US4260726A
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Thermosetting organopolysiloxane compositions
Assignee: Wacker Chemie AG
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Filing: 1979-05-18
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Granted: 1981-04-07
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Expires: 1999-05-18
Abstract
Abstract Organopolysiloxane compositions which are stable at room temperature, but are curable when subjected to elevated temperatures comprising (1) an organosilicon compound containing Si-bonded hydrogen, (2) an organosilicon compound containing aliphatic multiple bonds, (3) a catalyst capable of promoting the addition of Si-bonded hydrogen to the aliphatic multiple bonds and (4) an organic compound as an additive containing at least one group of the formula ##STR1## in which the additive inhibits curing at room temperature.
Inventors
- 👤 Bernward Deubzer
- 👤 Erich Brunner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:21
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/39; C08K5/40; C08K5/43; C08K5/44; C08K5/45; C08K5/46; C08K5/47
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
109 words
A thermosetting organopolysiloxane composition comprising (1) an organosilicon compound having on the average at least two Si-bonded hydrogen atoms per molecule (2) an organosilicon compound containing on the average at least two monovalent hydrocarbon radicals per molecule having aliphatic multiple bonds, (3) a catalyst which promotes the addition of Si-bonded hydrogen to the aliphatic multiple bonds and (4) an organic compound which inhibits curing at room temperature selected from the group consisting of 2-mercaptobenzothiazole, zinc benzothiazylsulfide, dibenzothiazyl disulfide, benzothiazyl-2-N,N-diethylsulfenamide, benzothiazyl-2-N-cyclohexylsulfenamide, benzothiazyl-2-N,N-diisopropylsulfenamide, dithiocarbamic acid, N,N-dimethyldithiocarbamic acid, piperidine-N-pentamethylenedithiocarbamate, zinc-N,N-dibenzyldithiocarbamate, bismuth-N,N-dimethyldithiocarbamate, tellurium-N,N-diethyldithiocarbamate, zinc-N,N-di-n-butyldithiocarbamate, zinc-N,N-dimethyldithiocarbamate, lead di-N,N-methyldithiocarbamate, N,N-tetramethyldithiocarbamylsulfenamide, dithiocarbamylsulfenamide, tetramethylthiuram monosulfide, tetra-n-octadecylthiuram monosulfide, di-N-pentamethylenethiuram monosulfide, tetramethylthiuram disulfide, tetra-n-butylthiuram disulfide and di-N-pentamethylene thiuram tetrasulfide.
Claim 2
Dependent Claim
109 words
A thermosetting organopolysiloxane composition comprising (1) an organosilicon compound having on the average at least two Si-bonded hydrogen atoms per molecule (2) an organosilicon compound containing on the average at least two monovalent hydrocarbon radicals per molecule having aliphatic multiple bonds, (3) a catalyst which promotes the addition of Si-bonded hydrogen to the aliphatic multiple bonds and (4) an organic compound which inhibits curing at room temperature selected from the group consisting of 2-mercaptobenzothiazole, zinc benzothiazylsulfide, dibenzothiazyl disulfide, benzothiazyl-2-N,N-diethylsulfenamide, benzothiazyl-2-N-cyclohexylsulfenamide, benzothiazyl-2-N,N-diisopropylsulfenamide, dithiocarbamic acid, N,N-dimethyldithiocarbamic acid, piperidine-N-pentamethylenedithiocarbamate, zinc-N,N-dibenzyldithiocarbamate, bismuth-N,N-dimethyldithiocarbamate, tellurium-N,N-diethyldithiocarbamate, zinc-N,N-di-n-butyldithiocarbamate, zinc-N,N-dimethyldithiocarbamate, lead di-N,N-methyldithiocarbamate, N,N-tetramethyldithiocarbamylsulfenamide, dithiocarbamylsulfenamide, tetramethylthiuram monosulfide, tetra-n-octadecylthiuram monosulfide, di-N-pentamethylenethiuram monosulfide, tetramethylthiuram disulfide, tetra-n-butylthiuram disulfide and di-N-pentamethylene thiuram tetrasulfide.
Claim 3
Dependent Claim
74 words
The composition of claim 1, wherein the organosilicon compound (1) has units of the formula R.sub.m SiO.sub.(4-m)/2, where R is selected from the group consisting of hydrogen, monovalent hydrocarbon radicals and substituted monovalent hydrocarbon radicals, in which an average of at least two Si-bonded hydrogen atoms are present per molecule, m is 0, 1, 2 or 3 and on the average the units contain at least as many organic radicals as Si-bonded hydrogen atoms.
Claim 4
Dependent Claim
77 words
The composition of claims 1 or 2, wherein the organosilicon compound (2) has units of the formula R.sup.1.sub.m' SiO.sub.(4-m')/2 where R 1 is selected from the group consisting of monovalent hydrocarbon radicals and substituted monovalent hydrocarbon radicals, in which on the average at least two of the R 1 radicals and no more than 50 percent of the number of R 1 radicals per molecule have aliphatic multiple bonds and m' is 0, 1, 2 or 3.
Claim 5
Dependent Claim
14 words
The composition of claims 1 or 2, wherein the catalyst is a platinum catalyst.
References Cited (Backward Citations)
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