Cellulose acylate and solution thereof
AssigneeFuji Photo Film Co., Ltd.
InventorsTsukasa Yamada, Yasuo Mukunoki
Life of this patent
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Abstract
A cellulose acylate which is a polymer obtained by substituting cellulose with acyl groups in 2-, 3-, 6-positions. The total degree of acyl substitution in the 2- and 3-positions is regulated to from 1.70 to 1.90. The degree of 6-position acyl substitution is regulated to 0.88 or higher.
Claims12
A cellulose acylate in which substitution degrees of acyl groups at 2- and 3-positions are in the range of 1.70 to 1.90 in total and a substitution degree of acyl group at 6-position is 0.88 or more.
A cellulose acylate solution containing a cellulose acylate dissolved in an essentially non-chlorinated solvent, said cellulose acylate having substitution degrees of acyl groups at 2- and 3-positions in total in the range of 1.70 to 1.90 and a substitution degree of acyl group at 6-position in the range of 0.88 or more.
A process for preparation of cellulose acylate solution, in which a mixture of an essentially non-chlorinated solvent and a cellulose acylate having substitution degrees of acyl groups at 2- and 3-positions in total in the range of 1.70 to 1.90 and a substitution degree of acyl group at 6-position in the range of 0.88 or more is cooled to −80 to −10° C. or heated to 80 to 220° C., so that the cellulose acylate is dissolved in the solvent.
A cellulose acylate film made of a cellulose acylate in which substitution degrees of acyl groups at 2- and 3-positions are in the range of 1.70 to 1.90 in total and a substitution degree of acyl group at 6-position is 0.88 or more.
Dependencies are inferred from the claim text.