Organo-titanates as adhesion promoter for anti-noise shim on brake pads, associated brake pad and method
AssigneeITT Italia S.r.l.
InventorsValeria POLLIOTTO, Paolo GALIMBERTI
Life of this patent
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Abstract
For promoting adhesion of an anti-noise shim (6) to a surface (7) of a metallic support (2) of a braking element (1) normally painted with an epoxy resin and by means of gluing the anti-noise shim (6) to the surface by means of an acrylic glue, the surface (7) is pre-treated by applying a primer onto the epoxy resin paint layer (9), the primer consisting in an organo-titanate (10) diluted in an organic solvent, preferably an alcoholic polar solvent; the organo-titanate (10) is preferably a tetra-alkoxy titanium (IV) represented by the general formula Ti(OR)4.
Claims21
A method for anchoring a covering sheet element (6) to a surface (7) of a metallic support (2) for a braking element (1) by gluing the covering sheet element to said surface, comprising:
- pre-treating said surface (7) before the gluing by applying to said surface a primer compound, wherein the primer compound consists of an organo-titanate (10) diluted in an organic solvent.
A braking element (1), in particular a brake pad, comprising:
- a support (2) for a friction material block (5);
- and
- an anti-noise shim (6) applied to the support on the side opposite the friction material block, wherein
- the shim (6) is bonded to a first face (3) of the support opposite to said friction material block;
- said first face (3) of the support is painted with a first layer of an epoxy resin (9);
- a second layer of an organo-titanate (10) is spread onto said first layer of epoxy resin (9),
- the organo-titanate comprising alkoxy groups;
- the shim (6) is bonded to said first face (3) by means of a third layer of an acrylic resin (8) resting upon the second layer of organo-titanate (10);
- at least part of the respective alkoxy groups having been hydrolyzed by both the acrylic resin and the epoxy resin (9, 8) form a chemical bond (11) between the first and the third layer.
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A vehicle brake pad, comprising:
- a shim;
- a metallic backplate;
- an anti-noise sheet element;
- and
- a primer compound for promoting adhesion of the anti-noise sheet element to the metallic backplate, wherein
- a surface of the shim is painted with an epoxy resin,
- the anti-noise shim is glued to the surface of the shim by means of an acrylic glue or an adhesive based on an acrylic resin,
- the primer compound is spread onto the epoxy resin paint layer covering the surface of the shim so as to be interposed between the epoxy resin and the acrylic resin glue or adhesive;
- the primer compound consists of an organo-titanate diluted in an organic solvent,
- the organo-titanate is a tetra-alkoxy titanium represented by the general formula Ti(OR)4, wherein R is all the same or different and is preferably chosen from the group consisting in:
- unsubstituted alchilic groups, either with single or branched chains, substituted alchilic groups, either with single or branched chains, and substituents are chosen in the group consisting of:
- amino, phosphilic, ether, unsaturated hydrocarbon groups.
A method for producing a braking element including a support, a friction material block bonded to the support and an anti-noise element also bonded to the support on the side opposite to the friction material block, comprising:
- gluing the anti-noise element to a surface of the support;
- pre-treating the surface before the gluing by applying to the surface a primer compound, wherein the primer compound consists of an organo-titanate diluted in an organic solvent;
- and
- molding the friction material block onto the support.
Dependencies are inferred from the claim text.