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Transparent Substrate

Inactive Publication Date: 2013-07-18
TOPPAN PRINTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a transparent substrate made from a natural material that has low linear expansion, high light transmission, appropriate moisture permeability, and is robust and water-resistant with consistent characteristics. The substrate is made by oxidizing a polysaccharide and reacting it to cross-link molecules. Overall, this invention provides a useful and high-quality transparent substrate made from natural materials that have improved performance characteristics.

Problems solved by technology

In the case where the formed articles manufactured by a conventional forming method is employed in a practical product, however, there are problems of insufficient transparency, discoloration by heat, low water resistance that causes swelling with water when immersed or dipped in water, dimensional instability when left in an air because of moisture absorption, and large variations in physical properties due to water absorption.
The formed article manufactured by a conventional forming method lacks sufficient stability for use as a transparent substrate.
In particular, the formed article has not had sufficient durability to be used as a transparent substrate of a protection film for a polarizing plate etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0093]Examples of the present invention are described below. These are only examples, and therefore, the present invention is not limited to these.

preparation example

[0094]TEMPO oxidation of cellulose is carried out according to the following procedure.

Chemicals and Materials

[0095]Natural cellulose: bleached kraft pulp (“Mackenzie”, I-type crystalline, Fletcher Challenge Canada Ltd.).[0096]TEMPO: commercial item (98%, Tokyo Chemical Industry Co., Ltd.).[0097]Sodium hypochlorite: commercial item (Cl: 5%, Wako Pure Chemical Industries, Ltd.).[0098]Sodium chlorite: commercial item (79%, Kanto Chemical Co., Inc.).[0099]Sodium bromide: commercial item (Wako Pure Chemical Industries, Ltd.).

TEMPO Oxidation Treatment of Cellulose

[0100]10 g (dry weight) of the bleached kraft pulp was statically immersed in 500 ml of ion-exchange water in a 2 L-glass beaker and left over night to swell with water. After this was kept at 20° C. with a temperature-controlled water bath, 0.1 g of TEMPO and 1 g of sodium bromide were added under stirring so that pulp slurry was obtained. Subsequently, 5 mmol of sodium hypochlorite with respect to 1 g of cellulose was added t...

examples 1-4

[0113]The cellulose dispersion liquid obtained in in the section of > was casted on a polystyrene plate and dried at 50° C. in an oven for 24 hours to form films having a thickness of 20 μm (in example 1), 40 μm (in example 2), 60 μm (in example 3) and 250 μm (in example 4).

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Abstract

The present invention provides a formed article, or more specifically a transparent substrate, which effectively utilizes a natural stuff and which has a low linear expansion coefficient, a high light transmittance and an appropriate level of moisture permeability. The transparent substrate includes at least an oxidized polysaccharide and has a linear expansion coefficient of 50 ppm / ° C. or less at 30-150° C. and a light transmittance of 70% or more at 660 nm. Its manufacturing method includes an oxidation process in which cellulose reacts with TEMPO or its derivatives as a catalyst to be oxidized in water under the presence of a co-oxidant, along with a fiberizing process in which the oxidized cellulose is fiberized in water to form a cellulose fiber, and a substrate-forming process in which a transparent substrate is formed from a cellulose dispersion liquid containing the cellulose fiber.

Description

[0001]This application is a continuation of International Application No. PCT / JP2011 / 069009, filed Aug. 24, 2011, which is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a transparent substrate which includes a natural stuff. More specifically, the present invention relates to a transparent substrate which includes a cellulose fiber having a substituted group.[0004]2. Description of the Related Art[0005]In recent years, much research has been conducted on natural stuffs available for use as a transparent substrate as an alternative to a triacetyl cellulose (TAC) film. While it has been, for example, found that it is possible to make remarkably fine cellulose nanofibers from cellulose fibers by a chemical and / or mechanical treatment, it has further been found that a formed article having robustness and a low linear expansion coefficient can be obtained from a composite material in which...

Claims

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Application Information

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IPC IPC(8): C09D101/08
CPCC08L1/04G02B1/105G02B5/3033C09D101/08C08B15/02C08G18/797C08L1/10C08K5/523C08K5/005C08L51/06C08J5/18C08J2301/04G02B1/18G02B1/14C08B15/04C08B15/06C08L1/08G02B5/30
Inventor SHIMIZU, KOSUKEOOMORI, YUMIKOTANI, MIZUHIROSAIKI, AKIKO
Owner TOPPAN PRINTING CO LTD
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