Process for the preparation of bitumen-polymer compositions, application of the compositions obtained to the production of coatings and polymer master solution for obtaining the same compositions
US5605946A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1995 |
| Grant date | Feb 25, 1997 |
| Priority date | — |
| Expiry date | Nov 6, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L95/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process is provided for the preparation of a bitumen-polymer composition which comprises PA1 (a) producing at a temperature of between 100.degree. C. and 230.degree. C., a mixture of PA2 (i) a bitumen; PA2 (ii) a linear block copolymer of styrene and a conjugated diene, the block copolymer being used in a quantity of from 0.5% to 25% by weight of bitumen and having a weight-average molecular weight of between 170,00 and 250,000 and a structure of A-B with A denoting a polymer block consisting of a polystyrene block which may be extended on the B side by a random copolymer of styrene and of the conjugated. diene and B denoting a polymer block consisting of conjugated diene units, and PA2 (iii) a coupling agent containing at least one sulphur-donor compound and used in an amount to provide a quantity of sulphur representing, by weight, 0.1% to 10% of the weight of the liner block copolymer of styrene and conjugated diene; and PA1 (b) keeping the mixture thus produced at a temperature of between 100.degree. C. and 230.degree. C. and with stirring, for a period of at least ten minutes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.