Coextruded rigid thermoplastic structures enabling biaxially oriented materials to be obtained
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United States of America Patent
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Jul 2, 1991
Grant Date -
N/A
app pub date -
Jul 21, 1989
filing date -
Jul 21, 1988
priority date (Note) -
Expired
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Abstract
Biaxially oriented rigid thermoplastic structures with multiple coextruded polymeric layers comprising a layer of vinyl chloride polymer and a coating layer of polymethyl methacrylate containing products absorbing ultraviolet radiation. The content of products absorbing ultraviolet radiation is such that the glass transition temperature of the coating layer does not exceed 105.degree. C., thus permitting an orientation in the range 95.degree.-110.degree. C.
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