Process for preparing dispersions stabilized with protective colloid
AssigneeHoechst Aktiengesellschaft
InventorsBettina Gerharz, Matthias Kroggel
Life of this patent
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Abstract
Process for preparing dispersions stabilized with protective colloid using sulfonato-containing polyvinyl acetals as the protective colloid in the preparation of the dispersions, if desired in combination with additional emulsifiers or additional protective colloids. The dispersions exhibit a pH-dependent viscosity and are suitable, for example, for coating and bonding substrates and as rheology modifiers and binders and for use in solid paints.
Claims23
An aqueous latex dispersion having a pH-dependent viscosity, comprising:
- sulfonato-containing polyvinyl acetals as a protective colloid, wherein the sulfonato-containing polyvinylacetals are prepared by acetalization of sulfonato-containing polyvinyl alcohol with an aldehyde, and wherein at least a portion of said sulfonato-containing polyvinyl acetals have vinyl monomer units grafted thereto;
- and
- at least one latex polymer containing vinyl monomer units, and wherein said grafted vinyl monomer units are identical to at least one of said vinyl monomer units of said at least one latex polymer.
An aqueous latex dispersion having a pH-dependent viscosity, said dispersion formed by a process comprising:
- forming a dispersion of vinyl monomers and a protective colloid including sulfonato-containing polyvinyl acetals in a reaction system wherein the sulfonato-containing polyvinylacetals are prepared by acetalization of sulfonato-containing polyvinyl alcohol with an aldehyde;
- and
- emulsion polymerizing said vinyl monomers in the presence of said protective colloid to produce a latex dispersion stabilized with said protective colloid, wherein at least a part of said vinyl monomers are grafted onto said sulfonato-containing polyvinyl acetals.
A process for preparing an aqueous latex dispersion stabilized with a protective colloid, comprising:
- forming a dispersion of vinyl monomers and a protective colloid including ethenesulfonate units-containing polyvinyl acetals in a reaction system wherein the ethenesulfonate units-containing polyvinylacetals are prepared by acetalization of an ethenesulfonate units-containing polyvinyl alcohol with an aldehyde;
- and
- emulsion polymerizing said vinyl monomers in the presence of said protective colloid to produce a latex dispersion stabilized with said protective colloid, wherein at least a part of said vinyl monomers are grafted onto said ethenesulfonate units-containing polyvinyl acetals.
An aqueous latex dispersion having a pH-dependent viscosity, comprising:
- ethenesulfonate units-containing polyvinyl acetals as a protective colloid, wherein the ethenesulfonate units-containing polyvinylacetals are prepared by acetalization of an ethenesulfonate units-containing polyvinyl alcohol with an aldehyde, and wherein at least a portion of said ethenesulfonate units-containing polyvinyl acetals have vinyl monomer units grafted thereto;
- and
- at least one latex polymer containing vinyl monomer units, and wherein said grafted vinyl monomer units are identical to at least one of said vinyl monomer units of said at least one latex polymer.
Dependencies are inferred from the claim text.