US4591608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultraviolet-curable organopolysiloxane composition
Assignee: Shin-Etsu Chemical Co Ltd
•
Filing: 1984-11-15
•
Granted: 1986-05-27
•
Expires: 2004-11-15
Abstract
Abstract The organopolysiloxane composition provided by the invention is very efficiently curable into a rubbery elastomer by the irradiation with ultraviolet light in the wave length region of even 300 nm or longer. The composition comprises (a) 100 parts by weight of a linear diorganopolysiloxane terminated at both molecular chain ends each with a di- or trivinylsilyl group, (b) 0.1 to 10 parts by weight of an organic peroxide and (c) 0.1 to 5 parts by weight of an aromatic ketone compound, e.g. benzophenone, which serves as a photosensitizer for the ultraviolet-induced curing.
Inventors
- 👤 Hiroshige Okinoshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:49
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/07; C08K5/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
131 words
An organopolysiloxane composition curable by irradiation with ultraviolet light which comprises: (a) 100 parts by weight of an organopolysiloxane having a substantially linear molecular chain structure and containing ethylenically unsaturated monovalent hydrocarbon groups at least at both molecular chain ends as represented by the general formula ##STR3## in which R 1 is a substituted or unsubstituted monovalent hydrocarbon group having no aliphatic unsaturation, R 2 is a substituted or unsubstituted monovalent hydrocarbon group, the suffix m is zero or a positive integer not exceeding 4, a is 1, 2 or 3 and n is zero or a positive integer not exceeding 10,000; (b) from 0.1 to 10 parts by weight of an organic peroxide; and (c) from 0.1 to 5 parts by weight of an aromatic ketone compound as a photosensitizer.
Claim 2
Dependent Claim
131 words
An organopolysiloxane composition curable by irradiation with ultraviolet light which comprises: (a) 100 parts by weight of an organopolysiloxane having a substantially linear molecular chain structure and containing ethylenically unsaturated monovalent hydrocarbon groups at least at both molecular chain ends as represented by the general formula ##STR3## in which R 1 is a substituted or unsubstituted monovalent hydrocarbon group having no aliphatic unsaturation, R 2 is a substituted or unsubstituted monovalent hydrocarbon group, the suffix m is zero or a positive integer not exceeding 4, a is 1, 2 or 3 and n is zero or a positive integer not exceeding 10,000; (b) from 0.1 to 10 parts by weight of an organic peroxide; and (c) from 0.1 to 5 parts by weight of an aromatic ketone compound as a photosensitizer.
Claim 3
Dependent Claim
14 words
The organopolysiloxane composition as claimed in claim 1 wherein the suffix m is zero.
Claim 4
Dependent Claim
16 words
The organopolysiloxane composition as claimed in claim 1 wherein the suffix a is 2 or 3.
Claim 5
Dependent Claim
20 words
The organopolysiloxane composition as claimed in claim 1 wherein the suffix n is in the range from 50 to 1000.
Claim 6
Dependent Claim
49 words
The organopolysiloxane composition as claimed in claim 1 wherein the aromatic ketone compound as the component (c) is selected from the class consisting of acetophenone, propiophenone, benzophenone, 4,4'-bis(dimethylamino) benzophenone, benzaldehyde, 3- and 4-methylacetophenones, 3- and 4-pentylacetophenones, 3- and 4-methoxybenzophenones, 3- and 4-methylbenzophenones, 3- and 4-chlorobenzophenones, 4,4'-dimethoxybenzophenone and 4-chloro-4'-benzyl benzophenone.
Claim 7
Dependent Claim
19 words
The organopolysiloxane composition as claimed in claim 5 wherein the aromatic ketone compound as the component (c) is benzophenone.
Claim 8
Dependent Claim
21 words
The organopolysiloxane composition as claimed in claim 1 wherein the monovalent hydrocarbon group denoted by R 2 is a methyl group.
References Cited (Backward Citations)
US4364809A
Cited
US4306042A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-26 | 1989-11-25 | 1990-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-26 | 1993-11-25 | 1994-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-26 | 1997-11-25 | 1998-05-27 | $7700.00 | Window Closed / Lapsed |