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:
Dec. 19, 1995
Filed:
Sep. 02, 1994
Applicant:
Inventors:
Assignee:
The Dow Chemical Company, Midland, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07F / ; C08K / ; C08K / ; C08K / ;
U.S. Cl.
CPC ...
524123 ; 524125 ; 524127 ; 524154 ; 558160 ; 558162 ; 558165 ; 558274 ; 556404 ; 560 86 ;
Abstract
The diposphines have the formula (I) ##STR1## wherein: R.sup.2, R.sup.3 and R.sup.4 independently from each other represent a hydrocarbyl group which is substituted with one or more radicals selected from the group consisting of halogen, alkyl and alkoxy, and A is --C(O)--, --S(O).sub.2 --, --S(O)-- or certain divalent organic groups. The diphosphines are useful for stabilizing thermoplastic polymers, such as polycarbonates, against thermal discoloration.