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US 7,144,622 B1Granted
Coating and a seal consisting of said coating
AssigneeSTE Gesellschaft fur Dichtungstechnik mbH
InventorsFriedhelm Stecher, Christoph Stecher
Life of this patent
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Abstract
The invention pertains to a coating for application to a substrate, whereby the coating comprises at least one the thermoplastic fluorine-containing polymer, and its hardness decreases from the first surface, which is destined for application to the substrate, in the direction of the second surface which is remote from the substrate. The hardness gradient can be achieved by adding filling or reinforcing agents or by addition of at least one thermoplastic polymer. The invention additionally pertains to a gasket that consists of the coating in accordance with the invention or that comprises it.
Claims23
Coating composition, wherein the coating comprises:
- thermoplastic fluorine-containing polymer;
- and
- a thermoplastic polycondensate,
- wherein the coating has a hardness gradient, wherein the coating hardness generally decreases from a first surface to a second surface, said coating being free from polyamides, polyimides or polyesters,
- wherein the coating comprises at least one thermoplastic polycondensate with a higher hardness than the thermoplastic fluorine-containing polymer, of which there is at least one,
- wherein the concentration of the thermoplastic polycondensate increases in the direction of the first surface,
- wherein, proximal to the first surface, the proportion of fluorine-containing polymer is 0 wt %,
- wherein the thermoplastic polycondensate is a material selected from the group consisting of polysulfone (PSU), polyphenylethersulfone (PPSU), polyaryletherketone (PAEK), polyetherketone (PEK), polyetheretherketone (PEEK), and mixtures thereof, and
- wherein the coating is essentially free of polymers other than the selected material from said group of thermoplastic polycondensate and the thermoplastic fluorine-containing polymer.
6 more elements
Coating composition for application to a substrate, wherein the coating comprises:
- at least one thermoplastic fluorine-containing polymer;
- and
- a filling or reinforcing agent,
- wherein the coating has a hardness gradient, wherein the coating hardness generally decreases from a first surface to a second surface, said coating being free from polyamides, polyimides or polyesters,
- wherein at least one filling or reinforcing agent is added to the thermoplastic fluorine-containing polymer, of which there is at least one, wherein the concentration of the filling or reinforcing agent increases in the direction of the first surface,
- wherein the agent, of which there is at least one, is a material selected from the group consisting of graphite, carbon, carbon fibers, glass fibers, whiskers, molybdenum disulfide, and combinations thereof, and
- wherein the particles comprising the filling or reinforcing agent are aligned essentially parallel to the first and second surface.
4 more elements
Coating composition, wherein the coating comprises:
- at least one thermoplastic fluorine-containing polymer;
- and
- at least one thermoplastic polycondensate,
- wherein the thermoplastic polycondensate has a higher hardness than the thermoplastic fluorine-containing polymer, of which there is at least one,
- wherein the concentration of the thermoplastic polycondensate increases in the direction of the first surface,
- wherein the coating has a hardness gradient, wherein the coating hardness generally decreases from a first surface to a second surface, and
- wherein the thermoplastic polycondensate is a material selected from the group consisting of polyaryletherketone (PAEK), polyetherketone (PEK), polyetheretherketone (PEEK), and mixtures thereof.
4 more elements
Coating composition, wherein the coating comprises:
- at least one thermoplastic fluorine-containing polymer;
- and
- at least one thermoplastic polycondensate;
- wherein the thermoplastic polycondensate has a higher hardness than the thermoplastic fluorine-containing polymer, of which there is at least one,
- wherein the concentration of the thermoplastic polycondensate increases in the direction of the first surface,
- wherein the coating has a hardness gradient, wherein the coating hardness generally decreases from a first surface to a second surface,
- wherein the thermoplastic polycondensate is a material selected from the group consisting of polyaryletherketone (PAEK), polyetherketone (PEK), polyetheretherketone (PEEK), and mixtures thereof,
- wherein, in the region of the first surface, the proportion of fluorine-containing polymer is 0 wt %, and
- wherein, in the region of the second surface, the proportion of fluorine-containing polymer is 80–100 wt %.
6 more elements
Process for the manufacture of a coating composition, wherein the coating comprises:
- at least one thermoplastic fluorine-containing polymer;
- and
- at least one thermoplastic polycondensate,
- wherein the thermoplastic polycondensate has a higher hardness than the thermoplastic fluorine-containing polymer, of which there is at least one,
- wherein the concentration of the thermoplastic polycondensate increases in the direction of the first surface,
- wherein the coating has a hardness gradient, wherein the coating hardness decreases from a first surface to a second surface,
- wherein the thermoplastic polycondensate is a material selected from the group consisting of polyaryletherketone (PAEK), polyetherketone (PEK), polyetheretherketone (PEEK), and mixtures thereof,
- wherein, in the region of the first surface, the proportion of fluorine-containing polymer is 0 wt %,
- wherein, in the region of the second surface, the proportion of fluorine-containing polymer is 80–100 wt %,
- wherein a first layer, comprises thermoplastic polycondensates but no fluorine-containing polymers, and
- wherein successive layers comprising a coating of decreasing hardness are sequential, and are sintered or partially melted by heating.
8 more elements
Dependencies are inferred from the claim text.