Faster preparation of polyurethane coating solutions
CA 1069237 A · Owner: Basf Wyandotte Corporation · Inventors: Patton, John T. (Jr.); Parekh, Manher
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, Disclosed is a novel procedure for making solventbased polyurethane or polyurethane-polyurea compositions which makes it possible to avoid the production of compositions that are undesirably underpolymerized or over polymerized. Moreover, the invention shortens the over-all time required to produce the composition. In essence the, invention involves a reversal in the order of steps usually \, used for making compositions of this sort: after a desired quasi-prepolymer of polyisocyanate and polyol is formed a, relatively small amount of secondary amine is added. The main polymerization with polyols and/or polyamines and the like is then permitted to take place. …
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 January 1, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 1, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.