Process for preparing in aqueous emulsion a bitumen/polymer binder with continuous three-dimensional polymeric structure and application of this binder to the production of facings or bituminous mixes
US5382612A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 1992 |
| Grant date | Jan 17, 1995 |
| Priority date | — |
| Expiry date | Apr 8, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L95/005
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process is provided for preparing in aqueous emulsion, a bitumen/polymer binder with a continuous three-dimensional polymeric structure. The process comprises: PA1 a) forming a reaction mixture in an emulsion formation zone by feeding to the zone PA2 (i) a bitumen-polymer component comprised of a bitumen containing 0.5% to 15%, by weight of the bitumen, of a sulphur-crosslinkable elastomeric polymer, the bitumen/polymer component being in the form of a melt viscosity of not more than 2 Pa.s at the melt temperature, PA2 (ii) an aqueous phase containing an effective quantity of an emulsifying system, and PA2 (iii) a crosslinking system donating sulphur in a quantity such as to provide 0.5 to 20% by weight of sulphur relative to the weight of the elastomeric polymer contributed by the bitumen/polymer component, and PA1 b) maintaining the reaction mixture in the emulsion formation zone at an appropriate temperature until an aqueous emulsion of bitumen/polymer binder is obtained, in which the polymer of the binder is at least partially crosslinked to a three-dimensional structure. The bitumen/polymer binder is useful for coating road surfaces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.