Catalysts for preparing polyisocyanates containing isocyanurate groups, and their use
CA 2413642 A1 · Owner: Kohlstruk, Stephan · Inventors: Windmuller, Manuela; Poersch, Waltraud; Kohlstruk, Stephan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a novel compound of the formula: (wherein n = m + 1; 1 >= m/n > 0; 1 >= 0; p > 0; r > 0; q = 1 or 2; R is aliphatic, cycloaliphatic, aryl aralkyl or, alkylaryl radical having up to 16 C atoms or two R groups are linked together via an alkylene bridge; R1 is R Si(R)3, or -CO-NR-R3; R2 is H or R or R1 and R2 may be linked via an alkylene bridge; R3 is R or Si(R)3; and X~ is an onium cation (R4)4E~ in which E is N or P; and R4 is aliphatic cycloaliphatic, araliphatic or aryl radical having up to 20 carbon atoms), which is useful as a catalyst in a process for preparing a polyisocyanate containing an isocyanurate group.
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 December 5, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 5, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 5, 2024.
- 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.