Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1989-03-20
1990-10-09
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524512, 524567, 524557, 524558, 524562, C08K 534
Patent
active
049621416
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 disperson 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.
REFERENCES:
patent: 3830761 (1974-08-01), Lenney
patent: 4310450 (1982-01-01), Wang et al.
patent: 4357428 (1982-11-01), Watson et al.
patent: 4683260 (1987-07-01), Wickert
Davidowich George
Iacoviello John G.
Sadowski John S.
Vijayendran Bheema R.
Air Products and Chemicals Inc.
Gourley Keith D.
Marsh William F.
Schofer Joseph L.
Simmons James C.
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