Diphosphines

Details Diphosphines Diphosphines

1994-09-02

1995-12-19

Hoke, Veronica P.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524125, 524127, 524154, 558160, 558162, 558165, 558274, 556404, 560 86, C07F 950, C08K 55333, C08K 5521, C08K 550

Patent

active

054768888

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.

REFERENCES:
patent: 3257460 (1966-06-01), Gordon et al.
patent: 3644530 (1972-02-01), Bloom et al.
patent: 4083803 (1978-04-01), Oswald et al.
patent: 4092288 (1978-05-01), Calkins et al.
patent: 4145525 (1979-03-01), Dixon et al.
patent: 4444978 (1984-04-01), Dick et al.
patent: 4474937 (1984-10-01), Bales
patent: 4627949 (1986-12-01), Dhein et al.
patent: 4835202 (1989-05-01), Pastor et al.
patent: 4962144 (1990-10-01), Babillis et al.
patent: 5128437 (1992-07-01), Westeppe et al.

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