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1. (WO2017037347) CORE/SHELL POLYMER PARTICLES AS SURFACE SIZING AGENTS

Pub. No.:    WO/2017/037347    International Application No.:    PCT/FI2016/050610
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Sat Sep 03 01:59:59 CEST 2016
IPC: C08L 33/08
C08L 33/10
C08L 33/20
C08L 25/14
D21H 21/16
D21H 21/54
D21H 23/22
C08F 2/20
C08F 20/18
C08F 220/44
C08F 212/08
C08F 20/14
C08F 220/16
C08L 3/02
C09D 133/08
D21H 19/22
Applicants: KEMIRA OYJ
Inventors: LEPO, Anneli
TURUNEN, Elsi
TURKKI, Tarja
ÜBERBACHER, Bernhard
Title: CORE/SHELL POLYMER PARTICLES AS SURFACE SIZING AGENTS
Abstract:
The present invention provides a core/shell polymer particle for surface sizing of cellulosic products, wherein the core polymer and the shell polymer of the core/shell polymer par- ticle are polymerized from monomers comprising at least 40%, by weight of monomers selected from branched C3-10- alkyl (meth)acrylate, styrene, linear C1-10-alkyl (meth)acry- late, and acrylonitrile, based on the total weight of the mon- omers of the core/shell polymer particle; provided that the polymer of the core/shell polymer particle comprises at least 40% by weight of branched C3-6-alkyl (meth)acrylate and at least 50% by combined weight of branched C3-10- alkyl (meth)acrylate and styrene, linear C1-10-alkyl (meth)acrylate, and/or acrylonitrile, based on the total weight of the monomers of the core/shell polymer particle.