Process for production of molded polyester resin article, crystallization inducer for use in the process, master batch, and molded polyester resin article

A technology of polyester resin and production method, which is applied in the production of polyester resin plastic parts, masterbatch and polyester resin plastic parts, crystallization initiator field, can solve the problems such as the decrease of transparency of polylactic acid plastic parts, and achieve excellent compatibility , Excellent heat resistance

Active Publication Date: 2010-10-06
DAINICHISEIKA COLOR & CHEM MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since these nucleating agents are inorganic materials, this method has another drawback: the transparency of the obtained PLA plastic parts is reduced

Method used

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  • Process for production of molded polyester resin article, crystallization inducer for use in the process, master batch, and molded polyester resin article
  • Process for production of molded polyester resin article, crystallization inducer for use in the process, master batch, and molded polyester resin article
  • Process for production of molded polyester resin article, crystallization inducer for use in the process, master batch, and molded polyester resin article

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0093] The kneaders usable in the preparation step of resin A, the preparation step of masterbatch M and the preparation of various mixtures in the present invention may include extruders such as single-screw extruders, twin-screw extruders, and multi-screw extruders. extruder, three-roll mill, two-roll mill, pressure kneader, Banbury mixer, open twin-screw continuous kneader, and the like, particularly preferably an extruder. In the molding step of plastic part D or E, screw extruders such as single-screw extruders, co-rotating or counter-rotating twin-screw extruders, and multi-screw extruders can be used; injection molding machines ; rotary kneaders; single-screw or multi-screw continuous kneaders; and the like.

[0094] These kneaders, molding machines and molding machines can be used alone or in combination by usual resin kneading or resin molding or molding methods. In these kneading machines, various parts such as a screw, a kneading disk, and a rotor can be selectivel...

Embodiment 1

[0104] (1) Preparation of resin A-1 (crystallization initiator)

[0105] To powder (100 g) of poly(L-lactic acid) (resin A', hereinafter referred to as "polylactic acid") was added t-butylperoxyisopropyl carbonate (purity: 95%; 0.4 g, 0.0022 mol). After thorough mixing, the resulting mixture was kneaded in a 25-mm twin-screw extruder (L / D: 42, kneading temperature: 200° C.), put into water in the form of strands and cooled therein, and then pelletized by Machine cut to prepare pellets of Resin A-1.

[0106] The differential scanning calorimetry measurement of the pellets of resin A-1 obtained as described above was carried out twice in succession. figure 1 A particle diagram of resin A-1 is shown. In the first measurement, a steep endothermic curve representing melting of the particles of resin A-1 with a peak at 169°C appeared upon heating, and a steep endothermic curve representing crystallization of the particles of resin A-1 appeared at 125°C upon cooling. exothermic p...

Embodiment 2-4

[0114] In a similar manner to Example 1(3), an aliquot of pellets of masterbatch M-1 and an aliquot of pellets of polylactic acid (resin C) were mixed as shown in Table 4, respectively. The resulting mixture was molded by an injection molding machine alone to obtain molded plates D-2 to D-4 of polylactic acid. Differential scanning calorimetry and X-ray diffraction were performed on the molded plate thus obtained. Table 4 shows the exothermic peak temperature upon cooling and the peak angle 2θ in the X-ray diffraction pattern.

[0115] Table 4

[0116]

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Abstract

Disclosed is a process for producing a crystallized molded polyester resin article, which is characterized by melt-injecting any one mixture (compound) selected from the following mixtures (a) and (b) in a mold, retaining the mixture in the mold, and cooling the mixture to thereby crystallize a polyester resin constituting the molded article without using any inorganic nucleating agent: (a) a mixture of a crystallization-inducible crosslinked polyester resin (A) having a crosslinked point formed at at least a part therein by using a crosslink-forming agent and a non-crosslinked polyester resin (C); and (b) a mixture of: a mixture (a crystallization-inducible master batch (M)) of the resin (A) and a non-crosslinked polyester resin (B) which contains the resin (A) in a larger quantity; and a non-crosslinked polyester resin (C). It becomes possible to provide a process for producing a crystallized molded polyester resin article which cannot be deteriorated in its transparency because anyinorganic nucleating agent (a substance which can cause white turbidity in the molded article) is not used.

Description

technical field [0001] The invention relates to a production method of a polyester resin plastic part, a crystallization initiator used in the method, a masterbatch and a polyester resin plastic part. More specifically, the present invention relates to a method for producing polyester resin moldings with improved physical properties, the method comprising using a masterbatch containing a crystallization-initiated polyester resin in which crosslinking points are formed as a crystallization Initiators to provide moldings of polyester resins as raw materials (particularly aliphatic polyester resins, generally polyester resins with improved physical properties consisting of plant-derived raw materials as the main component), and A crystal forming condition is maintained for the polyester resin in the molding stage to crystallize the polyester resin to obtain a polyester resin molding. The invention also relates to a crystallization initiator, a masterbatch and a polyester resin m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/00B29C45/00C08J3/24B29K67/00
CPCC08J2367/04C08L2205/22C08J3/226C08J2467/00C08L67/04B29C45/0001C08L2666/18
Inventor 芝田正之矢内佑一今井贵宏上野浩道今野义纪伊藤淳一长内隆明中村道卫
Owner DAINICHISEIKA COLOR & CHEM MFG CO LTD
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