Title of Invention

FIRE-RETARDANT, SELF FUSIBLE, WATER REPELLENT, ANTI TRACKING, HIGH TEMPERATURE WITHSTANDING SILICONE ELASTOMER TAPE FOR ELECTRICAL INSULATION AND THE PROCESS OF MANUFACTURING THE SAME

Abstract A process of manufacturing Fire-Retardant, Self Fusible, Water Repellant, Anti-Tracking And High Temperature Withstanding Silicone Elastomer Tape For Electrical Insulation comprising of formulation of silicone elastomer by compounding two or more special grade silicone elastomers having different hardness on a two-roll milling machine/Banbury machine, with fillers curing agents, and two or more additives as applicable to impart the properties of fire-retardancy and self fusibility. Extrusion / Calendering of formulated silicone elastomer to achieve the required thickness of the silicone elastomer tape by use of conventional extrusion / calendering methods followed by heating silicone elastomer tape by conventional methods and using polymeric film as carrier. The silicone elastomer tape so obtained is cut to desired sizes and shapes. Alternatively the said compounded silicone elastomer is then calendered /extruded on polymeric film like polyester film as carrier film and slit to desired sizes and shape followed by curing of the tape.
Full Text FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
& THE PATENTS RULES, 2003
COMPLETE SPECIFICATION (See Section 10 and rule 13)
1. TITLE OF THE INVENTION
"FIRE-RETARDANT, SELF FUSIBLE, WATER REPELLANT, ANTI TRACKING, HIGH TEMPERATURE WITHSTANDING SILICONE ELASTOMER TAPE FOR ELECTRICAL INSULATION" AND THE PROCESS OF MANUFACTURING THE SAME.
2. APPLICANTS
(a) Name : PRS Solutions Private Limited
(b) Nationality: Indian
(c) Address : 63, Bombay Samachar Marg, Mumbai - 400 001,
Maharashtra State, India
The following specification particularly describes the invention and the manner in which it is to be performed

FIELD OF THE INVENTION:
The invention relates to "Fire-Retardant, Self Fusible, Water Repellant, Anti Tracking, And High Temperature withstanding Silicone Elastomer Tape For Electrical Insulation" and the process of manufacturing the same.
DESCRIPTION OF THE PRIOR-ART:
Various types of electrical insulation tapes are available in the market. But the said tapes does not have all the properties such as self fusible, fire retardant, water repellant, anti-tracking properties. The electrical insulation tapes cause fire and loss of properties to the users of such tapes.
A variety of silicone rubbers are available for insulating and cushioning electrical and electronic assemblies. Silicone rubbers exhibit a wish list of characteristics including superb chemical resistance, high temperature performance, good thermal and electrical resistance, long term resiliency and easy fabrication. Liquid silicone rubbers are available in electrical grades for conformal coating, potting and gluing. Silicone rubbers filled with conducting fillers are available for applications requiring thermal conductivity.
Silicone elastomer compounded with pigments and curing agents and extruded / calendered to obtain it in tape form which is flexible is used in the
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insulation of inter connectors of Stator coils of traction motors, Busbar insulation. The tape being conformable can be wrapped on contours which results in no air gaps thus imparting good waterproof effect. The tape has good resistance to Corona discharges, weathering, oxidation and fungus attack. The tape however is not fire retardant. To overcome this problem, new tape having the above referred properties clubbed together with self fusibility and fire retardancy are included in the present invention.
The patent No. GB0869778A dated 7-6-1961 to GEN ELECTRIC is attributed to Electrically insulating material comprising of Polyester - glass cloth coated with silicone elastomer. This product is non-fire retardant and also has polyester and fiber glass cloth as its constituents and hence the patent is not related to the present invention.
SUMMARY OF THE INVENTION:
In the present invention a , silicone- elastomer tape is prepared having self fusible, fire-retardant, characteristics for high-temperature electrical insulation purpose.
A process of manufacturing of the "Fire-retardant,Self fusible, water repellant, anti-tracking and high temperature withstanding silicone elastomer tape for electrical insulation" comprises of a special grade of silicone elastomer
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suitably modified with fillers, additives and curing agents to impart the self fusible property and extruded / calendered in the form of tape having weight of 500-550 gms per square meter for 0.5mm thick tape. The thickness of tape can vary from 0.2mm to 10mm, commensurate with the desired properties of electric strength and breaking strength. The calendering / extrusion of the formulated silicone elastomer is carried out using conventional methods and using polymer film like polyester film as carrier material followed by curing of the tape.
The steps involved are as follows:
1) Formulation of silicone elastomer by compounding two or more special grade silicone elastomers having different hardness on a two-roll milling machine/Banbury machine, with fillers like oxides and / or hydroxides of metal, curing agents like organic peroxides and two or more additives as applicable to impart the properties of fire-retardancy and self fusibility.
2) The said compounded silicone elastomer having fire-retardancy and self fusibility property is then calendered / extruded on polymeric film like polyester film as carrier film followed by curing of the tape.
3) The calendered /extruded tape so obtained is cut to desired sizes and shapes.
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4) Alternatively the said compounded silicone elastomer having fire-
retardancy and self fusibility property is then calendered /extruded on
polymeric film like polyester film as carrier film and slit to desired sizes and
shape followed by curing of the tape.
5) The said tape has the following features:-
(a) Self Fusibiity
(b) Fire retardancy,
(c) High electrical insulation,
(d) Anti-tracking,
(e) High-temperature withstanding capability, and
(f) Water repellency.
This high temperature withstanding (Class-H) tape successfully passes the Underwriters Laboratories Specification UL-510 - flame retardancy test.
The said tape finds application in the insulation of inter connectors of Stator coils of traction motors, Busbar insulation etc.
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CONSTRUCTION:
///////////////////////////////////////////////// /////////////////////////////////////////////////

Formulated Silicone Elastomer with Self Fusible property Polyester film

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WE CLAIM:
1. A process of manufacturing Fire-Retardant, Self fusible, Water Repellant,
Anti-Tracking And High Temperature Withstanding Silicone Elastomer Tape
For Electrical Insulation" comprises of the following steps:-
(a) (i) Formulation of silicone elastomer by compounding two or more special grade silicone elastomers having different hardness on a two-roll milling machine/Banbury machine, with fillers like oxides and / or hydroxides of metal, curing agents, and two or more additives as applicable to impart the properties of fire-retardancy and self fusibility.
(a) (ii) Extrusion / Calendering of formulated silicone elastomer having fire-retardancy & self fusibility property to achieve the required thickness of the silicone elastomer tape by use of conventional extrusion / calendering methods followed by heating silicone elastomer tape by conventional methods & using polymeric film as carrier;
(a) (iii) the silicone elastomer tape so obtained is cut to desired sizes and
shapes.
(b) Alternatively the said compounded silicone elastomer having fire-
retardancy and self fusibility property is then calendered /extruded on
polymeric film like polyester film as carrier film and slit to desired sizes and
shape followed by curing of the tape.
2. A process of manufacturing "Fire-Retardant, Self fusible, Water Repellant,
Anti-Tracking And High Temperature Withstanding Silicone Elastomer Tape "
For Electrical Insulation" as claimed in Claim 1 wherein the said formulated
silicone elastomer is made by compounding two or more special grade
silicone elastomers having different hardness on a two-roll milling machine
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with fillers like oxides and / or hydroxides of metal, curing agents and two or more additives to impart the properties of fire-retardancy and self fusibility.
3. A process of manufacturing "Fire-Retardant, Self fusible, Water Repellant, Anti-Tracking And High Temperature Withstanding Silicone Elastomer Tape For Electrical Insulation" as claimed in Claim 1 and 2 wherein the polymeric film used as carrier can be polyester, polyurethane, PTFE .
4. A process of manufacturing "Fire-Retardant, Self fusible, Water Repellant, Anti-Tracking And High Temperature Withstanding Silicone Elastomer Tape For Electrical Insulation" as claimed in Claim 1 to 3, by which Fire-Retardant, Self Fusible, Water Repellant, Anti-Tracking And High Temperature Withstanding Silicone Elastomer Tape For Electrical Insulation" is obtained.
Dated this ZS day of October, 2006
(Bharat S. Shah) Duly Constituted Attorney
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ABSTRACT
A process of manufacturing Fire-Retardant, Self Fusible, Water Repellant, Anti-Tracking And High Temperature Withstanding Silicone Elastomer Tape For Electrical Insulation comprising of formulation of silicone elastomer by compounding two or more special grade silicone elastomers having different hardness on a two-roll milling machine/Banbury machine, with fillers curing agents, and two or more additives as applicable to impart the properties of fire-retardancy and self fusibility. Extrusion / Calendering of formulated silicone elastomer to achieve the required thickness of the silicone elastomer tape by use of conventional extrusion / calendering methods followed by heating silicone elastomer tape by conventional methods and using polymeric film as carrier. The silicone elastomer tape so obtained is cut to desired sizes and shapes. Alternatively the said compounded silicone elastomer is then calendered /extruded on polymeric film like polyester film as carrier film and slit to desired sizes and shape followed by curing of the tape.
(Bharat S. Shah) Duly Constituted Attorney

Documents:

1767-MUM-2006-ABSTRACT(11-2-2010).pdf

1767-mum-2006-abstract(26-10-2006).pdf

1767-MUM-2006-ABSTRACT(9-6-2009).pdf

1767-mum-2006-abstract(granted)-(10-11-2010).pdf

1767-mum-2006-abstract.pdf

1767-mum-2006-cancelled pages(11-2-2010).pdf

1767-MUM-2006-CANCELLED PAGES(9-6-2009).pdf

1767-mum-2006-claims(26-10-2006).pdf

1767-MUM-2006-CLAIMS(9-6-2009).pdf

1767-MUM-2006-CLAIMS(AMENDED)-(11-2-2010).pdf

1767-MUM-2006-CLAIMS(AMENDED)-(21-10-2010).pdf

1767-MUM-2006-CLAIMS(AMENDED)-(28-10-2010).pdf

1767-mum-2006-claims(granted)-(10-11-2010).pdf

1767-mum-2006-claims.pdf

1767-mum-2006-correspondance-po.pdf

1767-mum-2006-correspondance-received.pdf

1767-MUM-2006-CORRESPONDENCE(06-09-2010).pdf

1767-mum-2006-correspondence(21-2-2008).pdf

1767-MUM-2006-CORRESPONDENCE(28-10-2010).pdf

1767-MUM-2006-CORRESPONDENCE(9-6-2009).pdf

1767-mum-2006-correspondence(ipo)-(15-12-2009).pdf

1767-mum-2006-correspondence(ipo)-(18-11-2010).pdf

1767-mum-2006-description (complete).pdf

1767-mum-2006-description(complete)-(26-10-2006).pdf

1767-MUM-2006-DESCRIPTION(COMPLETE)-(9-6-2009).pdf

1767-mum-2006-description(granted)-(10-11-2010).pdf

1767-MUM-2006-DRAWING(11-2-2010).pdf

1767-mum-2006-drawing(granted)-(10-11-2010).pdf

1767-MUM-2006-FORM 1(9-6-2009).pdf

1767-mum-2006-form 18(21-2-2008).pdf

1767-mum-2006-form 2(9-6-2009).pdf

1767-mum-2006-form 2(complete)-(26-10-2006).pdf

1767-mum-2006-form 2(granted)-(10-11-2010).pdf

1767-MUM-2006-FORM 2(TITLE PAGE)-(11-2-2010).pdf

1767-mum-2006-form 2(title page)-(26-10-2006).pdf

1767-MUM-2006-FORM 2(TITLE PAGE)-(28-10-2010).pdf

1767-MUM-2006-FORM 2(TITLE PAGE)-(9-6-2009).pdf

1767-mum-2006-form 2(title page)-(granted)-(10-11-2010).pdf

1767-mum-2006-form 26(26-10-2006).pdf

1767-MUM-2006-FORM 3(21-10-2010).pdf

1767-MUM-2006-FORM 3(9-6-2009).pdf

1767-mum-2006-form 5(25-10-2006).pdf

1767-mum-2006-form 9(2-11-2007).pdf

1767-MUM-2006-FORM PCT-ISA-210(11-2-2010).pdf

1767-mum-2006-form-1.pdf

1767-mum-2006-form-2.doc

1767-mum-2006-form-2.pdf

1767-mum-2006-form-3.pdf

1767-mum-2006-form-5.pdf

1767-MUM-2006-PCT-IB-326(9-6-2009).pdf

1767-MUM-2006-PCT-ISA-237(9-6-2009).pdf

1767-MUM-2006-PETITION UNDER RULE 137(21-10-2010).pdf

1767-MUM-2006-REPLY TO EXAMINATION REPORT(11-2-2010).pdf

1767-MUM-2006-REPLY TO EXAMINATION REPORT(21-10-2010).pdf

1767-MUM-2006-REPLY TO EXAMINATION REPORT(5-2-2010).pdf

1767-MUM-2006-SPECIFICATION(AMENDED)-(11-2-2010).pdf

1767-MUM-2006-SPECIFICATION(AMENDED)-(28-10-2010).pdf


Patent Number 243910
Indian Patent Application Number 1767/MUM/2006
PG Journal Number 46/2010
Publication Date 12-Nov-2010
Grant Date 10-Nov-2010
Date of Filing 26-Oct-2006
Name of Patentee PRS SOLUTIONS PRIVATE LIMITED
Applicant Address 63, BOMBAY SAMACHAR MARG, MUMBAI
Inventors:
# Inventor's Name Inventor's Address
1 SHROFF PRADIP HIRALAL 1802 Wallace Apartments, Slater Road, Mumbai 400007
2 BHATTACHARYA SOMNATH A-5 Vyas Co-operative Housing Society Limited, 131, Model Town, Seven Bunglow, Andheri(W) MUmbai 400053
3 DIWADKAR NAYAN NARAYAN 81A/14, On Radhakrishna Co-Op. Housing Society Limited, Brindaban Complex, Thane(W) 400601,
PCT International Classification Number H01B11/18,H02K5/22
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA