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Vulcanizable organopolysiloxane composition

  • US 5,371,116 A
  • Filed: 07/13/1993
  • Issued: 12/06/1994
  • Est. Priority Date: 07/14/1992
  • Status: Expired due to Term
First Claim
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1. A vulcanizable organopolysiloxane composition which comprises:

  • (A) a hydroxy-terminated organopolysiloxane of the following general formula (1) ##STR12## wherein each R1 independently represents an unsubstituted or substituted monovalent organic group, and n is an integer of from 1 to 10,000;

    (B) an acrylic or methacrylic functional alkoxysilane of the following general formula (27) ##STR13## wherein R2 represents a hydrogen atom or a methyl group, R3 represents an unsubstituted or substituted divalent organic group, R4 and R5 independently represent an unsubstituted or substituted monovalent organic group, and a is a value of 0, 1 or 2;

    (C) a divalent tin compound of the following general formula (3)
    
    
    space="preserve" listing-type="equation">SnX.sub.2 (

         3)wherein each X independently E represents a halogen atom, an OR6 or an ##STR14## group in which R6 and R7 independently represent an unsubstituted or substituted monovalent organic group;

    (D) an alkoxy-α

    -silyl ester of the following general formula (4) ##STR15## wherein R8 and R9 independently represent a methyl group or an ethyl group, R10 and R11 independently represent a hydrogen atom or an unsubstituted or substituted monovalent organic group, R12 represents an unsubstituted or substituted monovalent organic group, and b is a value of 0, 1 or 2;

    (E) an effective amount of a photopolymerization initiator for photopolymerization of said alkoxysilane (B), said photopolymerization initiator being selected from the group consisting of acetophenone, propiophenone, benzophenone, xanthol, fluorene, benzaldehyde, anthraquinone, triphenylamine, 4-methylacetophenone, 3-pentylacetophenone, 4-methoxyacetophenone, 3-bromoacetophenone, 4-allylacetophenone, p-diacetylbenzene, 3-methoxybenzophenone, 4-methylbenzophenone, 4-chlorobenzophenone, 4,4-dimethoxybenzophenone, 4-chloro-4-benzylbenzophenone, 3-chloroxanthone, 3,9-dichloroxanthone, 3-chloro-8-nonylxanthone, benzoin, benzoin methyl ether, benzoin butyl ether, bis(4-dimethylaminophenyl)ketone, benzyl methoxyketal, 2-chloroxanthone, diethylacetophenone, 1-hydroxycyclohexyl phenyl ketone, 2-methyl[4-(methylthio)phenyl]2-morpholino-1-1-propanone, 2,2-dimethoxy-2-phenylacetophenone, and diethoxyacetophenone; and

    (F) an effective amount of a catalyst for vulcanization of said alkoxysilane (B) and said alkoxy-α

    -ester (D) whereby the composition is vulcanizable by the action of moisture in air at room temperature and/or by application of UV light, said catalyst for vulcanization being selected from the group consisting of dibutyltin diacetate, dibutyltin dioctoate, dibutyltin dilaurate, dibutyltin dioleate, diphenyltin diacetate, dibutyltin dioxide, dibutyltin dimethoxide, dibutylbis(triethoxysiloxy)tin, dibutyltinbenzyl maleate, tetraisopropoxy, titanium, tetra-n-butoxy titantium, tetrabis (2-ethylhexoxy) titanium, dipropoxybis (acetylacetona) titanium and titanium isopropoxyoctylene glycol.

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