Pipes made from a polyethylene copolymer with slow crack growth
US8962116B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 26, 2011 |
| Grant date | Feb 24, 2015 |
| Priority date | — |
| Expiry date | Oct 27, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1397
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a pipe consisting of a polyethylene composition which comprises—a base resin, comprising •a first ethylene homo- or copolymer (A): and •a second ethylene copolymer (B); and the polyethylene composition further comprises—a phenol-type stabilizer (C); and—a phenol-type stabilizer (D); whereby stabilizers (C) and (D) are different. The present invention is furthermore directed to the use of—a phenol-type stabilizer (C); and—a phenol-type stabilizer (D); whereby stabilizers (C) and (D) are different and, optionally,—a further stabilizer (E) selected from •phosphorous containing stabilizer (E1); •sulphur containing stabilizers (E2); •nitrogen containing stabilizers (E3); and/or •mixtures thereof; for increasing the slow crack growth resistance of pipes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.