US4248750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions for forming peelable films
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1979-05-07
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Granted: 1981-02-03
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Expires: 1999-05-07
Abstract
Abstract Improved compositions for forming pellable films, such as adhesive-release backings, are disclosed which have antistatic characteristics, decreased peeling resistance with respect to adhesives and a more stable peeling efficiency with respect to aging. The improved compositions of this invention comprise a curable mixture of a vinyl-containing organopolysiloxane, an SiH-containing organopolysiloxane and a metal addition-catalyst which has mixed therewith an alcohol- and/or polyether-modified organopolysiloxane. This use of an alcohol- and/or polyether-modified organopolysiloxane provides a decreased static charge, less dust attraction, less blocking and better adhesive coating for the cured pellable film.
Inventors
- 👤 Ichiro Murakami
- 👤 Shosaku Sasaki
- 👤 Masamitsu Tanimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:49
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/20; C08G77/42; C08G77/46
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
199 words
In a curable composition for forming peelable films, said composition being obtained by mixing components comprising (a) an organopolysiloxane having a viscosity greater than 100 cP at 25° C. and having at least two silicon-bound vinyl groups per molecule, (b) an organohydrogenpolysiloxane containing at least two silicon-bound hydrogen radicals per molecule and (c) a catalytic amount of a metal catalyst for an addition reaction of silicon-bound vinyl groups with silicon-bound hydrogen radicals, the improvement comprising incorporating in the curable compositions (d) at least one organopolysiloxane bearing at least one silicon-bonded radical selected from the group consisting of alcohol radicals having the formula --R 1 OH and polyether radicals having the formula --(OR 1 ) l OR 2 , --(R 1 O) k R 2 , --(R 1 O) l R 2 or --O(R 1 O) k --, wherein R 1 denotes an alkylene radical, R 2 denotes a hydrogen radical or an inactivating endgroup, k is an integer greater than 2 and l is an integer greater than 1, there being in the improved composition from 1 to 40 parts by weight of component (d) for every 100 parts by weight of the total of components (a) and (b).
Claim 2
Dependent Claim
199 words
In a curable composition for forming peelable films, said composition being obtained by mixing components comprising (a) an organopolysiloxane having a viscosity greater than 100 cP at 25° C. and having at least two silicon-bound vinyl groups per molecule, (b) an organohydrogenpolysiloxane containing at least two silicon-bound hydrogen radicals per molecule and (c) a catalytic amount of a metal catalyst for an addition reaction of silicon-bound vinyl groups with silicon-bound hydrogen radicals, the improvement comprising incorporating in the curable compositions (d) at least one organopolysiloxane bearing at least one silicon-bonded radical selected from the group consisting of alcohol radicals having the formula --R 1 OH and polyether radicals having the formula --(OR 1 ) l OR 2 , --(R 1 O) k R 2 , --(R 1 O) l R 2 or --O(R 1 O) k --, wherein R 1 denotes an alkylene radical, R 2 denotes a hydrogen radical or an inactivating endgroup, k is an integer greater than 2 and l is an integer greater than 1, there being in the improved composition from 1 to 40 parts by weight of component (d) for every 100 parts by weight of the total of components (a) and (b).
Claim 3
Dependent Claim
21 words
The improved composition of claim 1 wherein component (d) is an organopolysiloxane which bears a multiple number of lower alcohol radicals.
Claim 4
Dependent Claim
18 words
The improved composition of claim 1 wherein component (d) is an organopolysiloxane which bears lower alkylene polyether radicals.
Claim 5
Dependent Claim
18 words
The improved compositions of claims 1, 2 or 3 wherein component (c) is platinum or a platinum compound.
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) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |