Thermoformed poly (methyl methacrylate) sheets with protective film
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United States of America Patent
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Jan 18, 1994
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N/A
app pub date -
Sep 9, 1992
filing date -
Aug 17, 1988
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Expired
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Abstract
A process for thermoforming a sheet of poly(methyl methacrylate) which has a reduced viscosity of at least 1.5, protected on at least one of its faces, by a ethylene polymer film, in intimate contact with it, and which has undergone a corona discharge treatment. The protective film of ethylene polymer has a density not exceeding 0.935 and a melt index lower than 1.0 g/10 min. The ethylene polymer film can be coated with a layer of acrylic adhesive after the ethylene polymer film has undergone the corona treatment.
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