Stabilising polymers
CA 1201546 A · Owner: Croda Synthetic Chemicals Limited · Inventors: Scott, Gerald; Al-Malaika, Sahar N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for improving the stability of a polymer comprises mixing the polymer with a sulphurcontaining compound under conditions which cause oxidation of the compound, and adding an ultra-violet stabiliser to the polymer. Oxidation may be achieved by conducting the mixing in closed apparatus in the, presence of a peroxide, or in apparatus open to the atmosphere. The uv stabiliser may be added before mixing, e.g. chemically incorporated in the sulphurcontaining compound.
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
- Granted March 4, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 4, 2003.
- 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.