| 摘要 |
1,178,188. Hydrophilic plastic sheets. O. H. DRAGER, [trading as DRAGERWERK, HEINR. & BERNH. DRAGER]. 31 Aug., 1967 [31 Aug., 1966], No. 39975/67. Addition to 1,136,014. Heading C3F. A transparent window of acetyl or butyl cellulose contains as plasticizer vinyl sulphonic acid ethyl ester. This ester hydrolyses in contact with water to produce a wetting agent, whereby the surface of the window is rendered hydrophilic. The window is made by sintering or solution casting. |
