Basf Aktiengesellschaft

Fritz Reichel

Herbert Naarmann

Hans-Juergen Degen

Ulrich Riebeling

Lothar Hoehr

Hermann Gausepohl

Christof Taubitz

Kurt Wendel

Emil Scharf

Sizes for paper are based on finely divided aqueous dispersions of copolymers which are obtainable by copolymerization of from 10 to 56 parts by weight of a monomer mixture of

Paper size based on finely divided aqueous dispersions

Sizing agents for paper are based on finely divided aqueous dispersions of copolymers obtainable by copolymerizing from 40 to 140 parts by weight of a monomer mixture of

Sizing agents for paper based on finely divided aqueous dispersions

A paper size comprising a water-soluble salt of a copolymer of from 30 to 85% by weight of olefins of 2 to 12 carbon atoms, having a terminal double bond, and/or vinyl ethers, and from 15 to 70% by weight of basic acrylic and/or methacrylic compounds, which copolymer has a molecular weight of from 600 to 4,500 and is manufactured by continuous copolymerization at from 130.degree. to 320.degree. C.

Method of preparing a low molecular weight paper size polymer by

Shear-resistant aqueous copolymer emulsions which can be used for sizing paper are manufactured by first copolymerizing, in the aqueous phase of an aqueous emulsion, using conventional polymerization initiators which form free radicals, (A) from 0.5 to 15 per cent by weight of monomers containing a polymerizable C.dbd.C bond and at least one carboxyl and/or sulfonic acid or phosphate or phosphite group with (B) from 5 to 30 per cent by weight of monomers containing a C.dbd.C bond and a tertiary or quaternary amino group, or a nitrogen-containing heterocyclic group, and then adding, while continuing the copolymerization, (C) from 0 to 94.5 per cent by weight of styrene and/or acrylonitrile and (D) from 0 to 94.5 per cent by weight of acrylic or methacrylic acid esters of alkanols of 1 to 8 carbon atoms as well as (E) from 0 to 30 per cent by weight of further olefinically unsaturated monomers, and completing the polymerization, the pH during the polymerization being less than 7 and the amount of monomers (C) and (D) together being at least 25 per cent by weight.

Manufacture of shear-resistant aqueous copolymer emulsions

Process for the manufacture of surface-sized papers by impregnating a paper with a solution containing a water-soluble salt of a random polymer based on .alpha.-olefins and ethylenically unsaturated acids and a compound of the formula: ##EQU1## wherein R is alkyl, aryl or a radical of the formula: ##EQU2## and R.sup.1 and R.sup.2 each independently denotes H, R or a radical of the formula:

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Eppelheim, Germany

Fritz Reichel