TITLE: CROSS-LINKED UREA-FORMALDEHYDE POLYMER MATRIX COMPOSITIONS CONTAINING
CYCLIC INTERMEDIATE STRUCTURES.
European Patent Application EP0108144 A1

ABSTRACT:
Abstract not available for EP0108144
Abstract of corresponding document: US4429075
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.

INVENTORS:
Carlson, John E.

APPLICATION NUMBER: EP19830902041
PUBLICATION DATE: 05/16/1984
FILING DATE: 05/12/1983

ASSIGNEE: CHEM NUCLEAR SYSTEM INC (US)
INTERNATIONAL CLASSES: C08G12/12; C08L61/24; (IPC1-7): C08L61/24
EUROPEAN CLASSES: C08G12/12; C08L61/24+B4B3+C

FOREIGN REFERENCES:
4230597 Conversion of radioactive waste materials into solid form
4161467 Reactive catalyst for amino resins
2872425 Process of preparing urea-formaldehyde molding composition

OTHER REFERENCES:
See also references of WO 8304037A1