| abstract |
The condensation reaction curable composition is a new catalyst, Dow Corning® 4-6085; And a polyorganosiloxane polyoxyalkylene block air having at least one polyorganosiloxane block and at least one polyoxyalkylene block, connected to each other via divalent radicals, comprising at least two silicon-bonded alkoxy groups. Wherein the polyorganosiloxane polyoxyalkylene block copolymer is preferably PS-(A-PO) m- (A-PS) n where PO is a polyoxyalkylene block and PS is Represents a polyorganosiloxane block, A is a divalent radical, the subscripts m and n independently have a value of at least 1), and are of formula (R ') q (OR) -SiO 3-q / 2 ( Wherein R represents an alkyl group having 1 to 4 carbon atoms, each R 'represents an alkyl group having 1 to 6 carbon atoms, a phenyl group, or an alkoxy group of the formula -OR, and the subscript q is 0, At least one alkoxy value Comprising the siloxane units, with the proviso that at least two silicon-bonded OR groups are present in the block copolymer. Also provided is a hydrophilic polymer network prepared by curing the composition in the presence of moisture. |