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:
Sep. 06, 1994
Filed:
Feb. 22, 1994
Thomas J Devon, Longview, TX (US);
Gerald W Phillips, Longview, TX (US);
Thomas A Puckette, Longview, TX (US);
Jerome L Stavinoha, Longview, TX (US);
Jeffrey J Vanderbilt, Longview, TX (US);
Eastman Chemical Company, Kingsport, TN (US);
Abstract
Disclosed are bis-phosphine compounds having the general formula ##STR1## wherein: each of A.sup.1, A.sup.2, A.sup.3 and A.sup.4 is an arylene radical wherein (i) each phosphorus atom P is bonded to a ring carbon atom of A.sup.1 and A.sup.2 and to a ring carbon atom of A.sup.3 and A.sup.4, (ii) A.sup.1 and A.sup.2, and A.sup.3 and A.sup.4 are bonded to each other by ring carbon atoms and (iii) each of the residues ##STR2## constitutes a 5-membered ring; each of A.sup.5 and A.sup.6 is an arylene radical wherein A.sup.5 and A.sup.6 are bonded to each other and to residues R.sup.1 --C--R.sup.2 and R.sup.3 --C--R.sup.4 by ring carbon atoms and R.sup.1 --C--R.sup.2 and R.sup.3 --C--R.sup.4 are connected to each other through a chain of 4 carbon atoms; and