Sizing agents in neutral range and sizing methods using the same

Details Sizing agents in neutral range and sizing methods using the same Sizing agents in neutral range and sizing methods using the same

1987-03-10

1989-06-27

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

162179, 162180, 106218, 106238, D21H 302

Patent

active

048426911

ABSTRACT:
This invention provides a sizing agent (A) to be used in neutral range in papermaking, the sizing agent being characterized in that it is an aqueous dispersion of a reaction product prepared by reacting, in a specific proportion, (i) a rosin compound and (ii) at least one polyhydric alcohol selected from among a trihydric alcohol and a tetrahydric alcohol both consisting of carbon, hydrogen and oxygen, and a sizing method using the sizing agent (A) in neutral range at a pH of about 6 to about 9 in papermaking. And this invention further provides a sizing agent (B) to be used in neutral range in papermaking, the sizing agent being characterized in that it is an aqueous dispersion of a reaction product prepared by reacting, in a specific proportion, (i) a rosin compound, (ii) at least one polyhydric alcohol selected from among a trihydric alcohol and a tetrahydric alcohol both consisting of carbon, hydrogen and oxygen and (iii) a .alpha.,.beta.-unsaturated carboxylic acid derivative, and a sizing method using the sizing agent (B) in neutral range at a pH of about 6 to about 9 in papermaking.

REFERENCES:
patent: 3044890 (1962-07-01), Boughton et al.
patent: 3251732 (1966-05-01), Aldrich
patent: 4591412 (1986-05-01), Hechler

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