US4337348A
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Benzoin group-containing cyclic organopolysiloxanes and a method for the preparation thereof
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1981-06-17
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Granted: 1982-06-29
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Expires: 2001-06-17
Abstract
Abstract The invention provides a benzoin group-containing cyclic organopolysiloxane, which belongs to a novel class of organosilicon compounds hitherto not known or not described in any prior art literatures. The compound has at least one benzoin group of the formula <IMAGE> in which Ph is a phenyl group and R1 is a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms or, in particular, a methyl group, directly bonded to the silicon atom in the cyclic tri-, tetra-, penta- or hexasiloxane. The compound is useful as a sensitizer for the crosslinking reaction of a photo- or radiation-curable organopolysiloxane composition owing to the high miscibility of the inventive compounds with the organopolysiloxane composition.
Inventors
- 👤 Minoru Takamizawa
- 👤 Fumio Okada
- 👤 Hisashi Aoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:22
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/045; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0838; C07F7/0872; C07F7/0876; C07F7/21; C08F; C08F2/00; C08F2/46; C08F2/48; C08F2/50
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
A benzoin group-containing cyclic organopolysiloxane represented by the general structural formula ##STR13## in which R is a substituted or unsubstituted monovalent hydrocarbon group, A is a benzoin group expressed by the formula ##STR14## Ph being a phenyl group and R 1 being a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, m is zero or a positive integer and n is a positive integer with the proviso that m+n is 3, 4, 5 or 6.
Claim 2
Dependent Claim
80 words
A benzoin group-containing cyclic organopolysiloxane represented by the general structural formula ##STR13## in which R is a substituted or unsubstituted monovalent hydrocarbon group, A is a benzoin group expressed by the formula ##STR14## Ph being a phenyl group and R 1 being a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, m is zero or a positive integer and n is a positive integer with the proviso that m+n is 3, 4, 5 or 6.
Claim 3
Dependent Claim
21 words
The benzoin group-containing cyclic organopolysiloxane as claimed in claim 1 wherein R 1 is a hydrogen atom or a methyl group.
Claim 4
Dependent Claim
22 words
The benzoin group-containing cyclic organopolysiloxane as claimed in claim 1 wherein m+n is 4 or 5 and n is 1 or 2.
Claim 5
Dependent Claim
16 words
The benzoin group-containing cyclic organopolysiloxane as claimed in claim 1 wherein R is a methyl group.
Claim 6
Independent Claim
166 words
A method for the preparation of a benzoin group-containing cyclic organopolysiloxane represented by the general structural formula ##STR15## in which R is a substituted or unsubstituted monovalent hydrocarbon group, A is a benzoin group expressed by the formula ##STR16## Ph being a phenyl group and R 1 being a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, m is zero or a positive integer and n is a positive integer with the proviso that m+n is 3, 4, 5 or 6, which comprises reacting a benzoin compound of the formula AH, in which A has the same meaning as defined above, with a functional cyclic organopolysiloxane represented by the general structural formula ##STR17## in which R, m and n each have the same meaning as defined above and X is a hydrogen atom, a halogen atom, a hydroxy group or an alkoxy group having from 1 to 4 carbon atoms, in an organic solvent in the presence of a reaction-promoting agent.
Claim 7
Independent Claim
166 words
A method for the preparation of a benzoin group-containing cyclic organopolysiloxane represented by the general structural formula ##STR15## in which R is a substituted or unsubstituted monovalent hydrocarbon group, A is a benzoin group expressed by the formula ##STR16## Ph being a phenyl group and R 1 being a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, m is zero or a positive integer and n is a positive integer with the proviso that m+n is 3, 4, 5 or 6, which comprises reacting a benzoin compound of the formula AH, in which A has the same meaning as defined above, with a functional cyclic organopolysiloxane represented by the general structural formula ##STR17## in which R, m and n each have the same meaning as defined above and X is a hydrogen atom, a halogen atom, a hydroxy group or an alkoxy group having from 1 to 4 carbon atoms, in an organic solvent in the presence of a reaction-promoting agent.
Claim 8
Dependent Claim
34 words
The method as claimed in claim 5 wherein X is a hydrogen atom and the reaction-promoting agent is selected from the class consisting of zinc dust, sodium methylate, dibutyltin dilaurate, hydroxylamine and chloroplatinic acid.
Claim 9
Dependent Claim
35 words
The method as claimed in claim 5 wherein X is a halogen atom and the reaction-promoting agent is an acid acceptor selected from the class consisting of triethylamine, pyridine, dimethylaniline, urea and a derivative thereof.
Claim 10
Dependent Claim
26 words
The method as claimed in claim 5 wherein X is an alkoxy group and the reaction-promoting agent is tin dioctoate or an ester of titanic acid.
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) | 1985-06-28 | 1985-12-28 | 1986-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-28 | 1989-12-28 | 1990-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-28 | 1993-12-28 | 1994-06-29 | $7700.00 | Window Closed / Lapsed |