초록

The present invention is directed to stable aqueous dispersions of an acrylic modified chlorinated polyolefin and a process for their preparation. The aqueous dispersions of acrylic modified chlorinated polyolefin are effective for use as coatings on treated and untreated polyolefinic substrates.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method for forming an aqueous dispersion of an acrylic modified chlorinated polyolefin, the method comprising:forming an acrylic modified chlorinated polyolefin polymer in an organic solvent, the acrylic modified chlorinated polyolefin polymer having sufficient ioniza

[ What is claimed is:] [1.]1. A method for forming an aqueous dispersion of an acrylic modified chlorinated polyolefin, the method comprising:forming an acrylic modified chlorinated polyolefin polymer in an organic solvent, the acrylic modified chlorinated polyolefin polymer having sufficient ionizable groups to provide the acrylic modified chlorinated polyolefin polymer with an acid value of at least about 10, the acrylic modified chlorinated polyolefin polymer being formed by joining an acrylic having ionizable groups with a chlorinated polyolefin to provide the acrylic modified chlorinated polyolefin which has an acrylic portion, the chlorinated polyolefin polymer having a chlorine content of about 15 to about 35 weight percent, based on the weight of solid chlorinated polyolefin polymer, and a weight average molecular weight of about 1,000 to about 200,000, the acrylic portion having a weight average molecular weight in the range of from about 2,000 to about 2,000,000, the acrylic modified chlorinated polyolefin polymer being at least about 25 weight percent soluble in the organic solvent at processing temperatures;neutralizing the ionizable groups of the acrylic modified chlorinated polyolefin polymer with an amount of neutralizer effective to form a solution of neutralized polymer;blending the solution of neutralized polymer with water to form a blend of neutralized polymer, organic solvent, and water; andremoving the organic solvent from the blend at a temperature and pressure effective for forming a dispersion of the acrylic modified chlorinated polyolefin polymer having a particle size of not more than 15 microns, the dispersion having less than about 10 weight percent organic solvent, at least about 10 weight percent solids, and a viscosity of less than about 10 poise at ambient temperature, the dispersion effective for providing a coating having an adhesion to polyolefinic substrates of at least about 4B.