초록 ▼

A process for preparation of crosslinked cellulosic products containing at least 30 wt. % cellulosic fibers and the polyanhydride crosslinked cellulosic products resulting therefrom wherein a cellulosic material is treated with an aqueous solution of a polycarboxylic acid formed by hydrolysis of a p

A process for preparation of crosslinked cellulosic products containing at least 30 wt. % cellulosic fibers and the polyanhydride crosslinked cellulosic products resulting therefrom wherein a cellulosic material is treated with an aqueous solution of a polycarboxylic acid formed by hydrolysis of a polyanhydride of the structure [ STR 1 ] which comprises the reaction product of trimellitic anhydride and a diol in the mole ratio of from about 2.0:0.9 to about 2.0:1.1, wherein R is selected from the group consisting of alkyl, alkylene and cycloalkylene moieties of up to 12 carbon atoms and ethylene oxide and propylene oxide moieties of molecular weight up to about 6000, wherein said cellulosic material is impregnated with an aqueous solution of said polyanhydride, dried, and heated to a temperature of from about 120.degree. C. to about 200.degree. C. at ambient pressure to obtain crosslinking of the cellulose fibers with the said polyanhydride by an ester bond between the hydroxyl groups of the cellulosic fibers and the anhydride groups of the anhydride. Fibrous cellulosic products are readily repulped paper with improved wet strength, pulp fluff with improved wet resilience, wood oriented strand board with improved moisture resistance, and textile products with improved durable press and reduced shrink characteristics.

대표청구항 ▼

[ That which is claimed is:] [1.] A cellulose crosslinking composition comprising an aqueous solution containing at least 0.5 weight percent of a hydrolyzed reaction product of trimellitic anhydride and at least one diol in a mole ratio of from about 2.0:0.6 to about 2.0:1.5, wherein said hydrolyzed

[ That which is claimed is:] [1.] A cellulose crosslinking composition comprising an aqueous solution containing at least 0.5 weight percent of a hydrolyzed reaction product of trimellitic anhydride and at least one diol in a mole ratio of from about 2.0:0.6 to about 2.0:1.5, wherein said hydrolyzed reaction product comprises:a) a polycarboxylic acid formed by hydrolysis of an alkyl glycol bis(anhydrotrimellitate) as a polyanhydride of the structure [ STR 7 ] wherein R is selected from the group consisting of alkyl, alkylene and cycloalkylene moieties of up to 30 carbon atoms, ethylene oxide moieties of molecular weight up to about 6000, and propylene oxide moieties of molecular weight up to about 6000; andb) at least one oligomer represented by the formula T.sub.n+1 D.sub.n, wherein T is that part of the oligomer molecule which is derived from trimellitic anhydride and D is that part of the oligomer molecule which is derived from a diol and wherein n is an integer of from 2 to 12.