Mixtures of prepolymers containing urethane groups and diisocyanatotoluenes and their use
CA 2035252 A1 · Owner: Bayer Aktiengesellschaft · Inventors: Brock, Martin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a liquid mixture a, method of preparing a foam with the liquid mixture and the resultant foam; said liquid mixture having a viscosity at 25°C of 5 to 100 mPas and an NCO content of 35 to 47% by weight and comprising:, a) a liquid prepolymer containing urethane groups and having an NCO content of 5 to 30% by weight which is a reaction product of:, a1) a polyisocyanate or a polyisocyanate mixture is of the diphenylmethane series, and, a2) a polyester polyol having a molecular weight of 500 to 10,000 in a substoichiometric quantity; in admixture with, b) a diisocyanatotoluene and/or component a1) in a ratio by weight of a) to b) of 1:20 to 20:1.
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 January 30, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 30, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 30, 2013.
- 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.