Use of polyisocyanates containing ester groups as hot melt adhesive or for the preparation of a hot melt adhesive
CA 2048989 A1 · Owner: Ganster, Otto · Inventors: Ganster, Otto; Konigshofen, Heinrich; Nachtkamp, Klaus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mo-3627, LeA 27,855, THE USE OF POLYISOCYANATES CONTAINING ESTER GROUPS AS HOT MELT ADHESIVE OR FOR THE PREPARATION OF A HOT MELT ADHESIVE ABSTRACT OF THE INVENTION, Disclosed herein is a process for bonding substrates comprising applying a hot-melt adhesive to the surface of at least one of the substrates and contacting the surface of said substrate with the surface of the other substrate said, adhesive containing an ester group-containing polyisocyanate which is a solid below 30°C and liquid above 100°C corresponding to formula (I), A(OCO-B-NCO)n (I) in which, n stands for a whole number or a fraction (statistical average) of from 2 to 6, A stands for an n-valent organic group such as is …
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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 August 12, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 12, 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
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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.