STRUCTURED LATEX POLYMER PARTICLES

摘要

A structured latex polymer particle suitable for use in the preparation of a wet-laid composite sheet having good wet-end and end-use properties, has a core region comprising from 10 to 40 percent of the total polymer particle volume and a shell region comprising from 60 to 90 percent of the total polymer particle volume and comprising a vinyl acid. The core region is prepared to have good end-use properties as measured by tensile and elongation and the shell region is prepared to have good wet-end properties as measured by deposition and drainage time. The subject structured latex polymer particles are advantageously employed in the preparation of composite sheets of all types to form an economical and high quality composite sheet.