Coextrusion binder, its use for a multilayer structure and the structure thus obtained
US6746738B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 6, 2000 |
| Grant date | Jun 8, 2004 |
| Priority date | — |
| Expiry date | Apr 6, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31938
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The present invention relates to a coextrusion binder comprising:5 to 30 parts of a polymer (A), itself comprising a blend of a polyethylene (A1) of relative density between 0.935 and 0.980 and of a polymer (A2) chosen from elastomers, very low-density polyethylenes and ethylene copolymers, the (A1)+(A2) blend being cografted with an unsaturated carboxylic acid;95 to 70 parts of a polyethylene (B) of relative density between 0.930 and 0.950;the blend of (A) and (B) being such that:its relative density is between 0.930 and 0.950,the content of grafted unsaturated carboxylic acid is between 30 and 10,000 ppm,the MFI (melt flow index) measured according to ASTM D 1238 at 190° C./21.6 kg is between 5 and 100.This binder is particularly useful for petrol tanks of structure: HDPE/binder/EVOH or PA/binder/HDPE.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.