To provide a composition which is excellent in low temperature workability and solvent resistance for printing with oily ink, can be brought into contact with a solvent with little lowered performance, and is excellent in mechanical strength, and is particularly suitable for use in a shrink film or a sheet.
The vinyl aromatic hydrocarbon-base composition comprises mainly a resin (a) and a resin (b) at a mixture weight ratio of 0.10≤a/(a+b)≤0.95, wherein the resin (a) comprises 100 pts.wt. of a copolymer and 0.1-5 pts.wt. of liquid paraffin, and has a Viscat softening point of 55-88°C, wherein the copolymer is comprised of 75-95 wt.% of a vinyl aromatic hydrocarbon and 25-5 wt.% of a 12-18C aliphatic unsaturated carboxylic acid alkyl ester; and the resin (b) has a polymer block containing mainly at least one vinyl aromatic hydrocarbon and another polymer block containing mainly at least one conjugate diene derivative, wherein the resin (b) has a vinyl aromatic hydrocarbon content of 60-95 wt.% and a conjugate diene derivative content of 40-5 wt.%. The film is made of the vinyl aromatic hydrocarbon-base composition.
COPYRIGHT: (C)2008,JPO&INPIT
Takeshi Shimizu
Joi Ito
Hideo Takei