# US 5,705,556 A · Modified styrenic block copolymer compounds having improved elastic performance

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- Number: US 5,705,556 A
- Document ID: US5705556A
- Status: Granted
- Kind: A
- Application number: 08/731,902
- Filed: 1996-10-22
- Granted: 1998-01-06
- Earliest claimed: 1996-03-05
- Assignees: Shell Oil Company
- Inventors: Lie Khong Djiauw; Rodney Ray Pease
- Web page: https://patentgrep.com/patent/US5705556A

## CPC

- C08L 23/02: not modified by chemical after-treatment
- C08L 71/123: {not modified by chemical after-treatment}
- C08L 23/06: Polyethylene
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

An extrudable elastomeric composition for making elastic fibers or films, the composition including an elastomeric block copolymer, a polyphenylene ether, a polyolefin, and a tackifying resin. The composition has excellent stress relaxation at temperatures above 30.degree. C.

## Claims

### Claim 1

An elastomeric composition, comprising:
from 25% to 75% by weight of a block copolymer having at least two monoalkenyl arene blocks separated by a hydrogenated conjugated diene block;
from 5% to 35% by weight of a polyphenylene ether having an intrinsic viscosity from 0.09 to 0.35 deciliters per gram as determined in chloroform at 25.degree. C.;
from 15% to 55% by weight of a polyolefin;
from 15% to 30% by weight of a tackifying resin; and
from 0% to 15% by weight of an extending oil.

### Claim 2 (depends on 1)

The composition of claim 1, wherein the block copolymer has the structure polystyrene-poly(ethylene-butylene)-polystyrene, polystyrene-poly(ethylene-propylene)-polystyrene, or polystyrene-poly(ethylene-propylene)-polystyrene-poly(ethylene-propylene).

### Claim 3 (depends on 1)

The composition of claim 1, wherein the monoalkenyl arene content of the block copolymer is from 13% to 22% and the amount of the polyphenylene ether is from 50% to 200% by weight of the monoalkenyl arene in the block copolymer.

### Claim 4 (depends on 1)

The composition of claim 1, wherein the polyphenylene ether is poly-(2,6-dimethyl-1,4-phenylene)ether.

### Claim 5 (depends on 1)

The composition of claim 1, wherein the polyolefin is a low density polyethylene, a linear low density polyethylene, a metallocene polyetylene or a combination of these polyolefin resins.

### Claim 6

An elastomeric composition, comprising:
from 25% to 75% by weight of a block copolymer having at least two polystyrene blocks separated by a hydrogenated conjugated diene block, wherein the block copolymer has a number average molecular weight from 62,000 to 85,000, each polystyrene block has a number average molecular weight from 5,200 to 8,000;
from 5% to 35% by weight of a polyphenylene ether having an intrinsic viscosity from 0.09 to 0.35 deciliters per gram as measured in chloroform at 25.degree. C.;
from 15% to 55% by weight of a polyolefin;
from 15% to 30% by weight of a tackifying resin; and
from 0% to 15% by weight of an extending oil.

### Claim 7 (depends on 6)

The composition of claim 6, wherein the block copolymer has the structure polystyrene-poly(ethylene-butylene)-polystyrene, polystyrene-poly(ethylene-propylene)-polystyrene, or polystyrene-poly(ethylene-propylene)-polystyrene-poly(ethylene-propylene).

### Claim 8 (depends on 7)

The composition of claim 7, wherein the polystyrene content of the block copolymer is from 13% to 22% and the amount of the polyphenylene ether is from 50% to 200% by weight of the polystyrene in the block copolymer.

### Claim 9 (depends on 8)

The composition of claim 8, wherein the polyphenylene ether is poly-(2,6-dimethyl-1,4-phenylene)ether having an intrinsic viscosity from 0.09 to 0.350 deciliters per gram as measured in chloroform at 25.degree. C.

### Claim 10 (depends on 9)

The composition of claim 9, wherein the polyolefin is a low density polyethylene, a linear low density polyethylene, a metallocene polyetylene or a combination of these polyolefin resins.