Process for preparing corrugated paperboard

Details Process for preparing corrugated paperboard Process for preparing corrugated paperboard

1982-09-02

1983-08-23

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

156328, 1563313, 156336, 156DIG66, 156DIG113, 523208, 106213, C09J 306, C08J 310, C08L 304, C08L 6102

Patent

active

044004800

ABSTRACT:
A crosslinking additive for imparting water resistance to starch-based corrugating adhesive compositions is prepared by reacting acetone and formaldehyde under aqueous alkaline conditions at 20.degree.-80.degree. C. in a molar ratio of 1 mole acetone to about 2 to 5.5 moles formaldehyde, adding to the reaction mixture at least an effective amount of dihydroxyethylene urea to scavenge the free formaldehyde in the mixture, and reacting until the amount of unreacted formaldehyde remaining is reduced to about 0.1-2%. The crosslinking additive thus obtained, which is low in free formaldehyde, may be added directly to a starch-based corrugating adhesive or may be first mixed with dimethylol dihydroxyethylene urea.

REFERENCES:
patent: 3019120 (1962-01-01), Bauer
patent: 3359223 (1967-12-01), Nakamura et al.
patent: 4018959 (1977-04-01), Demko et al.

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