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Coating composition, method of preparation thereof and substrate coated therewith

A technology of composition and coating, applied in coating, thin material handling, transportation and packaging, etc., can solve the problem of not giving examples of metallocene catalyst etc.

Active Publication Date: 2007-09-12
ボレアリステクノロジーオイ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no examples of metallocene catalysts are given and all multimodal ethylene polymers in the examples of WO97 / 03139 were prepared using Ziegler-Natta catalysts

Method used

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  • Coating composition, method of preparation thereof and substrate coated therewith

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0070] Polymerizations were carried out in a 5.2 liter bench scale reactor (PMC reactor) containing a premix chamber. Ethylene, hydrogen and comonomer were mixed and heated in the PMC prior to introduction into the reactor and added continuously during the polymerization. Polymerization was carried out in isobutane at 80° C. and about 20 bar. A supported single-site catalyst based on di-n-butylcyclopentadienyl hafnium dichloride activated with MAO was used as catalyst.

[0071] Bimodal polymerizations are carried out in the slurry-slurry phase. Slurry-gas phase conditions can be simulated and polymerizations performed as slurry-gas phase. When the gas phase polymerization takes place for several hours, it is decided to conduct the polymerization in a time-saving manner. Unimodal polymerizations were performed prior to bimodal experiments in order to find suitable polymerization conditions to achieve MFR, density and comonomer content for the first step. Then use the same c...

Embodiment 2

[0079] Polyethylene was produced in a bench scale reactor at 90°C. The polymerization medium was isobutane and the total pressure was 24.2 bar. No comonomer was added to the reactor. Hydrogen is fed together with ethylene. The concentration of hydrogen in ethylene is 3700ppm. The partial pressure of ethylene is 6.5 bar. Production of 1940g MFR 2 134 g / 10 min of polymer. The density is 975kg / m 3 . This polymer is then used as one of the blending components.

[0080] A further component used for blending was prepared in a bench reactor. The reactor temperature was 65°C. The polymerization medium is isobutane. The total pressure is 20 bar. The comonomer content in isobutane was 2.5% by weight. No hydrogen was fed into the reactor. The partial pressure is 10.3 bar. The polymerization time was 60 minutes. Produce 2510g MFR 2 =0.07g / 10min and Mw=285000 and density is 916kg / m 3 of polymers. The MWD is 2.6.

[0081] Two independently produced polyethylenes were comp...

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Abstract

A coating composition, a process for producing it and substrate coated therewith are described. The composition comprises a multimodal ethylene polymer, which contains from 80 to 99.8% by weight of ethylene repeating units and from 0.2 to 20% by weight of C3-C20 α-olefin repeating units, and is a blend of at least a first and a second ethylene polymer prepared by polymerization in the presence of a single site catalyst system. The blend has a density of 0.915-0.955 g / cm3, a melt flow rate, MFR2, of 0.028-1.5 g / 10 min., a molecular weight distribution, Mw / Mn, of 3-10, and a CTL 5.0 MPa-value according to ISO 6259 of at least 500 hrs.

Description

technical field [0001] The present invention relates to coating compositions, methods of making the coating compositions, and substrates coated with the compositions. Background technique [0002] Solid substrates often have coatings, eg to provide protection. As examples of such substrates, mention may be made of pipes, conduits, profiles, wires, cables and the like. The coating preferably comprises a polymer composition melt-coated on the substrate, for example by extrusion. Among the desired properties of the polymeric coating composition, it is particularly preferred that it has good melt coating processability, good environmental stress crack resistance (ESCR), low shrinkage and high service temperature. [0003] Coating compositions comprising multimodal ethylene polymers are known from WO 97 / 03139. This multimodal ethylene polymer contains 80-100 wt% ethylene repeating units and 0-20 wt% C 3 -C 10 α-olefin repeating unit, density between 0.915g / cm 3 to 0.955g / cm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D123/08C08F210/16C08F4/659C08F10/02C08F110/02C08L23/08
CPCY10S526/943C08L23/0815C08F4/65916C08F210/16C08F4/65912C08L2205/02C08L2314/06C08L2308/00C09D123/0815C08F110/02C08F10/02Y10T428/1393Y10T428/31692Y10T428/31938C08F4/65925C08L2666/06C08F2500/07C08F2500/12C08F2500/13C08F210/14C08F2500/05
Inventor S·约翰森C·林德C·吕丁
Owner ボレアリステクノロジーオイ