PURPOSE: The titled composition useful for coating, having improved transparency and surface gloss of a film, and good emulsion stability, obtained by subjecting an ethylenic unsaturated monomer to emulsion polymerization in the presence of a vinyl copolymer modified with a specific cellulose derivative.
CONSTITUTION: In the presence of a vinyl copolymer (containing preferably ≥50wt% acrylic acid ester, etc.) modified with a cellulose derivative, having an acid value of 3W150, obtained by copolymerizing the cellulose derivative (especially cellulose acetate butyrate) with an ethylenic unsaturated acid (e.g., acrylic acid, etc.) and another ethylenic unsaturated monomer (especially acrylic acid ester, etc.), an ethylenic monomer in a weight ratio of the copolymer to the monomer (1:0.1)W(1:10) is copolymerized in an aqueous medium at 50W200°C in the presence of a radical polymerizing agent by emulsion polymerization. The addition of a polyfunctional unsaturated monomer in an amount to give ≤30wt% that of the monomer and not to cause gelation improves emulsion stability, and the surface gloss of a film.
YAMAMOTO KENJI
KOMATSUZAWA TOSHIKI
SUKEJIMA HAJIME
NOMOTO KAZUO
| JPS57207608A | 1982-12-20 |