Process for preparing a polyisocyanurate polyurethane material
CA 2523481 C · Owner: Bleys, Gerhard Jozef · Inventors: Leenslag, Jan Willem; Verbeke, Hans Godelieve Guido; Bleys, Gerhard Jozef
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing a polyisocyanurate polyurethane material comprising , reacting a , polyisocyanate and an isocyanate-reactive composition. The reaction is conducted at an , isocyanate index of 150 to 1500 and in the presence of a trimerisation catalyst. The , polyisocyanate consists of a) 80-100% by weight of diphenylmethane diisocyanate , comprising at least 40% by weight of 4,4'-diphenylmethane diisocyanate and/or a variant of , said diphenylmethane diisocyanate which variant is liquid at 25°C and has an NCO value , of at least 20% by weight (polyisocyanate a); and b) 20-0% by weight of another , polyisocyanate (polyisocyanate b). The isocyanate-reactive composition consists …
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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 May 24, 2004 and granted May 1, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 24, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 24, 2026.
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