US4537691A
Expired / Lapsed
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Silicone-based working fluid composition
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1984-11-02
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Granted: 1985-08-27
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Expires: 2004-11-02
Abstract
Abstract The invention provides a silicone-based working fluid composition having improved heat resistance which comprises (A) 100 parts by weight of a base component composed of a first dimethylpolysiloxane terminated at both molecular chain ends each with a trimethylsiloxy group and a second dimethylpolysiloxane terminated at both molecular chain ends each with a silicon-bonded hydroxy group in such a proportion that the trimethylsiloxy/hydroxy molar ratio is from 95/5 to 10/90 and (B) from 0.01 to 5 parts by weight of an additive component which is a diorganopolysiloxane having imino-containing phenoxy groups, e.g. 4-anilinophenoxy group, 4-(4-anilino)anilinophenoxy group, 4-( alpha -naphthylamino)phenoxy group and 4-( beta -naphthylamino)phenoxy group, as the pendant groups on the polysiloxane.
Inventors
- 👤 Shigeru Mori
- 👤 Yoshiaki Kudo
- 👤 Satoshi Kuwata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:01
CPC Classifications
C; C10; C10M; C10M169/00; C10M169/04; C10M169/041; C08; C08L; C08L83/00; C08L83/04; C10M107/00; C10M107/50; C10M155/00; C10M155/02; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/16; C08G77/22; C08G77/26; C08G77/70; C10M2229/00; C10M2229/02; C10M2229/025; C10M2229/04; C10M2229/0405; C10M2229/041; C10M2229/0415; C10M2229/042; C10M2229/0425; C10M2229/043; C10M2229/0435; C10M2229/044; C10M2229/0445; C10M2229/045; C10M2229/0455; C10M2229/046; C10M2229/0465; C10M2229/047; C10M2229/0475; C10M2229/048; C10M2229/0485; C10M2229/05; C10M2229/0505; C10M2229/051; C10M2229/0515; C10M2229/052; C10M2229/0525; C10M2229/053; C10M2229/0535; C10M2229/054; C10M2229/0545; Y; Y10; Y10S; Y10S528/00; Y10S528/901
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
210 words
A silicone-based working fluid composition which comprises: (A) 100 parts by weight of a diorganopolysiloxane or a mixture of diorganopolysiloxanes each represented by the general formula R.sup.1 --SiR.sup.2.sub.2 -O).sub.m SiR.sup.2.sub.2 -R.sup.1, in which each R 1 is trihydrocarbylsiloxy group or a hydroxy group independently from the other, R 2 is an alkyl group or a phenyl group and m is a positive integer in the range from 20 to 2000, the groups denoted by R 1 in the overall component (A) being a combination of trihydrocarbylsiloxy groups and hydroxy groups in such a molar proportion of the former to the latter in the range from 95/5 to 10/90, and (B) from 0.01 to 5 parts by weight of an organopolysiloxane represented by the general formula R.sup.3 --SiR.sup.2.sub.2 -O).sub.n SiR.sup.2 -R.sup.3 or ##STR3## in which R 2 has the same meaning as defined above, R 3 is an imino-substituted phenoxy group selected from the class consisting of 4-anilinophenoxy group, 4-(4-anilino)anilinophenoxy group, 4-(α-naphthylamino)phenoxy group and 4-(β-naphthylamino)phenoxy group, n is a positive integer in the range from 1 to 50, q is a positive integer in the range from 1 to 10 and p is zero or a positive integer with the proviso that p+q is in the range from 1 to 48.
Claim 2
Dependent Claim
210 words
A silicone-based working fluid composition which comprises: (A) 100 parts by weight of a diorganopolysiloxane or a mixture of diorganopolysiloxanes each represented by the general formula R.sup.1 --SiR.sup.2.sub.2 -O).sub.m SiR.sup.2.sub.2 -R.sup.1, in which each R 1 is trihydrocarbylsiloxy group or a hydroxy group independently from the other, R 2 is an alkyl group or a phenyl group and m is a positive integer in the range from 20 to 2000, the groups denoted by R 1 in the overall component (A) being a combination of trihydrocarbylsiloxy groups and hydroxy groups in such a molar proportion of the former to the latter in the range from 95/5 to 10/90, and (B) from 0.01 to 5 parts by weight of an organopolysiloxane represented by the general formula R.sup.3 --SiR.sup.2.sub.2 -O).sub.n SiR.sup.2 -R.sup.3 or ##STR3## in which R 2 has the same meaning as defined above, R 3 is an imino-substituted phenoxy group selected from the class consisting of 4-anilinophenoxy group, 4-(4-anilino)anilinophenoxy group, 4-(α-naphthylamino)phenoxy group and 4-(β-naphthylamino)phenoxy group, n is a positive integer in the range from 1 to 50, q is a positive integer in the range from 1 to 10 and p is zero or a positive integer with the proviso that p+q is in the range from 1 to 48.
Claim 3
Dependent Claim
26 words
The silicone-based working fluid composition as claimed in claim 1 wherein at least 50% by moles of the groups denoted by R 2 are methyl groups.
Claim 4
Dependent Claim
47 words
The silicone-based working fluid composition as claimed in claim 1 wherein the component (A) is a mixture of a first dimethylpolysiloxane terminated at both molecular chain ends each with a trimethylsiloxy group and a second dimethylpolysiloxane terminated at both molecular chain ends each with a dimethylhydroxysiloxy group.
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) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |