Biodegradable resin composition

• US 7,812,066 B2
• Filed: 10/11/2007
• Issued: 10/12/2010
• Est. Priority Date: 10/11/2006
• Status: Active Grant

• Current Assignee: KAO Corporation
• Original Assignee: KAO Corporation
• Inventors: Kishimoto, Hiroaki, Takenaka, Akira
• Primary Examiner(s): SANDERS, KRIELLION ANTIONETTE
• Application Number:
  US12/442,814
• Publication Number:
  US 20100063177A1
• Time in Patent Office: 1,097 Days
• Field of Search: 523/124, 524/100, 524/140, 524/148, 524/161, 524/211, 524/201, 524/398
• US Class Current: 523/124
• CPC Class Codes: C08K 2201/014 Additives containing two or more different additives of the same subgroup in C08K
• CPC Class Codes: C08K 5/10 Esters; Ether-esters
• CPC Class Codes: C08K 5/20 Carboxylic acid amides
• CPC Class Codes: C08K 5/5317 Phosphonic compounds, e.g. R—P(:O)(OR')2
• CPC Class Codes: C08L 101/16 the macromolecular compounds being biodegradable
• CPC Class Codes: C08L 2666/22 Macromolecular compounds not provided for in C08L2666/16 - C08L2666/20
• CPC Class Codes: C08L 67/04 Polyesters derived from hydroxycarboxylic acids, e.g. lactones C08L67/06 takes precedence
• CPC Class Codes: C08L 71/02 Polyalkylene oxides

Abstract

The invention relates to a biodegradable resin composition containing a biodegradable resin, a plasticizer and a crystal nucleus agent, the plasticizer being a compound containing two or more ester groups in the molecule thereof, wherein at least one alcohol component constituting the ester contains an alkylene oxide having 2 to 3 carbon atoms, added in the average amount of 0.5 to 5 moles per one hydroxyl group, and the crystal nucleus agent is a mixture of the following crystal nucleus agent (1) and crystal nucleus agent (2); the crystal nucleus agent (1) being the following crystal nucleus agent (1-1) or crystal nucleus agent (1-2): crystal nucleus agent (1-1): at least one selected from compounds having a hydroxyl group and an amide group in the molecule thereof; and crystal nucleus agent (1-2): at least one selected from hydroxy fatty acid esters; crystal nucleus agent (2): at least one selected from a metal salt of phenylphosphonic acid, a metal salt of a phosphate, a metal salt of an aromatic dialkyl sulfonate, a metal salt of rosinic acids, an aromatic carboxylic acid amide, rosinic acid amide, carbohydrazides, N-substituted ureas, salts of melamine compounds and uracils.

Claims

1. A biodegradable resin composition, comprising a polylactic acid resin, a plasticizer and a crystal nucleus agent, the plasticizer being a compound containing two or more ester groups in the molecule thereof, wherein at least one alcohol component constituting the ester contains an alkylene oxide having 2 to 3 carbon atoms, added in the average amount of 0.5 to 5 moles per 1 hydroxyl group, and the crystal nucleus agent is a mixture of the following crystal nucleus agent (1) and crystal nucleus agent (2);

the crystal nucleus agent (1) being the following crystal nucleus agent (1-1)

crystal nucleus agent (1-1);

at least one selected from the group consisting of compounds having a hydroxyl group and an amide group in the molecule thereof; and

crystal nucleus agent (2);

at least one selected from the group consisting of a metal salt of phenylphosphonic acid.

2. The biodegradable resin composition according to claim 1, wherein the ratio of the crystal nucleus agent (1) to the crystal nucleus agent (2) is crystal nucleus agent (1)/crystal nucleus agent (2) (by weight)=20/80 to 80/20.

3. The biodegradable resin composition according to claim 1 or 2, wherein the crystal nucleus agent (1) is an aliphatic amide containing a hydroxyl group.

4. The biodegradable resin composition according to claim 1 or 2, wherein the plasticizer is at least one selected from the group consisting of an ester of succinic acid or adipic acid and a polyethylene glycol monomethyl ether and an ester of acetic acid and glycerin or an ethylene oxide addition product of ethylene glycol.

5. The biodegradable resin composition according to claim 1 or 2, wherein the content of the plasticizer is 5 to 30 parts by weight, the content of the crystal nucleus agent (1) is 0.1 to 3 parts by weight and the content of the crystal nucleus agent (2) is 0.1 to 3 parts by weight.

6. The biodegradable resin composition according to claim 1 or 2, which further comprises a hydrolysis inhibitor.