Method for preparing bitumen/polymer compositions, application of compositions obtained in producing surfacing materials bitumen/polymer bindersand mother polymer solution for obtaining the said compositions
CA 2258795 C · Owner: Totalfinaelf France · Inventors: Lacour, Claude; Zins, Annie; Planche, Jean-Pascal
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a method for producing bitumen/polymer compositions which consists in contacting between 100 ·C and 230 ·C and under agitation a bitumen or a mixture of bitumen's with at least one styrene and butadiene copolymer having a global butadiene content ranging between 50 % and 95 wt. % and a content of butadiene 1,2 double-bond structural units ranging between 12 % and 50 wt. % of the copolymer and, preferably also a sulphuring coupling agent or a functionalising agent. Said bitumen/polymer compositions are usable directly or after dilution, for forming bitumen/polymer binders for surfacing materials.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed April 17, 1998 and granted January 4, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 17, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 17, 2020.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.