Process for preparing aqueous dispersions of multistage emulsion polymers
OwnerKathleen Hughes, Alfred Schultzinventors
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Abstract
A process for preparing aqueous polymer dispersions is described comprising the steps: (a) polymerizing at least one ethylenically unsaturated monomer having one or more ethylenically unsaturated groups and/or at least one ethylenically unsaturated surfactant monomer by free-radical aqueous emulsion polymerization to provide a first polymer; and (b) further polymerizing, in one or more successive polymerization stages, one or more monomers selected from ethylenically unsaturated monomers and/or ethylenically unsaturated surfactant monomers by free-radical polymerization in aqueous dispersion of the first polymer.
Claims8
A process for preparing aqueous polymer dispersions comprising the steps:
- (a) polymerizing at least one ethylenically unsaturated monomer having one or more ethylenically unsaturated groups and at least one ethylenically unsaturated surfactant monomer by free-radical aqueous emulsion polymerization to provide a first polymer;
- and (b) further polymerizing, in one or more successive polymerization stages, one or more monomers selected from ethylenically unsaturated monomers and ethylenically unsaturated surfactant monomers by free-radical polymerization in aqueous dispersion of the first polymer;
- wherein the difference in glass transition temperature between the first polymer and a corresponding polymer formed from each successive polymerization stage is greater than or equal to 10° C., the amount of the ethylenically unsaturated monomers polymerized to prepare the first polymer, based on the amount of all of the monomers polymerized in the process, is between 75% by weight and 99.9% by weight, the total amount of the ethylenically unsaturated monomers polymerized in all polymerization stages, based on the total amount of all of the monomers polymerized in the process, is between 0.1% by weight and 25% by weight.
A process for preparing aqueous polymer dispersions comprising the steps:
- (a) polymerizing at least one ethylenically unsaturated monomer having one or more ethylenically unsaturated groups and at least one ethylenically unsaturated surfactant monomer by free-radical aqueous emulsion polymerization to provide a first polymer;
- and (b) further polymerizing, in one or more successive polymerization stages, one or more monomers selected from ethylenically unsaturated monomers by free-radical polymerization in aqueous dispersion of the first polymer;
- wherein the difference in glass transition temperature between the first polymer and a corresponding polymer formed from each successive polymerization stage is greater than or equal to 10° C., the amount of the ethylenically unsaturated monomers polymerized to prepare the first polymer, based on the amount of all of the monomers polymerized in the process, is between 75% by weight and 99.9% by weight, the total amount of the ethylenically unsaturated monomers polymerized in all polymerization stages, based on the total amount of all of the monomers polymerized in the process, is between 0.1% by weight and 25% by weight.
A process for preparing aqueous polymer dispersions comprising the steps:
- (a) polymerizing at least one ethylenically unsaturated monomer having one or more ethylenically unsaturated groups by free-radical aqueous emulsion polymerization to provide a first polymer;
- and (b) further polymerizing, in one or more successive polymerization stages, one or more monomers selected from ethylenically unsaturated monomers and ethylenically unsaturated surfactant monomers by free-radical polymerization in aqueous dispersion of the first polymer;
- wherein the difference in glass transition temperature between the first polymer and a corresponding polymer formed from each successive polymerization stage is greater than or equal to 10° C., the amount of the ethylenically unsaturated monomers polymerized to prepare the first polymer, based on the amount of all of the monomers polymerized in the process, is between 75% by weight and 99.9% by weight, the total amount of the ethylenically unsaturated monomers polymerized in all polymerization stages, based on the total amount of all of the monomers polymerized in the process, is between 0.1% by weight and 25% by weight.
Dependencies are inferred from the claim text.