Impact resistant soft coated laminates and process for making th

Details Impact resistant soft coated laminates and process for making th Impact resistant soft coated laminates and process for making th

1981-01-28

1987-04-21

McCamish, Marion C.

Stock material or miscellaneous articles

Composite

Of polycarbonate

4284256, 428447, B32B 900, B32B 1710, B32B 2736

Patent

active

RE0324060

ABSTRACT:
Improved impact or shock resistant soft coated laminates including a back polycarbonate lamina opposite the direction of impact or shock, such polycarbonate lamina having a soft overlying or exposed layer or coating opposite the direction of impact, are provided. The laminates exhibit excellent resistance to failure and spalling of the polycarbonate surface opposite the impact or shock receiving surface.
The soft coal is a self-healing, chemically resistant polyurethane having an excess of free hydroxyl groups over isocyanate groups and confers on the laminates excellent scratch resistance, good resistance against swelling and stress cracking while at the same time the laminates exhibit good clarity and integrity in addition to good chemical and permeation resistance, as well as resistance to failure and spalling. The process employs the polyurethane in film form as a cap sheet.

REFERENCES:
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patent: 3823577 (1974-07-01), Smith
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patent: 4027072 (1977-05-01), Molari
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patent: 4079160 (1978-03-01), Philipson
patent: 4081581 (1978-03-01), Littell
patent: 4121014 (1978-10-01), Schaffer
patent: 4123588 (1978-10-01), Molari

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