Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With classifying – separating or screening of pulp
162 4, 162 5, 523218, 523219, 524270, 524271, 524272, 524274, D21C 908, C80J 932, C08L 9304, C08K 340
A low-density hot melt adhesive is disclosed. Low-density filler, preferably hollow glass microspheres, is added to a hot melt adhesive to provide a hot melt adhesive having a specific gravity preferably between 0.7 and 0.93. The low-density hot melt adhesive is more effectively separated from cellulosic materials such as cardboard and kraft paper during recycling operations which separate contaminants such as adhesives from cellulosic fibers based upon the density of the adhesive.
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"Reduce Part Weight and Cost With Hollow Microspheres for Plastics", by Dr. Elaine C. Barber, Senior Research Chemist, 3M Company, St. Paul, Minn., dated before Mar. 30, 1994, five pages.
"The Lightweight, High Strength Alternative", by 3M Company, St. Paul, Minn., dated before Mar. 30, 1994, two pages.
Szekely Peter A.
The Dexter Corporation
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