Sheet of polyvinyl butyral and polyurethane
AssigneeMonsanto Company
InventorsDonald J. David, Thomas F. Sincock
Life of this patent
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Abstract
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 0.76 mm thickness having no greater than 2% haze.
Claims14
A sheet formed of a polyblend comprising, on a weight basis, (a) 30 to 90% polyvinyl butyral containing 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%;
- said sheet at 0.76 mm thickness in a laminate with glass having no greater than 2% haze.
An energy-absorbing, thermoplastic sheet having no more than 2% haze in a laminate with glass comprising:
- (a) 100 weight parts of a compatible mixture of 30 to 70 weight % polyvinyl butyral containing about 15 to 25 weight % hydroxyl groups and 70 to 30 weight percent aliphatic polyurethane;
- and
- (b) about 3 to about 20 weight parts plasticizer.
Dependencies are inferred from the claim text.