Biomass-resource-derived polyester and production process thereof

Patent metadata

Field	Value
Publication number	US-11732087-B2
Application number	US-202217841898-A
Country	US
Kind code	B2
Filing date	Jun 16, 2022
Priority date	Apr 22, 2005
Publication date	Aug 22, 2023
Grant date	Aug 22, 2023

Abstract

The present invention provides a resin capable of contributing greatly to solve environmental problems and problems related to exhaustion of fossil fuel resources and having physical properties suited for practical use.The polyester according to the present invention has a diol and a dicarboxylic acid as constituent components and has an amount of terminal acid of 50 equivalents/metric ton or less.

First claim

The invention claimed is:

1. A biomass-resource-derived polyester, comprising as a main repeating unit thereof a dicarboxylic acid unit and a diol unit, wherein at least one of the dicarboxylic acid and diol used as raw materials of the polyester is obtained from biomass resources, a nitrogen atom content in the polyester except nitrogen atoms contained in covalently bonded functional groups in the molecule of the polyester is 0.01 ppm to 50 ppm, and wherein a metal amount of a polymerization catalyst selected from the group consisting of titanium, zirconium, tin, antimony, cerium, germanium, zinc, cobalt, manganese, iron, aluminum, magnesium, calcium, strontium, sodium and potassium in the polyester, is 5 ppm to 130 ppm.

2. The biomass-resource-derived polyester according to claim 1 , wherein an amount of terminal acid in the polyester is 50 equivalents/metric ton or less.

3. The biomass-resource-derived polyester according to claim 1 , wherein a sulfur atom content in the polyester is, in terms of a mass ratio, 0.0001 ppm to 50 ppm relative to the polyester.

4. The biomass-resource-derived polyester according to claim 1 , wherein the polyester has a water content, in terms of a mass ratio, of 1 ppm to 3000 ppm relative to the polyester.

5. The biomass-resource-derived polyester according to claim 1 , wherein the reduced viscosity (ηsp/c) of the polyester is 1.0 or greater.

6. The biomass-resource-derived polyester according to claim 1 , wherein the polyester has a YI value of −10 to 30.

7. The biomass-resource-derived polyester according to claim 1 , which comprises at least one tri- or higher functional compound unit selected from the group consisting of tri- or higher functional polyhydric alcohols, tri- or higher functional polycarboxylic acids, and tri- or higher functional oxycarboxylic acids.

8. The biomass-resource-derived polyester according to claim 7 , wherein the content of the tri- or higher functional compound unit is 0.0001 mole % to 0.5 mole % based on 100 mole % of all the monomer units constituting the polyester.

9. The biomass-resource-derived polyester according to claim 1 , wherein the dicarboxylic acid unit constituting the main repeating unit of the polyester is a biomass-resource-derived succinic acid unit.

10. A biomass-resource-derived polyester resin composition, which comprises 99.9 to 0.1 wt. % of a polyester according to claim 1 and 0.1 to 99.9 wt. % of a thermoplastic resin, biodegradable resin, natural resin or polysaccharide.

11. A molded product obtained by molding a biomass-resource-derived polyester according to claim 1 .

12. The molded product according to claim 11 , which is a film, a sheet, an injection molded product, or a foam molded product.

13. A pellet obtained from a biomass-resource-derived polyester according to claim 1 .

Assignees

• Mitsubishi Chem Corp

Inventors

• Aoshima Takayuki
• Miki Yasuaki
• Kumazawa Katsuhisa
• Katou Satoshi
• Uyeda Tadashi
• Hoshino Toyomasa
• Shintani Noboru
• Yamagishi Kenji
• Isotani Atsushi

Classifications

• C08G63/16 Primary

  Dicarboxylic acids and dihydroxy compounds · CPC title

• C08G63/20

  Polyesters having been prepared in the presence of compounds having one reactive group or more than two reactive groups · CPC title

• C08G63/78

  Preparation processes · CPC title

• C08L67/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence) · CPC title

• C08L1/00

  Compositions of cellulose, modified cellulose or cellulose derivatives · CPC title