Permanently stabilized polyurethanes
CA 1109592 A · Owner: Bayer Aktiengesellschaft · Inventors: Lantzsch, Reinhard; Uhrhan, Paul; Arlt, Dieter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Permanently stabilized polyurethanes, Abstract of the Disclosure The invention is related to modified polyurethanes which have a permanent, wash-fast, acidresistant, dry cleaning-resistant and solvent-resistant stabilization based on 2,2,6,6-tetraalkyl-piperidine light protective agents. These stabilizers are an integral constituent of the polyurethanes that is to, say they take part in the polyurethane synthesis by the reaction of an H-active reactive group (for example NH2 NH-alkyl, CO-NH-NH2, NH-CO-NH-NH2, OH or some other H-active group) of the 2,2,6,6-tetraalkyl-piperidine derivatives with isocyanate group of polyisocyanates or isocyanate prepolymers.
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 September 22, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 22, 1998.
- 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.