Composite board and method
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United States of America Patent
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Apr 4, 1989
Grant Date -
N/A
app pub date -
Mar 27, 1987
filing date -
Mar 27, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A composite board is produced by the method of blending a cellulosic filler having sufficient extractable organic content and an expandable thermoplastic polymer, adding a tacifier agent during blending for producing a pre-blown mixture, heating the mixture in a mold to a temperature above the glass transition temperature of the polymer for a period of time sufficient to permit expansion of the beads and bonding of the expanded beads with the cellulosic filler to thereby form a composite board. The board may be laminated by a solvent based adhesive or a thermal insult coating so as to form rigid macro-voids between the laminate and the composite board surface.
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