Compounded latex saturants for porous backings
CA 2119600 A1 · Owner: Minnesota Mining And Manufacturing Company · Inventors: Schurb, Francis A.; Ellsworth, Arthur J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a novel latex saturant for porous backings and porous sheets, especially for paper backings used in pressure sensitive adhesive tapes. The saturant includes a latex an elastomer base compounded with both tackifying resin and filler. The elastomer base may be either an acrylate or a rubber, such as carboxylated styrene-butadiene rubber. Paper incorporating the saturant of the invention provides a backing that retains flexibility, tensile and elongation, and gives an improved drape or hand. Pressure sensitive adhesive tapes which employ the compounded saturated backing show good adhesion with aging.
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 March 22, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 22, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 22, 2016.
- 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.