JP2005301225A5

JP2005301225A5 -

Info

Publication number: JP2005301225A5
Application number: JP2005015791A
Authority: JP
Filing date: 2005-01-24
Publication date: 2008-01-10
Anticipated expiration: 2025-01-24

Description

（１２）２を越え５０以下の縦／横比のセルロースアシレートフィルムの製造方法であって、１．０５倍〜３．０倍に縦延伸する工程を含むセルロースアシレートフィルムの製造方法。
（１３）前記縦延伸を、延伸ゾーンの外側に設置された２対以上のニップロールを用いて行うことを特徴とする上記（１２）に記載のセルロースアシレートフィルムの製造方法。
（１４）前記縦延伸をテンターにより行う上記（１２）に記載のセルロースアシレートフィルムの製造方法。
（１５）前記延伸は、熱処理ゾーンの中を非接触で搬送されながら縦延伸する上記（１２）〜（１４）のいずれかに記載のセルロースアシレートフィルムの製造方法。
（１６）前記延伸は、熱処理ゾーンの中を非接触で搬送されながら縦延伸する上記（１２）〜（１５）のいずれかに記載のセルロースアシレートフィルムの製造方法。
(12) A method for producing a cellulose acylate film having an aspect ratio / width ratio of more than 2 and 50 or less, comprising a step of longitudinally stretching 1.05 times to 3.0 times .
(13) The method for producing a cellulose acylate film according to (12), wherein the longitudinal stretching is performed using two or more pairs of nip rolls installed outside the stretching zone.
(14) The method for producing a cellulose acylate film according to (12), wherein the longitudinal stretching is performed with a tenter.
(15) The method for producing a cellulose acylate film according to any one of (12) to (14), wherein the stretching is longitudinal stretching while being conveyed in the heat treatment zone in a non-contact manner.
(16) The method for producing a cellulose acylate film according to any one of (12) to (15), wherein the stretching is longitudinal stretching while being conveyed in a non-contact manner in the heat treatment zone.

Claims

A cellulose acylate film having an adhesion mark of 10 points / m ² or less, an in-plane retardation value (Re value) of 0 to 200 nm, and a thickness direction retardation value (Rth value) of 30 to 500 nm.

2. The cellulose acylate film according to claim 1, wherein both the Re value and the Rth value have a variation rate of 5% or less in the width direction and the longitudinal direction.

The cellulose acylate film according to claim 1 or 2, wherein the acylate group of the cellulose acylate film satisfies a substitution degree of the following formulas (3) and (4).
Formula (3) 2.5 <= A + B <3.0
Formula (4) 1.25 ≦ B <3
(In the formulas (3) and (4), A represents the degree of substitution of the acetyl group, and B represents the total degree of substitution of the propionyl group, butyryl group, pentanoyl group, and hexanoyl group.)

The cellulose acylate film according to any one of claims 1 to 3, which has been stretched by 1.05 to 2.5 times.

The cellulose acylate film according to any one of claims 1 to 4, wherein a longitudinal stretch / lateral stretch ratio is 0.05 to 0.5.

The cellulose acylate film according to any one of claims 1 to 4, wherein a longitudinal stretch / lateral stretch ratio is 2 to 20.

A method for producing a cellulose acylate film having an aspect ratio exceeding 2 and not more than 50, comprising a step of longitudinally stretching 1.05 to 3 times .

The method for producing a cellulose acylate film according to claim 7, wherein the stretching is performed using two or more pairs of nip rolls installed outside the stretching zone.

The method for producing a cellulose acylate film according to claim 7, wherein the stretching is performed with a tenter.

An unstretched film manufacturing process for manufacturing an unstretched film using a cellulose acylate resin, and while heating the unstretched film in the stretch zone, the film width (W) of the unstretched film is increased outside the stretch zone. Longitudinal stretching that longitudinally stretches 1.05 to 3 times using nip rolls arranged so that the distance (L) between two pairs of nip rolls is greater than 2 and has an aspect ratio (L / W ratio) of 50 or less. The manufacturing method of the cellulose acylate film including a process.

The manufacturing method of the cellulose acylate film according to claim 10, wherein the unstretched film has a width of 1 m to 5 m.

The method for producing a cellulose acylate film according to claim 10 or 11, wherein the temperature of the nip roll is (Tg-150) ° C or higher and lower than (Tg) ° C.

The method for producing a cellulose acylate film according to any one of claims 7 to 12, wherein an acylate group of the cellulose acylate film satisfies a substitution degree of the following formulas (3) and (4).
Formula (3) 2.5 <= A + B <3.0
Formula (4) 1.25 ≦ B <3
(In the formulas (3) and (4), A represents the degree of substitution of the acetyl group, and B represents the total degree of substitution of the propionyl group, butyryl group, pentanoyl group, and hexanoyl group.)

A cellulose acylate film production apparatus for producing a cellulose acylate film obtained by longitudinally stretching an unstretched cellulose acylate film by 1.05 to 3.0 times,
A stretching zone for heating the unstretched cellulose acylate film;
Outside the stretching zone, the distance (L) between two pairs of nip rolls with respect to the film width (W) of the unstretched cellulose acylate film exceeds 2 and has an aspect ratio (L / W ratio) of 50 or less. An apparatus for producing a cellulose acylate film having nip rolls arranged in such a manner.