International Paper Company

Alexander Sadle

Leroy C Hofmann

Thomas J Pratt

A novel carrier composition for corrugating adhesives contains 1 part amylaceous material, about 3 to 5 parts water, and about 0.5 to 4 parts urea. The carrier is self-gelling at room temperature, and lowers the gel temperature of the adhesive paste to within the optimal range for use in making corrugated paperboard. The carrier is especially well-suited for use in acidic adhesive systems since its effect on the gelatinization temperature of the raw starch component is independent of pH.

Starch carrier composition for adhesive containing urea as a

An aqueous acidic adhesive composition is described comprising starch, polyvinylacetate, a copolymer of vinylacetate and ethylene and, optionally, a water-resistant thermosetting resin such as urea-formaldehyde or melamine-formaldehyde. The adhesive is particularly useful as a corrugator adhesive in the preparation of corrugated paperboard which requires a high wet bond strength. Because of its excellent 'green bond' characteristics, the corrugators can be run at high speeds to produce a product having acceptable wet bond strengths with the important additional advantages that the bond is strong, tough and flexible.

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Morristown, NJ, United States of America

Alexander Sadle