Patent ID: 7956155
Filing Date: 2011-06-07
Classification: B01D,C08F,C08J

Abstract:
1. Process for preparing polymeric materials based on syndiotactic polystyrene containing the epsilon crystalline phase, comprising the following steps: a) preparation of polymeric materials based syndiotactic polystyrene containing the gamma crystalline form; b) treatment of said materials with chloroform until a molecular complex phase with chloroform is obtained and c) extraction of chloroform and obtaining of polymeric materials based on syndiotactic polystyrene containing the epsilon crystalline form wherein syndiotactic polystyrene represents a styrene homopolymer or styrene copolymers with CH 2 ═CH—R olefins, wherein R is an alkyl-aryl or a substituted-aryl radical with 6-20 carbon atoms, or with other copolymerizable ethylenically unsaturated monomers, such copolymers being characterized by a microstructure prevailingly syndiotactic and by a molar content of styrene larger than 40%.