Process for making paper

Details Process for making paper Process for making paper

D - Textiles, Paper

21

H

9/59

D21H 13/12 (2006.01) C08F 220/56 (2006.01)

Patent

CA 1286457

Abstract The present invention is directed to a process for papermaking which comprises forming a sheet in the presence of a neutral sizing agent and optionally a filler using as a paper quality improver a cationic polymer which is prepared by copolymerizing an acrylamide compound of the formula: CH2=C(R1)CONH2 wherein R1 is a hydrogen atom or methyl group, and an inorganic or organic acid salt of a diallylamine compound of the formula: [CH2=C(R2)CH2]2N-R3 wherein R2 is a hydrogen atom or methyl group, R3 is a hydrogen atom or an alkyl having 1 to 6 carbon atoms, in the presence or absence of a vinyl monomer copolymerizable with said acrylamide compound and/or said diallylamine compound salt. When the above paper quality improver is used, the yield per each additive particularly in the case of neutral or alkaline papermaking processes is excellent and hence the sizing properties are improved, and there is obtained a paper having improved paper strength.

532257

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