# US 2020/0399497 A1 · Wire coat composition and a tire comprising a wire coat composition

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- Number: US 2020/0399497 A1
- Document ID: US20200399497A1
- Status: Published application
- Kind: A1
- Application number: 16/902,857
- Filed: 2020-06-16
- Published: 2020-12-24
- Earliest claimed: 2019-06-20
- Assignees: The Goodyear Tire & Rubber Company
- Applicants: The Goodyear Tire & Rubber Company
- Inventors: Carolin Anna Welter; Jean-Claude Knepper; Dawn Michelle Johnson; Betul Buehler
- Web page: https://patentgrep.com/patent/US20200399497A1

## CPC

- B60C 1/0041: {Compositions of the carcass layers}
- C09D 107/00: Coating compositions based on natural rubber
- B60C 9/0007: {Reinforcements made of metallic elements, e.g. cords, yarns, filaments or fibres made from metal}
- C08K 3/013: Fillers, pigments or reinforcing additives
- C08K 3/04: Carbon
- C08K 3/06: Sulfur
- C08K 3/11: Compounds containing metals of Groups 4 to 10 or of Groups 14 to 16 of the Periodic Table
- C08K 3/22: of metals
- C08K 3/30: Sulfur-, selenium- or tellurium-containing compounds
- C08K 3/36: Silica
- C08K 5/01: Hydrocarbons {(C08K5/0091 takes precedence)}
- C08K 5/098: Metal salts of carboxylic acids
- C08K 9/02: Ingredients treated with inorganic substances
- C08K 11/005: {Waste materials, e.g. treated or untreated sewage sludge}
- C09D 109/00: Coating compositions based on homopolymers or copolymers of conjugated diene hydrocarbons
- B60C 2001/0066: {Compositions of the belt layers}
- B60C 2009/0021: {Coating rubbers for steel cords}
- B60C 2009/0071: {characterised by special physical properties of the reinforcements}
- B60C 2009/0276: {Modulus; Hardness; Loss modulus or "tangens delta"}
- B60C 2009/2064: {Modulus; Hardness; Loss modulus or "tangens delta"}
- C08K 2003/2296: {of zinc}
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

The invention relates to a wire coat rubber composition for coating metal wires in a tire, the rubber composition comprising from 60 to 100 phr of natural rubber, from 0 to 40 phr of synthetic polyisoprene, from 40 to 70 phr of oxidized carbon black, up to 5 phr of a resin and up to 8 phr of oil. The present invention also relates to a tire comprising such a wire coat composition.

## Claims

### Claim 1

A wire coat rubber composition comprising from 60 phr to 100 phr of natural rubber, up to 40 phr of synthetic polyisoprene, and from 40 phr to 100 phr of a filler, wherein the filler includes at least 40 phr of a surface oxidized carbon black, wherein the wire coat rubber composition contains no more than 5 phr of resins, and wherein the wire coat rubber composition contains no more than 8 phr of oils.

### Claim 2 (depends on 1)

The wire coat rubber composition of claim 1 wherein the filler is present at a level which is within the range of 40 phr to 70 phr, wherein said filler comprises from 45 to 65 phr of the surface oxidized carbon black.

### Claim 3 (depends on 2)

The wire coat rubber composition of claim 2, wherein the surface oxidized carbon black is present at a level which is within the range of 50 phr to 60 phr.

### Claim 4 (depends on 1)

The wire coat rubber composition of claim 1, wherein the filler is further comprised of silica, wherein the ratio of the surface oxidized carbon black to the silica is at least 2:1.

### Claim 5 (depends on 4)

The wire coat rubber composition of claim 4, wherein the ratio of the surface oxidized carbon black to the silica is at least 3:1.

### Claim 6 (depends on 1)

The wire coat rubber composition of claim 1, wherein the surface oxidized carbon black is hydrogen peroxide treated carbon black.

### Claim 7 (depends on 1)

The wire coat rubber composition of claim 1, wherein the surface oxidized carbon black is ozone treated carbon black.

### Claim 8 (depends on 1)

The wire coat rubber composition of claim 1, wherein the pH of the surface oxidized carbon black is below 6.

### Claim 9 (depends on 1)

The wire coat rubber composition of claim 1, wherein the pH of the surface oxidized carbon black is below 4.

### Claim 10 (depends on 1)

The wire coat rubber composition of claim 1, wherein the pH of the surface oxidized carbon black is within the range of 1 to 3.

### Claim 11 (depends on 1)

The wire coat rubber composition of claim 1, wherein said surface oxidized carbon black includes on its surface at least one of carboxyl groups and at least one hydroxyl groups.

### Claim 12 (depends on 1)

The wire coat rubber composition of claim 1, wherein the surface oxidized carbon black is a surface oxidized N234 carbon black.

### Claim 13 (depends on 1)

The wire coat rubber composition of claim 1, further comprising from 0.1 phr to 5 phr of a cobalt salt.

### Claim 14 (depends on 13)

The wire coat rubber composition of claim 13 wherein the cobalt salt is present at a level which is within the range of 0.2 phr to 2 phr.

### Claim 15 (depends on 1)

The wire coat rubber composition of claim 1, further comprising from 1 phr to 20 phr of zinc oxide.

### Claim 16 (depends on 1)

The wire coat rubber composition of claim 1 wherein the zinc oxide is present at a level which is within the range of 5 phr to 15 phr.

### Claim 17 (depends on 1)

The wire coat rubber composition of claim 1 which is further comprised of 4 phr to 10 phr of sulfur.

### Claim 18 (depends on 1)

The wire coat rubber composition of claim 1, wherein the rubber composition is essentially resin free.

### Claim 19 (depends on 1)

The wire coat rubber composition of claim 1, wherein the composition contains less than 2 phr of the resin and less than 5 phr of oil.

### Claim 20 (depends on 1)

A pneumatic tire which is comprised of a generally toroidal-shaped carcass with an outer circumferential tread, two spaced beads, at least one textile reinforced ply extending from bead to bead, and sidewalls extending radially from and connecting said tread to said beads, wherein said tread is adapted to be ground-contacting, and wherein the tire further includes metal reinforcing wires which are embedded in the wire coat rubber composition of claim 1.