Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2002-04-26
2004-07-13
Hightower, P. Hampton (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C528S170000, C528S183000, C528S184000, C528S189000, C528S196000, C528S206000, C528S208000, C528S310000, C528S342000, C548S227000, C548S577000, C525S411000
Reexamination Certificate
active
06762277
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention pertains to a method of manufacturing N-carboxyamino acid and polyamino acid.
2. Description of the Background Art
In recent years, the application of polyamino acids as functional high polymers for fiber materials, liquid crystal materials, optically active materials, and biocompatible materials, for example, in various fields has been anticipated.
As a method of manufacturing these polyamino acids, condensation polymerization of N-carboxyamino acid anhydride (NCA) is commonly known.
N-carboxyamino acid is normally obtained from the reaction of &agr;-amino acid with carbonyl chloride. A problem exists concerning handling of toxic carbonyl chloride. Another problem is difficulty in processing hydrogen chloride gas produced during the reaction process.
The present invention has been completed as a result of extensive research on the synthesis of N-carboxyamino acid anhydride with an object of providing a new method for manufacturing N-carboxyamino acid anhydride using a simple processing operation.
Another object of the present invention is to provide a method for manufacturing polyamino acid using a simple processing operation.
SUMMARY OF THE INVENTION
The method of manufacturing N-carboxyamino acid anhydride of the present invention comprises reacting &agr;-amino acid with di-tert-butyltricarbonate.
The method of manufacturing polyamino acid of the present invention comprises decarboxylating the N-carboxyamino acid anhydride obtained by reacting &agr;-amino acid with di-tert-butyltricarbonate.
Other objects, features and advantages of the invention will hereinafter become more readily apparent from the following description.
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Reflections, JBC Centennial 1905-2005 100 Years of Biochemistry and Molecular Biology, “From Proteins and Protein Models to Their Use in Immunology and Immunotherapy”, published JBC Papers in Press, Sep. 17, 2003, pp. 48507-48519, Michael Sela.
Endoh Takeshi
Kudoh Hiroto
Hampton Hightower P.
JSR Corporation
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