Hollow particles of crosslinked melamine resin having a uniform

Details Hollow particles of crosslinked melamine resin having a uniform Hollow particles of crosslinked melamine resin having a uniform

1994-03-28

1994-11-01

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 56, 521 64, 521 78, 521 79, C08J 932, B01J 1302

Patent

active

053608321

ABSTRACT:
A process for producing hollow particles of crosslinked melamine resin having a uniform particles diameter, said process comprising subjecting a water-soluble methyl-etherified-melamine resin precondensate to condensation reaction in the presence of a curing catalyst in an aqueous solution containing a water-soluble polymer with carboxyl groups or water-soluble copolymer of ethylenically unsaturated carboxylic acid monomer, when the reaction liquid becomes turbid, adding to the reaction mixture a substance which dissolves or swells the melamine resin, and continuing the condensation reaction, if necessary.

REFERENCES:
patent: 2797201 (1957-06-01), Veatch et al.
patent: 3960583 (1976-06-01), Netting et al.
patent: 4264742 (1981-04-01), Golden et al.
patent: 4420442 (1983-12-01), Sands
patent: 4902413 (1990-02-01), Stout et al.
patent: 4986908 (1991-01-01), Stout et al.

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