Indian Patents. 209410:"LOW-FAT ABSORBING SELF-SUPPORTING FILMS MADE FROM FOOD GRADE STARCH AND OTHER EDIBLE MATERIALS"

Title of Invention	"LOW-FAT ABSORBING SELF-SUPPORTING FILMS MADE FROM FOOD GRADE STARCH AND OTHER EDIBLE MATERIALS"
Abstract	A process for the preparation of low-absorbing self-supporting films comprising the steps of: mixing a bland of 4 to 15% by weight of starch and 0.2 to 109. by weight of plastlcizers such as herein described and solvent to make a uniform suspension; pouring the suspension on a smooth plate, followed by spreading the suspension to form a film; drying said film, and;

Full Text	it- is not known tc/product non-let ) absorbing self-supportinQ films prepared solely "-TTom edible materials,, OBJECTS OF THE INVENTION It is therefore an object of this invention to provide a self-supporting film which is non-fat sbsorbjLo.Q- It is a further object of this invention to provide a self-supporting film which is biodegradable. Further objects and advantages of this invention will be apparent from the ensuing description- , BRIEF DESCRIPTION OF THE INVENTION Thus according to this invention is provided a process for the/ t preparation of low-absorbing self-support ing films comprising' the steps of s mixing a blend of starch, piasticizers and solvent to make a uniform suspension; pouring the suspension on a smooth plate, followed by spreading the suspension to form a film; drying said film; and peel ing off the same to obtain the low-absorb ing self-supporting films. According to this invention is further provided low-absorb ing i=e If-supporting film made from a blend of starch, pi ast ic: i sers &nd solvent. According to this invention is provided self-supporting films prepared by casting technique using blends of biopolymers and other functional agents, all edible materials which exhibit very-si ight-~to~no-absorption of oils while possessing a reasonably good transparency. The? f i lms can also be appl ied as a 2 wrapper or as a packaging aid for fats, oils, fatty foods, fried food products or greasy materials, confectionery items, snacks, cookies, etc. to - 2A - prevent migration of fat/oll or alike. The flims can be applied as partial substitute of some synthetic packaging materials, like poty-thene/polypropylene or alike when their appficattons are confined to low moisture foods or low relative humidity storage conditions. Unlike synthetic packaging materials and btopolymer- synthetic polymer blended films, these films are completely biodegradable or when discarded, could also be used as fodders. Al the Ingredients used are generally recognised as safe (GRAS). The fims are prepared using starches from cereal origin, preferably corn, wheat, rice, etc. as a major fngredfenf in the blends. Solvents) (water and/or ethanol In appropriate proportions), plasttelsers (ateoho"c and poryhydroxy compounds), other biopotymers (optional) such as proteins (from cereals or animals), cellulose and various cellulose derivations, etc. are also present in the blend. The process for the preparation of the ffens comprises mixing ingredients such as 4 to 15% w/w of starch; 0.2 to 10% w/w of ptostteteers; 0 to 5% w/w of blopolymers other than starch, singles or mixture and opt to rally upto 10% of cross-Unking agents, thoroughly at 80-100 °C to make a untform suspension, continuing to mix tor a further period of 10-20 minutes until the mass appeared to be transparent or translucent, pouring the mass on specialty cleaned plates, spreading the same to maintain uniform thickness, drying the mass at a temperature of 40-50 °C, peeling off the film storing/ageing the film under ambient conditions for a period of 3-6 months. For the step of pouring on plates, smooth plates such as coated glass, polymeric sheet or the lice are used. The mass Is spread on the plates in a uniform layer of thickness around 1-3mm. The spread mass on the plate to dried under low circulation of all and controlled temperature around 40-50 °C. Rapid drying is . detrimental to the ultimate quality of the firnis. -3- .4- The following properties of the films have been evaluated: WE CLAIM 1. A process for the preparation of low-absorbing self-support ing films comprising the steps of: mixing a blend of 4 to 15% by weight of starch and 0.2 to 10}t by weight of plasticizers such as herein described and solvent to make a untform suspension; pouring the suspension on a smooth plate, foflowed by spreading the suspension to form a film; drying said film, and; peeRng off the same to obtain the low-absorbing self-supporting films. 2. The process as claimed in claim 1 wherein said starch is of cereal origin, preferably corn, wheat, rice and the like. 3. The process as claimed In claim 1 wherein said solvent,comprises water, and etna no I, singly or in combination. 4. The process as claimed in claim 1 wherein satd plastlclzer Is selected from alcoholic and potyhydroxy compounds. 5. The orocess as claimed In claim 1 wherein other btopofymers may be optionally added to the biend. 6. The process as claimed In claim S wherein said blopofymers are selected from proteins from cereals or animals; cellulose and various cellulose derivatives. 7. The process as claimed In claim 1 wherein cross-Unking agents are optionally added to the bfend. -6- The process as claimed in claim 1 wherein cross-linking agents are present in 0 to 1% by weight. The process as claimed in claim 1 wherein other biopolymers are present in 0 to 5% by weight. The process as claimed in claim i wherein said mixing i© done o at a temperature of 80 to 100 C. The process as claimed in claim 1 wherein the mixing is continued for 10 to 20 minutes. The process as claimed in claim 1 wherein the mixino is continued till the mass appears to be transparent of vtranslucent. The process as claimed in claim 1 wherein said suspension is poured on a cleaned smooth plate such as coated glass, polymeric sheet or the like. The process as claimed in claim 1 wherein said suspension is spread to form a film of uniform thickness of 1 to 3mm. The process as claimed in claim i wherein said film is dried by circulation of air at a temperature of 40 to 50 C. The process as claimed in claim 1 wherein said dried film is stored in ambient condition for 3-6 months for ageing. Low-absorbing self-supporting film made from a blend of starch, plasticizers and solvent. Low-absorbing self-supporting film as claimed in claim 19 wherein said starch is of cereal origin, preferably corn, wheat, rice and the like. Low-absorbing self-supporting film as claimed in claim 19 wherein said solvent compri-ses water and ethanol, singly or in combination. Low-absorbing self-supporting film as claimed in claim 19 - 6- _ wherein said plasticizer is selected from alcoholic and polyhydroxy compounds. 9 Low-absorbing self-supporting film as claimed in claim 19 wherein other biopolymers may be optionally added to the blend. Low-absorbing sel f-support ing as claimed in claim 19 wherein said biopolymers are selected from proteins from cereals or animals; cellulose and various cellulose derivatives. Low-absorbing self-supporting film as claimed in claim 19 wherein cross-1 inking agents are optionally added to the blend. Low-absorb ing sel f-supporting film as claimed in claim 19 wherein starch is present in a proportion of 4 to 15% by weight. Low-absorbing se 1 f-supporting film as claimed in claim 19 wherein plasticizers are present in 0.2 to 10% by weight. Low-absorbing sel f-support ing film as claimed in claim* 19i. wherein cross-linking agents are present in 0 to 1% by wejrgh't. Low-absorbing sel f-support ing film as claimed in claim 19 wherein other biopolymers are present in 0 to 5% by weight. The process for the preparation of low-absorbing self-supporting fi1ms substanti ally as herein described and illustrated. The low-absorb ing self-supporting film substanti ally as herein described and i1 lustrated. A process for the preparation of low-absorbing self-supporting films comprising the steps of: mixing a bland of 4 to 15% by weight of starch and 0.2 to 109. by weight of plastlcizers such as herein described and solvent to make a uniform suspension; pouring the suspension on a smooth plate, followed by spreading the suspension to form a film; drying said film, and;

Full Text

it- is not known tc/product non-let ) absorbing self-supportinQ
films prepared solely "-TTom edible materials,, OBJECTS OF THE INVENTION
It is therefore an object of this invention to provide a self-supporting film which is non-fat sbsorbjLo.Q-
It is a further object of this invention to provide a self-supporting film which is biodegradable.
Further objects and advantages of this invention will be apparent
from the ensuing description- ,
BRIEF DESCRIPTION OF THE INVENTION
Thus according to this invention is provided a process for the/
t
preparation of low-absorbing self-support ing films comprising' the
steps of s
mixing a blend of starch, piasticizers and solvent to make a uniform suspension;
pouring the suspension on a smooth plate, followed by spreading the suspension to form a film; drying said film; and
peel ing off the same to obtain the low-absorb ing self-supporting films.
According to this invention is further provided low-absorb ing i=e If-supporting film made from a blend of starch, pi ast ic: i sers &nd solvent.
According to this invention is provided self-supporting films prepared by casting technique using blends of biopolymers and other functional agents, all edible materials which exhibit very-si ight-~to~no-absorption of oils while possessing a reasonably good transparency. The? f i lms can also be appl ied as a
2

wrapper or as a packaging aid for fats, oils, fatty foods, fried food products or greasy materials, confectionery items, snacks,
cookies, etc. to
- 2A -

prevent migration of fat/oll or alike. The flims can be applied as partial substitute of some synthetic packaging materials, like poty-thene/polypropylene or alike when their appficattons are confined to low moisture foods or low relative humidity storage conditions. Unlike synthetic packaging materials and btopolymer- synthetic polymer blended films, these films are completely biodegradable or when discarded, could also be used as fodders. Al the Ingredients used are generally recognised as safe (GRAS).
The fims are prepared using starches from cereal origin, preferably corn, wheat, rice, etc. as a major fngredfenf in the blends. Solvents) (water and/or ethanol In appropriate proportions), plasttelsers (ateoho"c and poryhydroxy compounds), other biopotymers (optional) such as proteins (from cereals or animals), cellulose and various cellulose derivations, etc. are also present in the blend.
The process for the preparation of the ffens comprises mixing ingredients such as 4 to 15% w/w of starch; 0.2 to 10% w/w of ptostteteers; 0 to 5% w/w of blopolymers other than starch, singles or mixture and opt to rally upto 10% of cross-Unking agents, thoroughly at 80-100 °C to make a untform suspension, continuing to mix tor a further period of 10-20 minutes until the mass appeared to be transparent or translucent, pouring the mass on specialty cleaned plates, spreading the same to maintain uniform thickness, drying the mass at a temperature of 40-50 °C, peeling off the film storing/ageing the film under ambient conditions for a period of 3-6 months.
For the step of pouring on plates, smooth plates such as coated glass, polymeric sheet or the lice are used. The mass Is spread on the plates in a uniform layer of thickness around 1-3mm. The spread mass on the plate to dried under low circulation of all and controlled temperature around 40-50 °C. Rapid drying is . detrimental to the ultimate quality of the firnis.
-3-

.4-
The following properties of the films have been evaluated:

WE CLAIM
1. A process for the preparation of low-absorbing self-support ing films
comprising the steps of:
mixing a blend of 4 to 15% by weight of starch and 0.2 to 10}t by weight of
plasticizers such as herein described and solvent to make a untform
suspension;
pouring the suspension on a smooth plate, foflowed by spreading the
suspension to form a film;
drying said film, and;
peeRng off the same to obtain the low-absorbing self-supporting films.
2. The process as claimed in claim 1 wherein said starch is of cereal origin,
preferably corn, wheat, rice and the like.
3. The process as claimed In claim 1 wherein said solvent,comprises water,
and etna no I, singly or in combination.
4. The process as claimed in claim 1 wherein satd plastlclzer Is selected from
alcoholic and potyhydroxy compounds.
5. The orocess as claimed In claim 1 wherein other btopofymers may be
optionally added to the biend.
6. The process as claimed In claim S wherein said blopofymers are selected from proteins from cereals or animals; cellulose and various cellulose derivatives.
7. The process as claimed In claim 1 wherein cross-Unking agents are optionally added to the bfend.
-6-

The process as claimed in claim 1 wherein cross-linking
agents are present in 0 to 1% by weight. The process as claimed in claim 1 wherein other biopolymers
are present in 0 to 5% by weight.
The process as claimed in claim i wherein said mixing i© done
o at a temperature of 80 to 100 C.
The process as claimed in claim 1 wherein the mixing is continued for 10 to 20 minutes.
The process as claimed in claim 1 wherein the mixino is continued till the mass appears to be transparent of vtranslucent. The process as claimed in claim 1 wherein said suspension is poured on a cleaned smooth plate such as coated glass, polymeric sheet or the like.
The process as claimed in claim 1 wherein said suspension is spread to form a film of uniform thickness of 1 to 3mm. The process as claimed in claim i wherein said film is dried by circulation of air at a temperature of 40 to 50 C. The process as claimed in claim 1 wherein said dried film is stored in ambient condition for 3-6 months for ageing. Low-absorbing self-supporting film made from a blend of starch, plasticizers and solvent.
Low-absorbing self-supporting film as claimed in claim 19 wherein said starch is of cereal origin, preferably corn, wheat, rice and the like.
Low-absorbing self-supporting film as claimed in claim 19 wherein said solvent compri-ses water and ethanol, singly or in combination. Low-absorbing self-supporting film as claimed in claim 19
- 6- _

wherein said plasticizer is selected from alcoholic and polyhydroxy compounds.
9
Low-absorbing self-supporting film as claimed in claim 19 wherein other biopolymers may be optionally added to the blend. Low-absorbing sel f-support ing as claimed in claim 19 wherein said biopolymers are selected from proteins from cereals or animals; cellulose and various cellulose derivatives. Low-absorbing self-supporting film as claimed in claim 19 wherein cross-1 inking agents are optionally added to the blend. Low-absorb ing sel f-supporting film as claimed in claim 19 wherein starch is present in a proportion of 4 to 15% by weight. Low-absorbing se 1 f-supporting film as claimed in claim 19 wherein plasticizers are present in 0.2 to 10% by weight. Low-absorbing sel f-support ing film as claimed in claim* 19i. wherein cross-linking agents are present in 0 to 1% by wejrgh't. Low-absorbing sel f-support ing film as claimed in claim 19 wherein other biopolymers are present in 0 to 5% by weight. The process for the preparation of low-absorbing self-supporting fi1ms substanti ally as herein described and illustrated. The low-absorb ing self-supporting film substanti ally as herein described and i1 lustrated.

A process for the preparation of low-absorbing self-supporting films comprising the steps of:
mixing a bland of 4 to 15% by weight of starch and 0.2 to 109. by weight of plastlcizers such as herein described and solvent to make a uniform suspension;
pouring the suspension on a smooth plate, followed by spreading the suspension to form a film;
drying said film, and;

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Patent Number

209410

Indian Patent Application Number

00244/CAL/1999

PG Journal Number

35/2007

Publication Date

31-Aug-2007

Grant Date

30-Aug-2007

Date of Filing

19-Mar-1999

Name of Patentee

INDIAN INSTIUTE OF TECHNOLOGY

Applicant Address

AN INDIAN INSTIUTE OF KHARAGPUR 721302, WEST BENGAL,INDIA

Inventors:

#	Inventor's Name	Inventor's Address
1	DR MADHUSWETA DAS	POST HARVEST TECHNOLOGY CENTRE, DEPARTMENT OF AGRICULTURAL & FOOD ENGINEERING, INDIAN INSTITUTE OF TECHNOLOGY, KHARGPUR
2	B R MANE	POST HARVEST TECHNOLOGY CENTRE, DEPARTMENT OF AGRICULTURAL & FOOD ENGINEERING, INDIAN INSTITUTE OF TECHNOLOGY, KHARGPUR
3	PROF SATISH BAL	POST HARVEST TECHNOLOGY CENTRE, DEPARTMENT OF AGRICULTURAL & FOOD ENGINEERING, INDIAN INSTITUTE OF TECHNOLOGY, KHARGPUR
4	DR SUSANTA KUMAR DAS	POST HARVEST TECHNOLOGY CENTRE, DEPARTMENT OF AGRICULTURAL & FOOD ENGINEERING, INDIAN INSTITUTE OF TECHNOLOGY, KHARGPUR
5	PROF AJIT KUMAR BANTHIA	MATERIAL SCIENCE CENTRE OF INDIAN INSTITUTE OF TECHNOLOGY, KHARAGPUR

PCT International Classification Number

A 23L 1/0522

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA