| 摘要 |
PURPOSE:To get heat shrinkable film with low temperature shrinkability and high impact properties by a method wherein copolymer block of the specific blockfying rate with high content of vinyl aromatic hydrocarbon is copolymerized with vinyl aromatic hydrocarbon polymer. CONSTITUTION:The said film is made of copolymerizated compound which is composed of segment A which is copolymerizated with 10-70wt% of within the total vinyl aromatic hydrocarbon used and copolymerizated segment B of vinyl aromatic hydrocarbon in which remnant vinyl aromatic hydrocarbon and conjugated diene are mixed at the weight ratio 75/25-93/7 and is polymerized so as the block ratio of vinyl aromatic hydrocarbon being 20-75wt%, and conjugated diene, and furthermore, the weight ratio of vinyl aromatic hydrocarbon and conjugated diene are 77/23-95/5, and this is drawn so as the heat shrinkage rate is above 15% (80 deg.C) and the coefficient of draw elasticity is above 5,000kg/cm<2>. This film is adapt for heat shrinkage coat of an irregular shaped good or a glass bottle. |
