Oil-resistant and aging-resistant elastomers

Claim 2

A CURABLE BLEND OF

Claim 3

AN ETHYLENE CONTAINING POLYMER AND

Claim 4

AN ETHYLENE CONTAINING POLYMER AND

Claim 5

A BUTADIENE/ACRYLONITRILE POLYMER CONTAINING ABOUT 25-50 WEIGHT PERCENT OF ACRYLONITRILE, THE PROPORTION OF SAID BUTADIENE/ACRYLONITRILE POLYMER BEING 1-30 PARTS PER HUNDRED PARTS BY WEIGHT OF SAID ETHYLENE CONTAINING POLYMER; THE ETHYLENE CONTAINING POLYMER HAVING AT LEAST 3.6 MOLES OF ETHYLENE PER 1,000 GRAMS OF THE ETHYLENE CONTAINING POLYMER AND BEING SELECTED FROM THE GROUP CON SISTING OF: A. AN ETHYLENE/ALKYL ACRYLATE OR ETHYLENE/ALKYL METHACRYLATE COPOLYMER, WHEREIN THE ALKYL GROUP HAS 1-4 CARBON ATOMS; THE PROPORTION OF THE ACRYLIC ESTER BEING ABOUT 2.5-8 MOLES OF ESTER GROUPS PER KILOGRAM OF THE COPOLYMER; B. A TERPOLYMER OF ETHYLENE WITH AN ALKYL ACRYLATE OR METHACRYLATE WHEREIN THE ALKYL GROUP HAS 1-4 CARBON ATOMS, AND A THIRD MONOMER SELECTED FROM THE GROUP CONSISTING OF: I. A C1-C12 ALKYL MONOESTER OR DIESTER OF A BUTENEDIOLE ACID, II. ACRYLIC ACID III. METHACRYLIC ACID, IV. CARBON MONOXIDE, V. ACRYLONITRILE, VI. A VINYL ESTER, VII. AN ALKYL ACRYLATE OR METHYLACRYLATE WHEREIN THE ALKYL GROUP HAS AT LEAST FIVE CARBON ATOMS, AND VIII. MALEIC ANHYDRIDE, THE PROPORTION OF THE ACRYLIC ESTER BEING EQUIVALENT TO 2.5-8.0 MOLES OF ESTER GROUPS PER KILOGRAM OF THE POLYMER, AND THE PROPORTION OF THE THIRD MONOMER BEING NO HIGHER THAN ABOUT 10 WEIGHT PERCENT OF THE POLYMER.

Claim 6

A BUTADIENE/ACRYLONITRILE POLYMER CONTAINING ABOUT 25-50 WEIGHT PERCENT OF ACRYLONITRILE, THE PROPORTION OF SAID BUTADIENE/ACRYLONITRILE POLYMER BEING 1-30 PARTS PER HUNDRED PARTS BY WEIGHT OF SAID ETHYLENE CONTAINING POLYMER; THE ETHYLENE CONTAINING POLYMER HAVING AT LEAST 3.6 MOLES OF ETHYLENE PER 1,000 GRAMS OF THE ETHYLENE CONTAINING POLYMER AND BEING SELECTED FROM THE GROUP CON SISTING OF: A. AN ETHYLENE/ALKYL ACRYLATE OR ETHYLENE/ALKYL METHACRYLATE COPOLYMER, WHEREIN THE ALKYL GROUP HAS 1-4 CARBON ATOMS; THE PROPORTION OF THE ACRYLIC ESTER BEING ABOUT 2.5-8 MOLES OF ESTER GROUPS PER KILOGRAM OF THE COPOLYMER; B. A TERPOLYMER OF ETHYLENE WITH AN ALKYL ACRYLATE OR METHACRYLATE WHEREIN THE ALKYL GROUP HAS 1-4 CARBON ATOMS, AND A THIRD MONOMER SELECTED FROM THE GROUP CONSISTING OF: I. A C1-C12 ALKYL MONOESTER OR DIESTER OF A BUTENEDIOLE ACID, II. ACRYLIC ACID III. METHACRYLIC ACID, IV. CARBON MONOXIDE, V. ACRYLONITRILE, VI. A VINYL ESTER, VII. AN ALKYL ACRYLATE OR METHYLACRYLATE WHEREIN THE ALKYL GROUP HAS AT LEAST FIVE CARBON ATOMS, AND VIII. MALEIC ANHYDRIDE, THE PROPORTION OF THE ACRYLIC ESTER BEING EQUIVALENT TO 2.5-8.0 MOLES OF ESTER GROUPS PER KILOGRAM OF THE POLYMER, AND THE PROPORTION OF THE THIRD MONOMER BEING NO HIGHER THAN ABOUT 10 WEIGHT PERCENT OF THE POLYMER.

Claim 7

a butadiene/acrylonitrile polymer containing about 25-50 weight percent of acrylonitrile, the proportion of said butadiene/acrylonitrile polymer being 1-30 parts per hundred parts by weight of said ethylene containing polymer; the ethylene containing polymer having at least 3.6 moles of ethylene per 1,000 grams of the ethylene containing polymer and being selected from the group consisting of: a. an ethylene/alkyl acrylate or ethylene/alkyl methacrylate copolymer, wherein the alkyl group has 1-4 carbon atoms; the proportion of the acrylic ester being about 2.5-8 moles of ester groups per kilogram of the copolymer; b. a terpolymer of ethylene with an alkyl acrylate or methacrylate wherein the alkyl group has 1-4 carbon atoms, and a third monomer selected from the group consisting of: i. a C1-C12 alkyl monoester or diester of a butenedioic acid, ii. acrylic acid iii. methacrylic acid, iv. carbon monoxide, v. acrylonitrile, vi. a vinyl ester, vii. an alkyl acrylate or methacrylate wherein the alkyl group has at least five carbon atoms, and viii. maleic anhydride, the proportion of the acrylic ester being equivalent to 2.5-8.0 moles of ester groups per kilogram of the polymer, and the proportion of the third monomer being no higher than about 10 weight percent of the polymer.

Claim 8

a butadiene/acrylonitrile polymer containing about 25-50 weight percent of acrylonitrile, the proportion of said butadiene/acrylonitrile polymer being 1-30 parts per hundred parts by weight of said ethylene containing polymer; the ethylene containing polymer having at least 3.6 moles of ethylene per 1,000 grams of the ethylene containing polymer and being selected from the group consisting of: a. an ethylene/alkyl acrylate or ethylene/alkyl methacrylate copolymer, wherein the alkyl group has 1-4 carbon atoms; the proportion of the acrylic ester being about 2.5-8 moles of ester groups per kilogram of the copolymer; b. a terpolymer of ethylene with an alkyl acrylate or methacrylate wherein the alkyl group has 1-4 carbon atoms, and a third monomer selected from the group consisting of: i. a C1-C12 alkyl monoester or diester of a butenedioic acid, ii. acrylic acid iii. methacrylic acid, iv. carbon monoxide, v. acrylonitrile, vi. a vinyl ester, vii. an alkyl acrylate or methacrylate wherein the alkyl group has at least five carbon atoms, and viii. maleic anhydride, the proportion of the acrylic ester being equivalent to 2.5-8.0 moles of ester groups per kilogram of the polymer, and the proportion of the third monomer being no higher than about 10 weight percent of the polymer.

Claim 9

A blend of claim 1 wherein the proportion of acrylonitrile in the butadiene/acrylonitrile polymer is 25-41 weight percent.

Claim 10

A blend of claim 1 wherein the proportion of the butadiene/acrylonitrile polymer is 5-15 parts per hundred parts of the ethylene containing polymer.

Claim 11

A blend of claim 1 wherein the ethylene containing polymer contains acrylic ester and the acrylic ester content of the ethylene polymer is equivalent to 5-8 moles of ester groups per kilogram of the polymer.

Claim 12

A blend of claim 1 wherein the ethylene polymer is an ethylene/acrylic ester/butenedioic ester terpolymer.

Claim 13

A composition comprising a blend of claim 1, an antioxidant system, and a peroxide curing system; the proportion of the antioxidant system being about 0.1-5 parts per 100 parts by weight of polymer.

Claim 14

A composition of claim 6 wherein the peroxide curing system consists of a peroxide decomposing rapidly within the temperature range of 150*-250*C. and a coagent selected from the group consisting of N,N''-(m-phenylene) dimaleamide, trimethylolpropane trimethylacrylate, tetraallyloxyethane, triallyl cyanurate, tetramethylene acrylate, and polyethylene oxide glycol dimethacrylate.

Claim 15

A composition of claim 6 wherein the antioxidant system comprises a mixture of a phosphorus compound with a hindered phenolic antioxidant or an amine antioxidant, the weight ratio of the phenolic compound or amine to the phosphorus compound being about 0.5-3.

Claim 16

The composition of claim 8 wherein both the phenolic compound or amine and the phosphorus compound are present in about equal weights.

Claim 17

A composition of claim 6 also comprising 15-40 volume percent of a filler.

Claim 18

A composition of claim 10 wherein the proportion of the filler is 20-25 volume percent.

Claim 19

A vulcanized product obtained by heating a composition of claim 10 for 0.2-50.0 minutes at 150*-230*C.

Claim 20

A vulcanized product of claim 12 containing barium sulfate as the filler.

Claim 21

A vulcanized product of claim 12 containing silica and barium sulfate as the filler.

Claim 22

A vulcanized product of claim 12 wherein the antioxidant system consists essentially of tri(mixed mono and dinonylphenyl) phosphite in mixture with 4,4''-bis( Alpha , Alpha -dimethylbenzyl)diphenylamine or 4,4''-butylidenebis( Beta -t-butyl-m-cresol).