Cross-linked polyurethane resin sheet and laminated product empl

Details Cross-linked polyurethane resin sheet and laminated product empl Cross-linked polyurethane resin sheet and laminated product empl

1996-12-20

1998-07-28

Nakarani, D. S.

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

428338, 4284231, 4284233, 4284255, 4284256, 428428, 428429, B32B 1710, B32B 2740, C08G 1842

Patent

active

057860700

ABSTRACT:
A transparent, smooth and cross-linked polyurethane resin sheet prepared from a reaction-curable composition which comprises a high molecular weight polyol mixture (A) comprising a polyester polyol and/or a polycarbonate polyol, as its main components, and containing a diol and a trivalent or higher valent polyol, the average hydroxyl value of the mixture being from 40 to 120, and the equivalent ratio of (the trivalent or higher valent polyol)/(the diol) being from 0.1 to 0.8, a substantially bivalent chain extender (B) in an amount of from 1.9 to 6.0 equivalents per equivalent of the polyol mixture (A), and a substantially bivalent alicyclic or aliphatic polyisocyanate compound (C) in an amount of from 0.8 to 1.2 equivalents per equivalent of the sum of the polyol mixture (A) and the chain extender (B), as its main components.

REFERENCES:
patent: 4103070 (1978-07-01), Ammons
patent: 4683171 (1987-07-01), Kuga et al.
patent: 4725662 (1988-02-01), Kuga et al.
patent: 4997901 (1991-03-01), Yamada et al.
patent: 5100731 (1992-03-01), Yamada et al.
Database WPI, Derwent Publications, AN 87-025135, JP 02 051 922, Nov. 9, 1990.

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