POLYMERIZABLE LIQUID COMPOSITION AND PROCESS FOR THE PRODUCTION OF ORGANIC GLASS OF THE POLYURETHANE TYPE

摘要

The present invention relates to a polymerizable liquid composition and a process for the production of organic glass of the polyurethane type, which envisages a casting and polymerization process of polymerizable liquid compositions, comprising the following phases: a) mixing two components (A) and (B), wherein component (A) consists of a mixture of a cyclo-aliphatic diisocyanate monomer and a pre-polymer obtained by reaction between said cyclo- aliphatic diisocyanate monomer and one or more polyols and two or more hydroxyl groups and component (B) con- sists of one or more polyols; b) addition of a polymerization catalyst to the polymerizable liquid composition obtained in phase a); c) mixing for a time varying from 5 to 10 minutes, at an absolute pressure ranging from 5 to 10 mbar and a temperature ranging from 10°C to 25°C; d) filling one or more moulds and polymerization of the liquid composition by thermal treatment.