Method for preparing resin composition for expandable polypropylene carbonate and expandable polypropylene carbonate prepared therefrom

Patent metadata

Field	Value
Publication number	US-9315665-B2
Application number	US-201213728701-A
Country	US
Kind code	B2
Filing date	Dec 27, 2012
Priority date	Dec 30, 2011
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

Provided herein are a method for preparing a resin composition for an expandable polypropylene carbonate and an expandable polypropylene carbonate prepared therefrom. More particularly, the present invention relates to a method for preparing a resin composition for an expandable polypropylene carbonate capable of using supercritical carbon dioxide as a foaming agent and preparing a foam having excellent moldability by an appropriate foaming method, and an expandable polypropylene carbonate prepared therefrom. The expandable polypropylene carbonate capable of having high magnification, excellent thermal stability, and dimensional stability may be prepared by using the resin composition according to the present invention.

First claim

What is claimed is:

1. A method for preparing a resin composition for an expandable polypropylene carbonate, the method comprising:
1) providing components consisting of polypropylene carbonate resin (a1), a thermoplastic resin (a2), a compatibilizer (B), a cross-linking agent, a chain extender, or a mixture thereof (C), an inorganic material (D), and a heat stabilizer (E);
2) cross-linking the polypropylene carbonate resin (a1), the thermoplastic resin (a2), and the cross-linking agent, the chain extender, or the mixture thereof (C) provided in step 1); and
3) mixing the obtained material in step 1), step 2) and the compatibilizer (B), the inorganic material (D), and the heat stabilizer (E) provided in step 1) with one another,
wherein the compatibilizer (B) compatibilizes between the polypropylene carbonate resin (a1) and the thermoplastic resin (a2).

2. The method of claim 1 , wherein the cross-linking step (step 2) is a step of kneading the polypropylene carbonate resin (a1) and the thermoplastic resin (a2) to cross-link them or a step of cross-linking each of the polypropylene carbonate resin (a1) and the thermoplastic resin (a2) to mix them.

3. The method of claim 1 , wherein the cross-linking step (step 2) includes cross-linking the polypropylene carbonate resin (a1) alone and then secondarily cross-linking the cross-linked polypropylene carbonate resin with the thermoplastic resin (a2).

4. The method of claim 1 , further comprising:
cross-linking 100 parts by weight of a base resin (A) consisting of 10 to 90 wt. % of the polypropylene carbonate resin (a1) and 10 to 90 wt. % of the thermoplastic resin (a2), 0.1 to 20 parts by weight of the compatibilizer (B), and 0.01 to 10 parts by weight of the cross-linking agent, the chain extender, or the mixture thereof (C) in step 2); and
mixing 0.1 to 10 parts by weight of the inorganic material (D), and 0.01 to 1 part by weight of the heat stabilizer (E) with the material obtained in step 2.

5. The method of claim 4 , wherein the polypropylene carbonate resin (a1) has a weight average molecular weight of 10,000 to 1,000,000.

6. The method of claim 4 , wherein the thermoplastic resin (a2) is one or a mixture of two or more selected from the group consisting of polyethylene terephthalate glycol (PETG), polylactic acid, polyvinylacetate, polycaprolactone, polymethylmethacrylate, polyethylene-vinylacetate copolymer (EVA), polyethylenemethacrylate glycidylmethacrylate copolymer, polyethylene, polypropylene, polybutylene and copolyester having the following structure:

(Where, —[R—O] z — represents polyol selected from the group consisting of (a) polyester polyol triol having a molecular weight of 200 to 10,000, (b) polyether glycol having a molecular weight of 200 to 10,000, and (c) polyester polyol diol having a molecular weight of 10,000 or less; m represents an integer of 2 to 10, n represents an integer of 0 to 18; p represents an integer of 2 to 10, and v, w, x and y each represent an integer of 0 to 100.).

7. The method of claim 4 , wherein the compatibilizer (B) is an acryl-based copolymer having a weight average molecular weight of 5,000 to 10,000,000 g/mol.

8. The method of claim 7 , wherein the acryl-based copolymer is a polymer formed by copolymerization of at least two monomers selected from the group consisting of a linear alkyl (meth)acrylate monomer, a branched alkyl (meth)acrylate monomer, a cyclic alkyl (meth)acrylate monomer, and combinations thereof.

9. The method of claim 4 , wherein the-compatibilizer (B) is low-molecular weight polypropylene carbonate or polypropylene carbonate copolymer, which has a weight average molecular weight of 500 to 1,000,000 g/mol.

10. The method of claim 4 , wherein the cross-linking agent is one or a mixture of two or more selected from 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4′-diphenylmethane diisocyanate, m-phenylene diisocyanate, xylylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, lysine diisocyanateester, 1,4-cyclohexylene diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, 3,3′-dimethyl-4,4′-biphenylene diisocyanate, N-p-maleimidophenyl isocyanate, 1,6-hexamethylene diisocyanate, and isophorone diisocyanate.

11. The method of claim 4 , wherein the chain extender is one or a mixture of two or more selected from the group consisting of ethylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,10-decanediol, 2,2-dimethyl-1,3-propanediol, 1,3-propanediol, trimethylpropanol, bisphenol, polyester diol, polyether diol, polycaprolactonediol, and polycarbonatediol.

12. The method of claim 4 , wherein the inorganic material (D) is one or a mixture of two or mere selected from the group consisting of titanium dioxide, talc, kaolin, wollastonite, mica, and ceramic particles including one or more metals selected from the groups consisting of titanium (Ti), lead (Pb), barium (Ba), silicon (Si), tin (Sn), calcium (Ca), magnesium (Mg), aluminum (Al), niobium (Nb), zirconium (Zr), iron (Fe), tungsten (W), vanadium (V), manganese (Mn), cobalt (Co), nickel (Ni), zinc (Zn), and rare metal elements.

13. The method of claim 4 , wherein the heat stabilizer (E) is one or a mixture of two or more selected from the group consisting of phenol-based, hydroquinone-based, benzyl alcohol-based, quinone-based, and amine-based compounds.

14. The method of claim 13 , wherein the heat stabilizer is one or a mixture of two or more selected from the group consisting of phenothiazine, p-methoxyphenol, cresol, benzhydrol, 2-methoxy-p-hydroquinone, 2,5-di-tert-butylquinone, and diisopropylamine.

Assignees

• Sk Innovation Co Ltd
• Sk Global Chemical Co Ltd

Inventors

• Park Young Hyo
• Chung Kwang Jin
• Ok Myung Ahn
• Hong Seung Gweon
• Jeon Min Ho

Classifications

• C08J2369/00

  Characterised by the use of polycarbonates; Derivatives of polycarbonates · CPC title

• C08L67/02

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

• C08L69/00 Primary

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

• C08J2433/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title

• C08J2469/00

  Characterised by the use of polycarbonates; Derivatives of polycarbonates · CPC title