Method of compounding a multimodal polymer composition
US6031027A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1999 |
| Grant date | Feb 29, 2000 |
| Priority date | — |
| Expiry date | Mar 26, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/76
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of compounding a multimodal, preferably a bimodal polymer composition comprising a low molecular weight ethylene polymer and a high molecular weight ethylene polymer is described. The composition is compounded during a relatively long time at a low temperature which lies in a narrow temperature range including the melting point of the low molecular weight ethylene polymer. More particularly, the polymer composition is compounded, without addition of a beat transfer medium, in a temperature range from about 10.degree. C. below to about 10.degree. C. above the melting point of the low molecular weight ethylene polymer during a time of more than 10 seconds. The viscosity ratio between the ethylene polymers in said temperature range preferably is from about 5:1 to about 1:5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.