Sheet of polyvinyl butyral and polyurethane

C - Chemistry – Metallurgy – 08 – L

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400/5479

C08L 29/14 (2006.01) B32B 17/10 (2006.01) C08J 5/18 (2006.01) C08L 75/04 (2006.01)

Patent

CA 2025508

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.

Pellicule formée d'un polymélange comprenant, en poids, a) 30 à 90 % de polyvinylbutyral contenant environ 11 à 30 % de groupes hydroxyle et b) 70 à 10 % de polyuréthane thermoplastique qui est le produit de réaction : i) d'un polyéther polyolique ou d'un mélange de polyéther polyolique et de polyester polyolique; et ii) d'un diisocyanate aliphatique, d'un diisocyanate aromatique ou d'un mélange de diisocyanates aliphatiques et aromatiques; les pourcentages combinés de a) plus b) dans le polymélange égalant toujours 100 %; à une épaisseur de 0,76 mm, cette pellicule présente un trouble qui n'excède pas 2 %.

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