Rubber composition with multiple reinforcing resins
View Patent ↗A tire component comprising a rubber composition having a highly unsaturated diene elastomer and a reinforcing filler with a first methylene acceptor selected from 3-hydroxydiphenylamine, 4-hydroxydiphenylamine or combinations thereof; a second methylene acceptor selected from a Novolac resin, diphenylolmethane, diphenylolethane diphenylolpropane, diphenylolbutane, a naphthol, a cresol or combinations thereof and a methylene donor. A method for manufacturing a tire component includes mixing together components of a rubber composition into a non-productive mix, the components including a highly unsaturated diene elastomer, a reinforcing filler, a first methylene acceptor selected from 3-hydroxydiphenylamine, 4-hydroxydiphenylamine or combinations thereof and a second methylene acceptor selected from a Novolac resin, diphenylolmethane, diphenylolethane diphenylolpropane, diphenylolbutane, a naphthol, a cresol or combinations thereof; and mixing a methylene donor and a vulcanizing agent into the non-productive mix to convert the non-productive mix to a productive mix.
1. A rubber composition that is based upon a cross-linkable elastomer composition, the cross-linkable rubber composition comprising, per 100 parts by weight of rubber (phr):
a highly unsaturated diene elastomer;
a reinforcing filler;
a first methylene acceptor selected from 3-hydroxydiphenylamine, 4-hydroxydiphenylamine or combinations thereof;
a second methylene acceptor selected from a novolac resin, diphenylolmethane, diphenylolethane diphenylolpropane, diphenylolbutane, a naphthol, a cresol or combinations thereof; and
a methylene donor.
2. A tire component of a tire, the tire component comprising a rubber composition that is based upon a cross-linkable elastomer composition, the cross-linkable rubber composition comprising, per 100 parts by weight of rubber (phr):
a highly unsaturated diene elastomer;
a reinforcing filler;
a first methylene acceptor selected from 3-hydroxydiphenylamine, 4-hydroxydiphenylamine or combinations thereof;
a second methylene acceptor selected from a novolac resin, diphenylolmethane, diphenylolethane diphenylolpropane, diphenylolbutane, a naphthol, a cresol or combinations thereof; and
a methylene donor.
3. The tire component of claim 2 , wherein a ratio of the first methylene acceptor to the second methylene acceptor is between 4:1 and 1:4 by weight.
4. The tire component of claim 2 , wherein a ratio of the first methylene acceptor to the second methylene acceptor is between 2:1 and 1:2 by weight.
5. The tire component of claim 2 , wherein the methylene donor is selected from hexamethylenetetramine, hexamethoxymethylmelamine or combinations thereof.
6. The tire component of claim 2 , wherein a total amount of the first and second methylene acceptors is between 2 phr and 30 phr.
7. The tire component of claim 6 , wherein a total amount of the first and second methylene acceptors is between 3 phr and 15 phr.
8. The tire component of claim 2 , wherein the second methylene acceptor is a novolac resin.
9. The tire claim 2 , wherein the first methylene acceptor is 3-hydroxydiphenylamine.
10. The tire claim 2 , wherein the first methylene acceptor is 4-hydroxydiphenylamine.
11. The tire component of claim 2 , wherein the methylene donor is in an amount of between 0.5 phr and 15 phr.
12. The tire component of claim 11 , wherein the methylene donor is in an amount of between 1 phr and 10 phr.
13. The tire component of claim 2 , wherein a ratio of the total amount of first and second methylene acceptors to the methylene donor is between 1:1 and 10:1 by weight.
14. The tire component of claim 2 , wherein highly unsaturated diene elastomer is selected from a polybutadiene, a synthetic polyisoprene, a natural rubber, a butadiene-styrene copolymer or combinations thereof.
15. The tire component of claim 2 , wherein the reinforcing filler is selected from a carbon black, a silica or combinations thereof.
16. The tire component of claim 2 , wherein the tire component is a tire tread.
17. The tire component of claim 2 , wherein the tire component is a bead component of the tire.
18. A method for manufacturing a tire component, the method comprising:
mixing together components of a rubber composition into a non-productive mix, the components including a highly unsaturated diene elastomer, a reinforcing filler, a first methylene acceptor selected from 3-hydroxydiphenylamine, 4-hydroxydiphenylamine or combinations thereof and a second methylene acceptor selected from a Novolac resin, diphenylolmethane, diphenylolethane diphenylolpropane, diphenylolbutane, a naphthol, a cresol or combinations thereof;
cooling the non-productive mix;
mixing a methylene donor and a vulcanizing agent into the non-productive mix to convert the non-productive mix to a productive mix;
forming the tire component from the productive mix.
19. The method of claim 18 , wherein a ratio of the first methylene acceptor to the second methylene acceptor is between 4:1 and 1:4 by weight.
20. The method of any one of claim 18 , wherein the methylene donor is selected from hexamethylenetetramine, hexamethoxymethylmelamine or combinations thereof.
21. The method of any one of claim 18 , wherein the second methylene acceptor is a novolac resin.