Absorbent product including grafted insolubilized cellulose ether
AssigneePersonal Products Company
InventorsPronoy K. Chatterjee, Robert F. Schwenker, Jr.
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Abstract
An insoluble etherified cellulose graft copolymer is provided comprising etherified cellulose which is soluble in water in the absence of grafting and is chosen from the group consisting of the alkali metal salts of carboxyalkyl cellulose, sulfoalkyl cellulose and phosphonoalkyl cellulose. The etherified cellulose has grafted onto its cellulose backbone side chains of polymer moieties in sufficient quantities to render the grafted etherified cellulose insoluble. The products of this invention are used alone or mixed with other absorbent materials such as unmodified cellulose, in the manufacture of absorbent napkins, tampons, sponges and the like.
Claims18
An improvement in an absorbent product for absorbing body fluids comprising water-insoluble, cellulose ether selected from the group consisting of carboxyalkyl cellulose, sulfoalkyl cellulose and phosphonoalkyl cellulose;
- said ether having a degree of substitution ranging from about 0.4 to about 1.3 average number of ether groups per anhydroglucose unit;
- the improvement comprising said ether having grafted onto its cellulose backbone side chains of hydrophilic polymer moieties in an amount which ranges from about 10 to about 90% by weight, based on the weight of the grafted cellulose ether and sufficient to render said grafted cellulose ether insoluble and to provide said grafted cellulose ether with an XOW in 1.5% by weight aqueous sodium chloride solution of at least 30.
An improvement in an absorbent product for absorbing body fluids comprising water-insoluble carboxyalkyl cellulose having a degree of substitution ranging from about 0.4 to about 1.3 average number of carboxyalkyl groups per anhydroglucose unit;
- the improvement comprising said carboxyalkyl cellulose having grafted unto its cellulos backbone side chains of hydrophilic polymer moieties in an amount which ranges from about 10.degree. to about 90.degree. by weight, based on the weight of the grafted carboxyalkyl cellulose and sufficient to render said grafted carboxyalkyl cellulose insoluble and to provide said grafted carboxyalkyl cellulose with an XOW in 1.5% by weight aqueous sodium chloride solution of at least 30.
Dependencies are inferred from the claim text.