Barrier layer composition for plastic bodies
CA 2255530 C · Owner: Muller, Hans-Jurgen · Inventors: Knobloch, Peter; Probst, Werner; Roth, Christoph
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention describes a barrier layer composition which is applied to at least one surface of a plastic body preferably a polyolefin hollow body, having the following composition:, (a) 35 to 75 % by weight of an epoxide-containing or halogen- and epoxide-containing metal oxide sol; (b) 20 to 60 % by weight of a fluorine- or sulfo-containing maleic acid hemi ester copolymer or a fluorine- or sulfo-containing maleic acid hemi amide copolymer having the general structural formula, (see fig. I) wherein M = vinyl monomer; X = oxygen, nitrogen; Y = -(CH2)n-SO3H, -(CH2)n-F, -(CF2)n-H; n = 2 to 12;, (c) 0.5 to 5 % by weight of a catalyst based on one or more tertiary amines.
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 December 7, 1998 and granted September 9, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 7, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 7, 2020.
- 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.