US4681808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adhesion of silicone elastomer to polyurethane
Assignee: Dow Silicones Corp
•
Filing: 1986-10-02
•
Granted: 1987-07-21
•
Expires: 2006-10-02
Abstract
Abstract When a silicone elastomeric coating is applied over a polyurethane foam to protect it, an adhesion problem arises. It has been found that a coating of from 0.05 to 0.2 grams per square foot of surface of a silane of the formula ZSi (OR) 3 , where Z is an amine functional radical and R is a monovalent hydrocarbon radical having from 1 to 6 carbon atoms, applied to the polyurethane foam under the silicone elastomeric coating greatly improves the adhesion between them. The silicone elastomeric coating is a particular type of tin catalyzed silicone coating comprising a particular organosilicon resin, a hydroxy-ended silicone polymer, and filler.
Inventors
- 👤 Harold V. Lefler, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:26
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/04; C08J7/0427; C08J7/043; C08J7/05; C08J2375/00; C08J2375/04; C08J2483/00; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249955; Y10T428/249958; Y10T428/31504; Y10T428/31551; Y10T428/31598; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
195 words
A method of improving the adhesion of a silicone elastomeric coating to a polyurethane substrate consisting essentially of applying to the polyurethane surface from 0.05 to 0.2 grams per square foot of surface of a silane of the formula ZSi(OR) 3 where Z is an amine functional radical and R is a monovalent hydrocarbon radical having from 1 to 6 carbon atoms, then applying a coating of a silicone elastomeric composition comprising the product obtained by mixing: (A) from 1.0 to 400 parts by weight of the reaction product of (i) an organosilicon resin consisting essentially of R" 3 SiO 1 / 2 units and SiO 4/2 units, wherein R" represents a monovalent hydrocarbon radical, and the ratio of R" 3 SiO 1/2 units to SiO 4/2 units is from 0.6/1 to 0.9/1, and (ii) a polyorganohydrogensiloxane; (B) 100 parts by weight of a polydiorganosiloxane having the general formula HO(R' 2 SiO) x H, wherein R' represents a monovalent hydrocarbon radical and x has a value of from 10 to 1000; (C) from 1 to 150 parts by weight of a filler; and (D) from 0.10 to 13.3 parts by weight of an organotin catalyst.
Claim 2
Independent Claim
195 words
A method of improving the adhesion of a silicone elastomeric coating to a polyurethane substrate consisting essentially of applying to the polyurethane surface from 0.05 to 0.2 grams per square foot of surface of a silane of the formula ZSi(OR) 3 where Z is an amine functional radical and R is a monovalent hydrocarbon radical having from 1 to 6 carbon atoms, then applying a coating of a silicone elastomeric composition comprising the product obtained by mixing: (A) from 1.0 to 400 parts by weight of the reaction product of (i) an organosilicon resin consisting essentially of R" 3 SiO 1 / 2 units and SiO 4/2 units, wherein R" represents a monovalent hydrocarbon radical, and the ratio of R" 3 SiO 1/2 units to SiO 4/2 units is from 0.6/1 to 0.9/1, and (ii) a polyorganohydrogensiloxane; (B) 100 parts by weight of a polydiorganosiloxane having the general formula HO(R' 2 SiO) x H, wherein R' represents a monovalent hydrocarbon radical and x has a value of from 10 to 1000; (C) from 1 to 150 parts by weight of a filler; and (D) from 0.10 to 13.3 parts by weight of an organotin catalyst.
Claim 3
Dependent Claim
40 words
The method of claim 1 in which the silane is of the formula H 2 N(CH 2 CH 2 NH) y (CH 2 ) z --where y is 0 or 1, and z is an integer of 1 to 6.
Claim 4
Dependent Claim
11 words
The method of claim 2 in which the silane is gamma-aminopropyltriethoxysilane.
Claim 5
Dependent Claim
11 words
The method of claim 2 in which the silane is gamma-aminopropyltrimethoxysilane.
Claim 6
Dependent Claim
16 words
The laminate of polyurethane, silane and silicone elastomeric composition obtained by the method of claim 1.
References Cited (Backward Citations)
US3619256A
Cited
US4311737A
Cited
US4332844A
Cited
US4486565A
Cited
US4471007A
Cited
US4595610A
Cited
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 |