RETARDATION FILM - SEKISUI CHEMICAL CO LTD

Title:

RETARDATION FILM

Document Type and Number:

WIPO Patent Application WO/2006/057309

Kind Code:

A1

Abstract:

A retardation film containing a norbornene copolymer. It is excellent in heat resistance and significantly reduced in specific gravity, birefringence, photoelasticity, and wavelength dispersion. It further has the high ability to compensate for retardation. The retardation film comprises a norbornene copolymer composition containing a norbornene copolymer comprising 40-60 mol% repeating units derived from at least one norbornene monomer selected from the group consisting of a monomer represented by the general formula (I), a monomer represented by the general formula (II), a monomer represented by the general formula (III), a monomer represented by the general formula (IV), and a monomer represented by the general formula (V) and 60-40 mol% repeating units derived from an acyclic olefin monomer. When the norbornene copolymer composition is formed into a film and then stretched in a stretch ratio of 2 while being heated at the glass transition temperature determined from dynamic viscoelasticity, then the stretched film has an in-plane birefringence &Dgr n defined by the following equation of 0.0033 or larger. &Dgr n = &Verbar nx-ny&Verbar

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Inventors:

HIRAIKE HIROSHI (JP)
SAWADA TAKAHIKO (JP)
YAGI KAZUNARI (JP)
HIGUCHI ISAO (JP)
TOYOSHIMA KATSUNORI (JP)
MORITA TAKEHARU (JP)
NOZATO SHOJI (JP)
TAKAENOKI YOSHIHIRO (JP)
NAKAMURA TAKEHIRO (JP)
HATKE WILFRIED (DE)
BRUCH MATTHIAS (DE)
SCHAUWIENOLD ANNE-MEIKE (DE)
STEHLING UDO MANFRED (DE)
KANAI HIROYUKI (JP)
SERIZAWA HAJIME (JP)

Application Number:

PCT/JP2005/021599

Publication Date:

June 01, 2006

Filing Date:

November 24, 2005

Export Citation:

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Assignee:

SEKISUI CHEMICAL CO LTD (JP)
HIRAIKE HIROSHI (JP)
SAWADA TAKAHIKO (JP)
YAGI KAZUNARI (JP)
HIGUCHI ISAO (JP)
TOYOSHIMA KATSUNORI (JP)
MORITA TAKEHARU (JP)
NOZATO SHOJI (JP)
TAKAENOKI YOSHIHIRO (JP)
NAKAMURA TAKEHIRO (JP)
HATKE WILFRIED (DE)
BRUCH MATTHIAS (DE)
SCHAUWIENOLD ANNE-MEIKE (DE)
STEHLING UDO MANFRED (DE)
KANAI HIROYUKI (JP)
SERIZAWA HAJIME (JP)

International Classes:

G02B5/30; C08F210/00; C08F232/08; C08L45/00

Domestic Patent References:

WO2006030797A1

2006-03-23

Foreign References:

JPH0875921A	1996-03-22
JP2001194532A	2001-07-19
JP2003327618A	2003-11-19

Other References: