US4735971A
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Room temperature-curable organopolysiloxane composition
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1987-02-09
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Granted: 1988-04-05
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Expires: 2007-02-09
Abstract
Abstract The inventive organopolysiloxane composition is curable in two ways, firstly, by the irradiation with ultraviolet light and, secondly, by exposure to a moisture-containing atmospheric air. The principal ingredient of the composition is a diorganopolysiloxane having, in a molecule, at least one isopropenyloxysilyl-substituted ethyl or propyl group bonded to the silicon atom of the polysiloxane chain, which is compounded with a mercaptoalkyl-containing organopolysiloxane, a photosensitizer and, optionally, a curing catalyst for the dealcoholation condensation reaction of the silicon-bonded alkoxy groups under the influence of atmospheric moisture. The composition is advantageous in the improved workability by virtue of the adequate tack-free time or the time taken for surface filming.
Inventors
- 👤 Yoshio Inoue
- 👤 Masatoshi Arai
- 👤 Shinichi Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:05
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
132 words
A curable organopolysiloxane composition which comprises: (A) 100 parts by weight of an organopolysiloxane having, in a molecule, at least one isopropenyloxy silyl-substituted ethyl or propyl group represented by the general formula --(--CH.sub.2 --).sub.a --Si(--O--CMe═CH.sub.2).sub.b (--OR).sub.c (Me).sub.d, in which Me denotes a methyl group, R denotes a monovalent saturated hydrocarbon group, a is 2 or 3, b is 1, 2 or 3 and c and d are each zero, 1 or 2 with the proviso that b+c+d is equal to 3; (B) a mercapto-containing organopolysiloxane having, in a molecule, at least two mercapto groups in such an amount as to provide from 0.1 to 20 moles of the mercapto groups per mole of the isopropenyloxy groups in the component (A); and (C) from 0.01 to 10 parts by weight of a photosensitizer.
Claim 2
Dependent Claim
132 words
A curable organopolysiloxane composition which comprises: (A) 100 parts by weight of an organopolysiloxane having, in a molecule, at least one isopropenyloxy silyl-substituted ethyl or propyl group represented by the general formula --(--CH.sub.2 --).sub.a --Si(--O--CMe═CH.sub.2).sub.b (--OR).sub.c (Me).sub.d, in which Me denotes a methyl group, R denotes a monovalent saturated hydrocarbon group, a is 2 or 3, b is 1, 2 or 3 and c and d are each zero, 1 or 2 with the proviso that b+c+d is equal to 3; (B) a mercapto-containing organopolysiloxane having, in a molecule, at least two mercapto groups in such an amount as to provide from 0.1 to 20 moles of the mercapto groups per mole of the isopropenyloxy groups in the component (A); and (C) from 0.01 to 10 parts by weight of a photosensitizer.
Claim 3
Dependent Claim
33 words
The curable organopolysiloxane composition as claimed in claim 1 which further comprises a curing catalyst in an amount not exceeding 10 parts by weight per 100 parts by weight of the component (A).
Claim 4
Dependent Claim
33 words
The curable organopolysiloxane composition as claimed in claim 1 wherein the photosensitizer as the component (C) is a compound selected from the class consisting of benzophenone, di(ethoxy)methyl phenyl ketone and 2-hydroxycyclohexyl phenyl ketone.
Claim 5
Dependent Claim
61 words
The curable organopolysiloxane composition as claimed in claim 1 wherein the photosensitizer is acetophenone, propiophenone, xanthone, fluorene, benzaldehyde, anthraquinone, triphenyl amine, carbazole, 3-methyl acetophenone, 4-methyl acetophenone, 3-pentyl acetophenone, 4-methoxy acetophenone, 3-bromoacetophenone, 4-allyl acetophenone, 1,4-diacetyl benzene, 3-methoxy benzophenone, 4-methyl benzophenone, 4-chlorobenzophenone, 4,4'-dimethoxy benzophenone, 4-chloro-4'-benzyl benzophenone, 3-chloroxanthone, 3,9-dichloroxanthone, 3-chloro-8-nonyl xanthone, benzoin, benzoin methyl ether, benzoin butyl ether, bis(4-dimethylaminophenyl)ketone, benzyl methoxy keta or 2-chlorothioxanthone.
Claim 6
Dependent Claim
87 words
The curable organopolysiloxane composition as claimed in claim 2 wherein the curing catalyst is lead 2-ethylhexoate, dibutyl tin diacetate, dibutyl tin dilaurate, butyl tin tri-2-ethylhexoate, iron 2-ethylhexoate, cobalt 2-ethylhexoate, manganese 2-ethylhexoate, zinc 2-ethylhexoate, tin (II) caprylate, tin naphthenate, tin oleate, tin butyrate, titanium naphthenate, zinc naphthenate, cobalt naphthenate and zinc stearate, tetrabutyl titanate, tetra(2-ethylhexyl)titanate, triethanolamine titanate, tetra(isopropenyloxy)titanate, 3-aminopropyl triethoxy silane, N-(trimethoxysilylpropyl)ethylenediamine, hexyl amine dodecylamine phosphate, benzyl triethyl ammonium acetate, potassium acetate, sodium acetate, lithium oxalate, dimethyl hydroxylamine, diethyl hydroxylamine, guanidine, tetramethyl guanidine, 3-tetramethylguanidinopropyl trimethoxy silane or 1,1,1,3,5,7,7,7,-octamethyl-3,5-di(3-tetramethylguanidinopropyl)tetrasiloxane.
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) | 1991-04-05 | 1991-10-05 | 1992-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-05 | 1995-10-05 | 1996-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-05 | 1999-10-05 | 2000-04-05 | $7700.00 | Window Closed / Lapsed |