Ethylene-vinyl chloride copolymer emulsions containing tetrameth

Details Ethylene-vinyl chloride copolymer emulsions containing tetrameth Ethylene-vinyl chloride copolymer emulsions containing tetrameth

1990-05-31

1991-03-12

Cannon, James C.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

162135, 210508, 428290, 428514, B01D 3918, B32B 2726, B32B 2730

Patent

active

049992392

ABSTRACT:
Aqueous emulsions containing an ethylene-vinyl chloride (EVCl) copolymer and tetramethylol glycoluril are described for use as binder compositions suitable for application onto nonbonded filter paper. The emulsions are prepared by incorporating 4 to 10 wt % tetramethylol glycoluril, based on the total weight of the emulsion copolymer, into an aqueous dispersion of a copolymer consisting essentially of 65 to 90 wt % vinyl chloride, 5 to 35 wt % ethylene and optionally, up to 10 wt % of a hydroxyalkyl- or carboxylic acid-containing functional comonomer. The polymerization is conducted in the presence of a stabilizing system consisting essentially of 3 to 15 wt % polyvinyl alcohol. Filter paper impregnated with these emulsions maintain tensile strength and flexibility upon being subjected to hot oil.

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