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Expired Canadian patentCanada

Heat shrinkable laminate of low density copolymer of ethylene and c -to c-- olefin

CA 1291311 C · Owner: Showa Denko Kabushiki Kaisha · Inventors: Ohkubo, Takuo; Shishido, Kihachi; Taka, Toshio

CIPO record

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Abstract From the Canadian patent

The present invention provides a low temperature heat shrinkable film comprising a linear low density polyethylene resin having a short branched chain and a density of 0.935 g/cm3, and whose film properties are such that the haze value is 5% or less the heat, shrinkages at 90°C in the M and T directions are 30% or more and 5% or less, respectively , and the shrinkage stress at 90°C in the M direction is 300 g/mm2 or more. This transparent film having an excellent low temperature heat shrinkability can be produced by drawing a film of the above-mentioned polyethylene resin between two rolls having a diameter of 200 mm or less at an air gap of 10 mm or less at a draw ratio of 3.0 to 6Ø …

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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 29, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 29, 2008.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 16, 1985
GrantedOctober 29, 1991
Term endedOctober 29, 2008
Patent numberCA 1291311 C
Classification (IPC)B29C55/02 +1 more

Timeline

Timeline From CIPO dates

19861989199219951998200120042007Application filedDec 16, 1985Patent grantedOct 29, 1991Term endedOct 29, 2008

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.