US 5,989,712 AGranted

Process for treating a body of stainless steel so as to promote its adherence to a rubber composition

AssigneeMichelin Recherche et Technique S.A.

InventorsBruno Grimberg, David Lenabour, Patrice Person, Corinne Tonon

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Abstract

Process for treating a body of steel to promote its adherence to a composition which includes at least a rubber, containing the following points: a body at least the surface of which is of stainless steel is used, this steel containing at least 0.02% and at most 0.2% carbon, at least 3% and at most 20% nickel, at least 12% and at most 28% chromium, the sum of the nickel and the chromium being at least equal to 20% and at most equal to 35%, all of these percentage values being by weight; the structure of the steel includes at least 20% by volume of martensite and is without austenite or it comprises less than 80% thereof by volume; the surface of the body is activated and then treated with at least one starting silane so that it is covered with a film constituted only, or substantially only, of one or more silanes, in such a manner that this surface treated in this way can be placed directly in contact with the composition. Articles comprising a rubber composition and a metal body which has been treated in accordance with the process of the invention, such articles being for instance tires.

Claims24

Dependent claims

A process for making a body, at least the surface of which comprises stainless steel, that adheres to a composition comprising at least one rubber, said process comprising:

activating the stainless steel surface of the body, said steel containing at least 0.02% and at most 0.2% carbon, at least 3% and at most 20% nickel, at least 12% and at most 28% chromium, the sum of the nickel and chromium being at least equal to 20% and at most equal to 35%, all of these percentages being by weight;
the structure of the steel comprises at least 20% by volume of martensite and it is without austenite or contains less than 80% thereof by volume;
treating the surface of the body with at least one starting silane such that the surface is covered with a film constituted exclusively, or substantially exclusively, of one or more silanes characterized by the following formula:
##STR2## in which R represents an organic radical containing at least one function capable of reacting with at least one element of the composition;
each OR' represents a group capable of reacting with an oxide or hydroxide of the surface of the stainless steel;
each R" represents, independently, hydrogen, a cyclic or acyclic organic radical, or a halogen;
and a, which may be zero, is equal to at most 2;
placing the treated surface of the body in direct contact with the composition;
and
curing the composition.

7 more elements

A rubber/steel body composite comprising a rubber composition and a steel body, at least the surface of which comprises stainless steel, that adheres to a composition comprising at least one rubber, said composite being obtainable by a process comprising:

activating the stainless steel surface of the body, said steel containing at least 0.02% and at most 0.2% carbon, at least 3% and at most 20% nickel, at least 12% and at most 28% chromium, the sum of the nickel and chromium being at least equal to 20% and at most equal to 35%, all of these percentages being by weight;
the structure of the steel comprises at least 20% by volume of martensite and it is without austenite or contains less than 80% thereof by volume;
treating the surface of the body with at least one starting silane such that the surface is covered with a film constituted exclusively, or substantially exclusively, of one or more silanes characterized by the following formula:
##STR3## in which R represents an organic radical containing at least one function capable of reacting with at least one element of the composition;
each OR' represents a group capable of reacting with an oxide or hydroxide of the surface of the stainless steel;
each R" represents, independently, hydrogen, a cyclic or acyclic organic radical, or a halogen;
and a, which may be zero, is equal to at most 2;
placing the treated surface of the body in direct contact with the composition;
and
curing the composition.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/085,096Filed 26 May 1998 · division
Priority: FR 95/0379529 Mar 1995
Granted: 23 Nov 1999
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

C08J 5/06
Reinforcing macromolecular compounds with loose or coherent fibrous material: using pretreated fibrous materials
D07B 1/066
Reinforcing cords for rubber or plastic articles: the wires being made from special alloy or special steel composition
D07B 1/0666
Reinforcing cords for rubber or plastic articles: the wires being characterised by an anti-corrosive or adhesion promoting coating
C08J 2321/00
Working-up: characterised by the use of unspecified rubbers