Polyacrylamide and polyacrylic acid polymers

Patent 4622356 Issued on November 11, 1986. Estimated Expiration Date:

July 10, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3488269

Analytical element containing a barrier zone and process employing same Patent #: 4478944
Issued on: 10/23/1984
Inventor: Gross , et al.

Inventors

Assignee

American Cyanamid Company

Application

No. 06/753466 filed on 07/10/1985

US Classes:

524/100, Six-membered nitrogen ring having two or more ring nitrogen atoms430/281.1, Radiation sensitive composition comprising ethylenically unsaturated compound430/294, By solvent removal524/108, Two or more chalcogen atoms in the same hetero ring524/216, At least one solid polymer derived from ethylenic reactants only524/345, Polyhydric aryl-OH compound524/346, 1,3-dihydroxy, e.g., resorcinol, etc.524/547, From reactant-containing atom other than O, N, C, halogen, or hydrogen524/555, From nitrogen-containing monomer other than acrylonitrile or methacrylonitrile524/556, From carboxylic acid or ester thereof monomer525/328.2, Polymer derived from monomer containing nitrogen other than: unsubstituted ammonium, acrylonitrile, acrylamide, methylolacrylamide and the corresponding methacryl materials525/329.4, Polymer derived from acrylamide or methacrylamide monomer525/329.7, Polymer derived from acrylic or methacrylic acids, acid halides or salt monomers525/374, Chemical treating agent is a nitrogen-containing compound525/375, Contains nitrogen atom in a heterocyclic ring525/383, Chemical treating agent contains elemental oxygen or oxygen-containing compound525/386, Oxygen compound is a carboxylic acid, ester, anhydride, or lactone thereof526/204, Material contains heterocyclic compound526/207, Material contains water and a hydrocarbon526/210, Material contains alcohol or alcoholate526/287, From monomer containing three or more oxygen atoms bonded to a single sulfur atom, e.g., sulfonate, etc.526/303.1, From carboxylic acid amide-containing monomer526/304, Contains oxygen atom other than in amide form bonded to a carbon atom526/307.6, Oxygen atom is part of carboxylic acid group526/317.1From carboxylic acid monomer

Examiners

Primary: Lilling, Herbert J.

Attorney, Agent or Firm

International Classes

C08F 20/00 (20060101)
C08F 20/56 (20060101)
C08F 20/06 (20060101)

Abstract

The use of a cyclic compound containing a ##STR1## group, i.e., methone, has been found to allow a poor acrylamide or acrylic acid or 2-acrylamide-2-methylpropane sulfonic acid and its salts monomer to be polymerized to a polymer having improved performance characteristics and/or improved rates of polymerization. Optionally, urea is added with the methone.