# US 2021/0079166 A1 · Polyarylene sulfide and a preparation method thereof

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- Number: US 2021/0079166 A1
- Document ID: US20210079166A1
- Status: Published application
- Kind: A1
- Application number: 17/100,448
- Filed: 2020-11-20
- Published: 2021-03-18
- Earliest claimed: 2012-08-07
- Assignees: SK Chemicals Co., Ltd.
- Applicants: SK Chemicals Co., Ltd.
- Inventors: Se-Ho LEE; Sung-Gi KIM
- Web page: https://patentgrep.com/patent/US20210079166A1

## CPC

- C08G 75/14: Polysulfides
- C08G 75/02: Polythioethers
- C08L 81/02: Polythioethers; Polythioether-ethers
- C08L 81/04: Polysulfides
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

The present invention relates to a polyarylene sulfide having more improved miscibility with other polymer materials or fillers, and a method of preparing the same. At least part of end groups of the main chain of the polyarylene sulfide is carboxyl group (—COON) or amine group (—NH2).

## Claims

### Claim at position 1

1-19. (canceled)

### Claim 20

A method of preparing a polyarylene sulfide, including:
melt-polymerizing a reactant including a diiodoaromatic compound and elemental sulfur; and
adding a compound having carboxyl group while carrying out the melt-polymerization,
wherein the compound having carboxyl group is added thereto when the degree of the polymerization reaction is progressed 90% or more, wherein the degree of polymerization reaction is determined by the ratio of present viscosity to target viscosity.

### Claim 21 (depends on 20)

The method of claim 20, wherein in the polyarylene sulfide, at least part of end groups of the main chain is carboxyl group (—COOH), and the remainder of the end groups is iodine group or unsubstituted aryl group.

### Claim 22 (depends on 20)

The method of claim 20, wherein an FT-IR spectrum of the polyarylene sulfide shows a first peak between 1400 and 1600 cm−1 and a second peak between 1600 and 1800 cm−1, wherein a height intensity of the second peak is between about 0.5% and about 10% of a height intensity of the first peak.

### Claim 23 (depends on 20)

The method of claim 20, wherein the compound having carboxyl group includes one or more compounds selected from the group consisting of 2-iodobenzoic acid, 3-iodobenzoic acid, 4-iodobenzoic acid, and 2,2′-dithiobenzoic acid.

### Claim 24 (depends on 20)

The method of claim 20, wherein the compound having carboxyl group is added thereto in the amount of 0.0001 to 5 parts by weight, based on 100 parts by weight of the diiodoaromatic compound.

### Claim 25 (depends on 20)

The method of claim 20, wherein the diiodoaromatic compound is one more compounds selected from the group consisting of diiodobenzene, diiodonaphthalene, diiodobiphenyl, diiodobisphenol, and diiodobenzophenone.

### Claim 26 (depends on 20)

The method of claim 20, wherein the melt-polymerization is carried out for 1 to 30 hours by varying the temperature and pressure from the initial reaction condition of 180 to 250° C. and 50 to 450 torr to the final reaction condition of 270 to 350° C. and 0.001 to 20 torr.

### Claim 27 (depends on 20)

The method of claim 20, further including melt-mixing the reactant including the diiodoaromatic compound and sulfur element, before the melt-polymerization.