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Oxygen tailoring of polyethylene resins

A technology of polyethylene and polyethylene film, which is used in manufacturing tools, ceramic molding machines, ceramic molding workshops, etc., can solve problems such as improvement of optical properties that are not mentioned.

Inactive Publication Date: 2007-07-25
UNIVATION TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Again, no mention of improvements in optical properties

Method used

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  • Oxygen tailoring of polyethylene resins
  • Oxygen tailoring of polyethylene resins
  • Oxygen tailoring of polyethylene resins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0054] Film thickness is measured according to ASTM D374-94 Method C.

[0055] Film thickness deviations were determined using a Measuretech Series 200 instrument. This instrument measures film thickness using a capacitance thickness gauge. For each film sample, ten film thickness points are measured per inch of film as the film passes the thickness gauge in the transverse direction. Three film samples were used to determine the thickness deviation. Thickness variation is determined by dividing the entire range of film thicknesses (maximum minus minimum) by the average thickness and dividing the result by two. Thickness deviation is expressed as a percent change from the mean.

[0056] Dart impact values ​​were determined using the procedure in ASTM D1709-98 Method A, except that film thickness was measured according to ASTM D374-94 Method C.

[0057] Elmendorf tear strength (machine direction, "MD"; ​​and transverse direction, "TD") was determined using the procedure in A...

Embodiment A

[0066] The device used to tailor the above polyethylene is a Coperion (Werner-Pfleiderer) ZSK-57 co-rotating twin-screw extruder. The schematic diagram is figure 3 and this figure shows the processing section (1) of the machine. The processing section comprises a barrel (2) and a screw (4) formed from modular elements. The resin, Exceed(R) 1018CA (available from Exxon Mobil Chemical Company, Houston, TX) in pellet or pellet form, had a nominal melt index of 1.0 g / 10 min, 0.918 g / cm 3 Resin of nominal density, compounded with 500ppm of Irganox(R)-1076 (both available from Ciba Specialty Chemicals, Basel, Switzerland) and 2000ppm of Weston 399 (available from GE Specialty Chemicals) and 800ppm of Dynamar(R) FX5920 (available available from 3M Company), the resin is fed to processing section (1 ) and conveyed from feed end (3) to discharge end (9). The processing section is divided into a melting zone (5) formed by kneading and counter-conveying screw elements and a melt convey...

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Abstract

Methods of tailoring polyethylenes are contemplated utilizing 0.5 to 70 volume percent oxygen containing gases. The tailoring occurs in a melt-conveying zone of a mixer / extruder, and not in the feed or melting zones of a mixer / extruder. The effect of tailoring is to decrease the haze and / or increase the gloss of blown films made from the tailored polyethylenes compared to similar polyethylenes that are extruded / mixed in the substantial absence of oxygen or oxygen containing gases.

Description

[0001] technical field of invention [0002] Embodiments of the present invention provide methods of oxygen tailoring polyethylene resins to improve the optical properties of films made from such resins. Background of the invention [0003] Tailoring of resins, such as polyethylene homopolymer or copolymer resins, is a known method of altering the molecular architecture and thus the bulk properties of the resin and its articles. Tailoring involves treating polyethylene resins with agents such as peroxides or oxygen that controllably alter the resin. Hitherto, the effect of tailoring polyethylene resins was thought to affect rheological properties exclusively and generally can show an increase in zero-shear viscosity, elasticity (G' / G ”) and increased shear-thinning behavior of the tailored pellets. These changes contribute by reducing expansion during blow molding, reducing sagging during pipe extrusion, increasing bubble film stability, reducing film re- Thickness fluctuati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/06C08J5/18B29C47/00C08J3/14B28B15/00B29B13/00B29C48/09B29C48/295
CPCB29C47/0023C08F8/00B29K2105/256B29B9/06B29B9/12B29K2023/06B29C47/1072B29C47/0004B29C48/022B29C48/09B29C48/295C08F10/02
Inventor 李东明吕清泰
Owner UNIVATION TECH LLC
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