Process for producing aqueous urea-formaldehyde

Details Process for producing aqueous urea-formaldehyde Process for producing aqueous urea-formaldehyde

1977-06-20

1979-11-13

Briggs, Sr., Wilbert J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

528254, 528256, 528259, C08G 1212, C08G 1232

Patent

active

041743105

ABSTRACT:
Aqueous urea-formaldehyde resins solutions are prepared by (a) forming a first aqueous solution containing urea and formaldehyde in a molecular ratio in the range urea:formaldehyde=1:3 to 1:1.5, (b) reacting the first aqueous solution under neutral or alkaline conditions to form a reaction mixture containing substantial amounts of methylol urea products, (c) vacuum evaporating the reaction mixture to produce a concentrated mixture having a solids content of 55% to 80% by weight, and (d) further condensing the concentrated mixture under acid conditions to produce a resinous material. The urea may be wholly or partially replaced by melamine.

REFERENCES:
patent: 2652377 (1953-09-01), Kise
patent: 3392150 (1968-07-01), Groll
patent: 3450659 (1969-06-01), Bondi et al.
patent: 3830783 (1974-08-01), Vargiu et al.
patent: 4026980 (1977-05-01), Hubbard
patent: 4039496 (1977-08-01), Hermann

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