Liquid foams of reinforced unsaturated polyester resins and process for making the same
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United States of America Patent
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May 7, 1985
Issued Date -
N/A
app pub date -
Apr 2, 1984
filing date -
May 11, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The process for obtaining fiber-reinforced foams suitable to be transformednto reinforced solid cellular materials having a density lower than 0.7 kg/l, if inert fillers are not present, and lower than 1 kg/l if inert fillers are present as well, essentially by mechanical incorporation of gas or a mixture of gases into an unsaturated polyester resin containing conventional additives is described. As reinforcing materials synthetic, vegetable or mineral fibers having a maximum length of 3 mm are employed. The mixture of the resin with the fibers, and optionally with the inert fillers, is conveyed by at least one pump to a mechanical foaming device which introduces into the mixture gas in form of small bubbles, homogeneously and uniformly distributed therein.
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