Adhesive compositions with zwitterionic tackifiers and plasticizers
CA 2194752 A1 · Owner: Rayner, Terry J. · Inventors: Li, Kai; Rayner, Terry J.; Nielsen, Kent E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to adhesive compositions preferably those for pressure-sensitive adhesive tapes comprising an adhesive polymer and, as tackifier or plasticizer, a zwitterionic compound. The zwitterionic compounds include those of formula I, ( see fig. 1) wherein, R1, R2 and R3 are each alkyl, hydroxyalkyl aminoalkyl or aryl which may be interrupted in the alkyl chain by one or more oxygen atoms, R4 is H or OH Z~ is CO2~ or SO3~, x and y are each 0 1 or 2 provided that the sum of, x and y is less than or equal to 4.
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 January 9, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 9, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 9, 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.