公开(公告)号：EP2766403A2

公开(公告)日：2014-08-20

申请号：EP12772320.3

申请日：2012-10-11

Applicant: BASF SE

Inventor： CIMPEANU, Carmen-Elena ,  KERN, Holger ,  ARNOLD, Petra ,  HAMERS, Christoph

IPC: C08F212/08 ,  C08F2/24 ,  C08F220/16 ,  D21H17/34 ,  D21H21/16 ,  D21H17/28

CPC classification number: D21H21/16 ,  C08F2/24 ,  C08F2/26 ,  C08F212/08 ,  C08F220/18 ,  C08F251/00 ,  D21H17/28 ,  D21H17/34 ,  D21H19/20 ,  C08F2220/1825 ,  C08F236/20 ,  C08F2/44

Abstract: A finely divided, starch-containing polymer dispersion which is obtainable by free radical emulsion polymerization of ethylenically unsaturated monomers in the presence of at least one redox initiator and starch, wherein (a) from 0 to less than 40% by weight of at least one optionally substituted styrene, (b) from greater than 60 to 100% by weight of at least one C
1 -C
12 -alkyl acrylate and/or C
1 -C
12 -alkyl methacrylate, (c) from 0 to 10% by weight of at least one other ethylenically unsaturated copolymerizable monomer, are used as the ethylenically unsaturated monomers, the sum (a) + (b) + (c) being 100% and being based on the active monomer content and (d) from 15 to 40% by weight of at least one degraded starch which has a molar mass M
w of from 1000 to 65 000 g/mol, based on the total weight of solids content of components (a) + (b) + (c) + (d), are used as the starch, and the polymerization being carried out in the presence of at least 0.01% by weight, based on the monomers used, of at least one terpene containing chain-transfer agent, and in which the polymer dispersion optionally comprises an aluminium compound. The use of the finely divided, starch-containing polymer dispersions as sizes for paper, board and cardboard is also claimed.