Wiper rubber for windshield wipers

• US 8,759,449 B2
• Filed: 11/11/2008
• Issued: 06/24/2014
• Est. Priority Date: 11/28/2007
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Pieters, Eric, Lay, Reiner, Kleinknecht, Harald, Parton, Hilde
• Primary Examiner(s): Rabago, Roberto
• Application Number:
  US12/745,097
• Publication Number:
  US 20100263156A1
• Time in Patent Office: 2,051 Days
• Field of Search: 525/194, 525/196, 525/215, 525/331.1, 525/332.7, 525/333.1, 525/349, 525/375, 524/526, 524/527, 524/572, 152/500.01, 152/504.8
• US Class Current: 525/194
• CPC Class Codes: B60S 2001/3829 characterised by the material of the squeegee or coating thereof
• CPC Class Codes: C08K 5/0025 Crosslinking or vulcanising agents; including accelerators
• CPC Class Codes: C08K 5/3492 Triazines
• CPC Class Codes: C08K 5/47 Thiazoles
• CPC Class Codes: C08L 21/00 Compositions of unspecified rubbers

Abstract

The invention relates to a wiper rubber for windshield wipers, which contains at least one rubber component that is cured by vulcanization, the material of the wiper rubber containing, at least in the unvulcanized state, a combination of a cross-linking agent with sulfur and/or with a sulfur donor.

Claims

1. A rubber windshield wiper blade comprising at least one vulcanization-hardened rubber component, characterized in that, at least in the unvulcanized state, the wiper blade material comprises a crosslinking agent, sulfur and a sulfur donor, wherein the rubber component comprises a mixture of natural rubber with chloroprene rubber, and wherein the crosslinking agent comprises a triazine and the sulfur donor is a caprolactam disulfide.

2. The windshield wiper blade as claimed in claim 1, characterized in that, at least in the unvulcanized state of the wiper blade material, the content of crosslinking agent, sulfur, and sulfur donor, based on the total content of rubber components in the wiper blade material, is from 0.3 to 30% by weight.

3. The windshield wiper blade as claimed in claim 1, characterized in that, at least in the unvulcanized state of the wiper blade material, the amount of the sulfur donor present, based on the total content of rubber components in the wiper blade material, is from 0.01 to 8% by weight.

4. The windshield wiper blade as claimed in claim 1, characterized in that, at least in the unvulcanized state, the wiper blade material also comprises a vulcanization accelerator.

5. The windshield wiper blade as claimed in claim 4, characterized in that the vulcanization accelerator is a sulfenamide, a guanidine, a thiuram, an alkylthiazolidinethione and/or a thiazole.

6. The windshield wiper blade as claimed in claim 5, characterized in that the sulfenamide is a thiazolesulfenamide.

7. The windshield wiper blade as claimed in claim 4, characterized in that, at least in the unvulcanized state of the wiper blade material, the amount of the vulcanization accelerator present, based on the total content of rubber components in the wiper blade material, is from 0.1 to 8% by weight.

8. The windshield wiper blade as claimed in claim 1, characterized in that a secondary vulcanization accelerator has been provided in the form of a transition metal alkyl dithiophosphate.

9. The windshield wiper blade as claimed in claim 1, characterized in that the amount of chloroprene rubber present, based on the total content of rubber components, is at least 20% by weight.

10. The windshield wiper blade as claimed in claim 1, characterized in that the amount of natural rubber present, based on the total content of rubber components, is at least 30% by weight.

11. The windshield wiper blade as claimed in claim 1, characterized in that the wiper blade material also comprises a metal oxide.

12. A rubber windshield wiper blade comprising at least one vulcanization-hardened rubber component, characterized in that, at least in the unvulcanized state, the wiper blade material comprises a crosslinking agent, a vulcanization accelerator, at least one of sulfur and a sulfur donor, no ethylenethiourea, and no tetramethylthiuram disulfide, wherein the crosslinking agent comprises a triazine and the vulcanization accelerator is an alkylthiazolidinethione, and wherein the rubber component comprises a mixture of natural rubber with chloroprene rubber.

13. The windshield wiper blade as claimed in claim 12, characterized in that, at least in the unvulcanized state of the wiper blade material, the content of crosslinking agent, sulfur, and sulfur donor, based on the total content of rubber components in the wiper blade material, is from 0.3 to 30% by weight.

14. The windshield wiper blade as claimed in claim 12, characterized in that the sulfur donor is a dithiophosphate, a thiuram, and/or a caprolactam disulfide.

15. The windshield wiper blade as claimed in claim 12, characterized in that, at least in the unvulcanized state of the wiper blade material, the amount of the sulfur donor present, based on the total content of rubber components in the wiper blade material, is from 0.01 to 8% by weight.

16. The windshield wiper blade as claimed in claim 12, characterized in that, at least in the unvulcanized state of the wiper blade material, the amount of the vulcanization accelerator present, based on the total content of rubber components in the wiper blade material, is from 0.1 to 8% by weight.

17. The windshield wiper blade as claimed in claim 12, characterized in that a secondary vulcanization accelerator has been provided in the form of a transition metal alkyl dithiophosphate.

18. The windshield wiper blade as claimed in claim 12, characterized in that the amount of chloroprene rubber present, based on the total content of rubber components, is at least 20% by weight.

19. The windshield wiper blade as claimed in claim 12, characterized in that the amount of natural rubber present, based on the total content of rubber components, is at least 30% by weight.

20. The windshield wiper blade as claimed in claim 12, characterized in that the wiper blade material also comprises a metal oxide.