. As it is known in the prior art various kinds of rubbers or rubber compositions are used depending upon the requirement. The characteristics of rubbers like tensile strength, tear and wearing rates, pressure withstanding capacity etc., sways at extreme levels depending upon the nature of the rubber and the expected utility of the rubber are used for the manufacture of a footwear.
On our continued medical research on the prevention and/or healing of ulcers in diabetic foot lead us to think on developing a novel rubber composition which can be used for the manufacture of a footwear and better utility of the footwear for the public and to diabetic patients in particular.

The main ingredients to prepare a sole are selected from Natural rubber (Pale latex crepe), Penta chloro thio phenol, Zinc oxide, Titanium dioxide, Stearic acid, Styrenated phenol, Calcium carbonate, Silica, Napthenic oil, Azodicarbonamides (ADC light), Benzothiazyl-2-morpholinyl sulphenamide (MOZ), Sulphur, Diethylene glycol, Black pigment, Red pigment and Brown pigment. To obtain a sole having predetermined characteristics the ingredients are selected from the list given above and it is to be understood that all the ingredients listed above are not necessarily to be included. Further any modifications known in the prior art are understood to be included irrespective of the purpose of such modification provided unless until such modification(s), if any, does not affect the objects of the present invention.
OBJECTS OF THE INVENTION
The foremost object of the present invention is to invent a novel rubber composition that is used for the preparation of footwear usable by general public and diabetic patients in particular.
The next object of the present invention is to invent a novel rubber composition that is used for an exclusive preparation of inner sole of footwear.
The next object of the present invention is to invent a novel rubber composition that is used for an exclusive preparation of outer sole of footwear.
The next object of the present invention is to scientifically decide the required characteristcs of the moulds made out of the novel rubber composition of the present invention.
The next object of the present invention is to invent a rubber composition that can exhibit density gradation within.
The next object of the present invention is to manufacture the footwear made out of the novel rubber composition of the present invention.
The next object of the present invention is to design and manufacture the footwear as prescribed by the doctor after diagnosing the patient and a diabetic patient in particular.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
In fact the accompanying drawings of the present invention are flow charts.
Drawing 1 is a flow chart that describes how the sole inner or outer of the footwear is prepared.
Drawing 2 is also a flow chart wherein the manufacture of diabetic footwear is shown.

DETAILED DESCRIPTION OF THE INVENTION
Diabetic patients have chronic foot problem that develop into ulcers. Bare foot walking aggravates this problem. Wearing of footwear helps the patients by preventing foot ulcer formation. The thickness, hardness and density of the insole and outer sole of the footwear play an important role in designing the footwear. The unique footwear also redistributes the excess pressure from discrete high pressure points to different areas of the foot.
There is at present no scientific evidence as to the nature of the diabetic footwear in addressing the foot problems of the diabetic patients. Therefore the object of the present invention is either to prevent or to heal the ulcers of the diabetic patients.
The footwear available in the market does not follow any pattern and is also different from the parameters the present inventors have arrived. Salient features such as optimum hardness, thickness and density of insole and outer sole made out of the rubber compositions of the present invention are considered to be one of the breakthroughs in overcoming the deficiencies in currently available footwear.
The aim of the present invention is to invent a novel rubber composition that is mainly intended to use the said novel rubber composition for the preparation of footwear that in turn is useful both for prevention and healing of ulcers of a diabetic foot. The "FOOTWEAR" as herein described should be understood as footwear that is inclusive of chappals, shoes, sandals etc. The shape of the footwear does not have any significance as far as the invention is related to novel rubber composition. But in our co-pending applications, numbered as 1213/CHE/2004 AND 1214/CHE/2004 wherein we have disclosed the specially and scientifically designed footwear made out of conventional rubber compositions which are meant for the similar purpose that is either for preventing or healing the ulcers of a diabetic foot. The continued efforts and research towards humans suffering from diabetics, most preferably diabetics with foot problems has lead to the invention of a novel rubber composition of the present invention. As disclosed in our above co-pending applications the characteristics of the design, shape, thickness, hardness and density gradation and like properties are extended to the present invention wherein the footwear are manufactured using the novel rubber composition of the present invention.
Though the aim of the present invention is related a novel rubber composition and further aim to manufacture of a footwear useful either to prevent or heal ulcers, if any, of a diabetic foot, nothing prevents any person, having no diabetic complaint from using the footwear made out of the novel rubber composition of the present invention.
Accordingly the present invention relates to a novel rubber composition comprising Natural rubber (Pale latex crepe), Penta chloro thio phenol, Zinc oxide, Titanium dioxide, Stearic acid, Styrenated phenol, Calcium carbonate, Silica, Napthenic oil,

Azodicarbonamides (ADC light), Benzothiazyl-2-morpholinyl sulphenamide (MOZ), Sulphur, Diethylene glycol, Black pigment, Red pigment and Brown pigment in a predetermined ratio.
Accordingly the present invention also relates to a process of manufacturing a footwear wherein the footwear is manufactured by using the novel composition of the rubber composition of the present invention comprising the steps of mater batch mixing and final batch mixing as herein described.
The footwear comprises of two layers that is insole and outer sole. As any person skilled in that knows it the desired properties of insole and outer sole are different. Generally the insole which is in direct contact with the bare foot is expected to be soft and does not harm the skin in any manner which is inclusive of friction, wounds developed by friction etc., On the other hand the outer sole is expected to be harder than the inner sole and shall possess less flexibility and in contrast with the inner sole, shall have higher tensile strength, lower tear and wear etc., As explained in our co-pending applications the present inventors have explained the importance of maintaining the density gradation in the sole for preventing and or healing the ulcers of a diabetic foot. Therefore an attempt has been made to alter some of the ingredients of the novel rubber composition as described herein above. During the research it was concluded that the reduction percent by weight of the total composition or elimination of one or few ingredients serves a better purpose than using the same composition for the preparation of inner sole and outer sole.
According to the present invention the insole of a footwear is prepared from the novel rubber composition wherein the said novel rubber composition comprising Natural rubber (Pale latex crepe), Pentachloro thio phenol, Zinc oxide, Stearic acid, Styrenated phenol, Calcium carbonate, Napthenic oil, Azodicarbonamides, Sulphur, Benzothiazyl-2-morphollinylsulphenamides, Black pigment, Brown pigment and Red pigment.
Most preferably the percent by weight of the ingredients by total weight of the novel rubber composition of the insole according to the present invention are;
INGREDIENT PERCENT WEIGHT BY WEIGHT
Natural rubber (Pale Latex crepe) 48 - 68
Pentachloro thio Phenol 0.03 - 0.13
Zinc Oxide 0.74-2.74
Stearic acid 0.82 - 0.90
Styrenated phenol 0.48 - 0.68
Calcium Carbonate 10.74 -12.74

Napthenic Oil 20.29 -22.29
Azodicarbodinamides (ADC - light) 1.00 - 3.00
Sulphur 0.8-1.40
Benzothiazyl-2-morpholinylsulphenamide (MOZ) 0.3 - 0.7
Black Pigment 0.1-0.3
Red Pigment 0.87-1.07
Brown Pigment 0.87 - 1.07
The weight tolerance for the above ingredients can be + / - 0.01%.
According to the present invention the outer sole of a footwear is prepared from the novel rubber composition wherein the said novel rubber composition comprises Natural rubber (Pale latex crepe), Styrene butadiene rubber 1958, Pentachloro thio phenol, Zinc oxide, Titanium Oxide, Stearic acid, Styrenated phenol, Silica, Napthenic oil, Diethylene glycol, Azodicarbonamides, Sulphur, Benzothiazyl-2-morphollinylsulphenamides, Black pigment, Brown pigment and Red pigment.
Most preferably the ingredients percent by weight of the total rubber composition of the present invention given as herein under for the preparation of OUTER SOLE of the footwear.
INGREDIENTS PERCENT WEIGHT BY WEIGHT
Natural rubber (Pale Latex Crepe) 25.45 -35.45
Styrene butadiene rubber 1958 25.45 -35.45
Penta chloro thio phenol 0.02 - 0.06
Zinc oxide 1.30 -2.30
Titanium dioxide 1.33 -2.33
Stearic acid 0.86 -0.96
Styrenated phenol 0.56 - 0.66
Silica 13.40 - 14.40
Napthenic oil 14.40 -15.40

Diethylene glycol 0.10 -0.30
Sulphur 1.00 -1.20
Benzothiazyl-2-morpholinylsulphenamide (MOZ) 0.40 - 0.60 Benzothiazyl-2-Sulphene Morphalide (MBS)
Azodicarbonamides (ADC - Light) 1.00 - 3.00
Black Pigment 0.09 - 0.29
Red Pigment 0.85-1.05
Brown Pigment 0.85 - 1.05
Weight tolerance for above ingredients can be 0.01 %
It is also to be construed as part of the invention that the insole and outer sole have the physical parameters as disclosed in our co-pending application. For the sake of brevity the required physical characteristics are reproduced herein.
INSOLE
Hardness — 20 + 2 degree Shore
Thickness — 7-11 mm
Density 0.52 to 0.62 gm/cc
Visual appearance: No wrinkles and abnormality on the surface.
OUTER SOLE
Hardness
Topside 40 +/- 2 degree Shore
Bottom side 50 +/- 2 degree Shore
Thickness 9-14
Specific gravity 0.34 + / - 0.03 gm/cc
Visual appearance: No wrinkles and abnormality.
Now the invention is explained by describing the methods of preparation of insole and outer sole.

Method of manufacturing insole and outer sole though having the same conceptual idea slightly differs in their methods of preparation as the ingredients required to manufacture differs by one or two ingredients of the novel rubber composition of the invention. Though insole and outer sole have different characteristics either insole or outer sole cannot be used in its entirety or without using its counter part. Hence both the insole and outer sole are taken apiece for the manufacture of footwear of special use.
Preparation of a sole (insole and outer sole) comprises the following steps;
A) MASTER BATCH MIXING
B) FINAL BATCH MIXING
C) MATURATION
D) MOULDING
However the steps A and B are different for the preparation of insole and outer sole but the steps C and D are common for the preparation of insole and outer sole.
PREPARATION OF INSOLE (A & B STEPS ONLY)
A) MASTER BATCH MIXING:
Adjust the two roll mill nip gap to 2 to 3 mm and put natural rubber in open mill. Make smooth band by 4-5 cuts. Then reduce the mill gap to 0.5 to 0.8 mm. Add penta chloro thio phenol and form a smooth band and allow the chemical to mix with rubber matrix. Add Zinc oxide, Stearic acid, Calcium carbonate and half of napthenic oil with the rubber and give 2 to 3 cuts for the chemical to mix with rubber matrix. Add styrenated phenol with remaining napthenic oil and give 4 to 5 cuts for the oil to mix with rubber matrix. After all the chemicals are added, sheet out the rubber compound from the mixing mill and preserve it for atleast 6 hours at the ambient temp, of 25° C~35° C before taking it to final batch mixing.
B) FINAL BATCH MIXING
Add Sulphur and MOZ with master batch and give 2 to 3 cuts. Add ADC(L) and pigments and give 2 to 3 cuts for the chemical to mix with rubber matrix. After all the chemicals are added, sheet out the rubber compound from the mixing mill and preserve it for maturation at controlled temperature of 15° to 25° Celcius.

PREPARATION OF OUTER SOLE (A & B STEPS ONLY)
A) MASTER BATCH MIXING:
The ingredients are weighed according to appropriate proportion in a weighing
balance.
(i) Adjust the two roll mill nip gap to 2 - 3 mm and put natural rubber and allow it
to form band. Add penta chloro thio phenol and allow it to get into rubber by
giving 2 to 3 cuts and to keep the stock separately.
(ii) Put SBR 1958 in two roll mill mixing and allow it to form band and give 2-3 cuts and to keep the stock separately.
(iii) Add (i) and (ii) in two roll mixing mill and to mix it to form homogenous band by feeding 4 to 5 times endwise with nip gap of 0.5 to 0.8 mm.
(iv) Open the nip gap to 1 mm and add zinc oxide, titanium dioxide, stearic acid, silica and half of napthenic oil and 4 to 5 cuts for allowing the chemicals to mix with rubber.
(v) Add styrenated phenol, diethylene glycol and remaining napthenic oil and give 3 to 4 cuts for allowing the oil to mix with rubber and give 2 to 3 cuts
(vi) sheet out the rubber compound from the mixing mill and preserve it for 6 hours at the ambient temp, of 25° C - 35° C before taking it to final batch mixing.
B) FINAL BATCH MIXING
(i) Add sulphur and MOZ with master batch and give 2 to 3 cuts,
(ii) Add ADC (L) and pigments and give 2 to 3 cuts for the chemicals to
mix with rubber,
(iii) Increase the nip gap after adding all the chemicals to 3 to 4 mm,
(iv) Sheet out the rubber stock from the mixing mill
(v) Apply Zinc stearate on the sheet surface to avoid sticking
(vi) Preserving the sheet for maturation at controlled temperature of
(vii) 15° -25° Celsius.
Now the common steps of C & D shall be explained in detail for the preparation of insole and outer sole.

C) MATURATION
Maturation is a process by virtue of which insole and outer sole rubbers are allowed to cool at ambient temperature so that the viscosity of the rubber gets stabilized. This will help to prevent defects in the moulding process.
Duration of maturation is 4 hours (minimum)
The compound, which crossed the shelf life of 3 days, should not be taken to
moulding.
D) MOULDING
Moulding is the final step and the most critical step as only in this step the required hardness, thickness, specific gravity or density including the gradation is to be obtained critically.
Insole Hardness is critical because it has to be compatible with the foot sole. A gradation is made for the insole hardness so as to fit to the wide category of diabetic patients.
Outer sole Hardness is critical because it should withstand abrasion during walking. Specific gravity is important because the footwear has to be lighter in weight. Thickness is important because it has the influence on foot pressure.
The moulding is carried out in a conventional compression moulding press and the conditions to be maintained for the insole and outer sole are as follows;
FOR INSOLE
Temperature: 165° Celsius + / - 5 ° Celsius Time: 15 minutes No. of Bumps: 4 FOR OUTER SOLE
Temperature: 175 °Celsius + / - 5 ° Celsius for Top Platen
185 ° Celsius + /- 5 ° Celsius for Bottom platen.
Time: 10 minutes No. of Bumps: 4

The invention is described with the reference to the embodiment mainly to explain the salient feature of the invention. The invention is not restricted to this embodiment and within the scope and ambit various modifications are possible. The scope of the invention is appended in the following claims.
WE CLAIM
1) A novel rubber composition comprising Natural rubber (Pale latex crepe), Styrene
butadiene rubber, preferably SBR 1958, Penta chloro thio phenol, Zinc oxide,
Titanium dioxide, Stearic acid, Styrenated phenol, Calcium carbonate, Silica,
Napthenic oil, Azodicarbonamides (ADC light), Benzothiazyl-2-morpholinyl
sulphenamide (MOZ), Sulphur, Diethylene glycol, Black pigment, Red pigment
and Brown pigment in a pre determined ratio which is described as herein with
the provision that Styrene butadiene, Titanium dioxide, Diethylene glycol are not
the ingredients for insole preparation and calcium carbonate of insole is totally
replaced by silica in the outer sole of a specially designed footwear meant for a
diabetic foot.
2) The novel rubber composition for the preparation of INSOLE as claimed in claim
1 comprising;
INGREDIENT PERCENT WEIGHT BY WEIGHT
Natural rubber (Pale Latex Crepe) 48 - 68
Pentachloro thio Phenol 0.03 -0.13
Zinc Oxide 0.74 - 2.74
Stearic acid 0.82 - 0.90
Styrenated phenol 0.48 - 0.68
Calcium Carbonate 10.74 - 12.74
Napthenic Oil 20.29 - 22.29
Azodicarbodinamides (ADC - light) 1.00 - 3.00
Sulphur 0.8-1.40
Benzothiazyl-2-Sulphene Monpholide (MBS) 0.3 - 0.7

Black Pigment 0.1 - 0.3
Red Pigment 0.87-1.07
Brown Pigment 0.87 - 1.07
Weight tolerance for above ingredients can be 0.01 %
3) The novel rubber composition as claimed in claim 1 wherein the composition of an OUTER SOLE comprising the ingredients of;
INGREDIENTS PERCENT WEIGHT BY WEIGHT
Natural rubber 25.45 -35.45
Styrene butadiene rubber 1958 25.45 -35.45
Penta chloro thio phenol 0.02 -0.06
Zinc oxide 1.30 -2.30
Titanium dioxide 1.33 -2.33
Stearicacid 0.86 -0.96
Styrenated phenol 0.56 - 0.66
Silica 13.40 -14.40
Napthenicoil 14.40 -15.40
Diethylene glycol 0.10 -0.30
Sulphur 1.00 -1.20
Benzothiazyl-2-Sulphene Monpholide (MBS) 0.40 - 0.60
Azodicarbonamides (ADC - Light) 1.00 - 3.00
Black Pigment 0.09 - 0.29
Red Pigment 0.85-1.05

Brown Pigment 0.85 -1.05
Weight tolerance for above ingredients can be 0.01 %
3) A process for the preparation of a rubber compound having the rubber
composition of claim 1 wherein the process of preparation of the said compound
comprising the steps of
a) master batch mixing
b) final batch mixing
c) maturation &
d) moulding
with the provision that the steps (a) and (b) are different and the steps (c) and (d) are common for the preparation of insole and outer sole of footwear.
4) The process for the preparation of a insole as claimed in claim 3 comprising the
steps of;
a) MASTER BATCH MIXING:
(i) adjusting the two roll mill nip gap to 2 to 3 mm and putting
natural rubber in open mill; (ii) making smooth band by 4-5 cuts; (iii) then reducing the mill gap to 0.5 to 0.8 mm; (iv) adding penta chloro thio phenol and form a smooth band and
allow the chemical to mix with rubber matrix; (v) adding Zinc oxide, Stearic acid, Calcium carbonate and half
of napthenic oil with the rubber and give 2 to 3 cuts for the
chemical to mix with rubber matrix; (vi) adding styrenated phenol with remaining napthenic oil and
give 4 to 5 cuts for the oil to mix with rubber matrix. After all
the chemicals are added, sheet out the rubber compound from
the mixing mill;
b) FINAL BATCH MIXING
(i) adding Sulphur and MOZ with master batch and give 2 to 3
cuts; (ii) adding ADC (L) and pigments and give 2 to 3 cuts for the
chemical to mix with rubber matrix; (iii) after all the chemicals are added, sheet out the rubber
compound from the mixing mill and preserve it for
maturation at controlled temperature of 15 to 25 degree
Celcius;

c) MATURATION
Duration of maturation is 4 hours (minimum)
The compound, which crossed the shelf life of 3 days, should not be taken to moulding
d) MOULDING
Moulding is carried out in a conventional compressing moulding press wherein the moulding conditions for the preparation of an insole are;
Temperature: 165 ° Celsius + / - 5 ° Celsius Time: 15 minutes No. of Bumps: 4
5) The process of preparation of an OUTER SOLE as claimed in claim 3 wherein the said process comprising the steps of;
a) MASTER BATCH MDONG:
The ingredients are weighed according to appropriate proportion in a weighing
balance.
(i) Adjust the two roll mill nip gap to 2 - 3 mm, and put natural rubber and allow it
to form band. Add penta chloro thio phenol and allow it to get into rubber by
giving 2 to 3 cuts and to keep the stock seperately.
(ii) Put SBR 1958 in two roll mill mixing and allow it to form band and give 2-3 cuts and to keep the stock seperately.
(iii) Add (i) and (ii) in two roll mixing mill and to mix it to form homogenous band by feeding 4 to 5 times endwise with nip gap of 0.5 to 0.8 mm.
(iv) open the nip gap to 1 mm and add zinc oxide, titanium dioxide, stearic acid, silica and half of napthenic oil and 4 to 5 cuts for allowing the chemicals to mix with rubber.
(v) Add styrenated phenol, diethylene glycol and remaining napthenic oil and give 3 to 4 cuts for allowing the oil to mix with rubber and give 2 to 3 cuts
(vi) sheet out the rubber compound from the mixing mill.

b) FINAL BATCH MIXING
i) Add sulphur and MOZ with master batch and give 2 to 3 cuts,
ii) Add ADC (L) and pigments and give 2 to 3 cuts for the chemicals to
mix with rubber,
iii) increase the nip gap after adding all the chemicals to 3 to 4 mm, iv) sheet out the rubber stock from the mixing mill v) apply Zinc stearate on the sheet surface to avoid sticking vi) preserving the sheet for maturation at controlled temperature of 15
- 25 ° Celsius.
c) MATURATION
Duration of maturation is 4 hours (minimum)
The compound, which crossed the shelf life of 3 days, should not be taken to moulding
d) MOULDING
Moulding is carried out in a conventional compressing moulding press wherein the moulding conditions for the preparation of an outer sole are;
Temperature: 175 ° Celsius + / - 5 ° Celsius for Top Platen
185 °Celsius + /- 5 ° Celsius for Bottom platen.
Time: 10 minutes No. of Bumps: 4
6) An insole used for a footwear meant for a diabetic foot and prepared as claimed in claim 4 has the properties of;
Hardness — 20 + 2 degree Shore
Thickness — 7-11 mm
Density 0.52 to 0.62 gm/cc
Visual appearance: No wrinkles and abnormality on the surface.
7) An outer sole used for a footwear meant for a diabetic foot and prepared as claimed in claim 5 has the properties of;
Hardness
Topside 40 +/- 2 degree Shore

Bottom side 50 +/- 2 degree Shore
Thickness 10-14 mm
Specific gravity 0.34 + / - 0.03 gm/cc
Visual appearance: No wrinkles and abnormality.
8) A footwear comprising an insole and or outer sole as prepared by the claims 4 and
or 5.
9) A footwear as claimed in the preceding claim is a chappal, sandal or shoe and the
like.
Dated this October 2006


Documents:

2023-CHE-2006 AMANDED PAGES OF SPECIFICATION 29-10-2009.pdf

2023-CHE-2006 CORRESPONDENCE OTHERS.pdf

2023-CHE-2006 CORRESPONDENCE PO.pdf

2023-CHE-2006 EXAMINATION REPORT REPLY RECEIVED 27-10-2009.pdf

2023-CHE-2006 EXAMINATION REPORT REPLY RECEIVED 29-10-2009.pdf

2023-CHE-2006 FORM 9.pdf

2023-CHE-2006 OTHER DOCUMENT 27-10-2009.pdf

2023-CHE-2006 OTHER DOCUMENT 29-10-2009.pdf

2023-che-2006-abstract.pdf

2023-che-2006-claims.pdf

2023-che-2006-correspondnece-others.pdf

2023-che-2006-correspondnece-po.pdf

2023-che-2006-description(complete).pdf

2023-che-2006-drawings.pdf

2023-che-2006-form 1.pdf

2023-che-2006-form 18.pdf


Patent Number 244913
Indian Patent Application Number 2023/CHE/2006
PG Journal Number 53/2010
Publication Date 31-Dec-2010
Grant Date 24-Dec-2010
Date of Filing 03-Nov-2006
Name of Patentee SUNDARAM MEDICAL FOUDATION
Applicant Address IV AVENUE SHANTHI COLONY, ANNA NAGAR, CHENNAI-600040
Inventors:
# Inventor's Name Inventor's Address
1 R. DHAMODHARAN IV AVENUE SHANTHI COLONY, ANNA NAGAR, CHENNAI-600040
PCT International Classification Number C08L7/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA