| 摘要 |
PURPOSE:To obtain a composition excellent in photodegradability, heat resistance, transparency and mechanical strengths by mixing a modified polyethylene having carbon monoxide or the like as a comonomer component with polypropylene completely freed from any light stabilizer and antioxidant. CONSTITUTION:A resin composition comprising 90-65wt.% modified polyethylene mainly consisting of ethylene and prepared by copolymerizing ethylene with 0.5-10wt.% carbon monoxide, alone or together with an ethylenically unsaturated compound, and 10-35wt.% polypropylene completely freed from any light stabilizer and antioxidant. When the copolymerization rate of the carbon monoxide is below 0.5wt.%, the rate of photodegradation is markedly low, and when it is above 10wt.%, the rate of photodegradation is so high that the strength is decreased within a short time undesirably. As the ethylenically unsaturated compounds used, vinyl acetate and ethyl acrylate are desirable from the viewpoints of cost, film strengths, heat resistance, gloss and haze. |
