Regioselectively substituted cellulose esters produced in a tetraalkylammonium alkylphosphate ionic liquid process and products produced therefrom

Patent metadata

Field	Value
Publication number	US-9926384-B2
Application number	US-201414447704-A
Country	US
Kind code	B2
Filing date	Jul 31, 2014
Priority date	Apr 15, 2009
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

This invention relates a cellulose solution comprising cellulose and at least one tetraalkylammonium alkylphosphate and processes to produce the cellulose solution. Another aspect of this invention relates to shaped articles prepared from a cellulose solution comprising cellulose and at least one tetraalkylammonium alkylphosphate. Another embodiment of this invention relates to compositions comprising derivatives of cellulose prepared from a cellulose solution comprising at least one tetraalkylammonium alkylphosphate. Another embodiment of this invention relates to compositions comprising regioselectively substituted cellulose esters prepared from a cellulose solution comprising cellulose and at least one tetraalkylammonium alkylphosphate. In another embodiment of the invention, the cellulose esters of the present invention are used as protective and compensation films for liquid crystalline displays.

First claim

That which is claimed is:

1. A cellulose ester comprising:
(a) at least one aliphatic acyl substituent;
(b) at least one aromatic acyl substituent; and
(c) a degree of substitution from 1.8 to 2.9, and
wherein said cellulose ester is regioselectively substituted, the ring RDS ratio of said aliphatic acyl substituent for C6/C3 or C6/C2 is at least 1.05, and the carbonyl RDS at C2 and C3 for said aromatic acyl substituent is greater than at C6.

2. The cellulose ester of claim 1 , wherein said cellulose ester has a RDS ratio of C6>C3>C2.

3. The cellulose ester of claim 1 , wherein said cellulose ester has a RDS ratio of C6>C2>C3.

4. The cellulose ester of claim 1 , wherein said at least one aliphatic acyl substituent comprises acetate, propionate, or a combination thereof.

5. The cellulose ester of claim 1 , wherein said at least one aromatic acyl substituent comprises a benzoate.

6. The cellulose ester of claim 1 , wherein said cellulose ester has a degree of polymerization in the range of 5 to 1,000.

7. A film comprising a regioselectively substituted cellulose ester, wherein said regioselectively substituted cellulose ester comprises:
(a) at least one aliphatic acyl substituent;
(b) at least one aromatic acyl substituent; and
(c) a degree of substitution from 1.8 to 2.9,
wherein the ring RDS ratio of said aliphatic acyl substituent for C6/C3 or C6/C2 is at least 1.05 and the carbonyl RDS at C2 and C3 for said aromatic acyl substituent is greater than at C6.

8. The film of claim 7 , wherein said cellulose ester has a RDS ratio of C6>C3>C2.

9. The film of claim 7 , wherein said cellulose ester has a RDS ratio of C6>C2>C3.

10. The film of claim 7 , wherein said at least one aliphatic acyl substituent comprises acetate, propionate, or a combination thereof.

11. The film of claim 7 , wherein said at least one aromatic acyl substituent comprises a benzoate.

12. The film of claim 7 , wherein said film comprises a compensation film.

13. The film of claim 12 , wherein said compensation film comprises a +C plate, a −C plate, a +A plate, or −A plate.

14. The film of claim 7 , wherein said film has an Rth in the range of −400 to +100 nm.

15. The film of claim 7 , wherein said film has an Rth in the range of −160 to +270 nm.

16. The film of claim 7 , wherein said film has an Rth in the range of −60 to +100 nm.

Assignees

• Eastman Chem Co

Inventors

• Buchanan Charles
• Buchanan Norma
• Guzman-Morales Elizabeth

Classifications

• C08B3/08

  of monobasic organic acids with three or more carbon atoms, {e.g. propionate or butyrate} · CPC title

• C08B3/04

  Cellulose formate · CPC title

• C08B3/16 Primary

  Preparation of mixed organic cellulose esters {, e.g. cellulose aceto-formate or cellulose aceto-propionate} · CPC title

• C08B3/10

  with five or more carbon-atoms, {e.g. valerate} · CPC title

• G02B1/14

  Protective coatings, e.g. hard coatings · CPC title