Foamed polyhydroxyalkanoate resin particles and method of producing the foamed particles

A technology of hydroxyalkanoate and foamed particles, which is applied in the field of polyhydroxyalkanoate resin foamed particles and the preparation of the foamed particles, which can solve the problems of molecular weight reduction, inability to anaerobic degradation, limited degradation conditions, etc. question

Inactive Publication Date: 2008-03-19
KANEKA CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most chemically synthesized aliphatic polyesters cannot be degraded anaerobically, and the degradation conditions are limited when they are discarded. Polylactic acid and polycaprolactone have problems in heat resistance.
In addition, starch has the problem of being non-thermoplastic, brittle, poor water resistance, etc.
In addition, on the other hand, when using the conventional preparation method, since water is used as the dispersion medium in the pressure vessel, the water in the vessel becomes acidic or alkaline hot water due to the type of ingredients, etc. As a result, PHBH decomposes, and the molecular weight may lowered, so care must be taken to manufacture

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The preparation method of the P3HA resin expanded particles of the present invention is as follows. The P3HA resin expanded particles of the present invention are used. First, the P3HA resin as the base resin is heated, melted and kneaded with an extruder, a kneader, a Banbury mixer, a roller, etc., and then formed into a cylindrical shape or an elliptical column shape. P3HA resin particles obtained in particle shapes such as , spherical, cubic, and rectangular parallelepiped that are easily used in the method for producing expanded particles of the present invention. The weight per particle is preferably 0.1 mg or more, more preferably 0.5 mg or more. In addition, although the upper limit is not particularly limited, it is preferably 10 mg or less. When it is less than 0.1 mg, it may be difficult to manufacture the P3HA resin particles themselves.

[0022] The P3HA resin particles obtained in this way are introduced into an airtight container together with a blowing ...

Embodiment 1

[0049]Alcaligenes eutrophus AC32 (Accession No. FERM BP-6038 (by Heisei) obtained by introducing the PHA synthase gene derived from Aeromonas caviae into Alcaligenes eutrophus Transfer of the original deposit (FERM P-15786) deposited on August 12, 2008) (August 7, 2019, Patent Organism Depository Center of the National Institute of Advanced Industrial Technology, an independent administrative corporation, address: Tsukuba, Ibaraki Prefecture, Japan No. 1, No. 1, East 1st Street, No. 1 Central No. 6)) (J.Bacteriol., 179, 4821 (1997)) as microorganisms, the PHBH (PHBH (Mw=530,000 of Mw=530,000 of Mw=530,000 of HH rate 10 mol %) produced by adjusting raw materials and culture conditions appropriately )), the PHBH was melted and kneaded at a cylinder temperature of 135°C with a φ35mm uniaxial extrusion molding machine (Kasamatsu Kawasaki Experimental Universal Extruder) with a kneader. Extrude monofilaments from the small orifice die head, cut the monofilaments with a granulator t...

Embodiment 2

[0057] Alcaligenes eutrophus (Alcaligenes eutrophus) AC32 (Accession No. FERM BP-6038 (by Heisei) obtained by introducing the PHA synthase gene derived from Aeromonas caviae (Alcaligenes eutrophus) into Alcaligenes eutrophus Transfer of the original deposit (FERM P-15786) deposited on August 12, 2008) (August 7, 2010, Patent Organisms Deposit Center of the National Institute of Advanced Industrial Technology, an independent administrative corporation, address: Tsukuba (つくば), Ibaraki Prefecture, Japan No. 1-1, No. 1 East Street, Central No. 6)) (J.Bacteriol., 179,4821 (1997)) as microorganisms, the PHBH (PHBH (Mw=72 of Mw=72 of HH rate 7 mol %) of proper adjustment raw material, culture condition production 10,000)), the obtained PHBH was melted and kneaded at a cylinder temperature of 145°C with a φ35mm single-screw extrusion molding machine (Kasamatsu Kawasaki Experimental Universal Extruder) with a kneader, and was installed at the front end of the extruder The small orifice...

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PUM

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Abstract

It is intended to provide an easy-to-use, energy-saving and economical method of producing foamed resin particles having a high environmental compatibility by using an ether, which generates neither sulfur oxide nor sot in the course of disposal and incineration and enables considerable reduction in nitrogen oxide formation, and further using a resin which originates in a plant and contributes to the carbon dioxide fixation. Namely, a method of producing foamed P3HA resin particles comprising the step of feeding particles of a resin containing a copolymer, which is produced by a microorganism and has a repeating unit represented by the general formula (1) [-CHR-CH2-CO-O-] (wherein R represents an alkyl group represented by CnH2n+1 and n is an integer of from 1 to 15), and a foaming agent into an airtight container, and the step of heating the mixture until the resin particles become softening, then releasing one end of the airtight container and discharging the resin particles into an atmosphere with a pressure lower than the pressure in the airtight container to thereby foam the resin particles and give foamed particles. In this method of producing foamed P3HA resin particles, the foaming agent is at least one member selected from the group consisting of dimethyl ether, diethyl ether and methyl ethyl ether.

Description

technical field [0001] The invention relates to a plant-derived, biodegradable polyhydroxyalkanoate resin expanded particle and a method for preparing the expanded particle which saves energy. Background technique [0002] Recently, environmental problems caused by waste plastics have become increasingly urgent, and among them, biodegradable plastics, which are decomposed into water and carbon dioxide by the action of microorganisms after use, have received intense attention. Generally, biodegradable plastics are broadly classified into 3 categories: 1) microorganisms such as polyhydroxyalkanoate (in the present invention, especially poly(3-hydroxyalkanoate) or P3HA) produce aliphatic polyester-like , 2) chemically synthesized aliphatic polyesters such as polylactic acid or polycaprolactone, 3) natural polymers such as starch or cellulose acetate. Most chemically synthesized aliphatic polyesters cannot be degraded anaerobically, and the degradation conditions are limited wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/18C08L101/16
CPCC08J2367/04C08J9/18C08J2203/12
Inventor 广瀬文信宫川登志夫千田健一
Owner KANEKA CORP
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