Process for the treatment of polymers based on cross-linked E.V.A. and applications
US5373067A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 1993 |
| Grant date | Dec 13, 1994 |
| Priority date | — |
| Expiry date | Feb 25, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/62
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention concerns a process for the treatment of cross-linked polymeric materials based on E.V.A. (ethylene vinyl acetate) with a view to obtaining polymeric fragments having a lower molecular mass. The process consists of incorporating the polymeric materials, after reduction to a particulate form, in a solvent, notably aromatic and/or halogenated, suitable for diffusing into the interior of the polymeric network and for swelling the latter, and subjecting the reaction medium to a stream of ozone. This process ensures a controlled cleavage of the cross-linked molecules without total destruction of the polymer or disruption of the functional groups. The products obtained may notably be used as modifying agents for hydrocarbon binders or aggregates treated with a hydraulic binder or again as coating binders for granulates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.