ROUGH-SURFACED POLYVINYL BUTYRAL SHEET AND METHOD OF FORMING SAME

摘要

A plasticised sheet comprises a polyvinyl butyral (PVB) matrix contg. discrete particles of crosslinked PVB which are integrally randomly dispersed in the matrix and microscopically protrude from the surface of the sheet forming a rough surface. Also claimed is the prepn. of a PVB sheet comprising extruding a plasticised formulation contg. PVB and a fraction of stiffly resilient particles of crosslinked PVB through a die opening.