Process for the production of a molded body comprising pressed p

Details Process for the production of a molded body comprising pressed p Process for the production of a molded body comprising pressed p

1990-06-13

1992-07-14

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Stratified or layered articles

156 622, 156335, 264120, B29C 4300

Patent

active

051300729

ABSTRACT:
In the process for the production of a molded body having a pressed core of solid inert particles which are coated with a thermoset phenolic resin, phenolic compounds on a basis of bisphenol, in particular a bis(hydroxyphenyl)alkane, and at least one compound which produces formaldehyde, and also a catalyst and optionally further additives customarily employed in the preparation of phenolic resins are mixed together with the inert particles. The mixture of particles obtained, preferably after precompressing and preforming, is pressed to form the molded body. During pressing under the action of heat formaldehyde is set free and the phenolic resin is completely cross-linked.

REFERENCES:
patent: 2986546 (1961-05-01), Naps
patent: 3133900 (1964-05-01), McDonald
patent: 3429762 (1969-02-01), Nakagawa et al.
patent: 4044087 (1977-08-01), Robitschek et al.
patent: 4195019 (1980-03-01), Babina et al.
patent: 4244906 (1981-01-01), Heinemann et al.
patent: 4337334 (1982-06-01), Shimizu et al.
Chemical Abstract, vol. 106, Nr. 18, p. 40, 1987, Alkaline discoloration-resistant phenolic resin construction materials.

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