Title:
延伸フィルムおよびその製造方法
Document Type and Number:
Japanese Patent JP4489699
Kind Code:
B2
Abstract:
Provided are a film that has high rigidity and high heat resistance and good releasability from a roughened copper foil surface, which is subjected to surface oxidization or etching treatment with acid, such as a black oxidized copper foil surface and that is suitable as a release film for producing an MLB; and a process for producing the same. A drawn film having, as at least one outermost layer thereof, a layer (A) which comprises a copolymer that is made from 4-methyl-1-pentene and ethylene or an ±-olefin, except 4-methyl-1-penten, having 3 to 20 carbon atoms and that comprises 80% or more by mole of 4-methyl-1-pentene, the thermal coefficient of contraction of the film being 20% or more in the film-drawn direction, or the peel area of the film being 50% or more when the film, together with a copper foil surface subjected to roughening treatment, is subjected to heating and pressing treatment. This film is suitable for producing an MLB and has good releasability from a black oxidized copper foil surface.
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Inventors:
Shigetoshi Nishijima
Shinichi Imuta
Toshiyuki Hirose
Shinichi Imuta
Toshiyuki Hirose
Application Number:
JP2005504204A
Publication Date:
June 23, 2010
Filing Date:
March 26, 2004
Export Citation:
Assignee:
Mitsui Chemicals, Inc.
International Classes:
B32B27/32; B29C33/68; B29C55/04; B32B27/00; C08J5/18; H05K3/46; B29K55/00; B29L9/00
Domestic Patent References:
| JP2002225207A | 2002-08-14 | |||
| JP2002192673A | 2002-07-10 | |||
| JPS60206620A | 1985-10-18 | |||
| JP2001009890A | 2001-01-16 | |||
| JPH09234786A | 1997-09-09 | |||
| JPH06134948A | 1994-05-17 | |||
| JPH0373588A | 1991-03-28 |
Attorney, Agent or Firm:
Patent corporation ssinpat