Pressure sensitive adhesive and process
CA 1109585 A · Owner: Johnson & Johnson · Inventors: Bemmels, Cyrus W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
of Disclosure -- A water based rubber resin pressure-sensitive adhesive produced by mixing a high solids resin solution on with an isoprene containing latex together with a small amount of carboxylation at a pH of at least about 8. The tackifier resin is added to rubber latex in a high solids resin solution in an organic solvent. Preferably this solution contains a small amount of a polar solvent such as isopropyl alcohol. The carboxylation may be derived either from using a carboxylated latex or from using a carboxylated resin in the resin solution, or a combination of both of these. The resin solution is dispersed in the water system of the latex in a finely divided state. This preferably …
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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
- Granted September 22, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 22, 1998.
- 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.