Method for preparing reinforced multigrade bitumen/polymer and use of the resulting compositions for producing bitumen/polymer binders for surface coatings
US5880185A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1997 |
| Grant date | Mar 9, 1999 |
| Priority date | — |
| Expiry date | Aug 22, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/42
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Bitumen/polymer compositions with a broadened plasticity range are produced by contacting a bitumen or bitumen mixture with a sulphur-cross-linkable elastomer and a sulphur-donating coupling agent, at 100.degree.-230.degree. C. and under stirring conditions, to produce a cross-linked bitumen/polymer composition, then adding to the composition, maintained at 100.degree.-232.degree. C. and under stirring conditions, an acidic additive selected from polyphosphoric acids, acids of formula R--(COO).sub.t --SO.sub.3 H wherein t=0 or 1 and R is a monovalent hydrocarbyl radical having up to 12 carbon atoms, and mixtures of both types of acid separately or jointly with sulphuric acid, and maintaining the resulting reaction medium at 100.degree.-230.degree. C. and under stirring conditions for at least ten minutes. The bitumen/polymer compositions may be used directly or in diluted form to produce bituminous binders for making road surfaces, coated materials or sealing coatings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.