Check patentability & draft patents in minutes with Patsnap Eureka AI!

High pressure polymerisation process for producing ethylene copolymers

A technology of ethylene copolymers and vinyl acetate copolymers, which is applied in the field of preparation of ethylene copolymers and can solve problems such as reduced mechanical properties and excessive shrinkage

Pending Publication Date: 2020-04-24
EXXONMOBIL CHEM PAT INC
View PDF8 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, autoclave reactor polymers tend to show deficiencies in conversion (flux) and final product properties (e.g., excessive shrinkage and reduced mechanical properties) when compared to tubular reactor products

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High pressure polymerisation process for producing ethylene copolymers
  • High pressure polymerisation process for producing ethylene copolymers
  • High pressure polymerisation process for producing ethylene copolymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0072] use with figure 1A similar tubular reactor as shown prepared two experimental ethylene-vinyl acetate (EVA) copolymers with 28 wt% vinyl acetate content (or derived units) and different melt indices (MI), in Example 1 25MI, 30MI in embodiment 2. They were compared against a control product (Example 3) prepared simultaneously in the same tubular reactor. The reactor conditions for the three different runs are given in Table 1 below. In each test, the modifier was propylene. In Examples 1 and 2, the initiator package consisted of 210 pounds of di(2-ethylhexyl) peroxydicarbonate (EHP), 105 pounds of t-butyl peroxypivalate (pivalate), 9 Irganox 1076, 0.8 lb Isopar H, and 100 U.S. gallons of butane, while in Example 3 the initiator package consisted of 70 lb t-butyl peroxyneodecanoate (decanoate), 70 lb neodecanoate tert-butyl valerate (pivalate), 70 lbs tert-butyl peroxy-2-ethylhexanoate (peroctoate), 9 lbs Irganox 1076, 0.8 lbs Isopar H, and 100 US gallons of butane co...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
electrical resistivityaaaaaaaaaa
polydispersity indexaaaaaaaaaa
refractive indexaaaaaaaaaa
Login to View More

Abstract

A process for producing an ethylene copolymer, the process including: (a) contacting ethylene with at least one polar comonomer in the presence of at least one modifier and at least one free radical initiator in a tubular reactor under polymerization conditions including a pressure of from 225 to 270MPa; (b) injecting the at least one free radical initiator into the reactor at a plurality of reaction zones spaced along the length of the reactor, wherein each reaction zone comprises an inlet and an outlet; (c) maintaining the temperature at the inlet of each reaction zone at 150 DEG C or less,and the temperature at the outlet of each reaction zone is at least 177 DEG C; (d) controlling the modifier flow at a rate of from 0.02 to 0.986 wt% of the copolymer; and (e) recovering the ethylene copolymer from the tubular reactor, is provided.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of Serial No. 62 / 539,197 filed July 31, 2017, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to the preparation and use of ethylene copolymers containing polar comonomers, especially vinyl acetate, produced in tubular and / or autoclave reactors. Background technique [0004] High pressure ethylene copolymers containing polar comonomers (e.g. vinyl acetate) have a wide range of applications including film production, hot melt adhesive formulation, coatings, extrusion coating, extrusion and coextrusion, blow molding , lamination, injection molding, wire and cable and resin modification. Recently, interest has focused on the use of high-voltage ethylene-vinyl acetate copolymers (EVA) as encapsulants for solar cells due to their transparency, stability, durability, and ease of processing. [0005] High-...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/02C08F218/08C08F2/34C08F2/02
CPCC08F210/02C08F2/02C08F218/08C08F2500/09C08F2500/12C08F2/34C08F2/38C08F2/01C08F2/001C08K5/01C08K5/14
Inventor P·拉杰什拉贾J·D·达利A·K·戈什A·克莱布L·M·范登博斯舍P·J·克莱曼斯
Owner EXXONMOBIL CHEM PAT INC
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com