E.i. Dupont De Nemours and Company

Other

Leo Ojakaar

Anestis L Logothetis

Joseph B Finlay

Kenneth A Senior

David P Kitto

Russell W Schnell

Perfluoroelastomer compositions having high loadings of large-particle size carbon black exhibit superior performance at very high temperature.

Heat-resistant perfluoroelastomer composition

Perfluoroelastomer compositions containing high molecular weight perfluoropolyether exhibit improved low temperature properties.

Low temperature 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

Cured perfluoroelastomer, including rod stock, can be spliced using perfluoropolymer bonding agents in conjunction with moderate pressure and concentrated heat.

Bonding of perfluoroelastomers

Perfluoroelastomers of tetrafluoroethylene, perfluoro (alkylvinylether) and a cure site monomer crosslinked with organic peroxide curing agent, and a process for their preparation.

Cured perfluoroelastomers and their preparation

A peroxide-curable fluoroelastomer composition which can be readily removed from a mold cavity without tearing which comprises a fluoroelastomer whose interpolymerized units consist essentially of units of tetrafluoroethylene, units of perfluoroalkyl perfluorovinyl ether, units of a bromine-containing olefin and, optionally, units of ethylene, and from about 0.05-2 parts per 100 parts fluoroelastomer of an N,N,N',N'-tetrasubstituted 1,8-diaminonaphthalene having the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently alkyl groups of 1-6 carbon atoms, phenyl or benzyl, R.sub.1 and R.sub.2 and/or R.sub.3 and R.sub.4 can be joined to form a 5- or 6-membered heterocyclic ring in which a carbon atom can be replaced by an oxygen or a sulfur atom, R.sub.1 and R.sub.3 and/or R.sub.2 and R.sub.4 can be joined to form a heterocyclic ring of 6-20 carbon atoms in which a carbon atom can be replaced by an oxygen or a sulfur atom, X and Y are independently an alkyl group or an alkoxy group containing 1-4 carbon atoms and n is 0-3.

Peroxide-curable brominated fluoroelastomer composition containing an

A peroxide curable fluoroelastomer composition wherein the composition comprises a tetrapolymer whose interpolymerized units consist essentially of units derived from: (1) about 30-40 weight percent vinylidene fluoride, (2) about 30-40 weight percent of the fluorine-containing monomers hexafluoropropylene or pentafluoropropylene, (3) about 25-35 weight percent tetrafluoroethylene and (4) up to 3 mole percent of units, based upon the tetrapolymer, derived from a bromine-containing olefin, with the proviso that enough of such units are present to provide 0.05 weight percent bromine in the tetrapolymer, the units of the bromine-containing olefin are derived from a compound having the formula CX.sub.2 .dbd.CX(CY.sub.2).sub.n (CZ.sub.2).sub.2 Br where X is hydrogen or fluorine, Y is hydrogen, fluorine or chlorine, Z is fluorine or chlorine and n is 0-5 and said fluoroelastomer composition contains at least 1 part per hundred parts tetrapolymer of trimethallylisocyanurate.

Fluoroelastomer having improved compression set resistance

A peroxide-curable fluoroelastomer composition which comprises a fluoroelastomer whose interpolymerized units consist essentially of units derived from vinylidene fluoride, units derived from at least one other fluorine-containing monomer copolymerizable therewith, said monomer being a compound which contains 2-7 carbon atoms, contains no bromine atoms or iodine atoms, and contains at least as many fluorine atoms as carbon atoms, and said fluoroelastomer contains up to 3 mole percent of units derived from a bromine-containing olefin or 0.1-2 mole percent of units derived from an iodine-containing olefin, and from about 0.05-2 parts per 100 parts fluoroelastomer of an N,N,N',N'-tetrasubstituted 1,8-diaminonaphthalene having the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently alkyl groups of 1-6 carbon atoms, phenyl or benzyl, R.sub.1 and R.sub.2 and/or R.sub.3 and R.sub.4 can be joined to form a 5- or 6-membered heterocyclic ring in which a carbon atom can be replaced by an oxygen or a sulfur atom, R.sub.1 and R.sub.3 and/or R.sub.2 and R.sub.4 can be joined to form a heterocyclic ring of 6-20 carbon atoms in which a carbon atom can be replaced by an oxygen or a sulfur atom, X and Y are independently an alkyl group or an alkoxy group containing 1-4 carbon atoms and n is 0-3.

Peroxide-curable brominated or iodinated fluoroelastomer composition

White and colored tire sidewalls are made by fabricating a tire having a concentric groove on at least one sidewall and, after cleaning the groove and coating it with adhesive, filling the groove with a polyurethane composition based on 4,4'-methylenebis(cyclohexyl isocyanate) and one or more polyols, said composition also containing an adduct of an aliphatic diisocyanate with N-(t-butyl)diethanolamine and bis(2,2',6,6'-tetramethyl-4-piperidine) sebacate, then curing the composition at an elevated temperature. Pigmented sidewalls of this invention have high light and weather resistance and an exceptional resistance to contact staining.

Polyurethane compositions for tire sidewalls and composite articles

Mixtures of compounds having the formula ##EQU1## where Y is an alkyl triprimary oxy radical, Ar is a divalent radical containing an aromatic nucleus, X is aryloxy or alkoxy, B is dialkylamino or lactam-N-yl, Q is 0, 1, 2 or 3, which may be dissolved in compatible solvents and mixed with suitable catalysts and used as a coating material on organic polymers such as polyester to enhance adhesion between the substrate and a subsequently applied organic polymer such as an elastomeric polymer.

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Hockessin, DE, United States of America

Leo Ojakaar