Rubber composition and manufacturing method for rubber composition

Patent metadata

Field	Value
Publication number	US-2017321040-A1
Application number	US-201515534530-A
Country	US
Kind code	A1
Filing date	Dec 2, 2015
Priority date	Dec 10, 2014
Publication date	Nov 9, 2017
Grant date	—

Abstract

The present invention provides a rubber composition obtained by compounding a rubber component (A) containing a copolymer of a conjugated diene compound and an aromatic vinyl compound, a filler containing an inorganic filler (B), a silane coupling agent (C), and at least one accelerator (D) selected from the group consisting of zinc dithiophosphates represented by the general formula (1), being good in the processability in an unvulcanized state, and having a low-heat-generation property and a low abrasion property:

wherein, R 20 's are each independently hydrogen or a monovalent hydrocarbon group, and at least one of R 20 's is a substituted or unsubstituted linear alkyl group having from 7 to 18 carbon atoms, a substituted or unsubstituted branched-chain alkyl group having from 7 to 18 carbon atoms, or a substituted or unsubstituted cycloalkyl group having from 7 to 18 carbon atoms.

First claim

1 - 11 . (canceled)

12 . A rubber composition obtained by compounding a rubber component (A) containing a copolymer of a conjugated diene compound and an aromatic vinyl compound, a filler containing an inorganic filler (B), a silane coupling agent (C), and at least one accelerator (D) selected from the group consisting of zinc dithiophosphates represented by the general formula (1):

wherein, R 20 's are each independently hydrogen or a monovalent hydrocarbon group, and at least one of R 20 's is a substituted or unsubstituted linear alkyl group having from 7 to 18 carbon atoms, a substituted or unsubstituted branched-chain alkyl group having from 7 to 18 carbon atoms, or a substituted or unsubstituted cycloalkyl group having from 7 to 18 carbon atoms.

13 . The rubber composition according to claim 12 , wherein at least one of the R 20 's is a 2-ethylhexyl group.

14 . The rubber composition according to claim 12 , wherein at least two of the R 20 's are 2-ethylhexyl groups.

15 . The rubber composition according to claim 12 , wherein the silane coupling agent (C) is at least one compound selected from the group consisting of the compounds represented by the following general formulae (I) and (II):
(R 1 O) 3-p (R 2 ) p Si—R 3 —S a —R 3 —Si(OR 1 ) 3-r (R 2 ) r   (I)

wherein, R 1 's may be the same as or different from each other, and each represents a linear, cyclic or branched alkyl group having from 1 to 8 carbon atoms, or a linear or branched alkoxyalkyl group having from 2 to 8 carbon atoms; R 2 's may be the same as or different from each other, and each represents a linear, cyclic or branched alkyl group having from 1 to 8 carbon atoms; R 3 's may be the same as or different from each other, and each represents a linear or branched alkylene group having from 1 to 8 carbon atoms; a is from 2 to 6 in terms of average value; and p and r may be the same as or different from each other, and are each from 0 to 3 in terms of average value, provided that both p and r are not 3 simultaneously; and
(R 4 O) 3-s (R 5 ) s Si—R 6 —S k —R 7 —S k —R 6 —Si(OR 4 ) 3-t (R 5 ) t   (II)

wherein, R 4 's may be the same as or different from each other, and each represents a linear, cyclic or branched alkyl group having from 1 to 8 carbon atoms, or a linear or branched alkoxyalkyl group having from 2 to 8 carbon atoms; R 5 's may be the same as or different from each other, and each represents a linear, cyclic or branched alkyl group having from 1 to 8 carbon atoms; R 6 's may be the same as or different from each other, and each represents a linear or branched alkylene group having from 1 to 8 carbon atoms; R 7 represents any one of divalent groups represented by the general formulae (—S—R 8 —S—), (—R 9 —S m1 —R 10 —) and (—R 11 —S m2 —R 12 —S m3 —R 13 —) (wherein R 8 to R 13 may be the same as or different from each other, and each represents a divalent aliphatic hydrocarbon group having from 1 to 20 carbon atoms, a divalent alicyclic hydrocarbon group having from 1 to 20 carbon atoms, a divalent aromatic group or a divalent organic group containing a hetero element other than sulfur and oxygen; and m1, m2 and m3 may be the same as or different from each other, and are each 1 or more and less than 4 in terms of average value); k's may be the same as or different from each other, and are each from 1 to 6 in terms of average value; and s and t may be the same as or different from each other, and are each from 0 to 3 in terms of average value, provided that both s and t are not 3 simultaneously.

16 . The rubber composition according to claim 13 , wherein the silane coupling agent (C) is at least one compound selected from the group consisting of the compounds represented by the following general formulae (I) and (II):
(R 1 O) 3-p (R 2 ) p Si—R 3 —S a —R 3 —Si(OR 1 ) 3-r (R 2 ) r   (I)

wherein, R 1 's may be the same as or different from each other, and each represents a linear, cyclic or branched alkyl group having from 1 to 8 carbon atoms, or a linear or branched alkoxyalkyl group having from 2 to 8 carbon atoms; R 2 's may be the same as or different from each other, and each represents a linear, cyclic or branched alkyl group having from 1 to 8 carbon atoms; R 3 's may be the same as or different from each other, and each represents a linear or branched alkylene group having from 1 to 8 carbon atoms; a is from 2 to 6 in terms of average value; and p and r may be the same as or different from each other, and are each from 0 to 3 in terms of average value, provided that both p and r are not 3 simultaneously; and
(R 4 O) 3-s (R 5 ) s Si—R 6 —S k —R 7 —S k —R 6 —Si(OR 4 ) 3-t (R 5 ) t   (II)

wherein, R 4 's may be the same as or different from each other, and each represents a linear, cyclic or branched alkyl group having from 1 to 8 carbon atoms, or a linear or branched alkoxyalkyl group having from 2 to 8 carbon atoms; R 5 's may be the same as or different from each other, and each represents a linear, cyclic or branched alkyl group having from 1 to 8 carbon atoms; R 6 's may be the same as or different from each other, and each represents a linear or branched alkylene group having from 1 to 8 carbon atoms; R 7 represents any one of divalent groups represented by the general formulae (—S—R 8 —S—), (—R 9 —S m1 —R 10 —) and (—R 11 —S m2 —R 12 —S m3 —R 13 —) (wherein R 8 to R 13 may be the same as or different from each other, and each represents a divalent aliphatic hydrocarbon group having from 1 to 20 carbon atoms, a divalent alicyclic hydrocarbon group having from 1 to 20 carbon atoms, a divalent aromatic group or a divalent organic group containing a hetero element other than sulfur and oxygen; and m1, m2 and m3 may be the same as or different from each other, and are each 1 or more and less than 4 in terms of average value); k's may be the same as or different from each other, and are each from 1 to 6 in terms of average value; and s and t may be the same as or different from each other, and are each from 0 to 3 in terms of average value, provided that both s and t are not 3 simultaneously.

17 . The rubber composition according to claim 14 , wherein the silane coupling agent (C) is at least one compound selected from the group consisting of the compounds represented by the following general formulae (I) and (II):
(R 1 O) 3-p (R 2 ) p Si—R 3 —S a —R 3 —Si(OR 1 ) 3-r (R 2 ) r   (I)

wherein, R 1 's may be the same as or different from each other, and each represents a linear, cyclic or branched alkyl group having from 1 to 8 carbon atoms, or a linear or branched alkoxyalkyl group having from 2 to 8 carbon atoms; R 2 's may be the same as or different from each other, and each represents a linear, cyclic or branched alkyl group having from 1 to 8 carbon atoms; R 3 's may be the same as or different from each other, and each represents a linear or branched alkylene group having from 1 to 8 carbon atoms; a is from 2 to 6 in terms of average value; and p and r may be the same as or different from each other, and are each from 0 to 3 in terms of average value, provided that both p and r are not 3 simultaneously; and
(R 4 O) 3-s (R 5 ) s Si—R 6 —S k —R 7 —S k —R 6 —Si(OR 4 ) 3-t (R 5 ) t   (II)

wherein, R 4 's may be the same as or different from each other, and each represents a linear, cyclic or branched alkyl group having from 1 to 8 carbon atoms, or a linear or branched alkoxyalkyl group having from 2 to 8 carbon atoms; R 5 's may be the same as or different from each other, and each represents a linear, cyclic or branched alkyl group having from 1 to 8 carbon atoms; R 6 's may be the same as or different from each other, and each represe

Assignees

• Bridgestone Corp

Inventors

• Yonemoto Makiko

Classifications

• C08K5/0091

  Complexes with metal-heteroatom-bonds · CPC title

• C08J3/203

  Solid polymers with solid and/or liquid additives · CPC title

• C08K13/02 Primary

  Organic and inorganic ingredients · CPC title

• C08K5/548

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

• C08L9/06

  Copolymers with styrene · CPC title