Patent US4133938A successfully refreshed from Google Patents.
US4133938A
Expired / Lapsed
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Primer compositions for silicone elastomers
Assignee: Wacker Chemical Corp
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Filing: 1977-04-15
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Granted: 1979-01-09
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Expires: 1997-04-15
Abstract
Abstract Compositions that may be used as primers for bonding silicone elastomers to porous substrates which are obtained from the reaction of an acrylate and an acryloxyalkylakoxysilane in the presence of a free radical initiator and an organic solvent.
Inventors
- 👤 Thomas G. Bingham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:52
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/04; C09D183/06; C04; C04B; C04B41/00; C04B41/45; C04B41/46; C04B41/49; C04B41/4905; C04B41/4988; C09D143/00; C09D143/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
161 words
A method for bonding a room temperature vulcanizable organopolysiloxane composition to a porous masonry substrate which bonded composite will be in contact with water which comprises applying to the masonry substrate a solution consisting essentially of a product obtained from the reaction of an acrylate and an acryloxyalkylalkoxysilane in the presence of a free radical initiator and an organic solvent, evaporating off the solvent and thereafter applying a room temperature vulcanizable modified organopolysiloxane composition to the dried substrate, said room temperature vulcanizable modified organopolysiloxane composition is obtained from the polymerization of an organopolysiloxane of the formula ##STR7## in which R"" is selected from the class consisting of monovalent hydrocarbon radicals, halogenated monovalent hydrocarbon radicals having from 1 to 18 carbon atoms and a cyanoalkyl radical and x is a number of from 0 to 20,000, with a polymerizable organic monomer having aliphatic unsaturation in the presence of a free radical initiator and thereafter adding a cross-linking agent to the modified organopolysiloxane.
Claim 2
Independent Claim
161 words
A method for bonding a room temperature vulcanizable organopolysiloxane composition to a porous masonry substrate which bonded composite will be in contact with water which comprises applying to the masonry substrate a solution consisting essentially of a product obtained from the reaction of an acrylate and an acryloxyalkylalkoxysilane in the presence of a free radical initiator and an organic solvent, evaporating off the solvent and thereafter applying a room temperature vulcanizable modified organopolysiloxane composition to the dried substrate, said room temperature vulcanizable modified organopolysiloxane composition is obtained from the polymerization of an organopolysiloxane of the formula ##STR7## in which R"" is selected from the class consisting of monovalent hydrocarbon radicals, halogenated monovalent hydrocarbon radicals having from 1 to 18 carbon atoms and a cyanoalkyl radical and x is a number of from 0 to 20,000, with a polymerizable organic monomer having aliphatic unsaturation in the presence of a free radical initiator and thereafter adding a cross-linking agent to the modified organopolysiloxane.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein the reaction is conducted at a temperature such that the free radical initiator has a half-life of about 4 hours.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein the free radical initiator is an organic peroxide.
Claim 5
Dependent Claim
40 words
The method of claim 1 wherein the solution contains from 50 to 60 percent by weight of the product obtained from the reaction of the acrylate and the acryloxyalkylalkoxysilane based on the total weight of the solvent and the product.
Claim 6
Dependent Claim
12 words
The method of claim 1 wherein the acrylate is an alkyl acrylate.
Claim 7
Dependent Claim
10 words
The method of claim 1 wherein the acryloxyalkylalkoxysilane is methacryloxyalkyltrialkoxysilane.
Claim 8
Dependent Claim
10 words
The method of claim 6 wherein the methacryloxyalkyltrialkoxysilane is methacryloxypropyltrimethoxysilane.
Claim 9
Dependent Claim
16 words
The method of claim 1 wherein the acrylate is ethyl acrylate and the acryloxyalkylalkoxysilane is methacryloxypropyltrimethoxysilane.
Claim 10
Dependent Claim
14 words
The method of claim 1 wherein the organic solvent is a halogenated organic solvent.
Claim 11
Dependent Claim
47 words
The method of claim 1 wherein the cross-linking agent is a silane of the formula X.sub.4-t SiY.sub.t in which X is selected from the class consisting of an alkyl and aryl group, Y is a hydrolyzable group and t is a number of from 3 to 4.
Claim 12
Dependent Claim
29 words
The method of claim 10 wherein the cross-linking agent is present in an amount of from 0.5 to 10 percent by weight based on the weight of the organopolysiloxane.
Claim 13
Dependent Claim
25 words
The method of claim 1 wherein the cross-linking agent is selected from the class consisting of polyalkoxysilanes and polyalkoxysiloxanes and further contains a curing catalyst.
Claim 14
Dependent Claim
29 words
The method of claim 12 wherein the cross-linking agent is present in an amount of from 0.5 to 20 percent by weight based on the weight of the organopolysiloxane.
Claim 15
Dependent Claim
14 words
The bonded composite which is obtained in accordance with the method of claim 10.
Claim 16
Dependent Claim
14 words
The bonded composite which is obtained in accordance with the method of claim 12.
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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) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |