E.i. Dupont De Nemours and Company

Other

E. I. Du Pont De Nemours

Anestis L Logothetis

Ming-Hong Hung

Charles W Stewart, Sr

John Michael Legare

Zhen-Yu Yang

Duck Joo Yang

Walter Werner Schmiegel

Leo Ojakaar

Martin Gerald Wagner

Jerome T Adams

Mureo Kaku

Nevio Anthony Marini, Iii

Iodonitriles as chain transfer agents in the manufacture of

This invention concerns a process for fluorinating a perfluoroelastomer which has previously been crosslinked by exposure to ionizing radiation. The resulting product has reduced outgassing. This makes perfluoroelastomer parts that have undergone the process particularly useful in clean rooms and for semiconductor manufacturing.

Fluorination of radiation crosslinked perfluoroelastomers

A process for preparing perfluoroelastomer compositions which comprise perfluoroelastomers having a plurality of nitrile groups and a plurality of carboxyl-containing groups, carboxylate-containing groups, carboxamide groups, or mixtures thereof is provided. Such compositions cure rapidly in the presence of organotin compounds.

Fast-curing perfluoroelastomer composition

Curable perfluoroelastomer compositions are provided which comprises a perfluoroelastomer, a curative, and an organic or inorganic ammonium salt which decomposes between 120.degree.-225.degree. C.

Perfluoroelastomer composition having enhanced curing performance

Blends of a perfluoroelastomer with a nitrile containing polyperfluoroether are described. The addition of the polyperfluoroether often improves the properties, processability and/or low temperature properties of the perfluoroelastomer. It is preferred if the perfluoroelastomer contains nitrile groups so that the two polymers can cocure, thereby retarding separation of the polyperfluoroether from the perfluoroelastomer.

Nitrile containing perfluoropolyether-perfluoroelastomer blends

Nitrile containing perfluoroelastomers are cured by a combination of a peroxide, a coagent, and a catalyst which causes crosslinks to form using the nitrile groups. The method is relatively fast and economical, and gives vulcanizates which have excellent high temperature properties. Triphenyltin hydroxide is an exceptionally good catalyst for the formation of crosslinks from nitrile groups in perfluoroelastomers.

Perfluoroelastomer curing

Perfluoroelastomers cured by radiation and characterized by an absence of curing agent residues in the cured product.

Radiation curing of perfluoroelastomers

Perfluoroelastomers characterized by low molecular weight and freedom form color-forming impurities can be prepared by pyrolysis techniques, and are useful in pellicle coatings and other optical applications.

Soluble perfluoroelastomers

A novel process for making fluoropolymer-fiber composites is disclosed, which produces composites with improved physical properties. The composites are useful in parts that require chemical and/or thermal stability, as in chemical process equipment.

Process for making fluoropolymer composites

Pellicles having films bearing at least one coating of perfluoropolymers as an antireflective surface, the perfluoropolymers comprising a low molecular weight perfluoropolymer having randomly copolymerized units of tetrafluoroethylene, perfluoro (alkyl vinyl) ether and a cure site monomer, the cure site monomer selected from the group consisting of vinylidene fluoride, perfluoro-(8-cyano-5-methyl-3,6-dioxa-1-octene), bromotetrafluorobutene or perfluoro (2-phenoxypropyl vinyl ether). Pellicles of this type are dust defocusing covers for photomasks and reticles used to project patterns onto light sensitive substrates such as photoresist-coated semiconductor wafers which are used in the manufacture of integrated circuits.

Perfluoropolymer coated pellicle

A melt-processable thermoplastic composition consisting essentially of a blend of a melt processable thermoplastic fluorocarbon polymer and about 0.05 to about 0.5 percent by weight of an elastomeric copolymer of tetrafluoroethylene and a perfluoro(alkyl vinyl ether) exhibits improved processing properties.

Melt processable TFE copolymers with improved processability

In the preparation of perfluoropolymers by the interpolymerization of tetrofluoroethylene, perfluro (alkyl vinyl) ether and cyano-cure site monomer, the improvement of incorporating iodo moieties by the reaction of iodo-compounds of the formula RI.sub.n, in which R is a hydrocarbon or halocarbon radical of 1 to 8 carbon atoms and n is 1 or 2.

Preparation of cyano-containing perfluoropolymers having iodine curesites

A process for the preparation of perfluoropolymer by the random interpolymerization of tetrafluoroethylene, perfluoro (alkyl vinyl) ether and bromo curesite reactant, and the improvement wherein the interpolymerization reactants further comprise compounds of the formula RI.sub.n, in which R is a hydrocarbon or halocarbon radical and n is 1 or 2.

Preparation of bromo-containing perfluoropolymers having iodine curesites

Perfluoropolymers prepared from tetrofluoroethylene, perfluro (alkyl vinyl) ether and cyano-cure site monomer, and further comprising iodo moieties, and cured elastomers prepared from the perfluoropolymers.

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Wilmington, DE, United States of America

Anestis L Logothetis