| 摘要 |
<p>Thermosetting resinous adhesives, useful particularly as plywood or lumber laminating adhesives, comprise a phenol-, resorcinal-, urea-, or melamine-formaldehyde resin and an extender therefor. The extender comprises an aqueous cellulosic pulp used in relative proportions of from about 1-50 parts by weight extender for each 100 parts by weight resin, dry solids basis. Water is included in amount sufficient to impart to the compositions a viscosity of 1,000-12,000 centipoises. The cellulosic pulp extender preferably comprises the pulp mill paper making waste sludges containing the discarded cellulosic fines separated from the pulp products of the mill. Its inclusion has the effect of holding the water at the glue line and accordingly of improving significantly the assembly time characteristics of the adhesive.</p> |
