US4952657A
Expired / Lapsed
US
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Silicone release coating compositions
Assignee: General Electric Co
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Filing: 1988-07-29
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Granted: 1990-08-28
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Expires: 2008-07-29
Abstract
Abstract Organopolysiloxane for use in release coating compositions arre modified to control release values by substitution with phenolic compounds.
Inventors
- 👤 Karen D. Riding
- 👤 Judith Stein
- 👤 Richard P. Eckberg
- 👤 James L. Desorcie
- 👤 Tracey M. Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:48
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/42; C09; C09D; C09D183/00; C09D183/04; C09D183/06; C08G77/04; C08G77/38
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
138 words
A UV-cured silicone release composition comprising: (i) a release modified organopolysiloxane having a viscosity between 100 and 1500 centipoise at 25° C. and comprising units, in sufficient number to increase release, of the formula: R.sub.a R.sub.b.sup.1 SiO.sub.(4-a-b)/2 wherein R is hydrogen, C.sub.(1-8) alkyl, or C.sub.(1-8) aryl, R 1 is a monovalent phenolic radical of from 6 to 26 carbon atoms; a is 0, 1 or 2; b is 1, 2, or 3; and a+b is 1, 2 or 3, and comprising units, in sufficient number to properly cure said coating composition, of the formula: R.sub.a R.sub.c.sup.2 SiO.sub.(4-a-c)/2 wherein R and a are given above; R 2 is a monovalent epoxy functional organic radical; c is 1, 2 or 3 and a+c is 1, 2 or 3, and (ii) effective catalyst to promote cure with exposure to UV light.
Claim 2
Dependent Claim
138 words
A UV-cured silicone release composition comprising: (i) a release modified organopolysiloxane having a viscosity between 100 and 1500 centipoise at 25° C. and comprising units, in sufficient number to increase release, of the formula: R.sub.a R.sub.b.sup.1 SiO.sub.(4-a-b)/2 wherein R is hydrogen, C.sub.(1-8) alkyl, or C.sub.(1-8) aryl, R 1 is a monovalent phenolic radical of from 6 to 26 carbon atoms; a is 0, 1 or 2; b is 1, 2, or 3; and a+b is 1, 2 or 3, and comprising units, in sufficient number to properly cure said coating composition, of the formula: R.sub.a R.sub.c.sup.2 SiO.sub.(4-a-c)/2 wherein R and a are given above; R 2 is a monovalent epoxy functional organic radical; c is 1, 2 or 3 and a+c is 1, 2 or 3, and (ii) effective catalyst to promote cure with exposure to UV light.
Claim 3
Dependent Claim
35 words
The silicone release composition of claim 1 wherein said release modified organopolysiloxane comprises from 0.5 to 25% by number units with R 1 substitution and 0.5 to 50% by number units with R 2 substitution.
Claim 4
Dependent Claim
74 words
The silicone release composition of claim 1 wherein R 1 has the formula: ##STR3## where A 1 is --CH 2 --CH 2 -- or --CH═CH--, R 3 is a divalent hydrocarbon radical of from 1 to 18 carbon atoms, R 4 is hydrogen, halogen or a monovalent organic moiety, R 5 is hydrogen or a monovalent substituted or unsubstituted hydrocarbon radical of from 1 to 18 carbon atoms, and d is 0 or 1.
Claim 5
Dependent Claim
89 words
The silicone release composition of claim 1 wherein said release modified organopolysiloxane comprises units of the formula: R 3 SiO 1/2 , RR 1 SiO 2/2 , R 2 SiO 2/2 and RR 2 SiO 2/2 ; or units of the formula RSiO 3/2 , RR 1 SiO 2/2 , R 2 SiO 2/2 and RR 2 2 SiO 1/2 ; or units of the formula RR 2 SiO 2/2 , R 2 SiO 2/2 and RR 2 1 SiO 1/2 where R 2 monovalent epoxy functional organic radical.
Claim 6
Dependent Claim
15 words
The release composition of claim 1 wherein A 1 is --CH 2 --CH 2 --.
Claim 7
Dependent Claim
16 words
The release composition of claim 3 comprising from 0.5 to 20% by weight R 1 .
Claim 8
Dependent Claim
13 words
The release composition of claim 3 wherein R 5 is C 1-3 alkyl.
Claim 9
Dependent Claim
13 words
The release composition of claim 3 wherein R 5 is C 6 aryl.
Claim 10
Dependent Claim
13 words
The release composition of claim 3 wherein R 5 is C 1-6 carbonyl.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |