Process for preparing a styrenic resin

摘要

The preparation of a styrenic polymer is disclosed which preparation comprises the step of extruding a styrenic polymer powder having a syndiotactic configuration in the presence of water in an amount of 0.01 to 5 % by weight based on the weight of the styrenic polymer powder using an extruder. The preparation concerns a styrenic polymer powder having a highly syndiotactic configuration (SPS) in which the weight-average molecular weight of the styrenic polymer is in the range of 1x10<4> to 2x10<6> and in which the weight fraction of an extract extracted with methylene chloride from a gel obtained by dissolving the styrenic polymer in 1,2,4-trichlorobenzene and then cooling the solution is 10% by weight or less, and a molded article comprising the SPS is also disclosed. According to the present invention, there can be provided a styrenic polymer having a syndiotactic configuration (SPS) which permits the formation of stretched films having a high breaking strength and the formation of molded articles having a high Izod impact strength, a high heat deformation temperature and a high breaking strength under long-term heating and inhibiting the deterioration of the surface gloss of the molded articles, even if the molded articles are intermittently or continuously used at a high temperature.