Rubber compositions and uses thereof

Patent metadata

Field	Value
Publication number	US-10221297-B2
Application number	US-201515518984-A
Country	US
Kind code	B2
Filing date	Oct 15, 2015
Priority date	Oct 15, 2014
Publication date	Mar 5, 2019
Grant date	Mar 5, 2019

Abstract

The present disclosure is directed to rubber compositions containing a chemical additive capable of generating or enhancing strain-induced crystallization into the compositions, and tires containing the rubber compositions in one or more components such as sidewalls or treads. The chemical additive is at least one fatty acid amide compound of formula (I). As well, certain embodiments relate to methods for achieving reduced wear or improved durability in a tire tread or tire sidewall by using the chemical additives.

First claim

What is claimed is:

1. A rubber composition comprising:
(a) 80-100 phr of a synthetic conjugated diene monomer-containing polymer selected from the group consisting of polybutadiene with a cis 1,4-bond content of 85% or greater, polyisoprene, and combinations thereof,
(b) up to 20 phr of a conjugated diene monomer containing polymer or copolymer selected from the group consisting of polybutadiene with a cis 1,4-bond content of less than 85%, styrene-butadiene copolymer, neoprene, isobutylene, natural rubber, and combinations thereof,
(c) 1-10 phr of at least one fatty acid amide compound of formula (I),
(d) 1 to 20 phr of at least one processing oil,
(e) 0-100 phr of at least one reinforcing filler,
wherein formula (I) is R 1 [C(═O)N(H)R 2 ] x ,
where x=2 or 3, and each [C(═O)N(H)R 2 ] is the same or different, R 1 is selected from alkyl of C1 to C21, alkenyl of C2 to C21, cycloalkyl of C3 to C21, aromatic of C5 to C20, and alkaryl of C7 to C30,
R 2 is selected from H, alkyl of C1 to C21, alkenyl of C2 to C21 and cycloalkyl of C3 to C21, aromatic of C5 to C20, alkaryl of C7 to C30, R 3 N(H)C(═O)R 4 with R 3 bonded to the N of formula (I), and R 3 N(R 5 ) 2 with each R 5 independently selected from the group consisting of H, alkyl of C1 to C20, alkenyl of C2 to C20, cycloalkyl of C3 to C20, aromatic of C5 to C20 and alkaryl of C7 to C20 and R 2 or the terminal R 5 therein optionally substituted with one or more OH,
R 3 is selected from alkyl of C1 to C20, alkenyl of C2 to C20, and cycloalkylene of C3 to C20,
R 4 is selected from R 1 , alkyl of C1 to C20, alkenyl of C2 to C20, cycloalkyl of C3 to C20, aromatic of C5 to C20 and alkaryl of C7 to C20,
wherein upon curing the rubber composition meets at least one of (i) or (ii), as follows:
(i) exhibits reduced wear as exhibited by having a wear index (measured under at least one slip percentage in the range of 10-75%) that is 110% or higher, based upon a comparative rubber compound that contains no fatty acid amide compound of formula (I) but contains additional processing oil in a phr amount equal to the amount of the at least one fatty acid amide in the synthetic conjugated diene monomer containing polymer composition, and
(ii) exhibits strain-induced crystallization, and
wherein the composition contains no zinc carboxylate curative.

2. The rubber composition according to claim 1 , wherein x=3.

3. The rubber composition according to claim 1 , wherein R 1 is phenyl, x=3.

4. The rubber composition according to claim 1 , wherein the at least one fatty acid amide compound of formula (I) is present in an amount of 2 to 5 phr.

5. The rubber composition according to any of claim 1 , wherein the composition exhibits a wear index at 25% slip that is at least 15% higher than the wear index of the comparative rubber compound.

6. The rubber composition according to claim 1 , wherein the composition exhibits a wear index at 25% slip that is at least 20% higher than the wear index of the comparative rubber compound.

7. The rubber composition according to claim 1 , wherein (a) is present in an amount of 90-100 phr.

8. The rubber composition according to claim 1 , wherein (a) comprises 100 phr of polybutadiene having a cis 1,4-bond content of 85% or greater.

9. The rubber composition according to claim 1 , wherein (a) comprises polybutadiene having a cis 1,4-bond content of 90% or greater.

10. The rubber composition according to claim 1 , wherein (c) is selected from the group consisting of: octadecanamide, N,N′-ethylenebis(stearamide), N-(2-(diethylamino)ethyl)stearamide, stearoyl ethanolamide, oleoyl ethyl amide, N-cyclohexanecarbonyltetradecylamine, N-palmitoyl dopamine, arachidoyl ethanolamide, docosanoyl ethanolamide, and combinations thereof.

11. The rubber composition according to claim 1 , wherein the combined amount of (c) and (d) is no more than 20 phr.

12. The rubber composition according to claim 1 , further comprising:
(f) a cure package.

13. A method of achieving reduced wear or improved durability in a tire tread or tire sidewall, the method comprising incorporating the rubber composition according to claim 12 into a tire tread or sidewall.

14. A method of achieving strain-induced crystallization in a synthetic rubber-based composition comprising use of the rubber composition according to claim 12 , wherein the at least one fatty acid amide compound of (c) is mixed with (a), (b), (d), (e) and (f), and upon curing the composition exhibits strain-induced crystallization.

15. A rubber composition comprising:
(a) 80-100 phr of a synthetic conjugated diene monomer-containing polymer selected from the group consisting of polybutadiene with a cis 1,4-bond content of 85% or greater, polyisoprene, and combinations thereof,
(b) up to 20 phr of a conjugated diene monomer containing polymer or copolymer selected from the group consisting of polybutadiene with a cis 1,4-bond content of less than 85%, styrene-butadiene copolymer, neoprene, isobutylene, natural rubber, and combinations thereof,
(c) 1-10 phr of at least one fatty acid amide compound of formula (I),
(d) 1 to 20 phr of at least one processing oil,
(e) 0-100 phr of at least one reinforcing filler,
wherein formula (I) is R 1 [C(═O)N(H)R 2 ] x ,
where x=2 or 3, and each [C(═O)N(H)R 2 ] is the same or different,
R 1 is selected from alkyl of C1 to C21, alkenyl of C2 to C21 and cycloalkyl of C3 to C21, aromatic of C5 to C20, alkaryl of C7 to C30,
R 2 is selected from H, alkyl of C1 to C21, alkenyl of C2 to C21 and cycloalkyl of C3 to C21, aromatic of C5 to C20, alkaryl of C7 to C30, R 3 N(H)C(═O)R 4 with R 3 bonded to the N of formula (I), and R 3 N(R 5 ) 2 with each R 5 independently selected from the group consisting of H, alkyl of C1 to C20, alkenyl of C2 to C20, cycloalkyl of C3 to C20, aromatic of C5 to C20 and alkaryl of C7 to C20 and R 2 or the terminal R 5 therein optionally substituted with one or more OH,
R 3 is selected from alkyl of C1 to C20, alkenyl of C2 to C20, and cycloalkylene of C3 to C20,
R 4 is selected from R 1 , alkyl of C1 to C20, alkenyl of C2 to C20, cycloalkyl of C3 to C20, aromatic of C5 to C20 and alkaryl of C7 to C20,
wherein the combined amount of (c) and (d) is no more than 20 phr,
wherein upon curing the rubber composition meets at least one of (i) or (ii), as follows:
(ii) exhibits reduced wear as exhibited by having a wear index (measured under at least one slip percentage in the range of 10-75%) that is 110% or higher, based upon a comparative rubber compound that contains no fatty acid amide compound of formula (I) but contains additional processing oil in a phr amount equal to the amount of the at least one fatty acid amide in the synthetic conjugated diene monomer containing polymer composition, and
(ii) exhibits strain-induced crystallization, and
wherein the composition contains no zinc carboxylate curative.

16. A rubber composition comprising:
(a) 80-100 phr of a synthetic polybutadiene with a cis 1,4-bond content of 90% or greater,
(b) up to 20 phr of a conjugated diene monomer containing polymer or copolymer selected from the group consisting of polybutadiene with a cis 1,4-bond content of less than 85%, styrene-butadiene copolymer, neoprene, isobutylene, natural rubber, and combinations thereof,
(c) 1-10 phr of at least one fatty acid amide compound of formula (I),
(d) 1 to 20 phr of at least one processing oil,
(e) 0-100 phr of at least one reinforcing filler,
wherein formula (I) is R 1 [C(═O)N(H)R 2 ] x ,
where x=2 or 3, and each [C(═O)N(H)R 2 ] is the same or different,
R 1 is selected fro

Assignees

• Bridgestone Corp
• Randall Amy M
• Yan Yuan Yong
• Mccauley Kevin M

Inventors

• Randall Amy M
• Yan Yuan-Yong
• Mccauley Kevin M

Classifications

• C08K3/22

  of metals · CPC title

• C08K2003/2296

  of zinc · CPC title

• C08K3/013

  Fillers, pigments or reinforcing additives · CPC title

• C08L9/00 Primary

  Compositions of homopolymers or copolymers of conjugated diene hydrocarbons · CPC title

• B60C1/0016

  Compositions of the tread · CPC title