Extrusion coating method with polyolefin foam
CA 1088383 A · Owner: Sumitomo Chemical Co. Ltd. · Inventors: Sakakura, Kazuaki; Takahashi, Nobuyuki; Adachi, Takayoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A procedure is disclosed for continuous extrusion coating by the use of a coating die of a hollow core material with a highly expanded polyolefin composition containing a volatile organic liquid blowing agent the improvement, comprising externally cooling the outer surface of the extruded molten mass of expandable polyolefin resin, at the point at which the molten mass begins to foam, by by contacting the surface with a cooling gas or water to allow the pressure of foaming to be exerted inwardly and also to cause the growth of foam to proceed in the direction of the internal core for thereby enabling the polyolefin foam to adhere fast to the hollow core and giving rise to a coating having a …
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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 October 28, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 28, 1997.
- 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.