Patent ID: 6342573
Filing Date: 2002-01-29
Classification: B29C,B29K

Abstract:
A process for the preparation of end-products based on a vinylaromatic polymer with a predominantly syndiotactic structure which comprises:a) compressing the polymer in powder form in a mould at a pressure ranging from 0.1 to 500 Mpa; b) sintering the compressed powder, under pressure, at a temperature ranging from the glass transition temperature of the polymer (Tg) to 150Â° C.; c) cooling the end-product to room temperature; and wherein the polymer in powder form is obtained by a process which consists of the following operating steps: i) polymerizing at least one vinylaromatic monomer in the presence of a catalytic system capable of producing a polymer with a predominantly syndiotactic structure; ii) recovering the polymer by precipitation and filtration; iii) drying the polymer at atmospheric pressure and at a temperature ranging from 20 to 80Â° C.