Process for the manufacture of a sheet or film made of polycarbonate with a soft scratch-resistant coating
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United States of America Patent
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Jan 11, 1994
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N/A
app pub date -
Apr 1, 1991
filing date -
Mar 31, 1990
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Abstract
A process for the manufacture of a plate, sheet or film made of an impact-resistant polymer having thereon a scratch-resistant flexible coating of transparent polyurethane is described comprising the steps of: (i) applying a first reaction mixture on the plate, sheet or film of impact-resistant polymer, said first reaction mixture comprising: (a) an isocynate component and (b) a polyol component, and (ii) applying a second reaction mixture onto said first layer before said first layer has completely hardened, said second reaction mixture comprising (c) a second isocynate component, and (d) a second polyol component. The first reaction mixture has a composition which guarantees good adhesion to the plate, sheet or film whereas the second reaction mixture exhibits excellent scratch resistance.
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