Nova Patents
EP1558657B1

Vesiculated polymer particles

Abstract

Vesiculated polymer particles and a method of manufacture thereof, are suitable for the beneficial replacement of titanium dioxide pigments and extenders amongst others, and have improved opacity, whiteness, scrub resistance and water resistance due. The manufacturing process exhibits effective control of particle size and particle size distribution.

Term

Term ended

Expired 23 September 2023, 3 years ago.

  1. Priority
  2. Filed
  3. Granted
  4. Expired
  5. Today

10 claims: 3 independent, 7 dependent

  1. 1
    Vesiculated polyester polymer particles characterised in that they include particulate solids and have associated with the surfaces thereof, long chain aliphatic chemical groups and/or sterically hindered, branched chained chemical groups, which are hydrophobic in nature and which are derived from Glycidyl methacrylate;Octadecene;Lauryl methacrylate;Cyclohexene;Acrylated castor oil;Acrylated ricinoleic acid;Methacrylated ricinoleic acid;Hydroxy-ethyl acrylate;Soya Bean Oil;Unsaturated fatty acids, e.g. Oleic acid, tallow fatty acid;Unsaturated fatty alcohols, e.g. Oleyl alcohol, pentadeca-12-ene-1-ol.;Oleamide;Triglycerides, e.g. tall oil, ting oil;Ethylenic unsaturated urethanes;Acrylic unsaturated urethanes;Air drying short oil alkyds;Alkyl and Aryl Esters of maleic anhydride, singly or in combination.
  2. 5
    Vesiculated polymer particles according to claims 3 or 4 characterised in that the diluent monomer comprises ethylenic, acrylic and methacrylic functional monomers, singly or in combination.
  3. 7
    Vesiculated polymer particles according to claims 3 to 6 characterised in that the polyester resin composition comprises by mass %, propylene glycol 30,35%, phthalic anhydride 12,96%, maleic anhydride 25,75%, styrene 30,75%, inhibitor (10% solution)0.18%.
  4. 8
    A method of manufacture of vesiculated particles according to any one of claims 3 to 7, characterised in that it includes the steps of:- pre-dispersing pigment particles in a polyester;- dissolving the pre-dispersed pigment-polyester in a suitable mixture of diluent monomer and hydrophobic co-nonomer in the presence of a water-soluble base;- forming a stable emulsion of droplets of solution of the pre-dispersed pigment-polyester and monomer (oil phase) in water;- and polymerising the polyester and co-polymerisable monomer thereby producing granules of opaque, cross-linked vesiculated particles as a dispersion in water, the particles including hydrophobic groups associated with their surfaces.
  5. 9
    A method of manufacture of vesiculated particles according to any one of claims 3 to 7 characterised in that it includes the steps of :- pre-dispersing pigment particles in a polyester;- dissolving the pre-dispersed pigment-polyester in a suitable monomer in the presence of a water-soluble base;- forming a stable emulsion of droplets of solution of the pre-dispersed pigment-polyester and monomer (oil phase) in water;- adding a hydrophobic monomer and polymerising the polyester and co-polymerisable monomer thereby producing granules of opaque, cross-linked vesiculated particles as a dispersion in water, the particles including hydrophobic groups associated with their surfaces.
Independent claims5