Title: Cyclic phosphonite stabilized cellulose ester compositions

Abstract: This invention is directed to a new thermal stabilizer system for cellulose esters and their commercially useful formulated compositions which can be molded, shaped and otherwise processed in a thermoplastic condition at elevated temperatures to provide products having (1) better molecular weight retention and (2) less discoloration after thermal processing when compared to similar cellulose ester compositions containing prior art stabilizers.

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Inventors: Kuo, Chung-Ming (Kingsport, TN, US)
Wang, Richard H. S. (Kingsport, TN, US)
Bogan, Richard T. (Kingsport, TN, US)

Application Number: 830296
Filing Date: 1977-09-02
Publication_date: 1979-01-30
Assignee: Eastman Kodak Company (Rochester, NY)
Primary Class(es): 523/448 264/200, 264/330, 524/39, 524/41, 524/149
Other Classes:
US Patent Ref:

3014956	Dec, 1961	Birum	260/45.
3702878	Nov, 1972	Saito	260/936.

Other Refs: 162275553350

Mar, 1955	AU
Feb, 1958	CA

Primary Examiner: Woodberry, Edward M.
Assistant Examiner:
Attorney: Tootle; Clyde L., Reece, III; Daniel B.