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Polyethylene resin composition, laminate, and medical container

A technology of polyethylene resin and composition, which is applied in the direction of medical containers, synthetic resin layered products, containers, etc., and can solve the problems of narrow flow path, lowering, uneven film thickness and width direction, etc.

Active Publication Date: 2021-04-16
TOSOH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when those who use polypropylene want to change the material to polyethylene-based resins as described above in order to improve cleanliness, resin pressure will be caused by the narrow flow path inside the mold of the molding machine designed for polypropylene. There are problems such as the problem of becoming taller, the balance of the flow rate of each part is broken, and the film thickness becomes uneven in the width direction, etc., and it may be difficult to form
When the viscosity of the polyethylene-based resin is lowered to lower the resin pressure, the melt tension is lowered, and there is a problem that the fluctuation of the air bubbles becomes larger, and the molding stability is lowered such as the occurrence of stretching resonance.

Method used

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  • Polyethylene resin composition, laminate, and medical container
  • Polyethylene resin composition, laminate, and medical container

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0187]The resin composition shown in Table 4 was shaped by a water-cooled blow molding machine, and the surface smoothness of the forming stability and the surface of the film was evaluated by a water-cooled blow molding machine. It should be noted that the thickness of the film is set to 250 μm. Then, the film obtained by the heat seal, produced a medical container filled with ultrapure water, performing high pressure vapor sterilization at 121 ° C, evaluated the appearance of the sterilized film, transparency, flexibility, moisture permeability, and cleaning. The results of the evaluation are shown in Table 4.

Embodiment 2～7、 comparative example 1～10

[0189]The resin compositions for the intermediate layer were changed as shown in Tables 4 and 5, except that three-layer film and medical containers were produced in the same manner as in Example 1 and evaluated. The evaluation results are shown in Tables 4 and 5.

[0190]Table 1

[0191] Low-character low density polyethylene unit LL-1 LL-2 LL-3 LL-4 MFR g / 10 points 4.05.07.02.0 density Kg / M 3

910900910907 MW / MN -2.52.52.52.2

[0192]Table 2

[0193] High-density polyethylene unit HD-1 HD-2 MFR g / 10 points 5.01.0 density Kg / M 3

958952 MW / MN -2.92.8

[0194]table 3

[0195] High pressure method low density polyethylene unit LD-1 LD-2 LD-3 LD-4 LD-5 MFR g / 10 points 0.31.61.00.30.6 density Kg / M 3

920919924924922 Melt tension Mn255295135210180

[0196]Table 4

[0197]

[0198]table 5

[0199]

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Abstract

The invention provides a polyethylene-based resin composition which is excellent in terms of heat resistance, flexibility, barrier property, and cleanness (low release of fine particles), does not deform even through a sterilization treatment at 121 DEG C, retains high transparency, and has excellent processability by water-cooling inflation molding; and a medical container comprising the polyethylene-based resin composition. The polyethylene resin composition comprises 50-89 parts by weight of linear low-density polyethylene (A) having specific physical properties, 10-40 parts by weight of high-density polyethylene (B), and 1-20 parts by weight of high-pressure-process low-density polyethylene (C) (the sum of (A), (B), and (C) being 100 parts by weight) and has an MFR satisfying 3.0-9.0 g / 10 min.

Description

Technical field[0001]The present invention relates to a polyethylene resin composition and a laminated body using the polyethylene resin composition, a medical container. More specifically, the present invention relates to a resin composition excellent in extrusion characteristics and excellent forming stability at the time of water-cooled blow molding. Further, the present invention relates to a laminated body formed by forming the resin composition, and a medical container using the laminate, the laminate suitable for a filling liquid, blood, and the like a medical container such as an infusion bag.Background technique[0002]For medical containers, blood, etc., requires the following characteristics: for confirming the mixing of foreign matter, transparency of changes caused by the pharmaceutical coordination, is used to easily discharge the flexibility of the liquid, for suppressing vapor by water , Oxygen immersed into the variants such as chemical fluids caused by the container,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/04A61J1/05A61L31/04A61L31/12A61L31/14B32B27/32C08F10/02B32B1/00
CPCA61L31/048A61J1/10A61J1/1468C08L23/0815C08L2205/025C08L2205/03C08L2207/066C08L2207/062B32B7/12B32B2250/242B32B2307/7242B32B2307/412B32B27/18B32B2307/732B32B2439/46B32B2439/80B32B27/20B32B2250/03B32B27/32B32B27/08B32B2307/306C08F2410/06C08F4/65916C08F4/65912C08F4/65927C08F210/16C08F4/65925C08L23/06C08L23/04C08F210/14C08F2500/03C08F2500/07C08F2500/12C08F2500/08B32B2250/40B32B2270/00B32B1/00
Inventor 中尾英誉茂吕义幸
Owner TOSOH CORP
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