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Polyethylene resin molding material for container lid

A polyethylene-based resin and molding material technology, applied in bottle/container caps, capping containers with caps, applications, etc., can solve the problems of insufficient molding speed, insufficient stress cracking resistance, and reduced stress cracking resistance etc. to achieve excellent food safety, high fluidity, and improved mechanical properties

Active Publication Date: 2015-01-14
JAPAN POLYETHYLENE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] In addition, Patent Documents 14 and 15 disclose polyethylene resin compositions capable of improving high rigidity and high fluidity for container caps. They are suitable for container caps for soft drinks with low internal pressure such as tea drinks, but due to stress resistance Difficult to use for carbonated drinks due to lack of cracking performance
Patent Document 16 discloses a resin molding material that maintains stress-cracking resistance and can be thinned and highly rigid. However, there is a problem that the stress-cracking resistance decreases when the fluidity is further improved, and it is not sufficient for high-speed molding.
Patent Document 17 discloses a polyethylene resin composition for injection molding container caps, but it is not necessarily suitable for continuous compression molding (CCM) for high-speed molding

Method used

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  • Polyethylene resin molding material for container lid
  • Polyethylene resin molding material for container lid
  • Polyethylene resin molding material for container lid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0210] (manufacture of catalyst)

[0211] 115 g of magnesium ethoxide, 151 g of tri-n-butoxytitanium monochloride, and 37 g of n-butanol were mixed at 150° C. for 6 hours and homogenized. Then lower the temperature to 60°C and add n-hexane to form a homogeneous solution. Next, 457 g of ethyl aluminum sesquichloride (ethyl aluminum sesquichloride) was dripped at predetermined temperature, and it stirred for 1 hour. The generated precipitate was washed with n-hexane to obtain 210 g of a catalyst component. The resulting solid was dried to form a powder. This powder contained 11.0% by weight of Mg and 10.5% by weight of Ti.

[0212] (manufacturing of polymers)

[0213] The solid catalyst component obtained above (production of the catalyst) was continuously supplied at 1.5 g / hr from the catalyst supply line to the first-stage polymerizer having an internal volume of 200 liters as the first-stage reactor, and was supplied from the organometallic compound supply line with Supp...

Embodiment 2~7

[0219] Except for the conditions shown in Table 1, it carried out similarly to Example 1, and obtained the ethylenic polymer. The "component (A)" and "component (B)" polymerized by the above-mentioned method were mixed in the ratio shown in Table 2, and the polyethylene-type resin molding material of this invention was manufactured. Table 2 shows the evaluation results of the obtained materials. The obtained material has high tensile yield strength, excellent mechanical properties such as flexural modulus, and is excellent in applicability to container caps requiring durability and the like.

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Abstract

A polyethylene resin molding material for a lid of a container for carbonated beverages and the like, which has excellent high speed moldability, high fluidity, stiffness, impact resistance, durability, heat resistance, lubricity, low smelling properties and safety for foods, having good opening properties and sealing properties, and also having improved stress cracking resistance and FNCT fracture properties upon being handled at higher temperatures, and which contains, as the main component, a polyethylene polymer that fulfills the following characteristic properties: (1) the melt flow rate (MFR) at a temperature of 190°C·and a load of 2.16 Kg is not less than 0.8 g / 10 minutes and less than 5.0 g / 10 minutes, the high-load melt flow rate (HLMFR) at a temperature of 190°C and a load of 21.6 Kg is 180 to 400 g / 10 minutes inclusive, and the HLMFR / MFR ratio is 80 to 200; (2) the density is 0.955 to 0.970 g / cm3 inclusive; and (3) a CSD value of a component having a molecular weight of 105 or more is 0.0 to 3.0 as determined based on a measurement value obtained by 13C-NMR spectrometry.

Description

technical field [0001] The present invention relates to a polyethylene-based resin molding material for container caps; more specifically, to a polyethylene-based resin molding material suitable for lids of containers containing liquids such as soft drinks, especially carbonated beverages; particularly, high-speed moldability , high fluidity, rigidity, impact resistance, stress crack resistance, sliding properties, low odor, food safety, cap opening and closing properties, etc., are generally excellent, and are also used for container caps with good long-term durability at high temperatures Polyethylene-based resin molding material. Background technique [0002] Plastic containers are excellent in various physical properties, moldability, light weight, economical efficiency, etc., and are also suitable for recyclability in response to environmental problems. Therefore, in recent years, they have surpassed existing metal, glass, etc. Used as daily necessities and industrial ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B65D41/00C08F4/646C08F10/02C08L23/04
CPCC08F210/16C08L23/04
Inventor 伊林邦彦加贺谷一平平本知己吉本圭一
Owner JAPAN POLYETHYLENE CORP
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