US 8,524,887 B2 · Regioselectively substituted cellulose esters produced in a tetraalkylammonium alkylphosphate ionic liquid process and products produced therefrom

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.

Claims33

Dependent claims

A process for producing cellulose esters, said process comprising:

a) contacting cellulose with at least one tetraalkylammonium alkylphosphate to form a cellulose solution;
b) contacting said cellulose solution with at least one acylating reagent at a contact temperature and contact time sufficient to produce an acylated cellulose solution comprising at least one cellulose ester;
c) contacting said acylated cellulose solution with at least one non-solvent to cause said cellulose ester to precipitate to produce a cellulose ester slurry comprising precipitated cellulose ester and said tetraalkylammonium alkylphosphate;
and
d) separating at least a portion of said precipitated cellulose ester from said cellulose ester slurry to produce a recovered cellulose ester and precipitation liquids comprising said tetraalkylammonium alkylphosphate.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

12/539,817Filed 12 Aug 2009 · us provisional application

Priority

15 Apr 2009

Published

US 2010/0267942 A121 Oct 2010

Granted

3 Sep 2013

Term ends

Not estimatedThe source records don’t support an estimate.

Classification13 codes

C08B 3/16
Preparation of cellulose esters of organic acids: preparation of mixed organic cellulose esters , e.g. cellulose aceto-formate or cellulose…
C08B 1/003
Preparatory treatment of cellulose for making derivatives thereof , e.g. pre-treatment, pre-soaking, activation: preparation of cellulose…
C08B 3/00
Preparation of cellulose esters of organic acids
C08B 3/04
Preparation of cellulose esters of organic acids: cellulose formate

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

Life of this patent

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

Life of this patent

Abstract

Claims33