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US 5,292,877 AGranted
Cellulose acetoacetates
AssigneeEastman Kodak Company
InventorsKevin J. Edgar, William W. Blount, Jr.
Life of this patent
Estimating the term…
Abstract
Water soluble cellulose acetoacetates prepared by contacting a cellulose material with diketene, an alkyl acetoacetate, 2,2,6-trimethyl-4H-1,3-dioxin-4-one or a mixture thereof in a solvent system comprising lithium chloride plus a carboxamide. Compositions containing the cellulose acetoacetates and, optionally, a crosslinking agent are useful for coatings applications.
Claims21
A process for preparing cellulose acetoacetate, said process comprising contacting in any order the following:
- (i) a cellulose material,
- (ii) diketene, an alkyl acetoacetate, 2,2,6-trimethyl-4H-1,3-dioxin-4-one, or a mixture thereof,
- (iii) a solubilizing amount of a solvent system comprising lithium chloride plus a carboxamide selected from the group consisting of 1-methyl-2-pyrrolidinone, N,N dimethylacetamide, or a mixture thereof, and
- (iv) optionally, a catalytic amount of pyridine, NaOAc, Et.sub.3 N, amine, mineral acid, or alkali or alkaline earth metal salt
- under conditions to promote formation of the desired cellulose acetoacetate having a DS/AGU of 0.1 to about 2.9.
2 more elements
A water soluble cellulose acetoacetate having a DS/AGU of about 0.1 to about 2.9.
Dependencies are inferred from the claim text.