Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1994-10-21
1998-02-17
Glass, Margaret W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
528 29, 528 31, 556445, 522 99, C08G 7708
Patent
active
057192480
DESCRIPTION:
BRIEF SUMMARY
The invention relates to siloxane copolymers containing vinyloxy groups and to a process for their preparation. The invention furthermore relates to compositions which can be crosslinked by light and are based on siloxane copolymers containing vinyloxy groups.
Organopolysiloxanes which contain, per molecule, at least one Si-bonded vinyloxy-functional group of the formula interrupted by at least one divalent hetero radical, such as --O--, a divalent phonylone radical or a substituted divalent phenylene radical, or combinations of such hereto radicals, are known from EP-B 105 341. These organopolysiloxanes are obtained by preparation of a compound having an allyl and a vinyloxy group and addition of this compound onto the SiH groups of the organopolysiloxanes, hydrosilylation taking place only on the allyl group. EP-B 105 341 furthermore describes compositions which can be crosslinked by light and comprise the abovementioned organopolysiloxanes, and also onium salts which catalyse the cationic polymerisation of these organopolysiloxanes.
A silane which has one vinyloxypropyl group and at least one trimethylsiloxy group and which is obtained by hydrosilylation of allyl vinyl ether with a silane containing trimethyisiloxy groups, addition taking place on the allyl group, is known for the production of plastic lenses from Chemical Abstracts 107, 176221q. copolymers which contain propenyloxy groups are described in U.S. Pat. No. 5,057,549 and CA-A 20.35 396, these compounds being prepared in a two-stage process by addition of compounds having two or more than two allyloxy groups onto SiH groups of organopolysiloxanes and subsequent conversion of the allyloxy groups into the propenyloxy groups by addition on the double bond.
Siloxane copolymers which are obtained by reaction of hydrocarbons having more than two terminal double bonds, such as 1,2,4-trivinylcyclohexane, with organopolysiloxanes containing Si-bonded hydrogen atoms in the presence of catalysts which promote hydrosilylation are described in the German Patent Application of the Applicant Company having the application number P 41 23 423.5.
Organopolysiloxanes which have any number of substituted vinyl ether groups and are prepared by hydrosilylation, that is to say by reaction of an organopolysiloxane containing SiH groups with a polyoxyalkylene ether, for example of the formula ##STR1## addition taking place on the allyl group, are known from U.S. Pat. No. 5,145,915.
There was the object of providing siloxane copolymers which contain vinyloxy groups and can be prepared in a simple process, the process allowing more than one vinyloxy group to be introduced on one silicon atom and the process also enabling polyvinyloxy polymers to be obtained when divinyl ethers are employed. There was furthermore the object of providing siloxane copolymers which contain vinyloxy groups and crosslink particularly rapidly under the action of light, in particular ultraviolet light, with cationic polymerisation. This object is achieved by the invention.
The invention relates to siloxane copolymers containing vinyloxy groups and comprising ##STR2## wherein R denotes identical or different, optionally halogenated hydrocarbon radicals having 1 to 18 carbon atom(s) per radical, atom(s) per radical, which can be substituted by an ether oxygen atom, of the formula ##STR3## wherein R has the meaning given above for this radical, c is 0, 1 or 2, to 20 carbon atoms per radical, atom(s) per radical) tert-butyl or phenyl radical) ##STR4## (wherein R.sup.3 has the meaning given above for this radical) or --X (wherein X denotes a halogen atom) or can be interrupted by at least one oxygen atom, one carboxyl or one carbonyl group, and ##STR5## G.sup.2 denotes a radical of the formula ##STR6## G.sup.3 denotes a radical of the formula ##STR7## wherein Y and x have the meaning given above for these symbols, and ##STR8## wherein R and c have the meaning given above for these symbols and L denotes a radical of the formula ##STR9## wherein Z is a divalent, trivalent, tetravalent, pentavalent o
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Derwent Abstract 93-206310/26.
Herzig Christian
Rengstl Alfred
Glass Margaret W.
Wacker-Chemie GmbH
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