Patent US2768427A successfully refreshed from Google Patents.
US4585705A
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US
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Hard organopolysiloxane release coating
Assignee: Dow Silicones Corp
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Filing: 1983-11-09
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Granted: 1986-04-29
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Expires: 2003-11-09
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
2026-10-29 19:01
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
200 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 ; (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, (D) from 0.48 to 6 parts by weight, based on 100 parts of (A), of a curing agent.
Claim 2
Dependent Claim
200 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 ; (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, (D) from 0.48 to 6 parts by weight, based on 100 parts of (A), of a curing agent.
Claim 3
Dependent Claim
46 words
A composition 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); 0.5 to 2 parts by weight of component (C) and, 1 to 3 parts by weight of component (D).
Claim 4
Dependent Claim
40 words
A composition as claimed in claim 2 wherein there is present 100 parts by weight of component (A); 90 parts by weight of component (B); 1 part by weight of component (C) and 1 part by weight of component (D).
Claim 5
Dependent Claim
40 words
A composition as claimed in claim 2 wherein there is present 100 parts by weight of component (A); 10 parts by weight of component (B); 2 parts by weight of component (C) and 2 parts by weight of component (D).
Claim 6
Dependent Claim
14 words
A composition as claimed in claim 2 wherein component (D) is a titanium ester.
Claim 7
Dependent Claim
13 words
A composition as claimed in claim 5 wherein the titanium ester is tetraisopropyltitanate.
Claim 8
Dependent Claim
13 words
A composition as claimed in claim 5 wherein the titanium ester is tetrabutyltitanate.
Claim 9
Dependent Claim
27 words
A composition as claimed in claim 2 wherein there is present up to 80 weight percent of an organic solvent, based on the weight of components (A)-(D).
Claim 10
Dependent Claim
12 words
A composition as claimed in claim 8 wherein the solvent is toluene.
Claim 11
Dependent Claim
29 words
A composition as claimed in claim 2 wherein there is present up to 80 weight percent of a mixture of organic solvents, based on the weight of components (A)-(D).
Claim 12
Dependent Claim
15 words
A composition as claimed in claim 10 wherein the solvents are toluene, isobutylisobutyrate and naphtha.
Claim 13
Dependent Claim
208 words
An article comprising a solid substrate coated with a curable 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 ; (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, (D) from 0.48 to 6 parts by weight, based on 100 parts of (A), of a curing agent.
Claim 14
Dependent Claim
208 words
An article comprising a solid substrate coated with a curable 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 ; (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, (D) from 0.48 to 6 parts by weight, based on 100 parts of (A), of a curing agent.
Claim 15
Dependent Claim
46 words
An article as claimed in claim 12 wherein the composition comprises 100 parts by weight of component (A); 80 to 120 parts by weight of component (B); 0.5 to 2 parts by weight of component (C) and, 1 to 3 parts by weight of component (D).
Claim 16
Dependent Claim
40 words
An article as claimed in claim 13 wherein the composition comprises 100 parts by weight of component (A); 100 parts by weight of component (B); 2 parts by weight of component (C) and 2 parts by weight of component (D).
Claim 17
Dependent Claim
14 words
An article as claimed in claim 14 wherein component (D) is a titanium ester.
Claim 18
Dependent Claim
13 words
An article as claimed in claim 15 wherein the titanium ester is tetraisopropyltitanate.
Claim 19
Independent Claim
235 words
A method of enhancing release from the surface of a solid substrate which method comprises (i) coating a solid substrate with 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 ; (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, (D) from 0.48 to 6 parts by weight, based on 100 parts of (A), of a curing agent and, (ii) curing the coating, whereupon a solid substrate, having enhanced release, is obtained.
Claim 20
Independent Claim
235 words
A method of enhancing release from the surface of a solid substrate which method comprises (i) coating a solid substrate with 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 ; (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, (D) from 0.48 to 6 parts by weight, based on 100 parts of (A), of a curing agent and, (ii) curing the coating, whereupon a solid substrate, having enhanced release, is obtained.
Claim 21
Dependent Claim
12 words
A method as claimed in claim 17 wherein the substrate is metal.
Claim 22
Dependent Claim
13 words
A method as claimed in claim 18 wherein the metal is aluminized steel.
Claim 23
Dependent Claim
17 words
A method as claimed in claim 19 wherein the aluminized steel is in the form of bakeware.
Claim 24
Dependent Claim
17 words
A method as claimed in claim 19 wherein the aluminized steel is in the form of cookware.
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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) | 1989-04-28 | 1989-10-28 | 1990-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-28 | 1993-10-28 | 1994-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-28 | 1997-10-28 | 1998-04-29 | $7700.00 | Window Closed / Lapsed |