Process for the preparation of aminoplastic resins having very l

Details Process for the preparation of aminoplastic resins having very l Process for the preparation of aminoplastic resins having very l

1988-12-23

1991-03-05

Foelak, Morton

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

Synthetic resins

From aldehyde or derivative thereof as reactant

528259, 528260, 525509, 524 14, 524405, 524597, 428500, 428504, 428524, 428528, C08G 1212, C08C 1410, C08K 338, C08L 6134

Patent

active

049979051

ABSTRACT:
The preparation of aminoplastic resins containing melamine, having very low rates of formaldehyde emission, and being particularly useful for the production of particle boards. In a second stage of the process for preparing the resin, additional NH.sub.2 (melamine and urea) is added to a conventional condensate solution at an increased pH between 6 and 9 so as to lower the F/NH.sub.2 molar ratio to between 0.5 and 0.9. Urea is added in a third stage to obtain an F/NH.sub.2 of between 0.30 and 0.50, with the optional addition of borax.

REFERENCES:
patent: 3874990 (1975-04-01), Surdyk
patent: 4362827 (1982-12-01), Tinkelenberg et al.
patent: 4482699 (1984-11-01), Williams
patent: 4510278 (1985-04-01), Hoetjer
patent: 4603191 (1986-07-01), Kong
patent: 4814422 (1989-03-01), Diem et al.

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