| 摘要 |
PURPOSE:To obtain a biaxially drawn styrenic resin sheet having excellent toughness, impact resistance and transparency and resistant to cracking in the case of trimming a formed article of the sheet. CONSTITUTION:(A) A styrene-butadiene block copolymer preferably having a styrene:butadiene ratio of 25:75 to 75:25 and a weight-average molecular weight of 100,000-230,000 is compounded with (B) a graft-type high-impact styrene resin preferably having a rubber content of 5.0-10.0 and (C) a styrene resin in such a manner as to get a drawn sheet having an average rubber particle diameter of 0.08-0.25mum (especially 0.15-0.20mum) and also having a product of the particle diameter (mum) and the rubber concentration (wt.%) of 0.009-0.028 (especially 0.015-0.023). The composition is formed in the form of a sheet and biaxially drawn while adjusting the product of (the birefringence of the drawn sheet) and (the thickness mm of the sheet) to 1.00X10<-5>-2.25X10<-4> (especially 5.00X10<-5>-1.5X10<-4>). |
