Fractional melt flow rate polymer powders and process for their preparation

摘要

The present invention relates to fractional melt flow rate powders wherein the particles are substantially spherical in shape and range in size from about 10 up to about 200 microns. The invention also relates to a process whereby a dispersible olefin copolymer resin can be converted into a microfine powder with reduced melt index. The process entails dispersing a molten olefin copolymer resin containing silane functionality in a liquid medium in the presence of a nonionic surfactant and catalyst and, after the melt flow rate is reduced to the desired level, cooling the dispersion to below the melt point of the olefin polymer.