Vinylamine copolymer, flocculating agent and paper strength increasing agent using the same, as well as process for producing the same

USRE34903E · kind E · reissue

Assignee

• Mitsubishi Kasei Corporation · JP

Inventors

• Takaharu Itagaki · Yokohama, JP
• Mitsuaki Shiraga · Chiba, JP
• Shigeru Sawayama · Yokohama, JP
• Kohichi Satoh · Yokohama, JP

Key dates

• Filing date: Nov 8, 1993
• Grant date: Apr 11, 1995
• Expiry date: Nov 8, 2013

Classification

• Technology area (CPC —): General

Abstract

Disclosed herein is a vinylamine copolymer having the structural units represented by the following formulas (I), (II), (III).[.,.]. .Iadd.and .Iaddend.(IV) .[.and (VI).].: ##STR1## wherein x.crclbar. represents an anion or hydroxyl ion R represents a hydrogen atom or a methyl group, M.sym. represents a hydrogen ion or a monovalent cation, in which the molar fraction of the structural unit (I) is 5 to 85% by mole, the molar fraction of the structural unit (II) is 2 to 85% by mole, the molar fraction of the structural unit (III) is 5 to 80% by mole,.[.the molar fraction of the structural unit (IV) is 0 to 40% by mole,.]. all of said molar fractions being based on the vinylamine copolymer, and the molar fraction of the structural unit .[.(V).]. (.Iadd.IV) is 0 to 8% by mole which is based on the total content of the structural units (III).[.,.]. .Iadd.and .Iaddend.(IV), .[.and (V),.]. a flocculating agent and a paper strength increasing agent using the vinylamine copolymer, and a process for producing the vinylamine copolymer.