Preparation of aminoplast resin particles

Details Preparation of aminoplast resin particles Preparation of aminoplast resin particles

1979-05-03

1981-08-18

Anderson, Harold D.

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

Synthetic resins

From aldehyde or derivative thereof as reactant

260 173, 260 37NP, 260 39P, 260 294R, 525509, 528240, 528242, 528244, 528259, 528265, 528502, 162146, 162166, C08G 1212

Patent

active

042847591

ABSTRACT:
Aminoplast resin pigments for paper making comprise large surface area (>5m.sup.2 /g) particles, preferably of size below 200 .mu.m, made from an aminoplast resin made by condensing formaldehyde with urea and/or melamine in the presence of 0.2 to 15 moles, per 100 moles of formaldehyde, or sulphite, phosphate, phosphite or borate radicals. The resin may be converted to the particulate form by gelling the resin in extended form by dilution with an aqueous acid, followed by drying, curing, and comminution of the gelled resin. To effect gelation in extended form the resin is preferably diluted to a resin solids content of less than 25% by weight by the addition of sufficient acid to cause gelation within 20 minutes.

REFERENCES:
patent: 2556898 (1951-06-01), Brookes et al.
patent: 2863842 (1958-12-01), Bonzagni
patent: 3909348 (1975-09-01), Economou et al.
patent: 3928272 (1975-12-01), Brancato et al.
patent: 3941734 (1976-03-01), Aignesberger et al.
patent: 3983269 (1976-09-01), Pearson
patent: 4172057 (1979-10-01), Henbest
Chemical Abstracts, 83, 80292y (1975).

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