Polylactide resin and preparation method thereof

Patent metadata

Field	Value
Publication number	US-9415382-B2
Application number	US-201314027700-A
Country	US
Kind code	B2
Filing date	Sep 16, 2013
Priority date	Feb 9, 2009
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

The present invention is directed to an organometallic complex and a catalyst composition capable of producing polylactide resins with improved properties at a higher conversion rate, a method of producing the organometallic complex, polylactide resins having enhanced hydrolysis resistance and heat resistance together with superior mechanical properties, a preparation process therefor, and polylactide resin compositions including the same.

First claim

The invention claimed is:

1. A process for preparing a polylactide resin, comprising forming a catalyst composition comprising a complex between a compound of Chemical Formula 2 and a compound of Chemical Formula 3 prior to an initiation of polymerization; and subjecting lactide monomers to ring opening polymerization in the presence of the catalyst composition,
wherein

wherein n is an integer of 0 to 15, p is an integer of 0 to 2, M is Sn or Zn, R 1 and R 3 are the same as or different from each other, and each of them is hydrogen, a substituted or unsubstituted C3 to C10 alkyl, a substituted or unsubstituted C3 to C10 cycloalkyl, or a substituted or unsubstituted C6 to C10 aryl, R 2 is a substituted or unsubstituted C3 to C10 alkylene, a substituted or unsubstituted C3 to C10 cycloalkylene, or a substituted or unsubstituted C6 to C10 arylene, and each of X and Y is independently an alkoxy group or a carboxyl group.

2. The process for preparing a polylactide resin according to claim 1 , wherein the MX p Y 2-p is tin(II) 2-ethylhexanoate (Sn(Oct) 2 ).

3. The process for preparing a polylactide resin according to claim 1 , wherein R l is a monovalent phenyl group substituted with a C1 to C10 alkyl group or a C3 to C10 alkyl group or cycloalkyl group, and R 2 is a divalent phenylene group substituted with a C1 to C10 alkyl group, or a C3 to C10 alkylene group or cycloalkylene group.

4. The process for preparing a polylactide resin according to claim 1 , wherein the compounds of Chemical Formula 2 and Chemical Formula 3 are added at a ratio of 0.001 to 0.1 moles with respect to 100 moles of the lactide monomers, respectively.

5. The process for preparing a polylactide resin according to claim 1 , wherein the ring opening polymerization is carried out in the presence of an initiator comprising a compound with a hydroxy group.

6. The process for preparing a polylactide resin according to claim 5 , wherein the compound with a hydroxy group has 8 or more carbon atoms.

7. The process for preparing a polylactide resin according to claim 5 , wherein the initiator is added at a ratio of 0.001 to 1 mole with respect to 100 moles of the lactide monomers.

8. The process for preparing a polylactide resin according to claim 1 , wherein the ring opening polymerization is carried out in a manner of a bulk polymerization.

9. The process for preparing a polylactide resin according to claim 1 , wherein the ring opening polymerization is carried out at a temperature of 120 to 200° C. for 0.5 to 8 hours.

Assignees

• Lg Chemical Ltd

Inventors

• Yoon Sung-Cheol
• Lee In-Su
• Kim Seong-Woo
• Park Seung-Young

Classifications

• B01J2531/42

  Tin · CPC title

• C08G63/823

  for the preparation of polylactones or polylactides · CPC title

• B01J31/122 Primary

  Metal aryl or alkyl compounds · CPC title

• Y02P20/52

  using catalysts, e.g. selective catalysts · CPC title

• B01J2531/26

  Zinc · CPC title