Patent ID: 6100367
Filing Date: 2000-08-08
Classification: C08G,C09D

Abstract:
A method of preparing a coating agent, the method comprising the steps of:(I) reacting (A) a polymer having at least two organic groups containing carbon-carbon unsaturated bonds with (B) an alkoxysilane containing a silicon-bonded hydrogen atom in an organic solvent and in the presence of a hydrosilylation catalyst to produce a solution containing an alkoxysilyl-functional polymer, wherein component (A) has a number-average molecular weight of 500 to 100,000 and has a principal chain comprising a polycarbonate or a polyarylate; and the alkoxysilane is an alkoxysilane having the formula:H--SiR.sup.3.sub.3-a (OR.sup.4).sub.aor a partial hydrolyzate thereof, wherein R.sup.3 is a monovalent hydrocarbon group having 1 to 10 carbon atoms, R.sup.4 is a monovalent hydrocarbon group having 1 to 8 carbon atoms, and a is from 1 to 3;(II) adding an adsorbing agent to the solution; wherein the absorbing agent is selected from the group consisting of active carbon, silica, silica gel, glass beads, and silane-treated absorbing agents formed therefrom to form a mixture; and(III) separating the absorbing agent from the mixture to produce a coating agent containing not more than 1 part per million of the hydrosilylation catalyst.