Aqueous, high-solids synthetic rubber emulsion and its preparation
AssigneeHuels Aktiengesellschaft
InventorThomas Sauer
Life of this patent
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Abstract
A process for the chemical agglomeration of a finely dispersed, aqueous synthetic rubber emulsion which involves: contacting the finely dispersed, aqueous synthetic rubber emulsion with an agglomeration agent of a water-soluble or water-dispersible copolymer, wherein the copolymer contains 10 to 90% by weight of one or more hydrophobic, water-insoluble, olefinically unsaturated monomers; and 90 to 10% by weight of one or more hydrophilic, water-soluble and salt-forming, olefinically unsaturated monomers; at a temperature and concentration sufficient to cause agglomeration of the finely dispersed, aqueous synthetic rubber emulsion, and the use of the thus obtained high solids synthetic rubber emulsion in the production of foamed shaped articles and foamed latices is provided.
Claims13
A process for the chemical agglomeration of a finely dispersed, aqueous synthetic rubber emulsion comprising:
- contacting the finely dispersed, aqueous synthetic rubber emulsion with an agglomeration agent comprising a water-soluble or water-dispersible copolymer comprising
- 10 to 90% by weight of one or more hydrophobic, water-insoluble, olefinically unsaturated monomers;
- and
- 90 to 10% by weight of one or more hydrophilic, water-soluble and salt-forming, olefinically unsaturated monomers selected from the group consisting of olefinically unsaturated sulphonic acid compounds and salts thereof;
- at a temperature and concentration sufficient to cause agglomeration of the finely dispersed, aqueous synthetic rubber emulsion.
An aqueous, high-solids synthetic rubber emulsion having a solids content of 66 to 72% by weight, which is obtained by a process comprising:
- agglomerating a finely divided synthetic rubber emulsion by contacting said finely divided synthetic rubber emulsion with an agglomeration agent comprising a water-soluble or water-dispersible copolymer comprising 10 to 90% by weight of one or more hydrophobic, water-insoluble, olefinically unsaturated monomers and 90 to 10% by weight of one or more hydrophilic, water-soluble and salt-forming, olefinically unsaturated monomers selected from the group consisting of olefinically unsaturated sulphonic acid compounds and salts thereof, at a temperature and concentration sufficient to obtain an agglomerated emulsion;
- and
- concentrating the agglomerated emulsion to a solids level of from 66 to 72% by weight.
A method for preparing latex foams comprising:
- agglomerating a finely divided synthetic rubber emulsion by contacting said finely divided synthetic rubber emulsion with an agglomeration agent comprising a water-soluble or water-dispersible copolymer comprising 10 to 90% by weight of one or more hydrophobic, water-insoluble, olefinically unsaturated monomers and 90 to 10% by weight of one or more hydrophilic, water-soluble and salt-forming, olefinically unsaturated monomers selected from the group consisting of olefinically unsaturated sulphonic acid compounds and salts thereof, at a temperature and concentration sufficient to obtain an agglomerated emulsion;
- concentrating the agglomerated emulsion to a solids level of from 66 to 72% by weight to obtain a high solids synthetic rubber emulsion;
- and
- foaming said high solids synthetic rubber emulsion.
A shaped foamed article prepared by agglomerating a finely divided synthetic rubber emulsion by contacting said finely divided synthetic rubber emulsion with an agglomeration agent comprising a water-soluble or water-dispersible copolymer comprising 10 to 90% by weight of one or more hydrophobic, water-insoluble, olefinically unsaturated monomers and 90 to 10% by weight of one or more hydrophilic, water-soluble and salt-forming, olefinically unsaturated monomers selected from the group consisting of olefinically unsaturated sulphonic acid compounds and salts thereof, at a temperature and concentration sufficient to obtain an agglomerated emulsion;
- concentrating the agglomerated emulsion to a solids level of from 66 to 72% by weight to obtain a high solids synthetic rubber emulsion;
- mechanically expanding said high solids synthetic rubber emulsion with a gaseous blowing agent to obtain an expanded latex;
- and
- vulcanizing said expanded latex.
Dependencies are inferred from the claim text.