Ethylene copolymer with improved elasticity and processibility

A technology of ethylene copolymer and olefin comonomer, which is applied in transportation, packaging, and thin material processing, etc., and can solve the problems of reduced impact resistance and product hardness

Inactive Publication Date: 2013-03-27
SABIC NEXLENE CO PTE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This results in increased machinability but reduced impact resistance
When the copolymerization of ethylene with relatively low-density α-olefin is carried out to prevent the reduction of impact resistance, even if the impact resistance can be maintained at the same level, the hardness of the product is reduced

Method used

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  • Ethylene copolymer with improved elasticity and processibility
  • Ethylene copolymer with improved elasticity and processibility
  • Ethylene copolymer with improved elasticity and processibility

Examples

Experimental program
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Effect test

preparation Embodiment 1

[0162] Synthesis of bis(2-phenylphenoxy)(pentamethylcyclopentadienyl)titanium(IV) chloride

[0163] 2-Phenylphenol (1.72 g, 10.1 mmol, Aldrich 99%) was added to a dry flask and dissolved in 40 mL of toluene, then cooled to 0° C. while stirring well. The resulting mixture was slowly added dropwise to n-butyllithium (4.8 mL, 2.5M in hexane, Aldrich). After completion of the dropwise addition, the temperature of the resulting mixture was maintained for 1 hour and then raised to room temperature, followed by stirring for 12 hours. The temperature of the resulting mixture was lowered to 0° C., and thereto was slowly added dropwise pentamethylcyclopentadienyltitanium trichloride (1.64 g, 5.5 mmol) dissolved in 10 mL of toluene. After the dropwise addition was completed, the temperature of the resulting mixture was maintained for 1 hour and then raised to room temperature, followed by stirring for 1 hour. The reaction was carried out for 12 hours after raising the temperature of ...

Embodiment 1 to 6

[0167] Bis(2-phenylphenoxy)(pentamethylcyclopentadienyl)titanium(IV) chloride synthesized in Preparation Example 1 was used as a single active site in the second-stage reactors connected in series point catalysts, ie, transition metal catalysts. The amount of catalyst used is shown in Table 1. Ti stands for a single active site catalyst, and as a cocatalyst Al stands for triisobutylaluminum and B stands for triphenylmethyliniumtetrakispentafluorophenyl borate. Each catalyst was dissolved in xylene at a concentration of 0.2 g / L, 5.0 g / L or 1.5 g / L, respectively, and then injected. The synthesis was carried out with an ethylene feed ratio of 4:6 and utilized either 1-octene or 1-butene as comonomer for each reactor. However, when the conversion rate is low in order to adjust the polymer density and molecular weight in the first-stage reactor, the amount of ethylene fed into the second-stage reactor is based on the amount of unreacted ethylene flowing into the second-stage reac...

Embodiment 7 to 14

[0172] Bis(2-phenylphenoxy)(pentamethylcyclopentadienyl)titanium(IV) chloride synthesized in Preparation Example 1 was used as a single active site in the second-stage reactors connected in series Point catalyst. The amount of catalyst used is shown in Table 2. Ti stands for a single active site catalyst, and as a cocatalyst Al stands for triisobutylaluminum and B stands for tritylaluminum tetrapentafluorophenylborate. Each catalyst was dissolved in xylene at a concentration of 0.2 g / L, 5.0 g / L or 1.5 g / L, respectively. The synthesis was carried out at an ethylene feed ratio of 3.5:6.5 to 4.5:5.5 and utilized 1-octene or 1-butene as comonomer per reactor. However, when the conversion rate is low in order to adjust the polymer density and molecular weight in the first-stage reactor, the amount of ethylene fed into the second-stage reactor is based on the amount of unreacted ethylene flowing into the second-stage reactor Sure. The conversion rate in each reactor can be deter...

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Abstract

Provided is an ethylene copolymer with improved elasticity and processibility. More specifically, provided is an ethylene copolymer which exhibits a high zero shear viscosity and a large degree of shear thinning degree, and shows rheological characteristics behaviors differentiated from products manufactured by using the existing metallocene and Ziegler-Natta catalysts. In addition, provided is an ethylene copolymer which has a low processing load, shows differentiated behavior in Van-Gurp Palmen analysis, and exhibits excellent Neck-in characteristics.

Description

technical field [0001] The present invention relates to ethylene copolymers, and more particularly, to ethylene copolymers having improved elasticity and processability without reducing impact resistance and hardness. Background technique [0002] The mechanical properties of vinyl resin are affected by its molecular weight and its molecular weight distribution, so it is used in various fields. In general, the higher the molecular weight of polyethylene resin, the better its mechanical properties. However, high molecular weight polyethylene has low fluidity, which causes difficulties in processing. This can be a serious disadvantage in extrusion and injection molding where rapid deformation at high shear rates is required. [0003] Therefore, there has been research for improving the workability of copolymerization products of ethylene with α-olefins such as 1-butene, 1-pentene, 1-hexene and 1-octene while maintaining the mechanical properties of polyethylene products (e.g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/16C08F4/6592B29C45/00C08J5/18
CPCC08F4/65908C08J5/18C08F2420/04C08F4/65912C08F4/6592C08F210/16B29C45/00Y10T428/1352Y10T428/139Y10T428/31924C08F210/14C08F2500/01C08F2500/08C08F2500/12C08F2500/21C08F210/08C08F2500/02C08F2500/07C08F2/001
Inventor 权承范咸炯宅蔡圣锡吴世源丁贤郁
Owner SABIC NEXLENE CO PTE LTD
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