Process for producing particles of crosslinked melamine resin ha

Details Process for producing particles of crosslinked melamine resin ha Process for producing particles of crosslinked melamine resin ha

1991-02-07

1993-09-21

Carrillo, Ana L.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525238, 525221, 525218, C08L 3326, C08L 3320, C08L 6128, C08L 6132

Patent

active

052466167

ABSTRACT:
A process for producing the particles of crosslinked melamine resin having a uniform diameter in the following manner that water soluble precondensate of methyl-etherified melamine resin undergoes condensation reaction to give particles of crosslinked melamine resin having a uniform diameter, the condensation reaction is performed in an aqueous solution adjusted to a certain pH at 20.degree. to 70.degree. C., the aqueous solution contains a copolymer of acrylamide or methacrylamide with acrylic acid or methacrylic acid, a partial hydrolyzate of acrylamide or methacrylamide, or a saponified product of acrylonitrile, the pH adjustment is accomplished by an organic acid such as acetic acid, oxalic acid, formic acid, and p-toluenesulfonic acid, or an inorganic acid such as sulfuric acid and hydrochloric acid, which functions as a curing agent, and the preferred pH is in the range of 5 to 8.

REFERENCES:
patent: 4049607 (1977-09-01), Berghoff
patent: 4711749 (1987-12-01), Kosaka et al.
Amino Resins, John F. Blais, Reinhold Publishing Corp., New York, 1959, pp. 20-21, 52-53.
Chemical Patents Index, Basic Abstracts Journal, Week 9022, Jul. 25, 1990, Derwent Publications Ltd., London, GB--164412.

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