http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-980108-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c72d118f5664072de841f9c5c34b9d99 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G77-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G77-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07F7-0838 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G77-26 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07F7-21 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G77-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G77-26 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G77-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07F7-21 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07F7-08 |
| filingDate | 1962-12-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1965-01-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-980108-A |
| titleOfInvention | Nitrile-containing polysiloxanes |
| abstract | The invention comprises compounds of the formula <FORM:0980108/C3/1> where n and a are each 0 or 1, R is a monovalent hydrocarbon or halogenated hydrocarbon radical, and R1 is an alkylene or arylene group. They are prepared by the reaction of tetraphenyl disiloxane diol-1,3 or hexaphenyl trisiloxane diol-1,5 with the appropriate nitrile-containing organo dihalosilane Ra(R1CN)2-aSiX2, where X is halogen in an inert solvent in the presence of a hydrogen halide acceptor, e.g. a tertiary amine, in particular pyridine. The hydrohalide precipitate is removed, then the solvent, and the product is recrystallized. Polymers containing the recurrent unit <FORM:0980108/C3/2> where n, a, R and R1 are as defined above, are prepared by heating the compounds (I) alone at 300-375 DEG C., or, preferably, with a catalyst at 110-170 DEG C. A suitable catalyst is a 0.01-1% solution of KOH in octamethyl cyclotetrasiloxane, amounting to 10-100 p.p.m. of KOH in the monomer. The polymers have M.W.'s of 10,000 to 5,000,000, and are soluble in benzene or toluene. In the same way copolymers can be made from mixtures of compounds (I) with themselves or other cyclic polysiloxanes or cyclic siloxane-silphenylenes, e.g. those of Specifications 980,101, 980,102, 980,103, 980,104, 980,105, 980,106, 980,107 and 980,109. Homopolymers of units (II) are best cross-linked by irradiation, e.g. with 50,000-20,000,000 eV electrons, and copolymers containing vinyl groups or adjacent methyl groups may be cured by irradiation or by conventional free radical (e.g. peroxide) curing agents. Fillers may be added before cure, if required, and may suitably be silica (aerogel, fumed, precipitated), glass fibres, TiO2, Fe2O3, Cr2O3, CaCO3, CaSiO3, CdS, lithopone, carbon black, asbestos, talc, &c. The examples describe the preparation and polymerization of 1-methyl-1 - b - cyanoethyl - 3,3,5,5 - tetraphenyl cyclotrisiloxane, 1 - methyl - 1 - m - cyanophenyl - hexaphenyl cyclotetrasiloxane and 1,1-bis-(b - cyanoethyl) 3,3,5,5 - tetraphenyl cyclotrisiloxane, and the preparation of g -cyano-propyl - heptaphenyl cyclotetrasiloxane and its copolymerization with hexaphenyl cyclotrisiloxane, and the cure of the polymers by irradiation. |
| priorityDate | 1961-12-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
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