Method for manufacturing fibrous particles of polylactic acid resin, colloid composition for forming foam sheet, foam sheet, and method for manufacturing foam sheet

Patent metadata

Field	Value
Publication number	US-2016222183-A1
Application number	US-201414913995-A
Country	US
Kind code	A1
Filing date	Aug 29, 2014
Priority date	Aug 29, 2013
Publication date	Aug 4, 2016
Grant date	—

Abstract

The present invention relates to a colloid composition for forming a foam sheet including: polylactic acid resin particles having an average diameter of 1 μm to 100 μm obtained by pulverizing fibrous particles of a polylactic acid resin.

First claim

1 . A colloid composition for forming a foam sheet comprising:
polylactic acid resin particles having an average diameter of 1 μm to 100 μm obtained by pulverizing fibrous particles of a polylactic acid resin.

2 . The colloid composition for forming a foam sheet of claim 1 , wherein an aspect ratio of the fibrous particles of the polylactic acid resin is 20 to 100.

3 . The colloid composition for forming a foam sheet of claim 1 , wherein an average diameter of a longitudinal section of the fibrous particles of the polylactic acid resin is 10 μm to 300 μm.

4 . A foam sheet comprising a polylactic acid foam layer formed by foaming the colloid composition for forming a foam sheet of claim 1 .

5 . The foam sheet of claim 4 , wherein the polylactic acid resin particles include the polylactic acid resin having a weight average molecular weight of 100,000 to 200,000.

6 . A method for manufacturing a foam sheet including a polylactic acid foam layer, comprising:
introducing a polylactic acid resin and forming a molten polylactic acid spray solution; spraying the molten polylactic acid spray solution by a melt-spraying method and simultaneously cooling the molten polylactic acid spray solution to obtain fibrous particles of the polylactic acid resin in which a diameter of a longitudinal section is 10 μm to 300 μm; pulverizing the fibrous resin particles of the polylactic acid resin to be polylactic acid resin particles having an average diameter of 1 μm to 100 μm; preparing a foaming resin composition as a colloid composition by mixing the pulverized polylactic acid resin particles with a solvent, and forming a layer by applying the foaming resin composing; and forming a polylactic acid foaming layer by foaming the layer formed from the foaming resin composition.

7 . The method of claim 6 , wherein the polylactic acid resin is introduced into an extruder, transferred to a spray nozzle, and heated in the spray nozzle to form the molten polylactic acid spray solution.

8 . The method of claim 7 , wherein the polylactic acid resin in a pellet form or in a powder form is introduced into the extruder.

9 . The method of claim 8 , wherein the molten polylactic acid spray solution is introduced into the spray nozzle together with air and then discharged.

10 . The method of claim 9 , wherein the air that is injected into the spray nozzle has a temperature of 300° C. to 500° C., a pressure of 100 psi to 1000 psi, and an injection speed of 10 m/s to 50 m/s.

11 . The method of claim 6 , wherein the spray nozzle has a temperature of 200° C. to 400° C.

12 . The method of claim 6 , wherein the spray nozzle has a pressure of 10 psi to 1000 psi.

13 . The method of claim 6 , wherein the spray nozzle has a diameter of 0.5 mm to 3.0 mm.

14 . The method of claim 6 , wherein the molten polylactic acid spray solution has a viscosity of 1500 cp to 3000 cp at 250° C.

15 . The method of claim 6 , wherein the molten polylactic acid spray solution does not include a plasticizer.

16 . The method of claim 6 , wherein a melt electrostatic spray deposition (melt ESD) is performed by applying voltage of 10,000 V to 50,000 V to the spray nozzle.

17 . The method of claim 6 , wherein an aspect ratio of the fibrous particles of the polylactic acid resin is 20 to 100.

18 . The method of claim 6 , wherein a diameter of a longitudinal section of the fibrous particles of the polylactic acid resin is 10 μm to 300 μm.

19 . (canceled)

20 . (canceled)

Assignees

• Lg Hausys Ltd

Inventors

• Shin Jun-Beom
• Kang Sung-Yong
• Lee Min-Hee
• Kwon Hea-Won
• Kang Kyoung-Min

Classifications

• D01D5/0985

  by means of a flowing gas (e.g. melt-blowing) · CPC title

• D01D5/0069

  characterised by the spinning section, e.g. capillary tube, protrusion or pin · CPC title

• D01D5/0023

  the material being a polymer melt · CPC title

• C08L67/04

  Polyesters derived from hydroxycarboxylic acids, e.g. lactones (C08L67/06 takes precedence) · CPC title

• C08J2367/00

  Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers · CPC title