Process for making solid urea-formaldehyde resins

Details Process for making solid urea-formaldehyde resins Process for making solid urea-formaldehyde resins

1985-10-31

1987-09-01

Pertilla, Theodore E.

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

Synthetic resins

From aldehyde or derivative thereof as reactant

523331, 528254, 528259, 528260, 528261, 528262, 528265, C08G 1234

Patent

active

046910018

ABSTRACT:
A process for the manufacture of a solid urea-formaldehyde resin comprises steps (a) to (d). Step (a), the initial reaction step is carried out under specified conditions with an F:U ratio of at least 2.5 to 1. The F:U ratio is lowered by addition of urea in step (c) and water is evaporated without precipitation of the resin in step (d).

REFERENCES:
patent: 2413697 (1947-01-01), Edgar
patent: 3102108 (1963-08-01), Aebi et al.
patent: 3842039 (1974-10-01), Vargiu et al.
patent: 4064088 (1977-12-01), Reaser
patent: 4113701 (1978-09-01), Laqua et al.
patent: 4174310 (1979-11-01), Hubbard
patent: 4381368 (1983-04-01), Spurlock
patent: 4564667 (1986-01-01), Taylor

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