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US 4,452,957 AGranted
Process for the production of homo- and co-polymers of quaternary ammonium monomers
AssigneeNational Starch and Chemical Corporation
InventorDennis Neigel
Life of this patent
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Abstract
Homo- and copolymers of quaternary ammonium monomers are prepared directly in dry form by a process which comprises forming a solution of the monomer(s), solvent and a free-radical initiator and simultaneously polymerizing the monomers and drying the solution at a temperature above the boiling point of the solvent.
Claims10
A process for the production of homo- and co-polymers of a quaternary ammonium monomer in dry form comprising the steps of:
- (a) forming a solution of the monomer(s), solvent and free-radical initiator;
- (b) simultaneously polymerizing the monomer and drying the solution on a drum drier at a temperature above the boiling point of the solvent;
- and
- (c) recovering the resultaant dry polymer;
- wherein the monomer of (a) contains at least 50% by weight of the total monomer(s) of a quaternary ammonium monomer represented by the formula:
- ##STR4## where R.sub.1 and R.sub.2 each represent a member selected from the group consisting of hydrogen and methyl and ethyl radicals;
- R.sub.3 and R.sub.4 each represent a member selected from the goup consisting of alkyl, aryl, cycloaklyl, hydroxyalkyl and alkoxyalkyl radicals having from 1 to 18 carbon atoms, and Y- represents an anion, and wherein the solvent of (a) is selected from the group consisting of water and C.sub.1-8 carbon components containing hydroxyl, ketone, aldehyde, ester or halide substitution.
4 more elements
Dependencies are inferred from the claim text.