Blow molding polyethylene resins
a technology of polyethylene resin and blow molding, which is applied in the field of polyethylene resins, can solve the problems of low productivities, low disclosed catalyst productivities for low reactor temperature, and high development cost, and achieve the effect of high density and high strength
Inactive Publication Date: 2007-02-01
UNIVATION TECH LLC
View PDF21 Cites 23 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
[0008] Disclosed herein are various processes, including continuous fluidized-bed gas-phase polymerization processes for making a high strength, high density polyethylene copolymer, comprising (including): contacting monomers that include ethylene and optionally at least one non-ethylene monomer with fluidized catalyst particles in a gas phase in the presence
Problems solved by technology
As evidenced by the many earlier patents in the field of fluidized-bed gas phase polymerization, which include some of the patents listed on the face of this patent, the manufacture of polyethylene resins in a fluidized-bed gas phase process has been the subject of a great deal of development effort and expense.
One of the problems in using a fluidized-bed gas phase process to form polyethylene resins is making a resin with desirable properties, particularly properties appropriate for blow molding purposes, while still having a high productivity and avoiding production problems, e.g., sheeting and the like.
Further still, the disclosed catalyst productivities for low reactor temperatures are low.
Further, the processes involve low productivities.
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
examples
[0089] Polyethylene resin samples were prepared using catalysts made using different activation temperatures, and also using different polymerization conditions, as noted in Tables 1 and 2 below. All the examples are blow-molding products produced in a gas-phase, fluidized-bed polymerization pilot reactor. These examples illustrate the improvement in ESCR of a polyethylene resin when using certain catalyst specifications and reaction process conditions.
[0090] Catalysts employed in the Examples were prepared as follows. About 500 grams of a porous silica support containing 2.5 weight percent chromium acetate, which amounts to 0.5% Cr content (Grade 957HS chromium on silica, produced by Davison Catalyst division of W. R. Grace and Co) having a particle size of about 40 microns and a surface area of about 300 square meters per gram were dried by passing a stream of nitrogen through it for about 4 hours at about 150° C. About 400 grams of the dried supported chromium compound were then...
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
| Property | Measurement | Unit |
|---|---|---|
| Temperature | aaaaa | aaaaa |
| Temperature | aaaaa | aaaaa |
| Temperature | aaaaa | aaaaa |
Login to View More
Abstract
Disclosed herein are various processes, including continuous fluidized-bed gas-phase polymerization processes for making a high strength, high density polyethylene copolymer, comprising (including): contacting monomers that include ethylene and optionally at least one non-ethylene monomer with fluidized catalyst particles in a gas phase in the presence of hydrogen gas at an ethylene partial pressure of 100 psi or more and a polymerization temperature of 105° C. or less to produce a polyethylene copolymer having a density of 0.945 g / cc or more and an ESCR Index of 1.0 or more wherein the catalyst particles are prepared at an activation temperature of 700° C. or less, and include silica, chromium, and titanium.
Description
BACKGROUND [0001] 1. Field of Inventions [0002] This patent is related to polyethylene resins and continuous fluidized-bed gas-phase polymerization processes for making polyethylene resins. [0003] 2. Description of Related Art [0004] As evidenced by the many earlier patents in the field of fluidized-bed gas phase polymerization, which include some of the patents listed on the face of this patent, the manufacture of polyethylene resins in a fluidized-bed gas phase process has been the subject of a great deal of development effort and expense. [0005] One of the problems in using a fluidized-bed gas phase process to form polyethylene resins is making a resin with desirable properties, particularly properties appropriate for blow molding purposes, while still having a high productivity and avoiding production problems, e.g., sheeting and the like. Therefore, it would be desirable to obtain a resin product with desirable properties, e.g., sufficiently high Environmental Stress Crack Resi...
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
Login to View More IPC IPC(8): C08F4/06
CPCC08F210/16C08F2/34C08F4/24C08F210/08C08F2500/14C08F2500/13C08F2500/12C08F2500/04C08F210/14C08F10/02C08F210/02
Inventor CANN, KEVIN JOSEPHEISINGER, RONALD S.GOODE, MARK GREGORYMOOREHOUSE, JOHN H.MURE, CLIFF R.JAKER, STEPHEN P.APECETCHE, MARIA A.
Owner UNIVATION TECH LLC