A highly absorbent resin which is essentially a polyamine-crosslinked, partial neutralization product obtained by reaction of an alkali metal hydroxide with a carboxyl-containing polymer selected from the froup consisting of alpha-olefin-maleic anhydride copolymers, vinyl compound-maleic anhydride copolymers, polyacrylic acid, polymethacrylic acid, and mixtures thereof, the degree of neutralization of the said neutralization product being 0.4 to 0.8 equivalent of total carboxyl groups of the said carboxyl-containing polymer, the amount of polyamine as a crosslinking agent being not more than 2 parts by weight per 100 parts by weight of the neutralization product on the uncrosslinked basis, the resin being capable of absorbing at least 20 times its own weight of distilled water. The resin has good resistance to heat and good durability in the hydrous condition.

Highly absorbent resin

Miscible blends of poly-2-oxazolines and thermoplastic polymers are disclosed herein. These blends exhibit a single glass transition point indicative of a miscible blend. The blends of this invention are useful as membranes, particularly separation membranes for mixtures of organic compounds or organic compounds and water and a perevaporation process.

Miscible polymer blends containing poly(2-alkyl-2-oxazoline)

An anti-fouling overcoating composition for watercraft or stationary underwater structures precoated with hard-surface leaching-type anti-fouling paint consists essentially of an aqueous solution or dispersion of a carboxylated hydrophilic acrylic copolymer, a cross-linking agent for the carboxylated hydrophilic copolymer, a polyalkylenepolyamine or a hydrophilic polyalkylenepolyamine derivative and an effective amount of an ultraviolet-absorbing agent.

Anti-fouling overcoating composition and use thereof

An anti-fouling overcoating composition for watercraft or stationary underwater structures precoated with hard-surface leaching-type anti-fouling paint consists essentially of an aqueous solution or dispersion of a carboxylated hydrophilic acrylic polymer, a cross-linking agent for the carboxylated hydrophilic polymer, polyethylenimine or a hydrophilic polyethylenimine derivative and an effective amount of an ultraviolet-absorbing agent.

Method of reducing fouling of marine structures and coated structure thereof

A process for modifying a surface of an article that includes treating a surface with a solution that includes an organic solvent, and the reaction product of a substantially water insoluble polymer and a polyalkylene imine to form a modified surface. Additionally, a biologically active agent such as an anti-thrombotic agent may be attached to the modified surface.

Process for modifiying surfaces using the reaction product of a water-insoluble polymer and a polyalklene imine

POLYMER COMPOSITIONS SHOWING SELECTIVE PERMEABILITY FOR GAS AND WATER VAPORS ARE PREPARED THROUGH INTIMATE ADMIXTURE OF A POLYACRYLIC RESIN WITH A POLYETHYLENIMINE IN A WEIGHT RATIO OF FROM ABOUT 5:1 TO ABOUT 2:1 RESPECTIVELY, AND CROSS-LINKING THE RESULTANT MIXTURE. THE POLYACRYLIC RESIN IS PEDOMINANTLY COMPOSED OF MONOMER UNSATURATED MONOMERS SUCH AS ACRYLIC, ACID, METHACRYLIC UNSATURATED MONOMERS SUCH AS ACRYLIC, ACID, METHACRYLIC ACID, ITACONIC ACID, THE ESTERS THEREOF, THE AMIDES THREOF AND THE NITRILES THEREOF. THE POLYETHYLENIMINE CAN BE UNSUBSTITUTED OR SUBSTITUTED ON THE IMINE GROUP BY ALKYL, HYDROXYLALKYL, HYDROXYCHLOROALKYL, HYDROXYSULFOALKYL, EPOXYALKYL, PHENYLALKYL, CYANOALKYL OR CARBAMYL GROUPS. AT LEAST THE POLYETHYLENIMIBNE COMPONENT OF THE COMPOSITION IS CROSS-LINKED, EITHER INTERNALLHY THROUGH THE USE OF AN AGENT SUCH AS ZINC AMMONIUM CARBONATE OR THROUGH ADDITION OF A CROSS-LINKING AGENT SUCH AS AN EPOXIDE.

N Vassileff

Papers

Composition containing an acrylic resin,a polyethyleneimine,and a polyepoxide