Process for obtaining reinforced cellular materials based on unsaturated polyester resins
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United States of America Patent
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Apr 24, 1984
Issued Date -
N/A
app pub date -
May 20, 1982
filing date -
Feb 22, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for obtaining cellular materials from unsaturated polyester resins reinforced with fillers having a density below 0.7 kg/lt by injecting a liquid foam, made from the resins by mechanical introduction of a gas therein into a closed mold, is described. The liquid foam, obtained from polyester resins including additives and optionally a reinforcement of synthetic, artificial, vegetable or mineral fibres having a length lower than 5 mm, and optionally containing a low boiling foaming agent, is injected voluminized and cross-linked in the hot or in the cold in a closed mold containing a reinforcing agent of synthetic, artificial, vegetable or mineral fibers as a monofilament mat, a cut fibre mat, a mono or bidirectional roving woven mat, rovings, fabrics.
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