Silicone-polymer-modified vulcanized-rubber compositions, processes for their production, and also windshield wipers encompassing said material

• US 8,148,467 B2
• Filed: 04/01/2009
• Issued: 04/03/2012
• Est. Priority Date: 04/04/2008
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Pieters, Eric, Verburgh, Yves
• Primary Examiner(s): LOEWE, ROBERT S
• Application Number:
  US12/416,669
• Publication Number:
  US 20090253866A1
• Time in Patent Office: 1,098 Days
• Field of Search: None
• US Class Current: 525/101
• 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: C08G 77/20 containing silicon bound to unsaturated aliphatic groups C08G77/045 takes precedence
• CPC Class Codes: C08G 77/392 containing sulfur
• CPC Class Codes: C08L 83/04 Polysiloxanes

Abstract

A silicone-polymer-modified vulcanized-rubber composition based on unvulcanized rubber, characterized in that the composition can be produced by co-vulcanization from the following components:

• A1) at least one vinyl-reactive polysiloxane component, and/or
• A2) at least one mercapto-reactive polysiloxane component, and
• B) at least one unsaturated vulcanizable unvulcanized-rubber component, and to a process for the production of said silicone-polymer-modified vulcanized-rubber composition based on unvulcanized rubber, and also to a windshield-wiper blade encompassing a silicone-polymer-modified vulcanized-rubber composition based on unvulcanized rubber.

Claims

1. A silicone-polymer-modified vulcanized-rubber composition based on unvulcanized rubber, characterized in that the composition is produced by co-vulcanization from the following components:

A1) at least one vinyl-reactive polysiloxane component;

A2) at least one mercapto-reactive polysiloxane component, and

B) at least one unsaturated vulcanizable unvulcanized-rubber component,

wherein the weight-average molecular weight of the mercapto-reactive polysiloxane component A2) is from 3000 to 28 000 and wherein the vinyl-reactive polysiloxane component A1) has been selected from the group consisting of vinyldimethyl-terminated polydimethylsiloxanes, vinylmethylsiloxane-polydimethyl-siloxane copolymers, alkyldimethyl-terminated polydimethylsiloxanes, vinyl-terminated dimethyldiphenyl-siloxane copolymers, and branched polydimethylsiloxanes having a vinyl group at the branching point.

2. A silicone-polymer-modified vulcanized-rubber composition according to claim 1, characterized in that component B) has been selected from the group of natural unvulcanized rubber, polychloropropene, EPDM, EPM, and mixtures thereof.

3. A silicone-polymer-modified vulcanized-rubber composition according to claim 1, characterized in that the mercapto-reactive polysiloxane component A2) has been selected from the group consisting of polydimethylsiloxane-methylmercaptopropylsiloxane copolymers, branched polydimethylsiloxanes having a mercapto group at the branching points, and mercaptoalkyl-terminated polydimethylsiloxanes.

4. A silicone-polymer-modified vulcanized-rubber composition according to claim 1, characterized in that the weight-average molecular weight of the mercapto-reactive polysiloxane component A2) is from 5000 to 10 000.

5. A silicone-polymer-modified vulcanized-rubber composition according to claim 1, characterized in that the mercapto-reactive component A2) is used in a ratio by weight with respect to component B) which is from 1:

100 to 20;

100.

6. A silicone-polymer-modified vulcanized-rubber composition according to claim 1, characterized in that the weight-average molecular weight of the polysiloxane component A1) is from 200 to 310 000.

7. A silicone-polymer-modified vulcanized-rubber composition according to claim 6, characterized in that the mercapto-reactive polysiloxane component A2) has been selected from the group consisting of polydimethylsiloxane-methylmercaptopropylsiloxane copolymers, branched polydimethylsiloxanes having a mercapto group at the branching points, and mercaptoalkyl-terminated polydimethylsiloxanes.

8. A silicone-polymer-modified vulcanized-rubber composition according to claim 7, characterized in that the weight-average molecular weight of the mercapto-reactive polysiloxane component A2) is from 5000 to 10 000.

9. A silicone-polymer-modified vulcanized-rubber composition according to claim 7, characterized in that the vinyl-reactive component A1) and/or the mercapto-reactive component A2) is used in a ratio by weight with respect to component B) which is from 1:

100 to 20;

100.

10. The silicone-polymer-modified vulcanized-rubber composition according to claim 7, wherein the vinyl-reactive component A1) and/or the mercapto-reactive component A2) is used in a ratio by weight with respect to component B) which is from 3:

100 to 7;

100.

11. The silicone-polymer-modified vulcanized-rubber composition according to claim 1, wherein the vinyl-reactive component A1) is used in a ratio by weight with respect to component B) which is from 1:

100 to 20;

100.

12. The silicone-polymer-modified vulcanized-rubber composition according to claim 1, wherein the vinyl-reactive component A1) is used in a ratio by weight with respect to component B) which is from 3:

100 to 7;

100.

13. The silicone-polymer-modified vulcanized-rubber composition according to claim 1, wherein the mercapto-reactive component A2) is used in a ratio by weight with respect to component B) which is from 3:

100 to 7;

100.

14. The silicone-polymer-modified vulcanized-rubber composition according to claim 1, wherein the weight-average molecular weight of the polysiloxane component A1) is from 28 000 to 120 000.