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Process for production of polyamide resin pellets for the production of films and polyamide resin films produced by using the same

A technology of polyamide resin and manufacturing method, applied in the field of polyamide resin film, can solve problems such as hindering productivity, and achieve the effects of improving productivity, less fish eyes, and high industrial value

Inactive Publication Date: 2008-12-17
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, under conventional molding conditions corresponding to high-flow extrusion, the extruder barrel temperature exceeds 250°C during film molding. The current situation is that fish eyes cannot be said to be sufficiently suppressed under such conditions, which hinders productivity improvement

Method used

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  • Process for production of polyamide resin pellets for the production of films and polyamide resin films produced by using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 25 kg of caprolactam manufactured by Mitsubishi Chemical Corporation, 0.75 kg of water, and 1.74 g of disodium hydrogenphosphite pentahydrate were added to the container, and the gas atmosphere was replaced with a nitrogen atmosphere, followed by dissolution at 100°C. This raw material aqueous solution was transferred to the autoclave, and the jacket temperature was set to 280° C., and heating was started. The temperature of the contents was raised to 270°C, and then the pressure of the autoclave was slowly released, and then the pressure was further reduced until the set stirring power was reached, and the polycondensation reaction was terminated. After the reaction is terminated, the pressure is restored with nitrogen gas, and the content is introduced into the cooling water tank in the form of strands with a diameter of 2 mm, and then granulated to a length of 2-3 mm with a rotary cutter. The obtained granules and boiling water (1.5 times the amount of the granules) ...

Embodiment 2

[0062] 400 g of a polyamide resin (with a fine powder content of 23 weight ppm) having a relative viscosity of 4.50 and 800 g of a polyamide resin having a relative viscosity of 4.50 from which fine powder has been removed were dry mixed to obtain a polyamide resin sample for evaluation, in the same manner as in Example 1. various evaluation methods. The evaluation results are shown in Table 1.

Embodiment 3

[0064] Various evaluations were carried out in the same manner as in Example 1, except that 200 g of a polyamide resin (with a fine powder content of 23 wt. Formula mixed, as a polyamide resin sample for evaluation, in the same manner as in Example 1, various evaluations were performed. The evaluation results are shown in Table 1.

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Abstract

A process for the production of polyamide resin pellets for the production of films, characterized by extruding a polyamide resin obtained by melt polycondensation into strands, cooling and solidifying the strands, cutting them with a rotary cutter into pellets, and separating fines from the pellets to lower the fines content of the pellets to 20ppm by weight or below. The polyamide resin of the invention can give polyamide resin films which are suppressed in the occurrence of fishing eyes and thereby improved in surface appearance without adding a compound and without impairing the heat resistance, slipperiness, or transparency and which have higher commercial value. The polyamide resin is expected to bring about higher productivity in producing films by a recent molding process involving a high flow rate, a high extruder rate, and an extruder cylinder temperature exceeding 250 DEG C, thus having great industrial value.

Description

technical field [0001] The present invention relates to a method for producing polyamide resin pellets for films and a polyamide resin film using the pellets. Specifically, the present invention relates to a method for producing polyamide resin pellets for films with a low fine powder content, and provides a polyamide resin film with few fish eyes and good surface appearance. Background technique [0002] Compared with polypropylene film, polyester film, etc., polyamide resin film is characterized by good mechanical properties, heat resistance, transparency, and gas barrier properties. Therefore, it is used as a packaging film for food, pharmaceuticals, department stores, etc. ,Wide range of applications. [0003] Among these features, appearance is extremely important from the viewpoint of commodity value, and grainy defects called "fish eyes" can be cited as factors that spoil the appearance. [0004] In order to suppress the occurrence of fish eyes in a polyamide resin ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B9/06B29B13/10
CPCB29B9/06B29B9/16B29K2077/00
Inventor 宫本正昭滨野俊之人见达也西田裕一
Owner MITSUBISHI CHEM CORP
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