Coating for elastomeric linear profiles, in particular windscreen-wiper blades, and process for production thereof

• US 8,575,078 B2
• Filed: 02/04/2009
• Issued: 11/05/2013
• Est. Priority Date: 04/02/2008
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Duval, Vincent, Verburgh, Yves, Carlier, Valerie
• Primary Examiner(s): Toomer, Cephia D
• Assistant Examiner(s): VASISTH, VISHAL V
• Application Number:
  US12/919,581
• Publication Number:
  US 20100325830A1
• Time in Patent Office: 1,735 Days
• Field of Search: 508/109, 508/113, 508/155, 508/181, 508/167, 508/591, 508/258, 152/504.8, 427/372.2
• US Class Current: 508/113
• CPC Class Codes: B60S 1/38 Wiper blades provided with liquid spreading means B60S1/524; provided with gas spreading means B60S1/546
• CPC Class Codes: B60S 2001/3829 characterised by the material of the squeegee or coating thereof
• CPC Class Codes: B60S 2001/3898 method for manufacturing wiper blades
• CPC Class Codes: C08J 2321/00 Characterised by the use of unspecified rubbers
• CPC Class Codes: C08J 7/0427 with only one layer of a composition containing a polymer binder with more layers C08J7/042
• CPC Class Codes: C08J 7/046 Forming abrasion-resistant coatings; Forming surface-hardening coatings
• CPC Class Codes: C08K 3/04 Carbon
• CPC Class Codes: C08K 3/30 Sulfur-, selenium- or tellurium-containing compounds
• CPC Class Codes: C08K 3/38 Boron-containing compounds
• CPC Class Codes: C08K 3/40 Glass
• CPC Class Codes: C08L 23/06 Polyethene
• CPC Class Codes: C08L 23/12 Polypropene
• CPC Class Codes: C08L 27/18 Homopolymers or copolymers or tetrafluoroethene
• CPC Class Codes: C08L 33/02 Homopolymers or copolymers of acids; Metal or ammonium salts thereof
• CPC Class Codes: C08L 61/28 with melamine
• CPC Class Codes: C09D 7/61 inorganic
• CPC Class Codes: C09D 7/65 macromolecular C09D7/41-C09D7/48 take precedence

Abstract

The present invention relates to a coating for elastomeric linear profiles, where the coating comprises solid lubricant embedded into a polymeric matrix. It also relates to a wiper blade for windscreen wipers, comprising this type of coating, and also to a process for the production of an elastomeric linear profile coated according to the invention. The polymeric matrix with embedded solid lubricant is obtained by polymerizing, in the absence of polymeric binders, a mixture comprising the solid lubricant and low-molecular-weight crosslinking agent. In one embodiment, the matrix is obtained from the thermal polymerization of the low-molecular-weight crosslinking agent hexamethoxymethylmelamine. Examples of solid lubricants are graphite and HDPE.

Claims

1. A wiper blade for windshield wipers, comprising an elastomeric linear profile having a coating, where the coating comprises solid lubricant embedded into a polymeric matrix, characterized in that the polymeric matrix is obtained with embedded solid lubricant by polymerizing, in the absence of polymeric binders, a mixture comprising the solid lubricant and low-molecular-weight crosslinking agent, where the low-molecular-weight crosslinking agent has been selected from the group consisting of fully alkoxylated melamine derivatives, partially alkoxylated melamine derivatives, and/or hexamethoxymethylmelamine.

2. The wiper blade as claimed in claim 1, where the material of the solid lubricant has been selected from the group consisting of graphite, molybdenum disulfide, hexagonal boron nitride, glass microbeads, polytetrafluoroethylene, polyethylene, and/or polypropylene.

3. The wiper blade as claimed in claim 1, where, within the polymeric matrix, the phase-volume ratio of solid lubricant to polymerized crosslinking agent is in a range from ≧

0.3 to ≦

9.0.

4. The wiper blade for windshield wipers as claimed in claim 1, where a further layer has been arranged on the polymerized coating and/or on an uncoated surface and comprises solid lubricant, and where, in said layer, the solid lubricant has not been embedded into a crosslinked polymeric matrix.

5. The wiper blade as claimed in claim 2, where the low-molecular-weight crosslinking agent has been selected from the group consisting of fully alkoxylated melamine derivatives, partially alkoxylated melamine derivatives, and/or hexamethoxymethylmelamine.