Polymer composition for container closures

A composition, polymer technology, applied in the direction of containers, rigid containers, closures, etc., can solve the problems of not being able to provide, the performance is not very helpful, no residual stress or low level of residual stress in molded samples, etc., to achieve good flow sexual effect

Pending Publication Date: 2018-03-20
THAI POLYETHYLENE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Testing plastic articles using test samples may not provide realistic results due to no or low levels of residual stress in molded samples
Therefore, the performance of sample test blocks for stress cracking testing may not be very helpful

Method used

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  • Polymer composition for container closures
  • Polymer composition for container closures
  • Polymer composition for container closures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-2

[0050] Embodiment 1-2 (comparison)

Embodiment 1

[0051] Examples 1 and 2 are comparative resins as bimodal polyethylene compositions produced by Ziegler-Natta catalysts. Embodiment 1 is commercialization bimodal polyethylene Superstress CAP602 (Ineos). Example 2 is a bimodal polyethylene composition polymerized according to the conditions in Table 1.

Embodiment 3-5

[0052] Embodiment 3-5 (invention example)

[0053] Examples 3 to 5 are bimodal polymer compositions according to the invention. Example 5 contained 100 ppm of nucleating agent (Hyperform ). Table 2 below lists the properties of the polyethylene compositions used in Comparative Examples 1 and 2 and Inventive Examples 3-5.

[0054] The results presented in Table 3 show that the samples of the present invention have an ICHT of less than 10 min. The inventive polyethylene composition provides a faster crystallization rate and better stress crack resistance as measured by FNCT and ESCR (Method B; F50) compared to the comparative examples.

[0055] In Examples 3 and 4 and Comparative Example 1, a typical MFR corresponding to a screw cap was synthesized 2 and density polyethylene composition. As shown in Table 3, Examples 3 and 4 show that the higher the ethylene copolymer molecular weight (Mw), the wider the molecular weight distribution as shown by the polydispersity index ...

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PUM

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Abstract

The invention relates to a polymer composition for container closures. The present invention relates to a polymer composition comprising an ethylene homopolymer and an ethylene copolymer having a comonomer content comprising a comonomer in an amount of at least 0.55 mol% with respect to the total amount of monomer in the ethylene copolymer, wherein the ethylene copolymer has a higher weight average molecular weight than the ethylene homopolymer, the polymer composition has a density in the range of 0.950-0.965 g / cm<3> , a melt flow rate (MFR2) of at least 0.3 g / 10 minutes, a weight average molecular weight of at least 100,000 g / mol, and a viscosity eta 0.01 at an angular frequency of 0.01 [1 / s] of at least 20,000 Pa.s, wherein the polymer composition has an isothermal crystallization half-time ICHT which is less than 10 minute at 123 DEG C and a full notch creep test FNCT of at least 60 hours.

Description

technical field [0001] The present invention relates to a polymer composition and a container closure comprising the polymer composition. Background technique [0002] Improved materials and closure designs are known to result in one-piece closures that provide the same sealing surface as two-piece closures, enabling such polyethylene closures to be widely used in carbonated soft drink and hot fill applications. [0003] Polyethylene is known to be a material that provides all the necessary properties required for cap applications, including high environmental stress crack resistance, good CO 2 Retention, good balance between hardness and toughness, fast cycle times, good opening torque and good organoleptic properties. Various polymer compositions with different properties for closures and caps are disclosed in US2013 / 0237652 A1 , EP2365995 B1 , EP2052026 B1 and EP1462378 A2. However, properties of Environmental Stress Crack Resistance (ESCR) and fast cycle times that all...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L23/08
CPCC08F210/02B65D23/00C08F2/01C08F2/60C08F4/32C08F4/44C08F10/02C08F10/00C08F10/14C08F10/08C08F2800/10C08F2800/00C08F2800/20B29C45/00B29C45/17C08L23/06C08L23/0815C08L2205/24C08F2/001C08L2203/10C08L2207/062C08L2205/025C08F210/16C08F2500/05C08F2500/07C08F2500/12C08F2500/17C08F4/65C08L23/04C08K5/0083C08K5/09C08K5/098B65D41/00C08L2205/02C08F2500/18C08F2/00
Inventor萨兰亚·特莱西兰农瓦差里·奇瓦斯里伦格隆吉滴蓬·孔撒松塔亚·斯里蒙
OwnerTHAI POLYETHYLENE CO LTD