| 摘要 |
<p>A coating composition comprises (1) 1 part by weight of a curable methylpolysiloxane, and (2) 1 to 10 parts by weight of a co-polymer of (a) vinyl pyrrolidone and (b) at least one monomer selected from styrene, vinyl acetate and alkyl esters of acrylic acid, the ratio of (a) and (b) in (2) being from 10:90 to 90:10 by weight. Methylpolysiloxanes exemplified are hydroxylated dimethyl polysiloxane; methyl hydrogen polysiloxane; and mixtures of the above; a copolymer of dimethyl siloxane, trimethyl siloxane and HSiO3/2; and a copolymer of dimethyl siloxane and monomethyl siloxane. The methyl polysiloxanes are cured by incorporating catalysts e.g. alkyl titanates or metal salts of carboxylic acids in the composition. Vinyl pyrrolidone copolymers exemplified are those with styrene, vinyl acetate, ethyl acrylate and octyl acrylate.ALSO:Fabrics, e.g. paper, cotton, wool, silk, rayon, synthetic fabrics and glass fabrics are coated with a water repellent coating composition comprising (1) 1 part by weight of a curable methylpolysiloxane and (2) 1 to 10 parts by weight of a copolymer of (a) vinyl pyrrolidone and (6) at least one material selected from styrene, vinyl acetate and alkyl esters of acrylic acid, the ratio of (a) and (6) in (2) being from 10:90 to 90:10 by weight (see Division C3). The compositions may be applied by dipping coating spraying and padding. After application the fabric is dried in the conventional manner.</p> |
