Synthetic resins or natural rubbers -- part of the class 520 ser – Antistatic compositions – Contains metal – boron – phosphorus – or silicon
Reexamination Certificate
2007-12-18
2007-12-18
Zucker, Paul A. (Department: 1621)
Synthetic resins or natural rubbers -- part of the class 520 ser
Antistatic compositions
Contains metal, boron, phosphorus, or silicon
Reexamination Certificate
active
11674373
ABSTRACT:
A method for preparing a thermoplastic composition containing an antistatic agent is described. The antistatic agent is a phosphonium sulfonate salt of generic formula (1)wherein each X is independently a halogen or hydrogen, provided that the molar ratio of halogen to hydrogen is greater than about 0.90; p is 0 or 1 and q and r are integers of 0 to about 7 provided that q+r is less than 8 and that if p is not zero then r is greater than zero; and each R is the same or different hydrocarbon radical containing 1 to about 18 carbon atoms. The phosphonium sulfonate salt is prepared by a method that includes combining in an aqueous medium a compound of generic formula (2)wherein M is Li or Na, and X, q, p, and r are as defined above, with a stoichiometric excess of a compound of the generic formula (3)in-line-formulae description="In-line Formulae" end="lead"?(R)4P-Z (3)in-line-formulae description="In-line Formulae" end="tail"?wherein Z is a halogen and R is as defined above; and separating the product of formula (1) from the medium. The phosphonium sulfonate salt is then combined with a thermoplastic resin.
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Hoeks Theodorus Lambertus
Leenders Chiel Albertus
van de Grampel Robert Dirk
General Electric Company
Zucker Paul A.
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