US4487907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
RTV Polyorganosiloxane compositions yielding paintable elastomers
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1983-12-12
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Granted: 1984-12-11
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Expires: 2003-12-12
Abstract
Abstract Cured elastomers prepared by the reaction of a hydroxyl-terminated polyorganosiloxane with curing agents containing silicon-bonded aminoxy and/or amido groups can be painted when a dialkoxysilane of the formula X'R1SiR2(OR3)2 is present in the curable composition. In the foregoing formula R1 is alkylene, haloalkylene or oxyalkylene, R2 and R3 are individually hydrocarbon, alkoxy-hydrocarbon or halohydrocarbon radicals and X' is glycidoxy, mercapto, acryloxy, methacryloxy, NH2, -N(C2H5)2 or -N(H)CH2CH2NH2.
Inventors
- 👤 Miyoji Fukayama
- 👤 Chikara Ichijo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:40
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/54; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/16; Y; Y10; Y10S; Y10S528/00; Y10S528/901
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
167 words
A room temperature vulcanizable organosilicon composition which is stable under conditions excluding moisture and which cures in the presence of atmospheric moisture to form a silicone rubber having a paintable surface, said composition comprising the product obtained by mixing (A) 100 parts by weight of a hydroxyl-terminated polyorganosiloxane exhibiting a viscosity of from 0.02 to 1,000 Pa.s at 25° C.; (B) from 0.5 to 30 parts by weight of at least one organosilicon compound containing at least two silicon-bonded groups per molecule selected from the group consisting of amide, aminoxy and combinations thereof; and (C) from 0.05 to 15 parts by weight of a dialkoxysilane of the general formula XR 1 SiR 2 (OR 3 ) 2 or a partial hydrolysis condensation product thereof, where X represents a mercapto, acryloxy, methacryloxy, or epoxy group, R 1 represents an alkylene, haloalkylene or oxyalkylene radical, and R 2 and R 3 are individually selected from the group consisting of monovalent hydrocarbon radicals, monovalent alkoxyhydrocarbon radicals, and monovalent halohydrocarbon radicals.
Claim 2
Dependent Claim
167 words
A room temperature vulcanizable organosilicon composition which is stable under conditions excluding moisture and which cures in the presence of atmospheric moisture to form a silicone rubber having a paintable surface, said composition comprising the product obtained by mixing (A) 100 parts by weight of a hydroxyl-terminated polyorganosiloxane exhibiting a viscosity of from 0.02 to 1,000 Pa.s at 25° C.; (B) from 0.5 to 30 parts by weight of at least one organosilicon compound containing at least two silicon-bonded groups per molecule selected from the group consisting of amide, aminoxy and combinations thereof; and (C) from 0.05 to 15 parts by weight of a dialkoxysilane of the general formula XR 1 SiR 2 (OR 3 ) 2 or a partial hydrolysis condensation product thereof, where X represents a mercapto, acryloxy, methacryloxy, or epoxy group, R 1 represents an alkylene, haloalkylene or oxyalkylene radical, and R 2 and R 3 are individually selected from the group consisting of monovalent hydrocarbon radicals, monovalent alkoxyhydrocarbon radicals, and monovalent halohydrocarbon radicals.
Claim 3
Dependent Claim
15 words
A composition according to claim 1 where R 1 represents an alkylene or oxyalkylene radical.
Claim 4
Dependent Claim
22 words
A composition according to claim 2 where R 1 represents propylene, butylene or --CH 2 OCH 2 CH 2 CH 2 --.
Claim 5
Dependent Claim
14 words
A composition according to claim 1 where R 2 and R 3 are alkyl.
Claim 6
Dependent Claim
18 words
A composition according to claim 4 where R 2 is methyl and R 3 is methyl or ethyl.
Claim 7
Dependent Claim
21 words
A composition according to claim 1 where the concentration of said dialkoxysilane (C) is from 0.1 to 5 parts by weight.
Claim 8
Dependent Claim
20 words
A composition according to claim 1 where said dialkoxysilane is selected from the group consisting of γ-mercaptopropylmethyldimethoxysilane, γ-methacryloxypropylmethyldimethoxysilane and γ-glycidoxypropylmethyldimethoxysilane.
Claim 9
Dependent Claim
12 words
A composition according to claim 1 where said polyorganosiloxane is a polydiorganosiloxane.
Claim 10
Dependent Claim
24 words
A composition according to claim 8 where said polydiorganosiloxane is a polydimethylsiloxane exhibiting a viscosity of from 0.2 to 200 Pa.s at 25° C.
Claim 11
Dependent Claim
36 words
A composition according to claim 1 where said polyorganosiloxane (A) is a linear polydiorganosiloxane and said organosilicon compound (B) contains an average of more than two groups per molecule selected from amide, aminoxy and combinations thereof.
Claim 12
Dependent Claim
12 words
A composition according to claim 10 where said groups are aminoxy groups.
Claim 13
Dependent Claim
12 words
A composition according to claim 11 where said groups and N,N-diethylaminoxy groups.
Claim 14
Dependent Claim
10 words
A composition according to claim 1 which contains a filler.
Claim 15
Dependent Claim
13 words
A composition according to claim 13 which contains calcium carbonate as a filler.
References Cited (Backward Citations)
US4311737A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |