Elastomeric material compositions obtained from castor oil and epoxidized soybean oil
View Patent ↗Elastomers are formed from castor oil and/or ricinoleic acid estolides and a polyester formed from an epoxidized vegetable oil such as ESO and a polycarboxylic acid such as sebacic acid, optionally in the presence of a peroxide initiator, or include crosslinked reaction products derived from ricinoleic acid or castor oil estolides, epoxy group-containing compounds such as epoxy resins and/or epoxidized vegetable oil, epoxy hardeners such as polyamine and polycarboxylic acid hardeners, thermally activated free radical initiators such as peroxides, and optionally but preferably include fillers such as limestone or wood flour. The elastomers can be prepared using a two-step, solvent-less procedure at elevated or ambient temperatures. These predominantly “all-natural” elastomers have physical properties comparable to conventional petroleum-based elastomers and composites and exhibit good flexibility, resiliency, abrasion resistance and inertness to hydrolysis. The resulting elastomers display good mechanical strength and resiliency, are resistant to abrasion and hydrolysis, and can be processed into sheet materials, which makes them attractive as floor covering components.
1. A composition comprising
a) a ricinoleic acid component selected from the group consisting of castor oil, ricinoleic acid, castor oil estolide, ricinoleic acid estolide and combinations thereof,
b) an epoxidized vegetable oil, and
c) a polycarboxylic acid crosslinker.
2. The composition of claim 1 , further comprising an additional component selected from the group consisting of a crosslinking catalyst, a filler and combinations thereof.
3. The composition of claim 2 , wherein the crosslinking catalyst is a free radical generating catalyst.
4. The composition of claim 3 , wherein the crosslinking catalyst is a thermally activated free radical initiator.
5. The composition of claim 1 , wherein the composition further comprises a free radical generating catalyst selected from the group consisting of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 1,4-di-(2-tert-butylperoxyisopropyl) benzene, tert-butyl cumyl peroxide, di-tert-butyl peroxide, 2,4,4-trimethylpentyl-2-hydroperoxide, diisopropylbenzene monohydroperoxide, cumyl hydroperoxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane peroxide, methyl ethyl ketone peroxide, dicumyl peroxide, dibenzoyl peroxide and combinations thereof.
6. The composition of claim 2 , wherein the filler is selected from the group consisting of wood flour, limestone, titanium dioxide, kaolin clay and combinations thereof.
7. The composition of claim 2 , wherein the filler comprises powdered limestone.
8. The composition of claim 1 , wherein the epoxidized vegetable oil is epoxidized soybean oil.
9. The composition of claim 1 , wherein the crosslinker comprises a polycarboxylic acid and another crosslinker selected from the group consisting of a polyfunctional amine, a polyacrylate and combinations thereof.
10. The composition of claim 1 , wherein the polycarboxylic acid is selected from the group consisting of sebacic acid, citric acid and combinations thereof.
11. The composition of claim 9 , wherein the polyfunctional amine is selected from the group consisting of isophoronediamine, 1,2-diaminocyclohexane, bis-p-aminocyclohexylmethane, 1,3-bis(aminomethylcyclohexanemine) cycloaliphatic diamines, diethylenetriamine, 4,4′-isopropylidenediamine, 1,4-diaminobutane, triethylene glycol diamine, and combinations thereof.
12. The composition of claim 1 , wherein the epoxy group-containing compound comprises a combination of an epoxy resin and an epoxidized vegetable oil.
13. The composition of claim 1 , wherein the ricinoleic acid component is a ricinoleic acid estolide.
14. The composition of claim 13 , wherein the ricinoleic acid component is an estolide prepared by enzyme-catalyzed polymerization.
15. The composition of claim 14 , wherein the enzyme is a lipase derived from Candida Antarctica B.
16. A composition comprising the reaction product of the composition of claim 1 .
17. A composition comprising the reaction product of a composition comprising an additional component selected from the group consisting of a crosslinking catalyst, a filler and combinations thereof, and the composition of claim 16 .
18. The composition of claim 17 , wherein the additional component is a crosslinking catalyst selected from the group consisting of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 1,4-di-(2-tert-butylperoxyisopropyl) benzene, tert-butyl cumyl peroxide, di-tert-butyl peroxide, 2,4,4-trimethylpentyl-2-hydroperoxide, diisopropylbenzene monohydroperoxide, cumyl hydroperoxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane peroxide, methyl ethyl ketone peroxide, dicumyl peroxide, dibenzoyl peroxide and combinations thereof.
19. The composition of claim 16 , wherein the crosslinker comprises a polycarboxylic acid and another crosslinker selected from the group consisting of a polyfunctional amine, a polyacrylate and combinations thereof.
20. The composition of claim 19 , wherein the other crosslinker is selected from the group consisting of isophoronediamine, 1,2-diaminocyclohexane, bis-p-aminocyclohexylmethane, 1,3-bis(aminomethylcyclohexanamine)cycloaliphatic diamines, diethylenetriamine, 4,4′-isopropylidenediamine, 1,4-diaminobutane, triethylene glycol diamine and combinations thereof.
21. The composition of claim 19 , wherein the epoxidized vegetable oil is epoxidized soybean oil.
22. The composition of claim 19 , wherein the ricinoleic acid component is an estolide prepared by enzyme-catalyzed polymerization.
23. The composition of claim 5 , wherein the free radical generating catalyst is 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane.
24. The composition of claim 10 , further comprising a free radical generating catalyst selected from the group consisting of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 1,4-di-(2-tert-butylperoxyisopropyl)benzene, tert-butyl cumyl peroxide, di-tert-butyl peroxide, 2,4,4-trimethylpentyl-2-hydroperoxide, diisopropylbenzene monohydroperoxide, cumyl hydroperoxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane peroxide, methyl ethyl ketone peroxide, dicumyl peroxide, dibenzoyl peroxide and combinations thereof.
25. The composition of claim 24 , wherein the free radical generating catalyst is 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane.
26. A composition comprising
a) a ricinoleic acid component selected from the group consisting of castor oil, ricinoleic acid, castor oil estolide, ricinoleic acid estolide and combinations thereof,
b) an epoxy group-containing compound selected from the group consisting of epoxy resins, epoxidized vegetable oils and combinations thereof,
c) a crosslinker selected from the group consisting of sebacic acid, citric acid and combinations thereof, and
d) a free radical generating catalyst selected from the group consisting of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 1,4-di-(2-tert-butylperoxyisopropyl)benzene, tert-butyl cumyl peroxide, di-tert-butyl peroxide, 2,4,4-trimethylpentyl-2-hydroperoxide, diisopropylbenzene monohydroperoxide, cumyl hydroperoxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane peroxide, methyl ethyl ketone peroxide, dicumyl peroxide, dibenzoyl peroxide and combinations thereof.
27. The composition of claim 26 , wherein the epoxy group-containing compound is epoxidized soybean oil.
28. A composition comprising
a) a fatty acid component selected from the group consisting of castor oil, castor oil estolide, ricinoleic acid estolide and combinations thereof,
b) an epoxy group-containing compound selected from the group consisting of epoxy resins, epoxidized vegetable oils and combinations thereof, and
c) a crosslinker selected from the group consisting of sebacic acid, citric acid and combinations thereof.
29. The composition of claim 28 , wherein the epoxy group-containing compound is epoxidized soybean oil.
30. The composition of claim 28 , further comprising a free radical generating catalyst selected from the group consisting of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 1,4-di-(2-tert-butylperoxyisopropyl)benzene, tert-butyl cumyl peroxide, di-tert-butyl peroxide, 2,4,4-trimethylpentyl-2-hydroperoxide, diisopropylbenzene monohydroperoxide, cumyl hydroperoxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane peroxide, methyl ethyl ketone peroxide, dicumyl peroxide, dibenzoyl peroxide and combinations thereof.
31. The composition of claim 16 , wherein the epoxy group-containing compound comprises a combination of an epoxy resin and an epoxidized vegetable oil.
32. The composition of claim 16 , wherein the ricinoleic acid component is a ricinoleic acid estolide.
33. The composition of claim 32 , wherein the ricinoleic acid component is an estolide prepared by enzyme-catalyzed polymerization.
34. The composition of claim 33 , wherein the enzyme is a lipase derived from Candida Antarctica B.