Aqueous polyurethane dispersions based on 1-methyl-2,4-and/or 2,6-diisocyanatocyclohexane and their use as binders for glass fiber sizings
CA 2198567 A1 · Owner: Audenaert, Raymond · Inventors: Reiff, Helmut; Meier-Westhues, Hans-Ulrich; Audenaert, Raymond
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 aqueous polyurethane dispersions having a resinsolids content of 20 to 60 wt % a viscosity at 23 °C of 10 to 20,000 mPa~s and a pH of 5.5 to 8.5, wherein the polyurethane has a weight average molecular weightof 5,000 to 500,000 and a urethane group content (calculated as -NHCO-Omolecular weight = 59) of 2.5 to 15 wt % and is based on a polyisocyanate, component containing 50 to 100 wt % of 1-methyl-2,4- and/or -2,6-diisocyanatocyclohexane. The present invention also relates to aqueous binder compositions containing these aqueous polyurethane dispersions and known crosslinking resins and to the use ofthe aqueous polyurethane dispersions and aqueous binder …
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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 February 26, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 26, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 26, 2019.
- 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.