Patent EP0144167A2 successfully refreshed from Google Patents.
EP0144167A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Hard organopolysiloxane release coating
Assignee: Dow Silicones Corp
•
Filing: 1984-11-07
•
Granted: —
•
Expires: 2004-11-07
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 32 units; C 6 H 5 SiO 32 units, C 6 H 5 (CH 3 )SiO units and (C 6 H 5 ) 2 SiO units; CH 3 SiO 32 ; a fluid polysiloxane, and a curing agent. They are especially useful on commercial and household cookware and bakeware.
Inventors
- 👤 Dennis William Broderick
- 👤 Harold Lewis Vincent
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 15:38
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 11
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 CH3-, wherein there is present in component (C), less than fifteen percent by weight of (CH 3 ) 3 SiO units; and (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 CH3-, wherein there is present in component (C), less than fifteen percent by weight of (CH 3 ) 3 SiO units; and (D) from 0.48 to 6 parts by weight, based on 100 parts of (A), of a curing agent.
Claim 3
Dependent Claim
14 words
A composition as claimed in claim 1 wherein component (D) is a titanium ester.
Claim 4
Dependent Claim
14 words
A composition as claimed in claim 1 wherein there is also a solvent present.
Claim 5
Dependent Claim
16 words
A composition as claimed in claim 1 wherein there is also present a mixture of solvents.
Claim 6
Dependent Claim
13 words
An article comprising a solid substrate coated with a composition of matter comprising
Claim 7
Dependent Claim
13 words
An article comprising a solid substrate coated with a composition of matter comprising
Claim 8
Dependent Claim
196 words
(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 S - 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; and (D) from 0.48 to 6 parts by weight, based on 100 parts of (A), of a curing agent.
Claim 9
Dependent Claim
196 words
(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 S - 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; and (D) from 0.48 to 6 parts by weight, based on 100 parts of (A), of a curing agent.
Claim 10
Independent Claim
236 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; and (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 11
Independent Claim
236 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; and (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.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.