EP0238033A2
Expired / Lapsed
EP
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A photocurable organopolysiloxane composition
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1987-03-17
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Granted: —
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Expires: 2007-03-17
Abstract
Abstract The photocurable organopolysiloxane composition comprises (A) a diorganopolysiloxane of which each of the terminal silicon atoms has 2 or 3 vinyl groups bonded thereto, (B) an organohydrogenpolysiloxane as a crosslinking agent, (C) a platinum compound as a catalyst for promoting the addition reaction between the vinyl groups in (A) and the silicon-bonded hydrogen atoms in (B), and (D) a photosensitzer. By virtue of the synergistic effect of the components, the composition is advantageous in the high sensitvity to photo-induced curing and stability.
Inventors
- 👤 Hisashi Aoki
- 👤 Yasuaki Hara
- 👤 Kiyohiro Kondow
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 23:46
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
172 words
A photocurable organopolysiloxane composition which comprises: (A) 100 parts by weight of a diorganopolysiloxane having a substantially linear molecular structure represented by the general formula in which each R is a monovalent hydrocarbon group having 1 to 12 carbon atoms, each R' is a monovalent hydrocarbon group having 1 to 6 carbon atoms and free from aliphatic unsaturation, the subscript a is 2 or 3 and n is a positive integer in the range from 20 to 2000; (B) from 0.1 to 50 parts by weight of an organohydrogenpolysiloxane having, in a molecule, at least two hydrogen atoms directly bonded to the silicon atoms, the amount being sufficient to provide from 0.1 to 10 moles of the hydrogen atoms directly bonded to the silicon atoms per mole of the vinyl groups in the component (A); (C) from 1 to 1000 ppm by weight as platinum of a platinum compound based on the total amount of the components (A) and (B); and (D) from 0.1 to 10 parts by weight of a photosensitizer.
Claim 2
Dependent Claim
172 words
A photocurable organopolysiloxane composition which comprises: (A) 100 parts by weight of a diorganopolysiloxane having a substantially linear molecular structure represented by the general formula in which each R is a monovalent hydrocarbon group having 1 to 12 carbon atoms, each R' is a monovalent hydrocarbon group having 1 to 6 carbon atoms and free from aliphatic unsaturation, the subscript a is 2 or 3 and n is a positive integer in the range from 20 to 2000; (B) from 0.1 to 50 parts by weight of an organohydrogenpolysiloxane having, in a molecule, at least two hydrogen atoms directly bonded to the silicon atoms, the amount being sufficient to provide from 0.1 to 10 moles of the hydrogen atoms directly bonded to the silicon atoms per mole of the vinyl groups in the component (A); (C) from 1 to 1000 ppm by weight as platinum of a platinum compound based on the total amount of the components (A) and (B); and (D) from 0.1 to 10 parts by weight of a photosensitizer.
Claim 3
Dependent Claim
38 words
The photocurable organopolysiloxane composition as claimed in claim 1 wherein the diorganopolysiloxane as the component (A) is represented by the general formula wherein R, R', a and n each have the same meaning as defined in claim 1.
Claim 4
Dependent Claim
31 words
The photocurable organopolysiloxane composition as claimed in claim 1 wherein the photosensitizer as the component (D) is a compound selected from the class consisting of 4-methoxy benzophenone, 2-hydroxy-2-methyl-1-phenyl propan-1-one and benzyl.
Claim 5
Dependent Claim
49 words
The photocurable organopolysiloxane composition as claimed in claim 1 which further comprises an acetylenic compound selected from the class consisting of 3,5-dimethyl-1-hexyn-3-ol, 3-methyi-1-butyn-3-oi, 3-methyt-3-penten-1-yne, 3-methyf-1-pentyn-3-ol and 5,5-dimethyl-3-hexen-1-yne in an amount in the range from 0.1 to 10 parts by weight per 100 parts by weight of the component (A).
Claim 6
Dependent Claim
27 words
The photocurable organopolysiloxane composition as claimed in claim 1 wherein the platinum compound as the component (C) is a complex of chloroplatinic acid and a vinyl siloxane.
References Cited (Backward Citations)
No citation records indexed.
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