Starch/latex cast coatings for paper

Details Starch/latex cast coatings for paper Starch/latex cast coatings for paper

1977-01-26

1978-08-22

Woodberry, Edward M.

Stock material or miscellaneous articles

Composite

Of addition polymer from unsaturated monomers

260 174ST, 428535, B32B 2308, B32B 2710, C08L 302

Patent

active

041090560

ABSTRACT:
A non-proteinaceous binder is provided for cast coating of paper which comprises three primary components: a modified starch; a styrene-butadiene latex characterized by a particle size of about 800 to about 1300 angstroms, a solids content of between about 45.0 and about 47.0%, a maximum 200 mesh residue of about 0.075 gms./900 mls., a pH of between about 3.8 and 4.8, a maximum Brookfield viscosity of about 100, and a surface tension of between about 43.0 and about 49.0; and a second styrene-butadiene latex characterized by a particle size of about 1350 to about 1650 angstroms, a solids content of between about 47.0 and about 49.0%, a maximum 200 mesh residue of about 0.05 gms./900 mls., a pH of between about 5.5 and 6.5, a maximum Brookfield viscosity of about 300 cps., and a surface tension of between about 49.0 and 55.0. An aqueous aliquot portion of the composition is coated on a paper substrate, pressed against a chromium heat roll and dried, thereby providing a cast coated paper according to the invention.

REFERENCES:
patent: 3020176 (1962-02-01), Robinson et al.
patent: 3282866 (1966-11-01), Pohlemann et al.
patent: 3341392 (1967-09-01), Potter
patent: 3395072 (1968-07-01), Talet et al.
patent: 3399074 (1968-08-01), Gottwald et al.
patent: 3832216 (1974-08-01), Cressey
patent: 3925328 (1975-12-01), Shibahara et al.
patent: 3939108 (1976-02-01), Sirota et al.

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