Polyethylene resin composition for injection molding container cover

A polyethylene resin, injection molding technology, applied in applications, household components, household appliances, etc., can solve problems such as widening molecular weight distribution, difficulty in injection molding, and inability to cut bridges, so as to maintain stress crack resistance, Effect of improving injection moldability

Active Publication Date: 2012-08-22
JAPAN POLYETHYLENE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, due to the widening of the molecular weight distribution, slight defects occurred in continuous compression molding (CCM), making high-speed injection molding difficult
Specifically, the container lid cracks in the longitudinal direction, anisotropy of shrinkage, and dimensional instability
In addition, there are problems such as that the bridge part for opening and closing the cover cannot be cut off.

Method used

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  • Polyethylene resin composition for injection molding container cover
  • Polyethylene resin composition for injection molding container cover
  • Polyethylene resin composition for injection molding container cover

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104]

[0105] A Ti-based catalyst prepared by a solvent extraction method is used as a solid catalyst component. Its production method is as follows.

[0106] The inside of a 1-liter three-necked flask equipped with a stirrer and a cooler is fully replaced with nitrogen, and then 250 ml of dry hexane, 11.4 g of anhydrous magnesium chloride and 110 ml of n-butanol that have been pulverized in a 3-liter vibration mill for 1 hour are added. , heated at 68°C for 2 hours to obtain a homogeneous solution (1a). After cooling this solution (1a) to room temperature, 8 g of methylpolysiloxane having a kinematic viscosity of 25 cSt at 25° C. was added thereto, followed by stirring for 1 hour to obtain a uniform solution (1b). After the solution (1b) was cooled with water, 50 ml of titanium tetrachloride and 50 ml of dry hexane were added dropwise thereto over 1 hour using a dropping funnel to prepare a solution (1c). The solution (1c) was homogeneous, and no complex compound of the...

Embodiment 2～3

[0117] Except the conditions shown in Table 1, it carried out similarly to Example 1. Table 2 shows the evaluation results of the obtained polymer. The obtained polymer was excellent in mechanical properties such as tensile yield strength, flexural modulus, and FNCT, and had an appropriate shrinkage anisotropy (MD / TD).

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Abstract

Disclosed is a resin composition for injection molding container cover, which has advantages of high-speed formability, high fluidity, balance of rigidity and impact resistance, excellent stress crack resistance, sliding performance, less peculiar smell, good food safety. The polyethylene resin composition for the injection molding container cover is characterized in that the polyethylene resin composition contains 20 wt.%-40 wt.% of vinyl polymer (A) and 60 wt.%-80 wt.% of vinyl polymer (B), wherein, the vinyl polymer (A) is 1g / 10min-10g / 10min in HLMFR and is 0.910g / cm<3> -0.950g / cm<3> in density; and the vinyl polymer (B) is 30g / 10min-150g / 10min in MFR and is more than 0.960g / cm<3> in density; (i) of the polyethylene resin composition is 1g / 10min-10g / 10min in MFR, is 70g / 10min-400g / 10min in HLMFR, and the HLMFR / MFR is 40-80; and (ii) of the polyethylene resin composition is 0.953g / cm<3> -0.965g / cm<3> in density.

Description

technical field [0001] The present invention relates to a polyethylene resin composition for a cap of a container containing a liquid such as a soft drink, especially a liquid of a carbonated drink. A polyethylene resin composition for container caps that is excellent in impact resistance, stress crack resistance, sliding properties, low odor, food safety, cap opening and closing properties. Background technique [0002] Plastic containers are excellent in various physical properties, moldability, lightness, economy, etc., and are suitable for recyclability to solve environmental problems, so they are widely used in daily necessities and industrial products in recent years, and are superior to existing ones. Containers made of metal, glass, etc. [0003] Among plastic containers, so-called PET bottles (containers made of polyethylene terephthalate) are recognized as containers for food and beverages due to their excellent mechanical strength, transparency, high gas barrier ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/04B29C45/00B29L31/56
Inventor 伊林邦彦加贺谷一平平本知己
Owner JAPAN POLYETHYLENE CORP
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