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Process for producing extruded foam of polyhydroxyalkanoate resin and extruded foam obtained by the process

A technology of extrusion foaming and hydroxycaproic acid ester, which is applied in the field of extrusion foams, can solve the problems of foams with no disclosed expansion ratio, and achieve excellent water resistance

Inactive Publication Date: 2008-05-21
KANEKA CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is sometimes difficult to continuously prepare polyhydroxyalkanoate resin foams for a long period of time using the preparation method disclosed in Patent Document 11.
[0007] In addition, Patent Document 11 does not disclose a foam having an expansion ratio of more than 8 times.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] Alcaligenes eutrophus (Alcaligenes eutrophus) AC32 (J.Bacteriol., 179, 4821 (1997) into which PHA synthetase gene derived from Aeromonas caviae was introduced into Alcaligenes eutrophus was used ) as microorganisms, suitably regulate raw material, culture condition, produce PHBH (10mol% of HH rate, Mw=530,000).By 100 weight parts PHBH and 3 weight parts as the lauric acid amide of fatty acid amides compound, in the uniaxial of φ 35mm In the extrusion molding machine, after melting and kneading at the barrel temperature of 135°C, it is extruded from a 3mmφ small hole die installed at the front end of the extruder, and the extruded strands are passed through a granulator, cut off, and the weight of the pellets is 5mg. PHBH particles (Mw=450,000, Tg=1°C, Tm=135°C, Tc=68°C). The particles are supplied to two-stage extruders connected in series with a diameter of 65 mm and a diameter of 90 mm at a rate of about 40 kg / hr. Out of the machine. The resin mixture supplied to the ...

Embodiment 2

[0092] Except that palmitic acid amide is used as the fatty acid amide compound, and the resin temperature To during foaming is 79°C (To is between Tg and Tm, satisfying the relationship of formula (2)), follow the same method as in Example 1 to obtain A plate-shaped extruded foam with a thickness of about 10 mm and a width of about 80 mm. The expansion ratio of the obtained foam was 19 times, and the open cell ratio was 99%. In addition, the state of the extruder during operation is stable. In addition, the biodegradability of the obtained foam was good. The results are shown in Table 1.

Embodiment 3

[0094] In addition to using stearic acid amide as the fatty acid amide compound, the resin temperature To during foaming is 78 ° C (To is between Tg and Tm, satisfying the relationship of formula (2)), according to the same method as in Example 1, A sheet-like extruded foam having a thickness of about 10 mm and a width of about 80 mm was obtained. The expansion ratio of the obtained foam was 20 times, and the open cell ratio was 98%. In addition, the state of the extruder during operation is stable. In addition, the biodegradability of the obtained foam was good. The results are shown in Table 1.

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Abstract

An extruded foam excelling in environmental friendliness and having biodegradability; and a stable process for producing the same. There is provided a process for producing an extruded foam of P3HA resin, characterized by melt kneading a copolymer (poly(3-hydroxyalkanoate), P3HA) having at least one type of repeating unit of the formula: -O-CHR-CH2-CO- (1) (wherein R is an alkyl of the formula CnH2n+1 in which n is an integer of 1 to 15) produced by a microbe, a volatile foaming agent, a fatty acid amide compound and / or petrolatum to thereby obtain a mixture and extruding the mixture through molding die into a low-pressure zone.

Description

technical field [0001] The present invention relates to a preparation method of a plant-derived polyhydroxyalkanoate resin extruded foam with biodegradability and an extruded foam obtained by the preparation method. Background technique [0002] Recently, environmental problems caused by discarded plastics have not ceased, so among them, biodegradable plastics, which are decomposed into water and carbon dioxide by the action of microorganisms after being discarded, have attracted attention. Generally, biodegradable plastics can be roughly divided into the following three categories: (1) aliphatic polyesters produced by microorganisms such as polyhydroxyalkanoates (especially poly(3-hydroxyalkanoates)); (2) chemically synthesized aliphatic polyesters such as polylactic acid or polycaprolactone; (3) natural polymers such as starch or cellulose acetate. Most of chemically synthesized aliphatic polyesters are not easily decomposed in water because they do not decompose anaerobi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/00C08J9/12C08L101/16B29K67/00B29K105/04B29C48/04B29C48/07B29C48/395B29C48/92
CPCB29C47/0011C08J2367/04B29C2947/92609B29C47/38B29C47/92B29C2947/92514B29K2995/0017B29K2995/006B29K2105/045B29C2947/92695C08J2201/03B29C2947/92704B29C47/0019B29C2947/922C08J9/142B29C47/402B29C2947/9218B29C2947/92209B29C2947/92619B29C2947/92161B29C47/0004B29C48/92B29C2948/92209B29C2948/92704B29C48/022B29C48/04B29C48/07B29C48/395B29C48/402B29C2948/92161B29C2948/9218B29C2948/922B29C2948/92514B29C2948/92609B29C2948/92619B29C2948/92695
Inventor 广瀬文信千田健一宫川登志夫
Owner KANEKA CORP
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