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:
Jan. 13, 2009
Filed:
Jun. 10, 2005
Applicant:
Leslie M. Blair, Parkersburg, WV (US);
Inventor:
Leslie M. Blair, Parkersburg, WV (US);
Assignee:
E.I. Du Pont de Nemours, Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 10/00 (2006.01); C08G 10/02 (2006.01); C08G 2/00 (2006.01); C08G 2/06 (2006.01); C08G 2/08 (2006.01);
U.S. Cl.
CPC ...
Abstract
A process for the polymerization of formaldehyde, comprising contacting formaldehyde in a hydrocarbon solution with an aliphatic anhydride and a quaternary ammonium salt polymerization initiator of the formula:RRRRNXwhere Ris an aliphatic or olefinic hydrocarbon group containing about 18 to about 25 carbon atoms; R, R, and Rare each methyl, ethyl, and/or propyl, such that the total number of carbon atoms in R, R, and Rcombined is between 3 and 7; and Xis an organic anion.