High 1,2 content thermoplastic elastomer/oil/polyolefin composition
First Claim
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1. A thermoplastic elastomer composition comprising:
- (a) a base composition comprising;
(i) 15 to 55 weight percent of a block copolymer having at least two resinous polymerized monovinyl aromatic endblocks and a nidblock of hydrogenated polymerized butadiene wherein at least 51 mole percent of said butadiene has polymerized at the 1,2-position,(ii) 5 to 80 weight percent of a paraffinic oil, and(iii) 5 to 20 weight percent of a crystalline polyolefin; and
(b) a stabilizer, such stabilizer being present in an amount within the range of 0.01 to 4 weight percent based on the weight of said base composition.
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Abstract
A thermoplastic elastomer composition comprising a block copolymer having at least two resinous endblocks and a high 1,2-addition butadiene midblock, a paraffin oil and a crystalline polyolefin. The composition exhibits greater softness, better processability and better elastic properties as compared with similar compositions made with normal amounts of a 1,2-addition. Compositions are useful for utilities such as overmolding into hard substrates, grips, medical tubing and miscellaneous rubbery articles.
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Citations
19 Claims
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1. A thermoplastic elastomer composition comprising:
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(a) a base composition comprising; (i) 15 to 55 weight percent of a block copolymer having at least two resinous polymerized monovinyl aromatic endblocks and a nidblock of hydrogenated polymerized butadiene wherein at least 51 mole percent of said butadiene has polymerized at the 1,2-position, (ii) 5 to 80 weight percent of a paraffinic oil, and (iii) 5 to 20 weight percent of a crystalline polyolefin; and (b) a stabilizer, such stabilizer being present in an amount within the range of 0.01 to 4 weight percent based on the weight of said base composition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A composition comprising 25 to 45 weight percent of a styrene-ethylenebutylene-styrene block copolymer wherein at least 51 mole percent of said butylene block is derived from 1,2-butadiene polymerization;
- 35 to 60 weight percent of a paraffinic oil; and
10 to 15 weight percent of a crystalline polyolefin. - View Dependent Claims (17)
- 35 to 60 weight percent of a paraffinic oil; and
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18. A process comprising:
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combining a block copolymer having at least two resinous polymerized monovinyl aromatic compound endblocks and a midblock of hydrogenated polymerized butadiene wherein at least 51 mole percent of said butadiene has polymerized at the 1,2-position with a paraffinic oil; allowing time for said block copolymer to absorb said paraffinic oil to give an oil-containing block copolymer composition; tumble blending said oil-containing block copolymer composition with a crystalline polyolefin to give a block copolymer/oil/polyolefin mixture; melt extruding said mixture, wherein said block copolymer is present in an amount within the range of 15 to 55 weight percent, said oil is present in an amount within the range of 5 to 80 weight percent, and said crystalline polyolefin is present in an amount within the range of 5 to 20 weight percent based on the total weight of said block copolymer, oil and polyolefin. - View Dependent Claims (19)
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Specification