Sulfur-crosslinkable rubber mixture, vulcanizate of the rubber mixture, and vehicle tire

Patent metadata

Field	Value
Publication number	US-10927241-B2
Application number	US-201816763759-A
Country	US
Kind code	B2
Filing date	Sep 4, 2018
Priority date	Nov 28, 2017
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

The invention relates to a sulfur-crosslinkable rubber mixture, to a vulcanizate thereof and to a vehicle tire. The sulfur-crosslinkable rubber mixture contains at least the following constituents:
at least one diene rubber; and 10 to 300 phr of at least one silica; and 1 to 30 phf of at least one silane A having general empirical formula A-I)

(R 1 ) o Si—R 2 —(S—R 3 ) q —S—X; and  A-I)
0.5 to 30 phf of at least one silane B having general empirical formula B-I)

(R 1 ) o Si—R 2 —(S—R 3 ) u —S—R 2 —Si(R 1 ) o   B-I)
wherein q is 1, 2 or 3; and u is 1, 2 or 3; and X is a hydrogen atom or a —C(═O)—R 8 group wherein R 8 is selected from hydrogen C 1 -C 20 -alkyl groups, preferably C 1 -C 17 , C 6 -C 20 -aryl groups, preferably phenyl, C 2 -C 20 -alkenyl groups and C 7 -C 20 -aralkyl groups.

First claim

The invention claimed is:

1. A sulfur-crosslinkable rubber mixture comprising at least the following constituents:
at least one diene rubber;
10 to 300 phr of at least one silica;
1 to 30 phf of at least one silane A having general empirical formula A-I):
(R 1 ) o Si—R 2 —(S—R 3 ) q —S—X; and,  A-I)

0.5 to 30 phf of at least one silane B having general empirical formula B-I):
(R 1 ) o Si—R 2 -(s-R 3 ) u —S—R 2 —Si(R 1 ) o ;  B-I)

wherein o may be 1, 2 or 3 and the radicals R 1 may be identical or different and are selected from C 1 -C 10 -alkoxy groups, C 6 -C 20 -phenoxy groups, C 2 -C 10 -cyclic dialkoxy groups, C 2 -C 10 -dialkoxy groups, C 4 -C 10 -cycloalkoxy groups, C 6 -C 20 -aryl groups, C 1 -C 10 -alkyl groups, C 2 -C 20 -alkenyl groups, C 2 -C 20 -alkynyl groups, C 7 -C 20 -aralkyl groups, halides or alkyl polyether group —O—(R 6 —O) r —R 7 , wherein the radicals R 6 are identical or different and are branched or unbranched, saturated or unsaturated, aliphatic, aromatic or mixed aliphatic/aromatic divalent C 1 -C 30 -hydrocarbon group, r is an integer from 1 to 30, and the radicals R 7 are unsubstituted or substituted, branched or unbranched monovalent alkyl, alkenyl, aryl or aralkyl groups, or two R 1 correspond to a dialkoxy group having 2 to 10 carbon atoms wherein in that case o<3, or two or more silanes of formulae A-I) and/or B-I) may be bridged via radicals R 1 or by condensation; with the proviso that in the formulae A-I) and B-I) in each (R 1 ) o Si group at least one R 1 is selected from the abovementioned options where this R 1 i) is bonded to the silicon atom via an oxygen atom or ii) is a halide;
wherein the radicals R 2 and R 3 in each molecule and within a molecule may be identical or different and are branched or unbranched, saturated or unsaturated, aliphatic, aromatic or mixed aliphatic/aromatic divalent C 1 -C 30 -hydrocarbon groups; and,
wherein q is 1 or 2 or 3; and u is 1 or 2 or 3; and X is a hydrogen atom or a —C(═O)—R 8 group wherein R 8 is selected from hydrogen, C 1 -C 2 -alkyl groups, C 6 -C 20 -aryl groups, C 2 -C 20 -alkenyl groups and C 7 -C 20 -aralkyl groups.

2. The sulfur-crosslinkable rubber mixture according to claim 1 , wherein q is 1.

3. The sulfur-crosslinkable rubber mixture according to claim 1 , wherein u is 1.

4. The sulfur-crosslinkable rubber mixture according to claim 1 , wherein R 2 is an alkyl group having 2 or 3 carbon atoms.

5. The sulfur-crosslinkable rubber mixture according to claim 1 , wherein R 3 is an alkyl group having 4 to 8 carbon atoms.

6. The sulfur-crosslinkable rubber mixture according to claim 1 , wherein X is an alkanoyl group.

7. The sulfur-crosslinkable rubber mixture according to claim 1 , wherein the silane A has the following structure conforming to formula A-II):
(EtO) 3 Si—(CH 2 ) 3 —S—(CH 2 ) 6 —S—C(═O)—CH 3 .  A-II)

8. The sulfur-crosslinkable rubber mixture according to claim 1 , wherein the silane A has the following structure conforming to formula A-III):
(EtO) 3 Si—(CH 2 ) 3 —S—(CH 2 ) 6 —S—C(═O)—(CH 2 ) 6 —CH 3 .  A-III)

9. The sulfur-crosslinkable rubber mixture according to claim 1 , wherein the silane A has the following structure conforming to formula A-IV):
(EtO) 3 Si—(CH 2 ) 3 —S—(CH 2 ) 6 —S—C(═O)—(CH 2 ) 16 —CH 3 .  A-IV)

10. The sulfur-crosslinkable rubber mixture according to claim 1 , wherein the silane B has the following structure conforming to formula B-II):

11. The sulfur-crosslinkable rubber mixture according to claim 1 , wherein the molar ratio of silanes A present to silanes B present is 20:80 to 90:10.

12. The sulfur-crosslinkable rubber mixture according to claim 1 , wherein the diene rubber is selected from the group consisting of natural polyisoprene (NR), synthetic polyisoprene (IR), butadiene rubber (BR), solution-polymerized stirene-butadiene rubber (SSBR) and emulsion-polymerized stirene-butadiene rubber (ESBR).

13. A vulcanizate obtained by sulfur vulcanization of at least one rubber mixture according to claim 1 .

14. A vehicle tire comprising at least one component part based upon at least one vulcanizate according to claim 13 .

15. The vehicle tire according to claim 14 comprising the at least one vulcanizate in a tread of the vehicle tire.

Assignees

• Continental Reifen Deutschland Gmbh

Inventors

• Schoeffel Julia
• Mueller Norbert
• Recker Carla
• Weber Christine
• Tarantola Gesa
• Dauer David-Raphael
• Schax Fabian
• Hojdis Nils

Classifications

• C08L2312/08

  by silane · CPC title

• B60C1/0016

  Compositions of the tread · CPC title

• C08K5/548

  containing sulfur {(C08K5/5477 takes precedence)} · CPC title

• C08L9/06 Primary

  Copolymers with styrene · CPC title

• B29B7/7495

  for mixing rubber · CPC title