Process for waterproofing gypsum materials

Details Process for waterproofing gypsum materials Process for waterproofing gypsum materials

1996-02-22

1997-12-30

Lusignan, Michael

Stock material or miscellaneous articles

Impregnated naturally solid product

4273936, 524 5, 524 6, C14C 900

Patent

active

057028281

ABSTRACT:
The invention provides a process for water-proofing gypsum materials which comprises adding, to a pulverulent gypsum plaster composition containing from 10 to 90% by weight of gypsum based on the total weight of the composition, a mixture of
a) from 1.0 to 15% by weight, based on the total weight of the composition, of one or more dispersion powders redispersible in water and based on vinyl acetate copolymers with ethylene and/or vinyl esters of C.sub.5 -C.sub.15 -monocarboxylic acids, styrene copolymers with acrylic esters of alcohols having from 1 to 18 carbon atoms, vinyl chloride copolymers with ethylene and/or vinyl esters of C.sub.2 -C.sub.15 monocarboxylic acids, and
b) from 0.05 to 5.0% by weight, based on the total weight of the composition, of one or more thixotropic additives from the group consisting of polyacrylic acids and their salts, smectites, bentonites, carboxymethylcelluloses and melamine-formaldehyde condensates.

REFERENCES:
patent: 3671280 (1972-06-01), Smith
patent: 3869415 (1975-03-01), Williams
patent: 4851047 (1989-07-01), Demlehner et al.
patent: 5041475 (1991-08-01), Kambayashi et al.
patent: 5075358 (1991-12-01), Riley et al.
patent: 5118751 (1992-06-01), Schulze et al.
English Derwent Abstract AN 73-37885U, no date.
English Derwent Abstract AN 92-251861, no date.
English Derwent Abstract AN 89-179851, no date.
Derwent Abstract AN 93-049442, Jun., 1993.
Derwent Abstract AN 83-10505K, May, 1983.

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