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US 11,447,612 B2Granted
Sheet
AssigneeOji Holdings Corporation
InventorsKoh Sakai, Hayato Fushimi, Hirokazu Sunagawa
Life of this patent
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Abstract
The purpose of the present invention is to provide a composite sheet in which the dimension stability when it is tensed is high and the appearance deterioration and the yellowness change are suppressed. The present invention relates to a sheet comprising; cellulose fibers having a fiber width of 1000 nm or less and having a phosphoric acid group or a phosphoric acid group-derived substituent; and a polyvinyl alcohol-based resin, wherein the sheet has a tensile elastic modulus of 3.4 GPa or more.
Claims6
A sheet comprising:
- cellulose fibers having a fiber width of 2 to 50 nm and having a phosphoric acid group or a phosphoric acid group-derived substituent;
- and
- a polyvinyl alcohol-based resin,
- wherein the sheet has a tensile elastic modulus of 4.0 GPa or more,
- the average degree of polymerization of the polyvinyl alcohol-based resin is 300 to 2200,
- the saponification degree of the polyvinyl alcohol is 50 mol % or more,
- the content of the cellulose fibers is 10% by mass or more with respect to the total mass of the sheet, and
- the sheet is made from a suspension which contains the cellulose fibers and the polyvinyl alcohol-based resin.
5 more elements
Dependencies are inferred from the claim text.