Novel moisture-crosslinking pu hot-melt adhesives
CA 2212598 A1 · Owner: Degussa-Huls Aktiengesellschaft · Inventors: Wolf, Elmar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a moisture-crosslinking polyurethane hot-melt adhesive which comprises a reaction product of: A) an NCO prepolymer having at least two NCO groups which are aliphatic, cycloaliphatic, (cyclo)aliphatic or aromatic NCO groups and having an NCO content of 1-23%; with B) a polyamine having at least two sterically hindered amino groups and being selected from the group consisting of: 1. a polyamine containing at least two 2,2,6,6-tetramethylpiperidine group of the formula:, (see fig. I) and 2. a polyamine of the formula:, (see fig. II) (wherein n is an integer of 3 to 6) in which 1-0.6 sterically hindered amino group reacts with one NCO group. The adhesive exhibits a very high …
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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 6, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 6, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 6, 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.