Patent ID: 6110406
Filing Date: 2000-08-29
Classification: B29B,B29K,C08J,Y10S

Abstract:
A method for producing a molding material, which comprises melt-extruding a composition comprised of a styrenic polymer essentially having a syndiotactic structure to give strands, thenrapidly cooling the strands at a mean cooling rate of not lower than 25.degree. C./sec to thereby cause T.sub.s .ltoreq.T.sub.m, wherein T.sub.m is the melting point temperature of the polymer and T.sub.s is the surface temperature of the strands, and thereaftergradually further cooling the rapidly-cooled strands at a mean cooling rate of not higher than 20.degree. C./sec for 2 to about 30 seconds, to thereby cause T.sub.s .ltoreq.T.sub.g +20.degree. C., wherein T.sub.g is the glass transition temperature of the polymer, thereby crystallizing the strands to a degree of crystallization of not lower than 15%, andpelletizing the crystallized strands into pellets, wherein said pellets have a degree of crystallization of not lower than 15%.