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1. (WO2018178255) A SURFACE SIZING COMPOSITION, METHOD OF PRODUCTION, AND USE THEREOF

Pub. No.:    WO/2018/178255    International Application No.:    PCT/EP2018/058117
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Fri Mar 30 01:59:59 CEST 2018
IPC: D21H 17/35
D21H 17/36
D21H 17/37
D21H 17/66
D21H 19/20
D21H 19/22
D21H 19/64
D21H 21/16
Applicants: KEMIRA OYJ
Inventors: LEPO, Anneli
TURKKI, Tarja
TURUNEN, Elsi
Title: A SURFACE SIZING COMPOSITION, METHOD OF PRODUCTION, AND USE THEREOF
Abstract:
The present invention relates to a surface sizing composition comprising a metal salt, wherein the metal has at least 3 valence electrons, and an aqueous polymer dispersion, wherein the aqueous polymer dispersion is an aqueous polymer dispersion (A) obtainable by free radical emulsion copolymerizing a first ethylenically unsaturated monomer blend comprising (a) 0 to 75 % by weight of at least one optionally substituted styrene, (b) 15 to 100 % by weight of at least one C1-C4-alkyl (meth)acrylate, and (c) 0 to 10% by weight of other ethylenically unsaturated copolymerizable monomers, wherein the sum (a)+(b)+(c) is 100%, in the presence of a water-soluble redox system comprising a first free radical initiator for the free radical emulsion copolymerization and an aqueous prepolymer composition (B) obtainable by free radical emulsion copolymerizing in a polymerization solvent comprising C1-6- carboxylic acid and C1-6-carboxylic acid anhydride, a second ethylenically unsaturated monomer blend comprising (i) 5 to 50 % by weight of at least one ethylenically unsaturated quaternary amine selected from quaternary salt of N,N,N-tri(C1-4-alkyl)amino C1-4-alkyl(meth)acrylate with a mineral acid or an organic acid and/or quaternary salt of N,N,N-tri(C1-4-alkyl)amino C1-4-alkyl(meth)acrylamide with a mineral acid or an organic acid, (ii) 0 to 40 %, preferably 0 %, by weight of at least one ethylenically unsaturated tertiary amine selected from N,N-di(C1-4-alkyl)amino C1-4- alkyl(meth)acrylate and/or N,N-di(C1-4-alkyl)amino C1-4- alkyl(meth)acrylamide, (iii) 10 to 95 % by weight of at least one optionally substituted styrene, (iv) 0 to 50% by weight of at least one C1-C4-alkyl (meth)acrylate, and (v) 0 to 10% by weight of other ethylenically unsaturated copolymerizable monomers, wherein the sum (i)+(ii)+(iii)+(iv)+(v) is 100%, in the presence of a second free radical initiator, and adding water to the obtained polymer dispersion to obtain the aqueous prepolymer composition. The present invention further relates to production thereof and use on cellulosic materials.