US4234713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curable solventless organopolysiloxane compositions
Assignee: Dow Silicones Corp
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Filing: 1979-05-29
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Granted: 1980-11-18
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Expires: 1999-05-29
Abstract
Abstract What is disclosed is platinum catalyzed mixtures of silicon hydride and CH 2 ═CHSi--containing siloxanes which also contain {CH 2 ═CH(CH 3 ) 2 SiO} 2 Si(C 6 H 5 ) 2 as a reactive diluent which give curable products having improved handling properties while retaining essential mechanical properties in the cured composition.
Inventors
- 👤 Gary E. Legrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:15
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/54; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/20; C08G77/70
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
144 words
An improved curable composition consisting essentially of a mixture of (a) an organopolysiloxane containing from 67 to 85 mol percent C 6 H 5 SiO 3/2 units and 33 to 15 mol percent of CH 2 ═CH(CH 3 ) 2 SiO 1/2 units, said organopolysiloxane having an average of at least 8 silicon atoms per molecule; (b) a silicon hydride containing polysiloxane crosslinker for (a), said (b) being present in an amount sufficient to provide about 0.9 to 1.1 mol of silicon hydride per mol of CH 2 ═CHSi present in (a) and (d); (c) a platinum catalyst in an amount sufficient to catalyze the reaction of the silicon hydride with the CH 2 ═CHSi--; the improvement comprising adding a reactive diluent (d) having the formula {CH.sub.2 ═CH(CH.sub.3).sub.2 SiO}.sub.2 Si(C.sub.6 H.sub.5).sub.2 in a ratio of 1:4 to 1:1 of component (d) to component (a).
Claim 2
Dependent Claim
144 words
An improved curable composition consisting essentially of a mixture of (a) an organopolysiloxane containing from 67 to 85 mol percent C 6 H 5 SiO 3/2 units and 33 to 15 mol percent of CH 2 ═CH(CH 3 ) 2 SiO 1/2 units, said organopolysiloxane having an average of at least 8 silicon atoms per molecule; (b) a silicon hydride containing polysiloxane crosslinker for (a), said (b) being present in an amount sufficient to provide about 0.9 to 1.1 mol of silicon hydride per mol of CH 2 ═CHSi present in (a) and (d); (c) a platinum catalyst in an amount sufficient to catalyze the reaction of the silicon hydride with the CH 2 ═CHSi--; the improvement comprising adding a reactive diluent (d) having the formula {CH.sub.2 ═CH(CH.sub.3).sub.2 SiO}.sub.2 Si(C.sub.6 H.sub.5).sub.2 in a ratio of 1:4 to 1:1 of component (d) to component (a).
Claim 3
Dependent Claim
40 words
A curable composition as claimed in claim 1 wherein (c), the platinum catalyst, is present in an amount sufficient to provide at least 0.1 parts by weight platinum per million parts of the combined weight of (a), (b) and (d).
Claim 4
Dependent Claim
33 words
A curable composition as claimed in claim 1 wherein (b) is present in an amount sufficient to provide about 1.0 mol of silicon hydride per mol of CH 2 ═CHSi--in (a) and (d).
Claim 5
Dependent Claim
25 words
A curable composition as claimed in claim 1 wherein the amount of (d) present is 25 parts and there is present 75 parts of (a).
Claim 6
Dependent Claim
9 words
A composition as claimed in claim 1 when cured.
Claim 7
Dependent Claim
35 words
A composition as claimed in claim 2 wherein the platinum catalyst (c) is {R 3 PPtCl 2 } 2 and R is selected from a group consisting of the methyl, ethyl, propyl and butyl radicals.
Claim 8
Dependent Claim
24 words
A composition as claim in claim 6 wherein the platinum catalyst (c) is ((C 4 H 9 ) 3 PPtCl 2 ) 2 .
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) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |