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Foam sheet of thermoplastic resin composition and process for producing the same

A thermoplastic resin and resin composition technology, applied in transportation and packaging, thin material processing, mirrors, etc., can solve the problems of micronized light reflectivity of bubbles that are not recorded and taught, and cannot obtain sufficient light reflection characteristics, etc., to achieve excellent softness sexual effect

Inactive Publication Date: 2009-08-26
ASAHI KASEI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This has the problem that sufficient light reflection characteristics cannot be obtained due to fibrillation at the time of sheet production
[0013] In addition, there is no record and teaching in any of the prior art documents as the technology of the present application, the ratio of PTFE in thermoplastic resin composition foam and Technology that significantly affects the miniaturization of bubbles in the dispersed state, especially the light reflectivity

Method used

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  • Foam sheet of thermoplastic resin composition and process for producing the same
  • Foam sheet of thermoplastic resin composition and process for producing the same
  • Foam sheet of thermoplastic resin composition and process for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0170] Raw materials: A1, B1, C1, C2, C3

[0171] Dispersion method: Dispersion method※1

[0172] Extruder: ZSK-25 twin-screw extruder

[0173] Screw speed: 300rpm, output: 12kg / hour, resin temperature at die outlet: 290°C

[0174] Under the above conditions, the raw materials of the formula shown in Table 1 were extruded to obtain a PTT composition with a melting point of 225°C.

[0175] The aforementioned PTT composition was supplied to a 90mmφ single-screw extruder set at 235°C, melted, and then extruded from a T-die with a width of 1000mm and an interval of 0.6mm as a die at a linear speed of 10m / min. It is sheet-like. The flow path from the extruder to the die is heated to the same temperature as the extruder.

[0176] At this time, 0.1% by weight of nitrogen gas relative to the composition was injected from the center of the extruder, and mixed with the melt and dissolved. In addition, the pressure of the melt at the entrance of the T-die was 15 MPa. The melt extru...

Embodiment 2～4

[0187] Except having changed the compounding quantity of a raw material as shown in following Table 1, it carried out similarly to the said Example 1, and obtained the PTT composition foamed sheet and molded article. The results are shown in Table 1 below. In Examples 2, 3, and 4, sheets having particularly fine cells were obtained. In addition, the value of the apparent density shows that the foamed sheet has light weight and excellent surface appearance. However, some fuzzing was generated on the surface of the sheet in Example 4.

Embodiment 5～7

[0189] Except having changed the amount of nitrogen gas as shown in the following Table 1, it carried out similarly to the said Example 3, and obtained the PTT composition foamed sheet and molded article. The results are shown in Table 1 below. In Examples 5 and 6, sheets having fine cells were obtained. In addition, the value of the apparent density shows that the foamed sheet has light weight and excellent surface appearance. However, some fuzzing was generated on the surface of the sheet in Example 7.

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Abstract

The invention provides a thermoplastic-resin-composition foam sheet which is excellent in surface appearance and lightweight, PTT, and light-reflecting properties, and a process for producing the sheet. The foam sheet is made of a thermoplastic resin composition comprising 80-99.5 wt.% thermoplastic resin (A) and 0.5-20 wt.% PTFE (polytetrafluoroethylene) (B). When an inner part of the foam sheet is examined with an SEM (scanning electron microscope) for dispersed particles of the PTFE (B) and the number of PTFE particles in the range of 0.05-1 [mu]m, the number of PTFE particles in the range of 1-30 [mu]m, and the number of PTFE particles in the range of 30 [mu]m and larger are expressed by (L), (M), and (N), respectively, then (L) / (M) is from 99.99 / 0.01 to 50 / 50 and (M)>(N). The average cell diameter of the foam sheet as measured in the direction perpendicular to the direction of hauling for the foam sheet is 0.1-50 [mu]m.

Description

technical field [0001] The present invention relates to a foamed sheet and its manufacturing method. Specifically, the present invention relates to a foamed sheet in which PTFE (polytetrafluoroethylene) is dispersed in a thermoplastic resin with a specific particle size and a method for producing the same. Background technique [0002] Foams made of thermoplastic resins are widely used in heat insulating materials, impact absorbing materials, food containers, etc. due to their light weight, heat insulating properties, and mechanical properties. In particular, extruded products such as films and sheets have excellent mechanical properties and light reflection properties, and are expected to be suitable for various applications such as food and daily necessities packaging containers, packaging materials, building materials, and light reflection plates. [0003] In these applications, in order to obtain light weight, flexibility, heat insulation, and light reflection functions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12B29C47/00G02B5/08B29K105/04B29C48/40
CPCC08J2300/22C08J2469/00B29C47/0004C08J2425/00C08J2423/00B29C47/0021C08J2467/00C08J2433/00B29K2027/18B29C47/40C08J9/0061C08J2201/03B29K2105/046B29C44/3469C08J2427/18B29K2105/04C08J9/122B29C48/022B29C48/08B29C48/40Y10T428/249979
Inventor 前川知文藤本克宏
Owner ASAHI KASEI CHEM CORP
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