Cross-linked urea-formaldehyde polymer matrix compositions conta

Details Cross-linked urea-formaldehyde polymer matrix compositions conta Cross-linked urea-formaldehyde polymer matrix compositions conta

1982-05-17

1984-01-31

Pertilla, Theodore E.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524430, 524431, 524493, 524542, 524598, 525517, 502172, 502208, C08L 6124

Patent

active

044290756

ABSTRACT:
A cross-linked urea-formaldehyde polymer matrix is formed by catalyzing, using a buffered acid as the catalyst, an aqueous mixture of a 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.

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Reichherzer, R. and Chwala, A., "Condensation Products of Urea and Formaldehyde", 45 Chemical Abstracts 3647(g) (1950).

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