| 摘要 |
Process, and the article produced thereby, for providing a hard, acetone-resistant and mar-resistant coating on articles having a polysulfone surface by applying to the surface a solvent-soluble, further curable organopolysiloxane in an organic solvent and thereafter evaporating the solvent and finally curing the organopolysiloxane. The solvent-soluble, further curable organopolysiloxane is made by heating methyltrialkoxysilane or a mixture of methyltrialkoxysilane and phenyltrialkoxysilane and water in the presence of a hydrolysis catalyst at a sufficient temperature and for a suitable time to form a partial condensation product, concentrating this product by heating it to remove some alkanol byproduct and water and thereafter heating the product below the gel point thereof to provide the solvent soluble, further curable organopolysiloxane.
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