Polymer compositions having improved homogeneity and odour, a method for making them and pipes made thereof
US8530580B2 · kind B2 · utility
3Cited by
2References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 25, 2009 |
| Grant date | Sep 10, 2013 |
| Priority date | — |
| Expiry date | May 25, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/139
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention deals with polymer compositions suitable for making pipes. The compositions comprise a multimodal copolymer of ethylene and one or more alpha-olefins having from 4 to 10 carbon atoms wherein the multimodal ethylene copolymer has a density of from 924 to 960 kg/m3, a melt index MFR5 of from 0.5 to 6.0 g/10 min, a melt index MFR2 of from 0.1 to 2.0 g/10 min and a shear thinning index SHI2.7/210 of from 2 to 50. The compositions further have a level of volatile compounds of at most 100 ppm by weight and/or a homogeneity rating of at most 3. In addition the multimodal copolymer comprises:
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.