Highly flexible polyurethane plastics and coatings which are resistant to chemicals and a process for their production
CA 2015224 C · Owner: Gruber, Hermann · Inventors: Gruber, Hermann; Fehlbier, Alois
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for the preparation of highly flexible polyurethane plastics which are resistant to chemicals by reacting, a) a polyisocyanate component with b) a polyol component based on a liquid polybutadiene resin containing terminal hydroxyl groups and having a molecular weight of about 500 to 10,000 and, c) about 10 to 50% by weight of water based on the weight of, component b), in the presence of d) about 20 to 500% by weight, based on the weight of component b), of an alkaline earth metal hydroxide or oxide. The present invention also relates to the highly flexible polyurethane plastics, especially coatings produced, by this process.
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 24, 1990 and granted November 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 24, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 24, 2012.
- 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.