Cellulose acylate film and producing method thereof
AssigneeFuji Photo Film Co., Ltd.
InventorMasaru Sugiura
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Abstract
In a multi-layer structure of a cellulose acylate film, the averaged degree of acylation of surface layers is controlled in the range of 0.5 to 2.8 by mixing several sorts of cellulose acylates having different averaged degrees of acyation. One of the surface layers is formed on a substrate by casting a solution containing cellulose acylate made of cotton linter. Lubricant particles are added to a solution for the surface layers, and emission compounds to a solution for the inner layers. The obtained cellulose acylate film is excellent in adhesive property to the hydrophobic material without saponification, and adequately used for the polarizing filter, an optical compensation sheet, and liquid crystal display.
Claims36
A cellulose acylate film comprising:
- plural layers including two surface layers and at least one inner layer;
- wherein the averaged degree of acylation of cellulose acylate in said two surface layers is in the range of 0.5 to 2.8 and the averaged degree of acylation of cellulose acylate in said inner layer is higher than that of said two surface layers.
A cellulose acylate film to be laminated on a hydrophilic material, comprising:
- plural layers in which the averaged degree of a acylation of cellulose acylate is different;
- a surface layer of said plural layers that is to be laminated on said hydrophilic material, the averaged degree of acylation of cellulose acylate in said surface layer being in the range of 0.5 to 2.8;
- and
- wherein said averaged degree of acylation of cellulose acylate in each layer is adjusted by mixing plural cellulose acylates having different averaged degree of acylation.
A cellulose acylate film to be laminated on a hydrophilic material, comprising:
- plural layers including at least a first layer and a second layer, said first layer having a first surface to be stacked on said hydrophilic material and a second surface on said second layer;
- wherein the averaged degree of acylation of cellulose acylate in said first layer is in the range of 0.5 to 2.8, and the averaged degree of acylation of that in said second layer is different from that of said first layer.
A producing method of a cellulose acylate film to be laminated on a hydrophilic material, said producing method comprising:
- preparing plural solutions which include at least a first solution and a second solution, in said first solution a first material whose averaged degree of acylation is in the range of 0.5 to 2.8 being dissolved to a solvent, in said second solution a second material whose averaged degree of acylation is different from said first material being dissolved to a solvent, said averaged degrees of acylation of said first and second materials being adjusted by mixing plural cellulose acylates whose averaged degrees of acylation are different;
- casting said plural solutions on a substrate to form said cellulose acylate film having plural layers in which a second layer is formed on a first layer, said first layer to be contacted to said hydrophilic material being formed over said first solution, said second layer being formed of said second solution;
- and
- peeling said cellulose acylate film from said substrate.
Dependencies are inferred from the claim text.