Isp Investments Inc.

Jeffrey A Lynn

Krystyna Plochocka

Russell B Biss

Jeffrey M Cohen

John N Zamora

Osama M Musa

Mohand Melbouci

Cuiyue Lei

Janice Jianzhao Wang

Musa M Osama

Stable water based High-Temperature-High-Pressure (HTHP) and/or Non-HTHP crosslinked copolymers for oil and gas applications consist of (i) a crosslinked, linear polyvinyl amide/polymerizable carboxylic acid) copolymer, having a composition, by weight, of 25-75 wt. % of a vinyl amide monomer selected from vinyl pyrrolidone, vinyl caprolactam, N-vinyl-N-methylacetamide and mixtures thereof, and 25-75 wt. % of a polymerizable carboxylic acid monomer selected from acrylic acid, (meth)acrylic acid, crotonic acid, itaconic acid, maleic acid and mixture thereof; and (ii) a crosslinker in an amount of 0.01-5% based on weight of total monomers. Also discloses relevant compositions comprising said copolymer and method of use thereof.

High-temperature high-pressure (HTHP) stable synthetic polymer for water based oil-well servicing fluids

What is described is a polymeric hydrogel of a polymeric anhydride or acid, e.g. maleic anhydride or maleic acid polymer, or copolymer thereof, crosslinked with a crosslinking agent containing at least 2 crosslinkable groups, particularly, &mdash;OH or &mdash;NH , or both. The reaction product is a crosslinked polymeric ester or amide/imide, or both, suitably having a mole ratio of &mdash;OH, or &mdash;NH , to &mdash;COOH, of 1:10 to 10:1, preferably 2:10 to 7:1. The hydrogel is particularly swellable in water, e.g. >100% in 1 hour in aqueous media; and forms a thin, tacky layer on a substrate, which property is useful in bioadhesive products.

Polymeric hydrogels

A continuous, solvent-free process for obtaining solvent-free, fine white powders of high molecular weight alternating copolymers of maleic anhydride and a C -C alkyl vinyl ether, without odor or taste, having the molecular structure (A&mdash;B) , where A is maleic anhydride, B is an alkyl vinyl ether and n is an integer indicative of the molecular weight of the copolymer, which comprises feeding alkyl vinyl ether as reactant and solvent in excess over the desired 1:1 mole ratio of A:B in the copolymer, molten maleic anhydride and a free radical initiator, continuously at predetermined feeding rates into a reactor heated at a reaction temperature of about 50&deg; to 100&deg; C., charging the reactor and withdrawing reaction product, residual alkyl vinyl ether and initiator from the reactor at the same rate as the feed rate of reactants into the reactor simultaneously thereby maintaining a constant volume in the reactor, stripping residual alkyl vinyl ether from the reaction product, drying the copolymer obtained of any remaining traces of alkyl vinyl ether, and recycling recovered alkyl vinyl ether back into reactor as reactant and solvent.

Continuous, solvent-free process for making copolymers of maleic anhydride and C1&minus;4 alkyl vinyl ether

A continuous, solvent-free process for obtaining solvent-free, fine white powders of high molecular weight alternating terpolymers of maleic anhydride, a C -C alkyl vinyl ether and isobutylene, without odor or taste.

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West Milford, NJ, United States of America

Jeffrey A Lynn