Polymer products and multi-stage polymerization processes for the production thereof
一种气相聚合、阶段的技术，应用在烯烃聚合领域，能够解决缺乏分子量控制等问题
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
example
[0120] The following examples are set forth to provide those skilled in the art with a complete disclosure and description of how to make and use the methods and systems of the invention, and are not intended to limit the scope of what the inventors regard as their invention.
[0121] In all examples, Catalyst A and Catalyst B were used. Catalyst A is XCAT TM HP-100 catalyst was obtained from Univation Technologies, Houston, TX. XCAT TM The HP-100 catalyst is a single site metallocene catalyst. Catalyst B is a single site transition metal coordination catalyst. Catalyst B is a comparative catalyst used to evaluate the performance of Catalyst A in the following examples.
example 1
[0123] Ethylene was polymerized using Catalyst A or Catalyst B (comparative) in a small slurry phase reactor. A series of operations were carried out using Catalyst A or Catalyst B. In each run, the slurry contained ethylene and comonomer in propane diluent (1350ml). The comonomer included in the slurry was 1-hexene (37ml). The ethylene concentration in the loop reactor was 12 mole%. The reactor was operated at 80°C and a pressure of 38 bar. Polymerization was performed for 60 minutes each. Compared to Catalyst B, Catalyst A was observed to be process stable as there was no activity decay during the 60 min polymerization.
[0124] figure 1 The MFR (190° C. / 2.16 kg) of the resulting polymer is shown versus the catalyst activity in the different runs of Catalyst A and Catalyst B. The MFR of polyethylene is measured according to ASTM D 1238 (190°C / 2.16 kg). Activity is measured as kg polyethylene / g polymerization catalyst-hour. from figure 1 It can be seen that the metal...
example 2
[0126] An additional series of ethylene polymerization operations were carried out using Catalyst A in a small slurry phase reactor. In each run, the slurry contained ethylene and comonomer in propane diluent (1350ml). The comonomer included in the slurry was 1-hexene in an amount of 12 ml to 37 ml. The ethylene concentration in the loop reactor was 12 mole%. The reactor was operated at 80°C and a pressure of 38 bar. Hydrogen was added to the reactor to a partial pressure of 0.5 bar (addition of 12 ml 1-hexene). The comonomer concentration was adjusted to provide a polymer with an MFR (190°C / 2.16 kg) of 210 g / 10 min. Polymerization was performed for 60 minutes each. The resulting polymer had a relatively low bulk density (140 g / cm3). figure 2 Catalyst activity in different runs of Catalyst A is shown graphically with respect to 1-hexene concentration.
PUM
| Property | Measurement | Unit |
|---|---|---|
| density | aaaaa | aaaaa |
| density | aaaaa | aaaaa |
| density | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More