Compound catalyst system usable for the polymerization or curing of urea-formaldehyde polymeric condensation systems
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United States of America Patent
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Feb 12, 1985
Issued Date -
N/A
app pub date -
Nov 14, 1983
filing date -
May 17, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Using a buffered acid catalyst, a cross-linked urea-formaldehyde polymer matrix is formed by catalyzing an aqueous mixture of an urea-formaldehyde concentrate, urea-formaldehyde resin, and powdered urea. The resulting thermoset polymer which possesses, in part, a cyclic structure, is of unusual hardness and has utility, with or without fillers, as a molding or casting material possessing controllable shrinkage characteristics because of uniform molecular structure and formula versatility. The catalyst system may be used for the polymerization or cure of other urea-formaldehyde or polymeric condensation systems.
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