TUBULAR MOLDING MATERIAL AND HEAT-SHRINKABLE FILM

摘要

Disclosed is a tubular molding material having vinyl aromatic hydrocarbon and conjugate diene as the primary components and having excellent bubble-forming stability in the manufacture of a heat-shrinkable film; further disclosed is a heat-shrinkable film which uses said molding material. (1) A tubular molding material contains a block copolymer comprised of vinyl aromatic hydrocarbon and conjugate diene as the primary components. The tubular molding material contains (a) micro-crystalline wax with a melting point as stipulated in JISK 2235 of 75-98°C, and (b) a glyceride for which the average degree of polymerization of the glycerin backbone is 1-10 and the carbon number is 11-21 for R for the fatty acid ester group represented by the general formula R-COO-. In addition, (2) the tubular molding material contains (a) 0.01-3 parts by mass of micro-crystalline wax and (b) 0.01-3 parts by mass of glyceride.