Process for preparing a crystalline vinylidene chloride polymer powder, and compositions comprising it.

摘要

A crystalline vinylidene chloride polymer powder which is dispersible in polyols and other non-solvents for vinylidene chloride polymers is prepared by aging a latex of crystallizable vinylidene chloride polymer particles until substantially all the latex particles are crystallized and then recovering the latex particles from the latex. The resulting powder can be dispersed with moderate shear in a non-solvent for vinylidene chloride polymers, such as a polyol used in the preparation of polyurethane materials. A dispersion of the powder and a polyol is eminently suitable for use in the preparation of polyurethane foam material to impart enhanced load-bearing properties and flame-retardancy thereto.