Hercules Corporation

Albert R Reid

Thomas G Majewicz

Carl A Lukach

Richard D Royce, Jr

New anianic, water-soluble cellulose ether derivatives, in particular, carboxymethyl hydrophobically modified hydroxyethylcellulose (CMHMHEC), which are useful as thickeners in aqueous solutions, e.g., water-based protective coating compositions such as latex paints, as well as aqueous solutions, including water-based protective coating compositions containing these ternary cellulose ethers as thickeners and protective coloids, are disclosed. The cellulose ether derivatives are characterized in that they have a Brookfield LVF Viscosity of about 5 centipoise to about 60,000 centipoise in a 1 weight % solution.

Carboxymethyl hydrophobically modified hydroxyethylcellulose

Disclosed are nonionic dihydroxypropyl hydroxyalkylcelluloses having a dihydroxypropyl M.S. of from about 0.1 to 1.2 and a hydroxyalkyl M.S. of from about 1.5 to about 3.0. The dihydroxypropyl hydroxyalkylcelluloses are capable of reacting with polyvalent metal cations, such as, titanium and zirconium, in an aqueous medium, such as a salt brine medium, to form viscoelastic gels useful in oil recovery operations.

Dihydroxypropyl mixed ether derivatives of cellulose

Products having high absorbency for use in absorbent dressings and the like are prepared by precipitating a water-insoluble but water-swellable superabsorbent polymer onto the surface of a long fiber cellulose from an aqueous slurry and drying the resulting coated fibers by dehydration with a water-miscible nonsolvent for the polymer.

Superabsorbent cellulosic fibers having a coating of a water insoluble,

Dihydroxypropyl ethers of cellulose are disclosed which are characterized by having a dihydroxypropyl M.S. of at least about 1.4 which are water-soluble and thermoplastic. These materials form complexes with borate and antimonate ions having unique and useful properties.

Dihydroxypropyl cellulose

Water-absorbent crosslinked polymers are improved in their wicking capacity by treatment of their surface with glyoxal. The polymer can be a polysaccharide--acrylamide graft copolymer or a polymer or copolymer of acrylamide and/or sodium acrylate or sodium methacrylate.

Absorption rate of absorbent polymers by treating with glyoxal

Modified polysaccharides having greatly increased water-absorbing and binding capacity are prepared by reacting a polysaccharide such as cellulose or starch in the presence of acrylamide, another vinyl monomer and a divinyl crosslinking monomer using free radical polymerization techniques. The product is believed to be a complex mixture of crosslinked grafted polysaccharide and acrylamide copolymers.

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Hockessin, DE, United States of America

Albert R Reid