Method of impregnating a water-penetrable article with a swell-i

Details Method of impregnating a water-penetrable article with a swell-i Method of impregnating a water-penetrable article with a swell-i

1985-08-16

1986-09-23

Lilling, Herbert J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Noninterengaged fiber-containing paper-free web or sheet...

427243, 427294, 427296, 427387, 4273899, 427392, 427395, 428454, 524446, 524447, B32B 2704, B32B 904, B32B 1304, B05D 302

Patent

active

046135421

ABSTRACT:
A method of impregnating a water-penetrable article with a clay slurry includes temporarily inhibiting the swellability of the clay to unexpectedly increase the clay content and decrease the viscosity of the slurry to achieve a higher clay content in a clay-impregnated, water-penetrable article. The swelling capacity of a water-swellable clay composition in contact with water is temporarily inhibited for greater impregnation of the clay into the fibrous article by mixing with a water-swellable clay a water soluble anionic polymer having a weight average molecular weight of about 2,000 to about 150,000 and water. The water soluble anionic polymers temporarily inhibit the swelling capacity of the water-swellable clays to decrease the viscosity of the clay slurry to achieve a higher clay content or more efficient and faster clay impregnation into a water-penetrable, e.g. fibrous, article. The water soluble anionic polymers having a weight average molecular weight in the range of 2,000 to 150,000 temporarily will inhibit the swelling of a water-swellable clay so that the clay solids content of the slurry can be approximately doubled for impregnation. The temporary swell-inhibiting properties of the relatively low molecular weight anionic polymers permit impregnation of a clay slurry having a relatively low viscosity so that the clay solids content of the slurry can be substantially increased for impregnation. Upon breakdown of the polymers to a weight average molecular weight below about 2,000, such as by heating above about 200.degree. F., the clay reverts to its original properties.

REFERENCES:
patent: 3764530 (1973-10-01), Burland et al.
patent: 3825441 (1974-07-01), Achermann et al.
patent: 4161566 (1979-07-01), Higgins
patent: 4209568 (1980-06-01), Clem
patent: 4339479 (1982-07-01), Robbart
patent: 4467015 (1984-08-01), Clem
patent: 4529663 (1985-07-01), Lancaster

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