Biaxially stretched composite styrene resin sheet
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United States of America Patent
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May 30, 1989
Grant Date -
N/A
app pub date -
Jun 23, 1987
filing date -
Jun 23, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A biaxially stretched composite styrene resin sheet of a multilayer structure, comprising at least one layer of polystyrene and at least two layers of a mixture of polystyrene and styrene/butadiene block copolymer resin, wherein both outside layers are formed of said mixture, the thickness of each of the outside layers is 1 to 20% of the total thickness of the sheet, and the entire sheet is biaxially stretched.
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