The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 28, 1989
Filed:
Mar. 30, 1988
Applicant:
Inventors:
Ramanathan Ravichandran, Yonkers, NY (US);
John D Spivack, Spring Valley, NY (US);
Assignee:
Ciba-Geigy Corporation, Ardsley, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08K / ; C07F / ;
U.S. Cl.
CPC ...
524 99 ; 546 25 ; 25240021 ;
Abstract
Dibenzodioxaphosphepin and dibenzodioxaphosphocin derivatives are prepared by reacting selected 2,2'-biphenols with phosphorus trichloride in an organic solvent and then reacting the intermediate formed with a 1,4-dihydroxy-2,2,6,6-tetraalkylpiperidine. The phosphites formed are useful as stabilizers of organic polymers and lubricating oils, especially as process stabilizers for polyolefins, elastomers, polyesters and polycarbonates.