| 摘要 |
PURPOSE:To enhance the strength of a film by compounding a specific amount of the thermal degradation substance of an ethylene-alpha, beta-ethylenic unsaturated monocarboxylic ester copolymer and a specific amount of a carboxyl group-containing polymer having a specific average MW. CONSTITUTION:An ethylene-alpha,beta-ethylenic unsaturated monocarboxylic ester copolymer having a relatively high MW is degraded under heating at 200-500 deg.C in an inert atmosphere or in the presence of steam to obtain a degradation product (A) having a viscosity average MW of 7,000-30,000 and containing 0.5-3mol% of a carboxylic acid unit, while a carboxyl group-containing polymer (B) with a viscosity average MW of 500-5,000 and an acid value of 30 or more is prepared. 90-10wt% of the aforementioned product (A) and 10-90wt% of said polymer (B) are dispersed in water to obtain an aqueous dispersing composition. The film by this aqueous dispersing composition is enhanced in film properties such as water resistance, film hardness or the like.
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