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Improved polyolefin manufacturing process

A polyolefin, olefin polymer technology, applied in chemical instruments and methods, mixers with rotary stirring devices, dissolution, etc.

Inactive Publication Date: 2015-06-03
INEOS SALES (UK) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Undesirable levels of gel or white spots resulting in unusable polymer product

Method used

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  • Improved polyolefin manufacturing process
  • Improved polyolefin manufacturing process
  • Improved polyolefin manufacturing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] A series of tests was done using a Style 7 plus a Style 15 spindle (abbreviated 7 / 15) at various treat rates and temperatures, and then on the same equipment but with two Style 15 spindles (abbreviated 15 / 15) A set of experiments was carried out. Bimodal polyethylene polymers are used. The energy consumed by the mixer was measured as kWh / kg and the b-color and gel of the pellets were measured. The results of these tests are shown in the graph below.

[0063] b-color is a standard ASTM test for measuring yellowness of polymers. Lower numbers indicate less yellowness and a higher quality product. As shown in the table below, by using the dissimilar rotor orientation of the present invention, the b-color of the pellets was reduced from 11.7 to 2.5 when using a matched Farrell 15 / 15 rotor. In the case of multimodal polyethylene pellets, a b-color below 4.0 is preferred.

[0064] Gel area is a test that measures the amount of unmelted material in a film made from that m...

Embodiment 2

[0071] The difference between mixers running at constant speed and mixers running at non-constant speed was evaluated. A comparison was made between a commercial line running the same multimodal polyethylene, with mixer 1 running a 7 / 15 rotor at the same 300 rpm speed, and a second mixer running a 7 / 15 rotor, one running at 258 rpm and the other at 228 rpm run. The table below shows the difference in energy consumed at the same rate.

[0072] Mixer 1 Mixer 2 rotor 7 / 15 7 / 15 rate lbs / hr 13600 13500 Mixer energy kWh / kg 0.205 0.165 Rotor speed rpm 300 and 300 258 and 228

Embodiment 3

[0074] Trials were carried out in a 12" mixer where the specific energy was 0.20-0.23 and then where the energy was reduced to 0.17-0.19 kWh / kg. In two cases the rotors were run at different speeds, one at 258 rpm and the other At 228 rpm, and the polymer feed was multimodal polyethylene flakes. As shown in the table below, the process of the present invention resulted in a 50% higher rate at lower mixer energies. A key part of this increase was due to the addition of The melt in the mixer applies less energy, allowing the extruder to handle a more viscous melt. Single screw extruders are more efficient in handling viscous melt feeds and the melt is less viscous Attached to the screw, the extruder barrel is cooled and the melt is bonded to the barrel, and the viscous flow is stronger relative to the pressure flow. At the same time, the polymer feed plunger (stuffer ram) clearance (clearance) from about 0.75 "down to less than 0.5".

[0075] Case 1 Case 2 M...

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Abstract

The present invention relates to an improved process for compounding a polyolefin composition comprising providing feed components including one or more high molecular weight olefin polymer components and one or more low molecular weight polyolefin components. The high and low molecular weight components are then compounded together to create a molten homogeneous polyolefin mixture.

Description

technical field [0001] The present invention relates to an improved process for making polyolefin blends made from high molecular weight olefin copolymers and low molecular weight olefin copolymers. Specifically, the present invention relates to optimizing the balance between dispersive mixing and distributive mixing while maintaining product properties, improving energy input into the product, ensuring mix consistency and achieving Improved productivity. Background technique [0002] Polyolefin manufacturing methods are well known in the art and include methods for preparing monomodal and multimodal polymers depending on the requirements of the final polyolefin product. [0003] In particular, multimodal polyethylenes are well known in the art, as described in US Patent No. 6,730,751 and US Patent No. 7,193,017, the disclosures of which are hereby incorporated herein by reference. The term "multimodal" as used herein refers to the presence of more than one defined peak in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B7/00B29C47/36C08J3/00B01F7/04C08L23/00B29C48/08B29C48/09B29C48/10
CPCC08J3/005C08J2323/02C08J2423/02B29C48/08B29C48/09B29C48/10
Inventor W. 拉希姆R. E. 桑德
Owner INEOS SALES (UK) LTD