EP 0039794 B1 19830824 - ANIONIC DISPERSIONS, PROCESS FOR THEIR PREPARATION AND THEIR USE AS SURFACE SIZING AGENTS FOR PAPER
Title (en)
ANIONIC DISPERSIONS, PROCESS FOR THEIR PREPARATION AND THEIR USE AS SURFACE SIZING AGENTS FOR PAPER
Publication
Application
Priority
DE 3018081 A 19800512
Abstract (en)
[origin: EP0039794A1] 1. An anionic dispersion produced by a two-stage polymerization reaction, a mixture of nonionic ethylenically unsaturated monomers containing sulphonic acid groups being copolymerized in the first polymerization stage in the manner of a solution copolymerization in a water-miscible solvent in the presence of a polymerization initiator, which is soluble in the monomer mixture, to give a homogeneous solution, and, after dilution with water, polymerization being carried out in the second polymerization stage in the manner of an emulsion polymerization in the presence of a usual amount of a water-soluble polymerization initiator, characterized in that in the first polymerization stage a mixture of a) 85 to 55% by weight of nonionic ethylenically unsaturated monomers, and b) 15 to 45% by weight of ethylenically unsaturated monomers containing sulphonic acid groups is copolymerized in the presence of 0.015 to 0.15 mole of a polymerization initiator, which is soluble in the monomer mixture, per mole of monomer mixture, the homogeneous polymer solution is diluted with water in a weight ratio of 1 : 3 to 1 : 50, and 1 to 4 parts by weight of at least one nonionic ethylenically unsaturated monomer per part by weight of the solution polymer are polymerized in this polymer solution in the second polymerization stage.
IPC 1-7
IPC 8 full level
C08F 257/02 (2006.01); C08F 265/00 (2006.01); D21H 17/42 (2006.01)
CPC (source: EP)
D21H 17/42 (2013.01)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0039794 A1 19811118; EP 0039794 B1 19830824; AT E4513 T1 19830915; DE 3018081 A1 19811119; DE 3160784 D1 19830929
DOCDB simple family (application)
EP 81102874 A 19810415; AT 81102874 T 19810415; DE 3018081 A 19800512; DE 3160784 T 19810415