SHEET OF POLYVINYLBUTYLAL AND POLYURETHANE

摘要

A sheet formed of a polyblend comprising, on a weight basis, a) 30 to 90% polyvinyl butyral containing about 11 to 30 % hydroxyl groups and b) 70 to 10% thermoplastic polyurethane which is the reaction product of: i) polyether polyol or a mixture of polyether polyol and polyester polyol; and ii) aliphatic diisocyanate, aromatic diisocyanate or a mixture of aliphatic and aromatic diisocyanates; the combined percentages of a) plus b) in the polyblend always equaling 100%; such sheet at 0.76mm thickness having no greater than 2% haze.