Aqueous alkyd and vinyl polymer dispersions
AssigneeAvecia Limited
InventorsGerardus Cornelis Overbeek, Jurgen Scheerder, Pablo Steenwinkel, Ronald Tennebroek
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Abstract
An aqueous dispersion comprising an alkyd, vinyl polymer I, vinyl polymer II and a liquid medium where vinyl polymer I is preformed prior to incorporation into the aqueous dispersion and where vinyl polymer II is prepared in the presence of the alkyd and the vinyl polymer I.
Claims15
An aqueous dispersion comprising:
- (i) alkyd;
- (ii) vinyl polymer I;
- (iii) vinyl polymer II;
- and
- (iv) liquid medium;
- wherein said vinyl polymer I is pre-formed prior to incorporation into the aqueous dispersion and wherein said vinyl polymer II is prepared in the presence of the alkyd and the vinyl polymer I.
A dispersion according to any one of the preceding claims wherein the vinyl polymer I comprises 1 to 20% by weight of acetoacetoxy ethyl methacrylate.
A dispersion according to any one of the preceding claims wherein the vinyl polymer I comprises 10 to 40% by weight of acrylonitrile;
- 30 to 60% by weight of styrene;
- 2 to 8% by weight of acid functional olefinically unsaturated monomer(s);
- and 0 to 50% by weight of other olefinically unsaturated monomer(s);
- wherein the sum of the percentages add up to 100%.
A dispersion according to any one of the preceding claims wherein the vinyl polymer II comprises one or more monomers selected from methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate and styrene.
A dispersion according to any one of the preceding claims wherein vinyl polymer II comprises from 1 to 50% w/w based on the weight of alkyd, vinyl polymer I and vinyl polymer II.
A dispersion according to any one of the preceding claims wherein the weight ratio of vinyl polymer I to vinyl polymer II is in the range of from 30:70 to 99:1.
A dispersion according to any one of the preceding claims wherein the weight ratio of vinyl polymer I to vinyl polymer II is in the range of from 70:30 to 97:3.
A dispersion according to any one of the preceding claims wherein the weight ratio of alkyd to vinyl polymer I and vinyl polymer II together in the range of from 1:95 to 90:10.
A dispersion according to any one of the preceding claims wherein the liquid medium comprises 50 to 100% by weight of water.
A process for preparing an aqueous dispersion according to any one of the preceding claims comprising combining:
- (a) alkyd;
- (b) olefinically unsaturated monomer(s);
- (c) vinyl polymer I;
- and
- (d) liquid medium
- at a temperature in the range of from 0 to 85° C., followed by polymerisation of the olefinically unsaturated monomer(s) to give vinyl polymer II.
Dependencies are inferred from the claim text.