US4681908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hard organopolysiloxane release coating
Assignee: Dow Silicones Corp
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Filing: 1985-10-31
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Granted: 1987-07-21
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Expires: 2005-10-31
Abstract
Abstract What is disclosed are organopolysiloxane release coatings which are curable on a substrate and which consist of a base siloxane copolymer containing CH 3 SiO 3/2 units; C 6 H 5 SiO 3/2 units, C 6 H 5 (CH 3 )SiO units and (C 6 H 5 ) 2 SiO units; CH 3 SiO 3/2 ; a fluid polysiloxane, and a curing agent. They are especially useful on commercial and household cookware and bakeware.
Inventors
- 👤 Dennis W. Broderick
- 👤 Harold L. Vincent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:03
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
183 words
A composition of matter comprising (A) 100 parts by weight of a hydroxyfunctional polysiloxane resin copolymer containing CH 3 SiO 3/2 units, C 6 H 5 SiO 3/2 units, (C 6 H 5 ) 2 SiO units and C 6 H 5 (CH 3 )SiO units wherein there is present 0.5 to 5 weight percent hydroxy radicals attached to silicon atoms, the organic group to silicon ratio is from 0.8 to 1.4 and the C 6 H 5 -- to silicon ratio is from 0.35 to 0.85; (B) from 4 to 240 parts by weight, based on 100 parts of (A), of CH 3 SiO 3/2 ; and (C) from 0.2 to 6 parts by weight, based on 100 parts of (A), of a fluid polysiloxane having the formula (RR'R"Si) 2 O[(CH 3 ) 2 SiO] x , wherein x has a value of from 250 to 850, R is OH or CH 3 -- and R' and R" are CH 3 --, wherein there is present in component (C), less than fifteen percent by weight of (CH 3 ) 3 SiO units.
Claim 2
Dependent Claim
183 words
A composition of matter comprising (A) 100 parts by weight of a hydroxyfunctional polysiloxane resin copolymer containing CH 3 SiO 3/2 units, C 6 H 5 SiO 3/2 units, (C 6 H 5 ) 2 SiO units and C 6 H 5 (CH 3 )SiO units wherein there is present 0.5 to 5 weight percent hydroxy radicals attached to silicon atoms, the organic group to silicon ratio is from 0.8 to 1.4 and the C 6 H 5 -- to silicon ratio is from 0.35 to 0.85; (B) from 4 to 240 parts by weight, based on 100 parts of (A), of CH 3 SiO 3/2 ; and (C) from 0.2 to 6 parts by weight, based on 100 parts of (A), of a fluid polysiloxane having the formula (RR'R"Si) 2 O[(CH 3 ) 2 SiO] x , wherein x has a value of from 250 to 850, R is OH or CH 3 -- and R' and R" are CH 3 --, wherein there is present in component (C), less than fifteen percent by weight of (CH 3 ) 3 SiO units.
Claim 3
Dependent Claim
39 words
A composition of matter as claimed in claim 1 wherein there is present 100 parts by weight of component (A); 80 to 120 parts by weight of component (B) and 0.5 to 2 parts by weight of component (C).
Claim 4
Dependent Claim
35 words
A composition of matter as claimed in claim 1 wherein there is present 100 parts by weight of component (A); 90 parts by weight of component (B) and 1 part by weight of component (C).
Claim 5
Dependent Claim
35 words
A composition of matter as claimed in claim 1 wherein there is present 100 parts by weight of component (A); 100 parts by weight of component (B) and 2 parts by weight of component (C).
Claim 6
Dependent Claim
15 words
A composition as claimed in claim 1 wherein there is also present an organic solvent.
Claim 7
Dependent Claim
13 words
A composition as claimed in claim 5 wherein the organic solvent is toluene.
Claim 8
Dependent Claim
17 words
A composition as claimed in claim 1 wherein there is also present a mixture of organic solvents.
Claim 9
Dependent Claim
15 words
A composition as claimed in claim 7 wherein the solvents are toluene, isobutylisobutyrate and naphtha.
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) | 1990-07-20 | 1991-01-19 | 1991-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-20 | 1995-01-19 | 1995-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-20 | 1999-01-19 | 1999-07-21 | $7700.00 | Window Closed / Lapsed |