US4208312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curable organopolysiloxane compositions
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1978-09-27
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Granted: 1980-06-17
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Expires: 1998-09-27
Abstract
Abstract Organopolysiloxane compositions are provided which are curable by condensation reaction taking place between a first component, hydroxy-terminated diorganopolysiloxane and a second component, organohydrogenpolysiloxane by aid of a third component, a condensation catalyst, and which are made to have their pot life extended by adding a fourth component, acyloxysilane, optionally in combination with a carboxylic acid, as a condensation retarder. The addition of the retarder does not adversely effect the curing velocity of the composition even at an elevated temperature and the properties of the cured composition.
Inventors
- 👤 Fumio Okada
- 👤 Hirofumi Kishita
- 👤 Naomi Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:25
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08K; C08K5/00; C08K5/0008; C08K5/0025; C08K5/04; C08K5/09; C08K5/54; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/14; C08G77/16; C08G77/18; C08G77/20; C08G77/70; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
161 words
A curable organopolysiloxane composition consisting essentially of (a) 100 parts by weight of a diorganopolysiloxane terminated at both chain ends with hydroxy groups directly bonded to the silicon atoms, (b) from 0.1 to 50 parts by weight of an organohydrogenpolysiloxane having, in a molecule, at least three hydrogen atoms directly bonded to the silicon atoms, (c) from 1 to 20 parts by weight of a catalyst for condensation reaction, (d) from 5 to 80% by weight, based on the amount of the component (c) above, of an acyloxysilane represented by the general formula R.sub.3.sup.1 SiOCOR.sup.2 where R 1 and R 2 are each a monovalent hydrocarbon or halogenated hydrocarbon group having 1 to 18 carbon atoms, and (e) from zero to 50% by weight, based on the amount of the component (c) above, of a carboxylic acid represented by the general formula R.sup.3 COOH where R 3 is a monovalent hydrocarbon or halogenated hydrocarbon group having 1 to 6 carbon atoms.
Claim 2
Dependent Claim
161 words
A curable organopolysiloxane composition consisting essentially of (a) 100 parts by weight of a diorganopolysiloxane terminated at both chain ends with hydroxy groups directly bonded to the silicon atoms, (b) from 0.1 to 50 parts by weight of an organohydrogenpolysiloxane having, in a molecule, at least three hydrogen atoms directly bonded to the silicon atoms, (c) from 1 to 20 parts by weight of a catalyst for condensation reaction, (d) from 5 to 80% by weight, based on the amount of the component (c) above, of an acyloxysilane represented by the general formula R.sub.3.sup.1 SiOCOR.sup.2 where R 1 and R 2 are each a monovalent hydrocarbon or halogenated hydrocarbon group having 1 to 18 carbon atoms, and (e) from zero to 50% by weight, based on the amount of the component (c) above, of a carboxylic acid represented by the general formula R.sup.3 COOH where R 3 is a monovalent hydrocarbon or halogenated hydrocarbon group having 1 to 6 carbon atoms.
Claim 3
Dependent Claim
36 words
The curable organopolysiloxane composition as claimed in claim 1 wherein the amount of the component (b) is in the range from 0.5 to 20 parts by weight per 100 parts by weight of the component (a).
Claim 4
Dependent Claim
25 words
The curable organopolysiloxane composition as claimed in claim 1 wherein the component (d) is selected from the class consisting of trimethylacetoxysilane, dimethylvinylacetoxysilane, trimethylbutanoyloxysilane and dimethylphenylacetoxysilane.
Claim 5
Dependent Claim
35 words
The curable organopolysiloxane composition as claimed in claim 1 wherein the component (e) is selected from the class consisting of acetic acid, propionic acid, n-butyric acid, benzoic acid, trichloroacetic acid, dichloroacetic acid and trifluoroacetic acid.
Claim 6
Dependent Claim
23 words
The curable organopolysiloxane composition as claimed in claim 1 which is dispersed in an aqueous medium in the form of an aqueous emulsion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-17 | 1983-12-17 | 1984-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-17 | 1987-12-17 | 1988-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-17 | 1991-12-17 | 1992-06-17 | $7700.00 | Window Closed / Lapsed |