Process for sizing paper and process for making plasterboard bas

Details Process for sizing paper and process for making plasterboard bas Process for sizing paper and process for making plasterboard bas

1982-09-07

1985-08-06

Chin, Peter

Paper making and fiber liberation

Processes and products

Multi-layer waterlaid webs or sheets

156 39, 156 41, 162128, 162135, 162158, 1621683, 4285375, 428703, D21H 102

Patent

active

045334340

ABSTRACT:
An improved sizing is feasible by adding into a papermaking pulp slurry an aqueous dispersion prepared by mixing an aqueous solution of an ampholytic acrylamide polymer having both cationic and anionic groups with a liquid substituted succinic anhydride or with an anhydrous liquid mixture of a liquid substituted succinic anhydride and an oil-in-water type surfactant. Such a paper sizing process is very useful for making plasterboard base paper of multilayered structure composed of at least one surface layer having a high hot water resistance and at least one back layer having a good adhesiveness to plaster slush.

REFERENCES:
patent: 3445330 (1969-05-01), Kulick et al.
patent: 4040900 (1977-08-01), Mazzerella et al.
patent: 4207142 (1980-06-01), Shepherd
patent: 4372814 (1983-02-01), Johnstone

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