MICROPOROUS SYNTHETIC SHEET MATERIAL HAVING A FINISH OF A POLYESTER POLYURETHANE AND CELLULOSE ACETATE BUTYRATE

摘要

A vapor permeable coriaceous synthetic microporous sheet material having a high-quality finish coat of polyurethane and cellulose acetate butyrate is the subject of this invention; the finish in adherence with the microporous coating of the sheet material is a polymer blend of a chain-extended polyester polyurethane and cellulose acetate butyrate having a butyryl content of 10-60 percent by weight viscosity of about 1-20 poises.