| 摘要 |
1498634 Moulding block copolymers of acrylonitrile CESKOSLOVENSKA AKADEMIE VED 21 Aug 1975 [28 Aug 1974] 34811/75 Heading B5A Articles, particularly surgical articles such as soft contact lenses, catheter tips, soft IUD's, pessaries, and prostheses of, e.g. tendons, ear-drums, middle-ear organs and cartilages, are made by moulding a multiblock copolymer of acrylonitrile with at least one of acrylamide, acrylic acid and diacrylimide in the form of a gel or xerogel at a temperature higher than the glass transition point of any polymeric phase present but below 250‹ C., whereby a moulding is formed which, by virtue of its substantially unchanged composition and structure, retains the desirable properties, such as elastomersion of the starting materials. The method is also suitable for making impressions, printing plates and rollers. Compression, saturation, injection and calendering moulding techniques may be employed. |
