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Polypropylene ethylene-propylene copolymer blends and in-line process to produce them

A propylene copolymer, polypropylene technology, applied to polypropylene ethylene-propylene copolymer blends and the on-line field of producing it, can solve problems such as increasing costs

Active Publication Date: 2011-01-12
EXXON RES & ENG CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite increased production flexibility, the parallel reactor arrangement requires the installation of blending vessels, which increases the cost of the process

Method used

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  • Polypropylene ethylene-propylene copolymer blends and in-line process to produce them
  • Polypropylene ethylene-propylene copolymer blends and in-line process to produce them
  • Polypropylene ethylene-propylene copolymer blends and in-line process to produce them

Examples

Experimental program
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Effect test

Embodiment

[0357] Examples of propylene polymerization of the present disclosure under supercritical conditions:

[0358] All polymerizations were carried out in a bulk polymerization system (ie, no solvent was used, other than that introduced by the catalyst solution, no more than 10 wt %), and there was no monomer recycle.

[0359]All polymerization experiments were performed in a Continuous Stirred Tank Reactor (CSTR) manufactured by Autoclave Engineers, Erie PA. The reactor was designed to operate at a maximum pressure and temperature of 207 MPa (30 kpsi) and 225°C, respectively. The nominal reactor volume is 150 mL and the working volume is 127 mL (working volume is lower due to being inside the reactor). The reactor was equipped with an electric heater and a stirrer with magnetic drive. A pressure sensor located on the monomer feed line measures the pressure in the reactor. The temperature inside the reactor was measured using a K-type thermocouple. Reactor overpressurization...

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PUM

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Abstract

Ilsotactic polypropylene ethylene-propylene copolymer blends and in-lineprocesses for producing them. The in-line process for producing the blend includes providing two or more parallel reactor trains and a separator for product blending and product-feed separation; wherein the two or more reactor trains operate under fluid phase bulk homogeneous conditions and at least one of the trains operates under supercritical conditions.

Description

technical field [0001] The present invention relates to the field of polymer blends and in-line methods of producing polymer blends. More specifically, the present invention relates to blends of isotactic polypropylene and ethylene-propylene copolymers and an in-line fluid phase process for producing the same. Background technique [0002] Blends of highly crystalline isotactic polypropylene (iPP) and soft ethylene-propylene (EP) copolymers find a variety of uses where rapid processing requires combining flexibility and softness with rapid crystallization. These are typically iPP-EP blends made by melt blending iPP resins and EP copolymer resins. The offline melt blending process greatly increases the production cost because it involves two liquefaction-granulation steps of the two blend components, and then the final product blend is melt blended and pelletized, and there are also many shortcomings. [0003] Polymer blends can be prepared in various ways. Current flexib...

Claims

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Application Information

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IPC IPC(8): C08L23/00C08L23/04
CPCC08L2314/02C08F210/06C08F110/06C08L23/0815C08L2314/06C08L23/10Y02P20/54C08L2666/06C08F2500/12C08F2500/20C08F2500/03C08F210/16
Inventor 加博尔·基斯帕特里克·布兰特罗伯特·P·雷诺兹阿斯比·K·梅塔马尼卡·瓦尔马-奈尔约翰·W·舒史蒂文·P·拉克
Owner EXXON RES & ENG CO
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