PROSES UNTUK MEMBUAT SUATU CETAKAN YANG SESUAI UNTUK KEGUNAAN OPTIK

摘要

PCT No. PCT/EP97/04020 Sec. 371 Date Jan. 25, 1999 Sec. 102(e) Date Jan. 25, 1999 PCT Filed Jul. 24, 1997 PCT Pub. No. WO98/04604 PCT Pub. Date Feb. 5, 1998Described is a process for preparing a molding suitable for optical purposes, which process comprises the conjoint free-radical polymerization of a precondensate (A) which is derived from at least one hydrolytically condensable silane (a) having at least one free-radically polymerizable group X, and of a monomer (B) having at least two free-radically polymerizable groups Y, the numerical ratio of groups X to groups Y being not greater than 5:1. The moldings obtainable by this process are characterized by high transparency and homogeneity, freedom from stress, scratch and abrasion resistance, high mechanical strength, etc.