THERMOFORMABLE COMPOSITION INCLUDING POLYOLEFIN, STYRENE POLYMER AND STYRENE-BUTADIENE-STYRENE BLOCK COPOLYMER

摘要

ABSTRACT OF THE DISCLOSUREA thermoformable polymer blend composition is provided hereincomprising 54 to 82% by weight of polyethylene or polypropylene; 15 to40% by weight of a styrene polymer; 2 to 10% by weight of a thermoplasticstyrene-butadiene-styrene block copolymer rubber compatibilizer; saidcompatibilizer having a softness parameter of greater than 200 psi interms of the 300% modulus and a melt ineex of 1.4 to 22 grams/10 min.under Condition G of ASTM Test D 1238-73. Processes of molding articlesand sheets from this blend are also provided. These polymer blends havea combination of useful properties including thermoformability, resis-tance to fats, ductility, low temperature impact strength, printability,relatively low cost and other characteristics which make them attractivematerials for use in many applications, e.g., packaging, plastic dinner-ware, non-packaging containers, refrigerator liners, etc. This blend canbe formed on conventional machinery by any of the known thermoplasticforming techniques, e.g., injection molding, thermoforming, stamping,forging, solid phase forming, rotary molding or the like to give productshaving the beneficial properties of both types of polymers.