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:
Jun. 06, 2006
Filed:
Nov. 07, 2003
Chuen-ing Tseng, Lawrenceville, NJ (US);
Leigh E. Walker, Macungie, PA (US);
Chuen-Ing Tseng, Lawrenceville, NJ (US);
Leigh E. Walker, Macungie, PA (US);
Lonza Inc., Annandale, NJ (US);
Abstract
This invention provides a method of preparing a quaternary ammonium hydroxide compound having the formula (NRRRR)OH, wherein Rand Rare independently C–Calkyl; Ris benzyl or a C–Calkyl or a C–Caryl-sutstituted alkyl; Ris a C–Calkyl. The method includes the step of reacting a quaternary ammonium compound having the formula (NRRRR)X, wherein R, R, R, and Rare as defined above and X is Br or Cl, with a metal hydroxide in an aminoalcohol solvent to yield the quaternary ammonium hydroxide. The reaction forms metal bromide and/or metal chloride as a byproduct. The metal byproducts and excess metal hydroxide (if any) can be removed by methods known in the art. According to one preferred embodiment, the reaction of the quaternary ammonium compound with the metal hydroxide is performed in an anhydrous environment (i.e., with no water present).