Organic compounds -- part of the class 532-570 series – Organic compounds – Phosphorus acids or salts thereof
Reexamination Certificate
2005-11-07
2010-02-16
Price, Elvis O (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Phosphorus acids or salts thereof
Reexamination Certificate
active
07662991
ABSTRACT:
A beneficial method for the manufacture of amino polyalkylene phosphonic acids, under substantial absence of hydrohalogenic acid, is disclosed. The method, in essence, is based on reacting narrowly defined ratios of phosphorous acid, an amine and a formaldehyde in presence of a heterogeneous Broensted acid catalyst. The inventive method is capable of yielding economically and quality operational/capacity advantages, in particular significantly reduced one-step cycle duration under exclusion of corrosion disadvantages and also is environmentally friendly without requiring, in that respect, anything more than nominal capital expenditures.
REFERENCES:
patent: 3288846 (1966-11-01), Irani et al.
patent: 3458281 (1969-07-01), Demarcq
patent: 3459793 (1969-08-01), Shen et al.
patent: 3632311 (1972-01-01), Kovacs et al.
patent: 3974209 (1976-08-01), Mitchell
patent: 4160779 (1979-07-01), Maier
patent: 4409151 (1983-10-01), Redmore et al.
patent: 4657705 (1987-04-01), Miller et al.
patent: 5105047 (1992-04-01), Waller
patent: 5459249 (1995-10-01), Bergfeld et al.
patent: 5688994 (1997-11-01), Baysdon et al.
patent: 6194604 (2001-02-01), Ma et al.
patent: 6238637 (2001-05-01), Heise et al.
patent: 6440380 (2002-08-01), Heise et al.
patent: 6476256 (2002-11-01), Heise et al.
patent: 1342412 (1962-11-01), None
patent: 57075990 (1982-05-01), None
Moedritzer et al., The Direct Synthesis of Alpha-Aminomethyl-phosphonic Acids, Mannich-Type Reactions with Orthophosphorous Acid, Journal of Organic Chemistry, American Chemical Society, Easton, US, vol. 31, May 1966, pp. 1603-1607.
Tramontiti et al., Further Advances in the Chemistry of Mannich Bases, Tetrahedron, Elsevier Science Publishers, Amsterdam, NL, vol. 46, No. 6, 1990, pp. 1791-1837.
Notte Patrick P.
Van Bree Jan H. J.
Vanesse Isabelle Emmanuel
Husch Blackwell Sanders LLP
Price Elvis O
Thermphos Trading GmbH
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