# US 10,865,274 B2 · Poly(alkylene carbonate) resin composition, preparation method thereof, molded article formed therefrom, and preparation method of molded article using the same

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- Number: US 10,865,274 B2
- Document ID: US10865274B2
- Status: Granted
- Kind: B2
- Application number: 16/067,802
- Filed: 2017-05-31
- Published: 2019-01-10
- Granted: 2020-12-15
- Earliest claimed: 2016-05-31
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Sung-Kyoung Kim; Hyun Min Kim; Hyun Ju Cho; Seung Young Park
- Web page: https://patentgrep.com/patent/US10865274B2

## CPC

- C08G 64/32: using carbon dioxide
- C08G 64/0208: {saturated}
- C08G 64/34: and cyclic ethers
- C08J 3/11: from solid polymers
- C08J 5/18: Manufacture of films or sheets
- C08L 69/00: Compositions of polycarbonates; Compositions of derivatives of polycarbonates
- C08L 77/00: Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain (of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08); Compositions of derivatives of such polymers
- C08J 2369/00: Characterised by the use of polycarbonates; Derivatives of polycarbonates
- C08J 2477/00: Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08L 2203/16: used for films
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Provided are a poly(alkylene carbonate) resin composition having improved mechanical properties, heat resistance, and processability, a preparation method of the poly(alkylene carbonate) resin composition, a molded article formed by using the composition, and a preparation method of the molded article, in which the poly(alkylene carbonate) resin composition includes poly(alkylene carbonate) having a weight average molecular weight of 100,000 g/mol to 500,000 g/mol and polyamide having a melting point of 180° C. to 194° C. at a weight ratio of 95:5 to 75:25.

## Claims

### Claim 1

A poly(alkylene carbonate) resin composition comprising a poly(alkylene carbonate) having a weight average molecular weight of 100,000 g/mol to 500,000 g/mol and a polyamide having a melting point of 180° C. to 194° C. at a weight ratio of 95:5 to 75:25,
wherein the poly(alkylene carbonate) is polyethylene carbonate, and
wherein the polyamide has relative viscosity of 3.5 to 5 as measured according to ISO 307 and calculated by the Huggins method after dissolving polyamide in 96% (m/m) of sulfuric acid at a concentration of 1% (m/v).

### Claim 2 (depends on 1)

The poly(alkylene carbonate) resin composition of claim 1, wherein the polyamide is in a pellet form having a diameter of 1 mm to 5 mm, and is blended with the poly(alkylene carbonate).

### Claim 3 (depends on 1)

The poly(alkylene carbonate) resin composition of claim 1, wherein the polyamide includes one or more pellets selected from the group consisting of nylon-6 pellets, nylon-66 pellets, nylon-11 pellets, nylon-12 pellets, nylon-6/66 pellets, nylon-6/6T pellets, nylon-6I/6 T pellets, nylon-66/6T pellets, and nylon-6I pellets.

### Claim 4 (depends on 1)

The poly(alkylene carbonate) resin composition of claim 1, wherein the poly(alkylene carbonate) and the polyamide are dry-blended.

### Claim 5

A method of preparing a poly(alkylene carbonate) resin composition, the method comprising the steps of:
preparing a poly(alkylene carbonate) having a weight average molecular weight of 100,000 g/mol to 500,000 g/mol by polymerizing monomers including an alkylene oxide and carbon dioxide in the presence of a catalyst; and
dry-blending the prepared poly(alkylene carbonate) with a polyamide having a melting point of 180° C. to 194° C. at a weight ratio of 95:5 to 75:25, wherein the polyamide is a pellet having a diameter of 1 mm to 5 mm,
wherein the poly(alkylene carbonate) is polyethylene carbonate, and
wherein the polyamide has relative viscosity of 3.5 to 5 as measured according to ISO 307 and calculated by the Huggins method after dissolving polyamide in 96% (m/m) of sulfuric acid at a concentration of 1% (m/v).

### Claim 6 (depends on 1)

A molded article which is molded from the composition of claim 1.

### Claim 7 (depends on 1)

A method of preparing a molded article, the method comprising the step of molding the composition of claim 1.

### Claim 8 (depends on 7)

The method of claim 7, wherein the molding step includes the step of molding the composition into a film by extrusion.