N-vinylamide polymers as stabilizing protective colloids in aqueous emulsion polymerization
AssigneeAir Products and Chemicals, Inc.
InventorsWilliam E. Lenney, Dennis Sagl
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Abstract
A method for preparing aqueous polymer emulsions by effecting polymerization of vinyl monomers in the presence of a stabilizing amount of a water soluble poly(N-vinylformamide) containing polymer as a protective colloid and aqueous polymer emulsions containing poly(N-vinylformamide) stablizer.
Claims13
In a method for preparing an aqueous polymer emulsion containing a thermoplastic polymer therein by the free radical aqueous emulsion polymerization of at least one monomer in the presence of a stabilizing composition, the improvement which comprises using a stabilizing composition comprising from 0.5 to 20% by weight of water soluble polymer containing poly(N-vinylformamide) units.
In a method for preparing an aqueous polymer emulsion containing a thermoplastic polymer by the free radical aqueous emulsion polymerization of at least one monomer in the presence of a stabilizing composition, the improvement which comprises using a stabilizing composition consisting essentially of 0.5-20 wt %, based on total monomers, of a poly(N-vinylformamide)polymer and, optionally, an emulsifying agent and/or protective colloid, the poly(N-vinylformamide) having the following formula:
- ##STR5## where m=0-15 mole %,
- n=0-15 mole %,
- x=70-100 mole %, and
- y=0-20% of x;
- and a weight average molecular weight in the range of 60,000 to 325,000.
Dependencies are inferred from the claim text.