Rubber composite reinforced by at least one steel reinforcing element rendered adhesive by an adhesive composition containing aromatic aldehyde and polyphenol

Patent metadata

Field	Value
Publication number	US-2017166010-A1
Application number	US-201515117036-A
Country	US
Kind code	A1
Filing date	Feb 5, 2015
Priority date	Feb 6, 2014
Publication date	Jun 15, 2017
Grant date	—

Abstract

The rubber composite comprises a steel reinforcing element coated with an adhesive layer coating at least a portion of the reinforcing element. The adhesive layer comprises an adhesive composition comprising at least one phenol/aldehyde resin based on at least: one aromatic aldehyde and one polyphenol comprising one or more aromatic nucleus/nuclei. The coated steel reinforcing element is embedded in a rubber matrix based on a rubber composition comprising a crosslinking system comprising a content of molecular sulphur ranging from 1 to 5 phr.

First claim

1 .- 21 . (canceled)

22 . A rubber composite reinforced with at least one steel reinforcing element coated at least in part with an adhesive layer, the reinforced rubber composite comprising a rubber matrix in which the coated steel reinforcing element is embedded, wherein the adhesive layer comprises an adhesive composition comprising at least one phenol/aldehyde resin based on at least:
one aromatic aldehyde bearing at least one aldehyde functional group and comprising at least one aromatic nucleus; and one polyphenol comprising one or more aromatic nucleus/nuclei,
wherein, if there is only one aromatic nucleus, the one aromatic nucleus bears two or three hydroxyl functional groups in the meta position with respect to each other or with respect to one another, the remainder of the aromatic nucleus being unsubstituted, and
wherein, if there is more than one aromatic nuclei, at least two of them each bear two or three hydroxyl functional groups in the meta position with respect to each other or with respect to one another and the two positions ortho to at least one of these hydroxyl functional groups are unsubstituted, and
wherein the rubber matrix is based on a rubber composition comprising a crosslinking system comprising a content of molecular sulphur ranging from 1 to 5 phr.

23 . The rubber composite according to claim 22 , wherein the content of molecular sulphur of the crosslinking system of the rubber composition is less than or equal to 4 phr.

24 . The rubber composite according to claim 23 , wherein the content of molecular sulphur of the crosslinking system of the rubber composition is less than or equal to 3 phr.

25 . The rubber composite according to claim 24 , wherein the content of molecular sulphur of the crosslinking system of the rubber composition is less than or equal to 2.5 phr.

26 . The rubber composite according to claim 22 , wherein the content of molecular sulphur of the crosslinking system of the rubber composition is greater than or equal to 1.5 phr.

27 . The rubber composite according to claim 26 , wherein the content of molecular sulphur of the crosslinking system of the rubber composition is greater than or equal to 2 phr.

28 . The rubber composite according to claim 22 , wherein the rubber composition comprises at least one diene elastomer.

29 . The rubber composite according to claim 28 , wherein the at least one diene elastomer is selected from the group consisting of polybutadienes, natural rubber, synthetic polyisoprenes, butadiene/styrene copolymers, isoprene/butadiene copolymers, isoprene/styrene copolymers, butadiene/styrene/isoprene copolymers and mixtures thereof.

30 . The rubber composite according to claim 22 , wherein the coated steel reinforcing element comprises one or more threadlike reinforcing elements, each comprising a steel core.

31 . The rubber composite according to claim 30 , wherein the adhesive layer directly coats at least a portion of the steel core of the or each threadlike reinforcing element.

32 . The rubber composite according to claim 30 , wherein the adhesive layer directly coats a layer of a metal coating directly coating at least a portion of the steel core of the or each threadlike reinforcing element.

33 . The rubber composite according to claim 32 , wherein the metal of the layer of the metal coating directly coating at least a portion of the steel core of the or each threadlike reinforcing element is selected from the group consisting of zinc, copper, tin and alloys thereof.

34 . The rubber composite according to claim 30 , wherein the adhesive layer directly coats a nonmetallic intermediate adhesive layer coating the steel core of the or each threadlike reinforcing element.

35 . The rubber composite according to claim 22 , wherein the aromatic aldehyde bears at least two aldehyde functional groups.

36 . The rubber composite according to claim 22 , wherein the at least one aromatic nucleus of the aromatic aldehyde bears two aldehyde functional groups.

37 . The rubber composite according to claim 35 , wherein the aromatic aldehyde is selected from the group consisting of 1,2-benzenedicarboxaldehyde, 1,3-benzenedicarboxaldehyde, 1,4-benzenedicarboxaldehyde, 2-hydroxybenzene-1,3,5-tricarbaldehyde and mixtures thereof.

38 . The rubber composite according to claim 22 , wherein the aromatic aldehyde is of general formula (A):

in which X comprises N, S or O, and R represents —H or —CHO.

39 . The rubber composite according to claim 38 , wherein the aromatic aldehyde is selected from the group consisting of furfuraldehyde, 2,5-furandicarboxaldehyde and mixtures thereof.

40 . The rubber composite according to claim 22 , wherein the polyphenol is selected from the group consisting of phloroglucinol, 2,2′,4,4′-tetrahydroxydiphenyl sulphide and mixtures thereof.

41 . The rubber composite according to claim 22 , wherein the adhesive composition comprises an unsaturated elastomer latex.

42 . The rubber composite according to claim 41 , wherein the unsaturated elastomer of the latex is a diene elastomer.

43 . The rubber composite according to claim 42 , wherein the diene elastomer is selected from the group consisting of polybutadienes, butadiene copolymers, polyisoprenes, isoprene copolymers, vinylpyridine/styrene/butadiene terpolymers and mixtures thereof.

44 . A process for the manufacture of a rubber composite comprising the steps of:
coating at least a portion of a steel reinforcing element with an adhesive layer; and embedding the steel reinforcing element in a rubber matrix based on a rubber composition, wherein the adhesive layer comprises an adhesive composition comprising at least one phenol/aldehyde resin based on at least:
one aromatic aldehyde bearing at least one aldehyde functional group and comprising at least one aromatic nucleus; and
one polyphenol comprising one or more aromatic nucleus/nuclei,
wherein, if there is only one aromatic nucleus, the one aromatic nucleus bears two or three hydroxyl functional groups in the meta position with respect to each other or with respect to one another, the remainder of the aromatic nucleus being unsubstituted, and
wherein, if there is more than one aromatic nuclei, at least two of them each bear two or three hydroxyl functional groups in the meta position with respect to each other or with respect to one another and the two positions ortho to at least one of these hydroxyl functional groups is unsubstituted, and

wherein the rubber composition comprises a crosslinking system comprising a content of molecular sulphur ranging from 1 to 5 phr.

45 . A tire comprising at least one rubber composite according to claim 22 .

Assignees

• Michelin & Cie
• Michelin Rech Tech

Inventors

• Michoud Clément
• Doisneau David

Classifications

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title

• B32B2255/06

  on metal layer · CPC title

• B32B2405/00

  Adhesive articles, e.g. adhesive tapes · CPC title

• B60C2009/0014

  Surface treatments of steel cords · CPC title

• B60C2009/0021

  Coating rubbers for steel cords · CPC title