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:
Nov. 04, 1980
Filed:
Feb. 22, 1979
Gary R Buske, Midland, MI (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
A cross-linked polymer of a monovinylidene aromatic compound is diacylaminoalkylated by contacting said polymer with an aldehyde and a diacylamine in the presence of an acid catalyst. The resulting diacylaminoalkylated polymer is readily hydrolyzed to an aminoalkylated form which is useful as a weak base ion exchange resin and as a precursor in the preparation of other ion exchange resins. For example, reacting a cross-linked polystyrene with paraformaldehyde and phthalimide in the presence of sulfuric acid and subsequently hydrolyzing the reaction product forms a cross-linked poly(aminomethyl styrene) useful as a weak base ion exchange resin and as a precursor in the preparation of strong base or chelate type resins.