Poly(alkylene carbonate) resin composition, preparation method thereof, molded article formed therefrom, and preparation method of molded article using the same

Patent metadata

Field	Value
Publication number	US-10865274-B2
Application number	US-201716067802-A
Country	US
Kind code	B2
Filing date	May 31, 2017
Priority date	May 31, 2016
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

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.

First claim

The invention claimed is:

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).

2. 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).

3. 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.

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

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).

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

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

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

Assignees

• Lg Chemical Ltd

Inventors

• Kim Sung-Kyoung
• Kim Hyun Min
• Cho Hyun Ju
• Park Seung Young

Classifications

• C08L77/00

  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 · CPC title

• C08L69/00 Primary

  Compositions of polycarbonates; Compositions of derivatives of polycarbonates · CPC title

• C08J3/11

  from solid polymers · CPC title

• C08G64/32 Primary

  using carbon dioxide · CPC title

• C08G64/0208 Primary

  saturated · CPC title