Two-constituent polyurethane composition having high early strength
CA 2473437 A1 · Owner: Sika Technology Ag · Inventors: Burckhardt, Urs; Stadelmann, Ursula; Konstanzer, Martin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a two-constituent composition wherein the first , constituent (A) contains at least one polyurethane prepolymer which has isocyanate end groups and is produced from at least one aromatic polyisocyanate and at least one polyol and at least one polyaldimine which , can be obtained from at least one polyamine having aliphatic primary amino groups and at least one aldehyde which in position .alpha. in relation to the carbonyl group, does not have any C-H groups. The second constituent (B) contains water which is bound to a carrier material. The inventive composition is characterised in that it exhibits a high early strength and hardens , quickly, thus not forming …
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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 January 17, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 17, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 17, 2025.
- 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.