Title:
PAPER PROCESSING AGENT
Document Type and Number:
Japanese Patent JP3532308
Kind Code:
B2
Abstract:
PURPOSE: To obtain a paper processing agent excellent in stability over a long period time, having such effects as to improve the physical properties (esp. stiffness) of paper, by adding a crosslinking agent to the main component, i.e., an acetoacetic ester group-contg. polyvinyl alcohol-based resin.
CONSTITUTION: A kneader is charged with polyvinyl alcohol-powder containing sodium acetate, which is then admixed with acetic acid to effect swelling of the powder; the temperature of the system is then raised under agitation and a mixture of diketene and acetic acid is dripped onto the system to proceed a reaction; after completing the reaction, the system is washed with methanol, and then dried to obtain a polyvinyl alcohol-based resin containing acetoacetic ester group with a sodium acetate content of ≤2 (pref. ≤0.5) wt.%, acetic acid content of ≤5 (pref. ≤2) wt.% and the weight ratio of the acetic acid to the sodium acetate of 0.01-100 (pref. 0.5-10). The resin is then formulated with a crosslinking agent such as glyoxal to obtain the objective paper processing agent. The pH value of a 4wt.% aqueous solution of the paper processing agent is adjusted to 3-6.5 (pref. 4-5) to prepare a coating liquid, which is applied to a paper substrate.
Inventors:
Kitagawa, Akio
Onmiyachi, Takahito
Onmiyachi, Takahito
Application Number:
JP17939095A
Publication Date:
May 31, 2004
Filing Date:
June 21, 1995
Export Citation:
Assignee:
NIPPON SYNTHETIC CHEM IND CO LTD:THE
International Classes:
C08K5/09; C08F16/02; C08F18/02; C08F216/06; C08F218/10; C08K5/098; C08L29/04; C09D129/04; D21H19/20; D21H19/60; (IPC1-7): D21H19/20; C08F216/06; C08F218/10; C08K5/098; C08L29/04; C09D129/04