Composites of polyurethanes and vinyl polymers
CA 1068449 A · Owner: The Dow Chemical Company · Inventors: Olstowski, Franciszek; Parrish, Donald B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a process for preparing polyurethane/vinyl polymer articles and to the articles prepared from the process. The process comprises (1) admixing a liquid polyol, a polyisocyanate a catalyst, for urethane formation, an ethylenically unsaturated monomer and a catalyst for polymerising an ethylenically unsaturated monomer, (2) pouring the reaction mixture into a mold and allowing it to react and to solidify and (3) demolding the resultant articles from the mold. The process of the invention is characterized in that in step (1) one employs a liquid polyol having from 2 to 8 hydroxyl groups per molecule and having a hydroxyl equivalent weight from 30 to 250. The process is …
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 December 18, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 18, 1996.
- 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.