US4059473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Primer compositions
Assignee: Shin-Etsu Chemical Co Ltd
•
Filing: 1976-05-25
•
Granted: 1977-11-22
•
Expires: 1996-05-25
Abstract
Abstract The primer compositions consist essentially of a mercapto-containing organosilane or organopolysiloxane as one component and a titanic acid ester as the other. They are suitable for adhesively bonding a room-temperature-curing silicone rubber elastomer irrespective of its crosslinking mechanism to various substrates. The bond obtained by use of the primer composition is very strong and highly resistant to water or sea water even on prolonged immersion at high temperatures.
Inventors
- 👤 Takehide Okami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:54
CPC Classifications
C; C09; C09J; C09J5/00; C09J5/02; C08; C08K; C08K5/00; C08K5/04; C08K5/05; C08K5/057; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31609; Y10T428/31612; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
99 words
A primer composition consisting essentially of ( 1) 2 to 98 parts by weight of a mercapto-containing organosilane or organopolysiloxane represented by the average unit formula ##EQU2## where R 1 is an alkylene group having 1 to 4 carbon atoms, R 2 is a substituted or unsubstituted monovalent hydrocarbon group, X is a hydroxy or hydrolyzable atom or group and a, b, and c have values as expressed by 0<a≦1, 0≦b≦1 and 0<c≦3, respectively, with the proviso that a+b+c has the value as expressed by 0<(a+b+c)≦4 and (2) 98 to 2 parts by weight of a titanic acid ester.
Claim 2
Dependent Claim
99 words
A primer composition consisting essentially of ( 1) 2 to 98 parts by weight of a mercapto-containing organosilane or organopolysiloxane represented by the average unit formula ##EQU2## where R 1 is an alkylene group having 1 to 4 carbon atoms, R 2 is a substituted or unsubstituted monovalent hydrocarbon group, X is a hydroxy or hydrolyzable atom or group and a, b, and c have values as expressed by 0<a≦1, 0≦b≦1 and 0<c≦3, respectively, with the proviso that a+b+c has the value as expressed by 0<(a+b+c)≦4 and (2) 98 to 2 parts by weight of a titanic acid ester.
Claim 3
Dependent Claim
16 words
The primer composition as claimed in claim 1 wherein said R 1 is a propylene group.
Claim 4
Dependent Claim
16 words
The primer composition as claimed in claim 1 wherein said R 2 is a methyl group.
Claim 5
Dependent Claim
19 words
The primer composition as claimed in claim 1 wherein said hydrolyzable group denoted by X is a methoxy group.
Claim 6
Dependent Claim
14 words
The primer composition as claimed in claim 1 wherein said component (1) is 3-mercaptopropyltrimethoxysilane.
Claim 7
Dependent Claim
22 words
The primer composition as claimed in claim 1 wherein said organopolysiloxane is a condensate of a partial cohydrolyzate of 3-mercaptopropylmethyldimethoxysilane and 3-mercaptopropyltrimethoxysilane.
Claim 8
Dependent Claim
27 words
The primer composition as claimed in claim 1 wherein said titanic acid ester is selected from the group consisting of tetraisopropyl titanate, tetrabutyl titanate and tetra(2-ethylhexyl) titanate.
Claim 9
Dependent Claim
28 words
The primer composition as claimed in claim 1 wherein the amount of said components (1) and (2) is in the ratio of from 10:90 to 90:10 by weight.
Claim 10
Independent Claim
140 words
A method for adhesively bonding a room-temperature-curing silicone rubber elastomer to a substrate which comprises applying to the surface of the substrate a primer composition consisting essentially of (1) 2 to 98 parts by weight of a mercapto-containing organosilane or organopolysiloxane represented by the average unit formula ##EQU3## where R 1 is an alkylene group having 1 to 4 carbon atoms, R 2 is a substituted or unsubstituted monovalent hydrocarbon group, X is a hydroxy or hydrolyzable atom or group and a, b, and c have values as expressed by 0<a≦1. 0≦b≦1 and 0<c≦3, respectively, with the proviso that a=b=c has the value as expressed by 0<(a+b+c ≦ 4 and (2) 98 to 2 parts by weight of a titanic acid ester, contacting the uncured elastomer with the thus primed surface, and subjecting the thus contacted elastomer to curing conditions.
Claim 11
Independent Claim
140 words
A method for adhesively bonding a room-temperature-curing silicone rubber elastomer to a substrate which comprises applying to the surface of the substrate a primer composition consisting essentially of (1) 2 to 98 parts by weight of a mercapto-containing organosilane or organopolysiloxane represented by the average unit formula ##EQU3## where R 1 is an alkylene group having 1 to 4 carbon atoms, R 2 is a substituted or unsubstituted monovalent hydrocarbon group, X is a hydroxy or hydrolyzable atom or group and a, b, and c have values as expressed by 0<a≦1. 0≦b≦1 and 0<c≦3, respectively, with the proviso that a=b=c has the value as expressed by 0<(a+b+c ≦ 4 and (2) 98 to 2 parts by weight of a titanic acid ester, contacting the uncured elastomer with the thus primed surface, and subjecting the thus contacted elastomer to curing conditions.
Claim 12
Dependent Claim
33 words
The method as claimed in claim 9 wherein said primer composition is applied to the surface of the substrate in an amount larger than 5 g per square meter of the surface area.
References Cited (Backward Citations)
US2774690A
Cited
US2736721A
Cited
US3321350A
Cited
US3398045A
Cited
US3312669A
Cited
US3306918A
Cited
US3364059A
Cited
US3619255A
Cited
US3772122A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |