Rubber material with barrier material made of cycloolefin copolymers
AssigneeBASF SE
InventorsKevin Müller, Stefan Dahmen
Life of this patent
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Abstract
A rubber material is described, modified with a barrier material in the form of a copolymer which can be produced via ring-opening metathesis polymerization of a) at least one olefin monomer selected from the group consisting of monocyclic olefin monomers having one or two endocyclic C—C double bonds and bicyclic olefin monomers having one endocyclic C—C double bond and b) at least one polycyclic olefin monomer having at least two C—C double bonds. The barrier material can be used to reduce the gas permeability of the rubber material.
Claims15
A rubber material modified with a barrier material in the form of a copolymer which can be produced via ring-opening metathesis polymerization of
- a) at least one olefin monomer selected from the group consisting of monocyclic olefin monomers having one or two endocyclic C—C double bonds and bicyclic olefin monomers having one endocyclic C—C double bond and
- b) at least one polycyclic olefin monomer having at least two C—C double bonds.
The rubber material according to the preceding claim, wherein the molar ratio of olefin monomers a) to polycyclic olefin monomers b) is from 99:1 to 15:85, preferably from 80:20 to 15:85.
The rubber material according to any of the preceding claims, wherein the ring strain of the olefin monomers a) is at least 2 kcal/mol and the polycyclic olefin monomers b) have been selected from bicyclic dienes having ring strain of at least 15 kcal/mol.
The rubber material according to any of the preceding claims, wherein the copolymer can be produced via ring-opening metathesis polymerization of cis-cyclooctene and dicyclopentadiene.
The rubber material according to any of the preceding claims, wherein the rubber constituents of the rubber material have been selected from diene rubber, natural rubber, butyl rubber, synthetic polyisoprene, polybutadiene, styrene-butadiene copolymer, isoprene-butadiene rubber, styrene-isoprene-butadiene rubber, acrylonitrile-butadiene rubber, ethylene-propylene rubber, and chloroprene rubber.
The rubber material according to any of the preceding claims, which is a constituent of a pneumatic tire.
The rubber material according to the preceding claim, which is an inner layer of a pneumatic tire or is a carcass of a pneumatic tire.
A pneumatic tire comprising rubber material according to any of the preceding claims.
The pneumatic tire according to the preceding claim, wherein the copolymer has been applied by one or more of the following methods:
- application on at least one portion of the surface or on the entire surface of the inner layer of the tire;
- introduction into the material of the inner layer of the tire;
- in the form of film, in the form of unsupported foil, or in the form of coating of a foil backing, where the films or foils can have been introduced in addition to a rubber-based inner layer of a tire or as replacement form for an inner layer of a tire, into the interior of a tire;
- in the form of binder or coating of a fiber cord insert of the pneumatic tire;
- in the form of laminate between two or more backing foils, where the laminate has been introduced into the interior of the tire.
A process for modifying a rubber material, where at least one copolymer is applied to the rubber material or is introduced into the rubber material, and the copolymer can be produced via ring-opening metathesis polymerization of
- a) at least one olefin monomer selected from the group consisting of monocyclic olefin monomers having one or two endocyclic C—C double bonds and bicyclic olefin monomers having one endocyclic C—C double bond and
- b) at least one polycyclic olefin monomer having at least two C—C double bonds.
The process according to the preceding claim, wherein the modification uses one or more of the following methods:
- impregnation, spraying, spreading, coating, calendering.
The process according to any of the preceding process claims, wherein the copolymer is applied in the form of an aqueous dispersion of the copolymer and a film is formed via drying of the dispersion on the backing substrate.
The use of a copolymer for reducing the gas permeability of rubber material, where the copolymer can be produced via ring-opening metathesis polymerization of
- a) at least one olefin monomer selected from the group consisting of monocyclic olefin monomers having one or two endocyclic C—C double bonds and bicyclic olefin monomers having one endocyclic C—C double bond and
- b) at least one polycyclic olefin monomer having at least two C—C double bonds.
The use according to the preceding claim, wherein the copolymer is used in the form of an aqueous dispersion of the copolymer for producing a barrier film.
The use according to any of the preceding use claims, wherein the molar ratio of olefin monomers a) to polycyclic olefin monomers b) is from 80:20 to 15:85, and/or the layer thickness used of the copolymer is at least 1 μm.
Dependencies are inferred from the claim text.