Thermosetting size press composition

Details Thermosetting size press composition Thermosetting size press composition

1987-08-10

1989-01-10

Chin, Peter

Paper making and fiber liberation

Processes and products

With coating after drying

162136, 162137, 162166, 162167, 1621681, 1621811, 1621818, 428511, 428530, 525 58, 525162, D21H 336

Patent

active

047971762

ABSTRACT:
A thermosetting size applyable to paper in a size press and curable at a temperature not in excess of about 280.degree. F. for 10 seconds is disclosed. This size comprises an aqueous emulsion comprising water having suspended therein aqueous emulsion copolymer particles of monoethylenically unsaturated monomers comprising hydroxy-functional monomer having an hydroxy number of at least about 20, and the balance of the monomers provides a water insoluble polymer having a glass transition temperature of from about -20.degree. C. to about 50.degree. C. The emulsion has a pH greater than about 2.5, preferably from 4.0 to 7.0, and a stoichiometric deficiency of an aminoplast cross-linking agent is used for cure. An acid curing catalyst is uniformly distributed in the size to speed the cure.

REFERENCES:
patent: 2790735 (1957-04-01), McLaughlin et al.
patent: 2982682 (1961-05-01), Matlin
patent: 3878038 (1975-04-01), Opderbeck et al.

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