Papermaking method

Details Papermaking method Papermaking method

1990-02-16

1991-12-03

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

1621683, 162169, D21H 1744

Patent

active

050697544

ABSTRACT:
A 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 provided with a large number of cationic groups. The seed polymer is formed by adding a monomer 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: ##STR1## R.sub.1 represents H or CH.sub.3 ; R.sub.2 represents an alkylene group having from 2 to 5 carbon atoms;

REFERENCES:
patent: 2668111 (1954-02-01), Lindquist
patent: 4187142 (1980-02-01), Pickelman et al.
patent: 4189345 (1980-02-01), Foster et al.
patent: 4426470 (1984-01-01), Wessling et al.
patent: 4806591 (1989-02-01), Probst et al.

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