| 摘要 |
<p>Compositions and methods of making them are described and claimed which comprise a polymeric material having not less than two groups bonded to silicon which are hydroxyl or hydrolysable groups, a silane cross-linking agent having at least two oximo groups which are reactive with said polymeric material in presence of moisture to release an oxime condensation by-product and a component effective to control emission of volatile oxime compounds from the composition as it cures. The component effective to control emission of volatile oxime compounds from the composition as it cures is preferably an organic isocyanate having at least one isocyanate group and is preferably present in a stoichiometric ratio with the proportion of condensation by-product to be evolved. The polymeric material is preferably according to the general formula X-A-X where A represents a polyoxyalkylene chain or a polydiorgano-siloxane chain and X represents a hydroxyl or hydrolysable group selected from -R"2SiOH, -R"Si(OR<5>)2, -Si(OR<5>)3, -R"2SiOR<5> or -R"2SiR" "SiR"p (OR<5>)3-p where R" represents an alkyl or fluoroalkyl group, and is preferably methyl, R"' is a divalent hydrocarbon group which may be interrupted by one or more siloxane spacers having up to six silicon atoms, R<5> represents an alkyl or oxyalkyl group in which the alkyl groups have up to 6 carbon atoms and p has the value 0, 1 or 2.</p> |
