D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
9/59
D21H 17/33 (2006.01) C08F 279/02 (2006.01) D21H 17/34 (2006.01) D21H 17/43 (2006.01) D21H 17/45 (2006.01)
Patent
CA 2009950
Disclosed are a papermaking method of preparing a paper having a reinforced strength wherein a polymer latex is added to a paper stock in an amount of from 2.5 to 30 % by weight. The polymer latex is prepared by neutralizing a seed polymer with an acid or a salt or by quaternizing it with a quaternizing agent. The surfaces of the emulsion grains are highly densely cationated. The seed polymer is formed by adding a monomer as represented by the following formula (I) or a mixture of the monomer (I) and copolymerizable ethylenic unsaturated monomer(s) (II) to a seed latex of a carboxyl-modified synthetic rubber latex or synthetic resin emulsion and polymerizing them: Image ( I ) R1 represents H or CH3; R2 represents an alkylene group having from 2 to 5 carbon atoms; R3 and R4 each represent H or an alkyl group having from 1 to 5 carbon atoms; Image Image A represents or ; and R1, R3 and R4 are so selected that the monomer is hardly soluble or insoluble in water. The paper has a noticeably improved paper-strength.
Arai Takeo
Fujiyoshi Hitoshi
Shirota Masako
Watanabe Naotaka
Bereskin & Parr
Mitsui Cytec Ltd.
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