Manufacturing method of release paper
CA 1263905 C · Owner: Ohara, Shuzo · Inventors: Kitamura, Ryoichi; Ohara, Shuzo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a method of manufacturing a release paper characterized in that a mixture of polyolefin and a silicone release agent compatible therewith comprising a reaction product of polymethyl hydrogen siloxane, vinyl group-containing poly-dimethyl siloxane and at least one olefin or polyolefin having one or more double-bonds is extruded onto a substrate of paper, fabric, film etc; the laminate is heat treated to cause the release agent contained in the mixed layer of the laminate to bleed onto the surface of the mixed layer to be thus localized and the localized release agent is fixed by curing. The resultant release agent's compatibility with polyolefin, film forming …
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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 December 19, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 19, 2006.
- 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.