Thixotropic wood adhesive gel

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...

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Details

524 55, 524503, 524916, 4285371, C08L 2904

Patent

active

053067495

ABSTRACT:
A water based thixotropic adhesive gel is disclosed which comprises; an aqueous emulsion of polyvinyl acetate in an amount sufficient to form adhesive bonds on wood; partially hydrolyzed polyvinyl alcohol in an amount sufficient to provide wet tack of the adhesive; glyoxal in an amount sufficient to provide water resistance to the adhesive; and wood flour in an amount sufficient to increase the water resistance imparted by the glyoxal and to provide sanding and staining properties to the adhesive; and xanthan gum in an amount sufficient to provide a thixotropic index and viscosity allowing extrusion of the gel from a flexible dispenser having a dispensing opening of about 0.073 inches in diameter by applying finger-pressure to the dispenser while, upon extrusion, the gel forms a bead which does not run when applied in a horizontal line on wood in a vertical plane.

REFERENCES:
patent: 2510257 (1950-06-01), Robinson
patent: 3256221 (1966-06-01), Cooper
patent: 3442845 (1969-05-01), Columbus et al.
patent: 3676174 (1972-07-01), Spector
patent: 4251400 (1981-02-01), Columbus
patent: 4282120 (1981-08-01), Cisterni
patent: 4638022 (1987-01-01), Cope
patent: 4687793 (1987-08-01), Motegi et al.
patent: 4801631 (1989-01-01), Sachs et al.
The Handbook of Adhesives, Third Ed. I. Skeist, pp. 388-390; 394-395; and 398.
Keczan, Xanthan Gum, (Tech Bull DB-15) of Merck & Co.
Kelco Xanthan Gum, Third Ed. of Kelco, a division of Merck & Co.

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