Process for the manufacturing a cured expanded non-cracking dime

Details Process for the manufacturing a cured expanded non-cracking dime Process for the manufacturing a cured expanded non-cracking dime

1974-10-29

1977-07-12

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

260 25F, 264 453, 264 455, 264 465, 264 53, 264 54, 264DIG2, 264DIG5, 264DIG7, 264DIG17, B29D 2700

Patent

active

040354563

ABSTRACT:
A strong, expanded moulded panel or board, having a specific gravity between 0.2 and 0.8, is produced by heating dry urea formaldehyde resin containing 4% to 8% volatile materials in a mould at between 130.degree. and 160.degree. C under light restraining pressure between 30 and 300 psi which permits moderate expansion of the resin owing to the gasification of the volatile materials.

REFERENCES:
patent: 2016198 (1935-10-01), Howald
patent: 2376653 (1945-05-01), Boyer
patent: 2611750 (1952-09-01), White
patent: 2754274 (1956-07-01), Boyer
patent: 2754275 (1956-07-01), Boyer
patent: 3004293 (1961-10-01), Kreidl
patent: 3470115 (1969-09-01), Moore et al.
patent: 3707414 (1972-12-01), Wismer et al.
Brydson, J. A. "Plastics Materials," Princeton, N. J., D. Van Nostrand, c 1966, pp. 408-417.

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