Gelatinous elastomer
First Claim
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1. An elastomeric material comprising:
- a plasticizer selected from the group consisting of oils and polybutenes, and a SEEPS triblock copolymer of the general configuration A-B-A;
wherein the plasticizer and copolymer are mixed to form a gel;
wherein A is selected from the group consisting of monoalkenylarene polymers;
wherein B is a hydrogenated polymer including a plurality of hydrogenated isoprene monomers and a plurality of hydrogenated butadiene monomers;
wherein said SEEPS triblock copolymer has a weight average molecular weight of about 125,000 to 175,000 wherein said SEEPS triblock copolymer has a solution viscosity of about 50 to about 150 cps @ 30 degrees C. when in a 7.5% solution in toluene;
wherein said plasticizer associates with said hydrogenated polymer B;
wherein said SEEPS triblock copolymer has a measurable percent elongation at break;
wherein said plasticizer tends to increase the percent elongation at break of said SEEPS triblock copolymer;
wherein said SEEPS triblock copolymer has a rigidity measurable on the Gram Bloom scale; and
wherein said plasticizer tends to decrease the Gram Bloom rigidity of said SEEPS triblock copolymer.
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Abstract
An improved gelatinous elastomer is disclosed which uses an A-B-A triblock copolymer having a molecular weight in the range of 125,000 to 175,000, or about 150,000, and a plasticizer.
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Citations
29 Claims
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1. An elastomeric material comprising:
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a plasticizer selected from the group consisting of oils and polybutenes, and a SEEPS triblock copolymer of the general configuration A-B-A;
wherein the plasticizer and copolymer are mixed to form a gel;
wherein A is selected from the group consisting of monoalkenylarene polymers;
wherein B is a hydrogenated polymer including a plurality of hydrogenated isoprene monomers and a plurality of hydrogenated butadiene monomers;
wherein said SEEPS triblock copolymer has a weight average molecular weight of about 125,000 to 175,000 wherein said SEEPS triblock copolymer has a solution viscosity of about 50 to about 150 cps @ 30 degrees C. when in a 7.5% solution in toluene;
wherein said plasticizer associates with said hydrogenated polymer B;
wherein said SEEPS triblock copolymer has a measurable percent elongation at break;
wherein said plasticizer tends to increase the percent elongation at break of said SEEPS triblock copolymer;
wherein said SEEPS triblock copolymer has a rigidity measurable on the Gram Bloom scale; and
wherein said plasticizer tends to decrease the Gram Bloom rigidity of said SEEPS triblock copolymer. - View Dependent Claims (2, 3, 4, 5)
wherein at least one of said components is a hydrocarbon resin; and
wherein at least one of said components is selected from the group consisting of naturally derived oils, synthetic oils, and liquid oligomers.
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5. An elastomeric material as recited in claim 1, wherein said solution viscosity is about 95 to 115 cps.
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6. An elastomeric material comprising:
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a plasticizer and a SEEPS triblock copolymer of the general configuration A-B-A and having a weight average molecular weight of from about 125,000 to 175,000;
wherein A is a non-elastomeric polymer and B is a hydrogenated polymer selected from the group consisting of ethylene/propylene, ethylene/butylene, and a combination thereof;
wherein the combined weights of said ethylene/propylene and said ethylene/butylene comprise more than about 50 weight percent of said hydrogenated polymer B;
wherein said plasticizer associates with said hydrogenated polymer B;
wherein said SEEPS triblock copolymer has a measurable percent elongation at break;
wherein said plasticizer tends to increase the percent elongation at break of said SEEPS triblock copolymer;
wherein said SEEPS triblock copolymer has a rigidity measurable on the Gram Bloom scale; and
wherein said plasticizer tends to decrease the Gram Bloom rigidity of said SEEPS triblock copolymer. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
wherein each of said mid block B is covalently linked to both of said end blocks A; wherein said end blocks A are non-elastomeric polymers;
wherein said mid block B is an elastomeric polymer.
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15. A material as recited in claim 6 further comprising an antioxidant.
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16. A material as recited in claim 6,
wherein A is a polymer selected from the group consisting of monoalkenylarene polymers; -
wherein B is a hydrogenated polymer comprising a plurality of covalently linked conjugated diene monomers; and
wherein at least one of said conjugated diene monomers is isoprene and at least one of said conjugated diene monomers is butadiene.
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17. A material as recited in claim 16 wherein said plasticizer and said copolymer are mixed to form a gelatinous thermoplastic elastomer.
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18. A material as recited in claim 17 wherein said gel has an oil to copolymer ratio of from about 1:
- 1 to about 8;
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- 1 to about 8;
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19. A material as recited in claim 17 wherein the material can be readily pour-cast at about 375 degrees F. when melt blended in a 3:
- 1 ratio of said plasticizer to said SEEPS triblock copolymer.
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20. A material as recited in claim 16 wherein said copolymer has a weight average molecular weight of about 150,000.
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21. A material as recited in claim 16 wherein said plasticizer includes a polymer.
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22. A material as recited in claim 17 further comprising a quantity of spherical objects.
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23. A material as recited in claim 22 wherein said spherical objects are microspheres.
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24. A material as recited in claim 16
wherein each of said mid block B is covalently linked to both of said end blocks A; -
wherein said end blocks A are non-elastomeric polymers;
wherein said mid block B is an elastomeric polymer.
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25. A material as recited in claim 16 further comprising an antioxidant.
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26. A material as recited in claim 16, wherein the material has a durometer of about 15 Shore A or lower.
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27. An elastomeric material comprising:
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a SEEPS triblock copolymer elastomer of the configuration A-B-A and having a weight average molecular weight of from about 125,000 to 175,000, block A being a non-elastomeric polymer and block B being an elastomeric polymer, and a plasticizer combined with said SEEPS triblock copolymer elastomer to form a visco-elastic material, said plasticizer being compatible with said B block. - View Dependent Claims (28, 29)
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Specification