US5264499A
Expired / Lapsed
US
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Organopolysiloxane composition for the formation of a cured release film
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1992-12-17
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Granted: 1993-11-23
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Expires: 2012-12-17
Abstract
Abstract The instant invention pertains to an organopolysiloxane composition for the formation of a release film, that has a high curing rate at relatively low temperatures (≦100° C.) and that forms a cured film that both adheres strongly to various types of substrates and is highly releasing for tacky or sticky substances. The organopolysiloxane composition for the formation of a cured release film of the instant invention comprises (A) organopolysiloxane that contains in each molecule at least 2 alkenyl groups with the general formula H 2 C═CH--(CH 2 ) n --, wherein n=2 to 8; (B) an organohydrogenpolysiloxane that contains in each molecule at least 2 silicon-bonded hydrogen atoms and at least 1 alkenyl group with the general formula H 2 C═CH--(CH 2 ) n --, wherein n=2 to 8; (C) an addition-reaction inhibitor; (D) platinum group metal catalyst; and optionally (E) a nonreactive organopolysiloxane that contains neither silicon-bonded alkenyl nor silicon-bonded hydrogen.
Inventors
- 👤 Masushi Hayashi
- 👤 Nobuo Kaiya
- 👤 Shosaku Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:48
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C09; C09D; C09D183/00; C09D183/04; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
130 words
A cured release film forming organopolysiloxane composition obtained by curing the following composition comprising (A) an organopolysiloxane with an average unit formula .sup.R b.sup.SiO (4-b)/2 that contains in each molecule at least 2 alkenyl groups with the general formula H.sub.2 C═CH--(CH.sub.2).sub.n -- where in n has a value of 2 to 8; (B) 1 to 200 weight parts per 100 weight parts of (A) of an organohydrogenpolysiloxane that contains in each molecule at least 2 silicon-bonded hydrogen atoms and at least 1 alkenyl group with the general formula H.sub.2 C═CH--(CH.sub.2).sub.n -- wherein n has a value of 2 to 8, (C) an addition-reaction inhibitor, and (D) a platinum group metal catalyst wherein R is selected from a substituted or unsubstituted monovalent hydrocarbon group, b has a value of 1.9 to20.5.
Claim 2
Dependent Claim
130 words
A cured release film forming organopolysiloxane composition obtained by curing the following composition comprising (A) an organopolysiloxane with an average unit formula .sup.R b.sup.SiO (4-b)/2 that contains in each molecule at least 2 alkenyl groups with the general formula H.sub.2 C═CH--(CH.sub.2).sub.n -- where in n has a value of 2 to 8; (B) 1 to 200 weight parts per 100 weight parts of (A) of an organohydrogenpolysiloxane that contains in each molecule at least 2 silicon-bonded hydrogen atoms and at least 1 alkenyl group with the general formula H.sub.2 C═CH--(CH.sub.2).sub.n -- wherein n has a value of 2 to 8, (C) an addition-reaction inhibitor, and (D) a platinum group metal catalyst wherein R is selected from a substituted or unsubstituted monovalent hydrocarbon group, b has a value of 1.9 to20.5.
Claim 3
Dependent Claim
23 words
A cured release film forming organopolysiloxane composition as claimed in claim 1 wherein in component (A) the alkenyl group is a hexenyl group.
Claim 4
Dependent Claim
23 words
A cured release film forming organopolysiloxane composition as claimed in claim 1 wherein in component (B) the alkenyl group is a hexenyl group.
Claim 5
Dependent Claim
23 words
A cured release film forming organopolysiloxane composition as claimed in claim 1 wherein the platinum group metal catalyst is a chloroplatinic acid/divinyltetramethyldisiloxane complex.
Claim 6
Dependent Claim
18 words
A cured release film forming organopolysiloxane composition as claimed in claim 1 wherein the addition-reaction inhibitor is 3,5-dimethyl-1-hexyn-3-ol.
Claim 7
Dependent Claim
22 words
A cured release film forming organopolysiloxane composition as claimed in claim 1 wherein the alkenyl organopolysiloxane (A) is a silanol-endblocked hexenylmethylsiloxane-dimethylsiloxane copolymer.
Claim 8
Dependent Claim
20 words
A cured release film forming organopolysiloxane composition as claimed in claim 1 wherein the organohydrogenpolysiloxane (B) is a dimethylsiloxane-hexenylmethylsiloxane-hydrogenmethylsiloxane copolymer.
Claim 9
Dependent Claim
28 words
A cured release film forming organopolysiloxane composition as claimed in claim 1 which additionally comprises (E) a nonreactive organopolysiloxane that contains neither silicon- bonded alkenyl nor silicon-bonded hydrogen.
Claim 10
Dependent Claim
32 words
A cured release film forming organopolysiloxane composition as claimed in claim 8 wherein the nonreactive organopolysiloxane (E) is present at a quantity up to 200 weight parts per 100 parts of (A).
Claim 11
Dependent Claim
22 words
A cured release film forming organopolysiloxane composition as claimed in claim 8 wherein the nonreactive organopolysiloxane (E) is a trimethylsiloxy-endblocked dimethylpolysiloxane gum.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-22 | 1997-05-24 | 1997-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-22 | 2001-05-24 | 2001-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-22 | 2005-05-24 | 2005-11-23 | $7700.00 | Window Closed / Lapsed |