Chevron Chemical Company LLC

Gulf Oil Corporation

Chevron Phillips Chemical Company LP

Chevron Research & Technology Company

Leslie P Theard

Ta Yen Ching

Victor P Kurkov

David Rosendale

James Hongxue Wang

Lewis R Compton

Tor H Palmgren

Mitchell P Eichelberger

William J Heilman

Steven P Current

Frank C Peterson

Mical C Renz

Kiyoshi Katsumoto

James E Wang

Disclosed is a process for esterifying and/or transesterifying a polymer having a polyethylenic backbone and pendant acid and/or ester moieties comprising contacting a melt of the polymer with a transesterifying compound so that the polymer undergoes esterification and/or transesterification but not alcoholysis. The esterified or transesterified polymer also has pendant ester moieties which differ in kind and/or number from the unreacted polymer. In one embodiment, the process also comprises adding an amount of a transition metal salt that is effective to promote oxygen scavenging. Also in a further embodiment, the process comprises irradiating the transesterified polymer with actinic radiation to reduce the induction period before oxygen scavenging commences. Also disclosed are compositions comprising a component which comprises an ethylenic or polyethylenic backbone and a pendant or terminal moiety comprising a benzylic, allylic, or ether-containing radical. The invention also embodies new polyethylenic oxygen scavenging compositions comprising a transition-metal salt and the above component. Methods of making the compositions, and methods and compositions using the ethylenic or polyethylenic compositions, are disclosed.

Compositions having ethylenic backbone and benzylic, allylic, or ether-containing side-chains, oxygen scavenging compositions containing same, and process for making these compositions by esterification or transesterification of a polymer melt

Compositions having ethylenic backbone and benzylic, allylic, or

A process for the production of an ionomers containing ethylenically-unsaturated structural units comprising contacting:

Process for producing ionomers employing ethylene terpolymers

Compositions having ethylenic backbone and benzylic allylic or

An improved oxygen scavenging system is provided. The system involves an oxygen scavenging phase containing at least one oxygen-scavenger and a second phase comprising at least one catalyst effective in catalyzing a scavenging reaction. The oxygen scavenging phase is substantially devoid of any catalyst of the scavenging reaction and the second phase is effectively separate from the oxygen scavenging phase. Nevertheless, the oxygen scavenging system provides excellent scavenging capabilities while avoiding many of the prior art problems, such as undesired oxidation during high temperature processing when the system is incorporated into a multi-layer film.

Multi-component oxygen scavenger system useful in film packaging

Ionomer compositions which have improved optical properties are disclosed. These compositions comprise ionomers which can be represented as the polymerization product of alpha-olefins having from two to eight carbon atoms, esters of alpha, beta-ethylenically-unsaturated carboxylic acids, metal salts of acrylic and methacrylic acid, and optional alpha, beta-ethylenically-unsaturated comonomers which impart some desired polymer property or properties, such as acidity and/or solvent resistivity. Also disclosed are methods of making these ionomer compositions in a reactive extruder and treating the compositions with acid to impart acidity to the compositions or to only the surface of the compositions.

Low-haze ionomers of copolymers of alpha-olefins, carboxylic acid

Low-haze ionomers of copolymers of .alpha.-olefins, carboxylic acid

A continuous process for the aminolysis of polymers produced from ethylenically unsaturated structural units comprising contacting, in a reaction vessel,

Continuous process for the aminolysis of ethylene copolymers

Disclosed is a method for saponifying an ethylene-alkyl acrylate copolymer comprising mixing together an ethylene-alkyl acrylate copolymer and an aqueous solution of an inorganic alkali metal base at a temperature sufficient for saponification to take place and at which the ethylene-alkyl acrylate copolymer undergoes a phase change.

Ethylene-alkyl acrylate copolymer saponification process

Growing community of inventors

Houston, TX, United States of America

Leslie P Theard