Transparent substrate

A manufacturing method of a transparent substrate comprising:

• an oxidation process in which cellulose is oxidized in water with 2,2,6,6-tetramethyl-1-piperidine-N-oxyl or its derivative as a catalyst under the presence of a co-oxidant to obtain oxidized cellulose;
• a fiberizing process in which said oxidized cellulose is fiberized in water to obtain a cellulose fiber;
• and
• a preparation process using a volatile base of ammonia with which said cellulose fiber is combined with a polymer having a plurality of functional groups in a single molecule wherein said functional groups are at least one selected from an oxazoline group and an isocyanate group;
• and
• a substrate-forming process in which a transparent substrate is formed using a cellulose dispersion liquid which contains the cellulose fiber, wherein said cellulose dispersion liquid is prepared by blending said cellulose fiber with said polymer at a pH in the range of 3 to 6 in said preparation process using the volatile base of ammonia.