Rubber composition
The purpose of the present invention is to provide a rubber composition in which a rubber viscosity during kneading is low and processability is good though the rubber composition comprises a white filler, and fuel efficiency and abrasion resistance are good. A rubber composition comprising a rubber component, a white filler and a compound represented by the following formula (1), where R 1 represents an alkyl group or alkenyl group having 8 to 14 carbon atoms, the alkyl group or alkenyl group may be linear, branched or cyclic, and R 2 represents a hydroxyalkyl group or a hydroxyalkyl group having an oxyalkylene unit.
1. A rubber composition, comprising:
a rubber component;
a white filler; and
a compound of formula (1),
where R 1 represents an alkyl group or alkenyl group having 8 to 14 carbon atoms, the alkyl group or alkenyl group may be linear, branched or cyclic, and R 2 represents a hydroxyalkyl group or a hydroxyalkyl group having an oxyalkylene unit,
wherein a content of the compound of formula (1) is not less than 0.5 part by mass based on 100 parts by mass of the rubber component.
2. The rubber composition of claim 1 , wherein the compound of the formula (1) is coconut oil fatty acid N-methylethanolamide.
3. The rubber composition of claim 1 , wherein the white filler is silica.
4. The rubber composition of claim 1 , further comprising:
an antioxidant of formula (3) or an antioxidant of formula (4),
where each of R 4 s independently represents a C 1 to C 20 alkyl group which may have a substituent, a phenyl group which may have a substituent or a benzyl group which may have a substituent, and R 5 is a C 1 to C 10 alkyl group which may have a substituent or a C 5 to C 12 cycloalkyl group which may have a substituent,
where each of R 6 s independently represents a C 1 to C 10 alkyl group.
5. The rubber composition of claim 1 , wherein the rubber composition comprises no antioxidant having dihydroquinoline.
6. The rubber composition of claim 2 , wherein the white filler is silica.
7. The rubber composition of claim 2 , further comprising:
an antioxidant of formula (3) or an antioxidant of formula (4),
where each of R 4 s independently represents a C 1 to C 20 alkyl group which may have a substituent, a phenyl group which may have a substituent or a benzyl group which may have a substituent, and R 5 is a C 1 to C 10 alkyl group which may have a substituent or a C 5 to C 12 cycloalkyl group which may have a substituent,
where each of R 6 s independently represents a C 1 to C 10 alkyl group.
8. The rubber composition of claim 2 , wherein the rubber composition comprises no antioxidant having dihydroquinoline.
9. The rubber composition of claim 3 , further comprising:
an antioxidant of formula (3) or an antioxidant of formula (4),
where each of R 4 s independently represents a C 1 to C 20 alkyl group which may have a substituent, a phenyl group which may have a substituent or a benzyl group which may have a substituent, and R 5 is a C 1 to C 10 alkyl group which may have a substituent or a C 5 to C 12 cycloalkyl group which may have a substituent,
where each of R 6 s independently represents a C 1 to C 10 alkyl group.
10. The rubber composition of claim 3 , wherein the rubber composition comprises no antioxidant having dihydroquinoline.
11. The rubber composition of claim 4 , wherein the rubber composition comprises no antioxidant having dihydroquinoline.
12. The rubber composition of claim 6 , further comprising:
an antioxidant of formula (3) or an antioxidant of formula (4),
where each of R 4 s independently represents a C 1 to C 20 alkyl group which may have a substituent, a phenyl group which may have a substituent or a benzyl group which may have a substituent, and R 5 is a C 1 to C 10 alkyl group which may have a substituent or a C 5 to C 12 cycloalkyl group which may have a substituent,
where each of R 6 s independently represents a C 1 to C 10 alkyl group.
13. The rubber composition of claim 6 , wherein the rubber composition comprises no antioxidant having dihydroquinoline.
14. The rubber composition of claim 7 , wherein the rubber composition comprises no antioxidant having dihydroquinoline.
15. The rubber composition of claim 9 , wherein the rubber composition comprises no antioxidant having dihydroquinoline.
16. The rubber composition of claim 12 , wherein the rubber composition comprises no antioxidant having dihydroquinoline.
17. The rubber composition of claim 1 , wherein the content of the compound of formula (1) is not less than 1.0 part by mass based on 100 parts by mass of the rubber component.
18. The rubber composition of claim 1 , wherein the content of the compound of formula (1) is not more than 10 parts by mass based on 100 parts by mass of the rubber component.
19. The rubber composition of claim 17 , wherein the content of the compound of formula (1) is not more than 10 parts by mass based on 100 parts by mass of the rubber component.
20. The rubber composition of claim 1 , wherein the content of the compound of formula (1) is not more than 5 parts by mass based on 100 parts by mass of the rubber component.