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AssigneeOrica Australia Pty Ltd
InventorsAmanda Chalmers, Jason Farrugia, Elizabeth Salter, Christopher Such, Olga Mackinnon
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The invention provides a process for preparing an aqueous dispersion of water insoluble heteropolymeric particles comprising polymerising in an aqueous reaction medium ethylenically unsaturated monomers, said ethylenically unsaturated monomers comprising ionisable ethylenically unsaturated monomers and non-ionisable hydrophilic ethylenically unsaturated monomers, to form said heteropolymeric particles dispersed in said aqueous reaction medium, wherein the monomers in said reaction medium at any point in time comprise less than 5 weight % of ionisable ethylenically unsaturated monomer, wherein for at least a part of the polymerisation the monomers in said reaction medium have a composition which is maintained with an ionisable ethylenically unsaturated monomer content of from 0.5 to less than 5 weight % throughout polymerisation of at least 30 weight % of the total amount of monomers polymerised to form the heteropolymeric particles, and wherein the total amount of non-ionisable hydrophilic ethylenically unsaturated monomers and ionisable ethylenically unsaturated monomers polymerised constitutes at least 75 weight % of the total amount of monomers polymerised to form the heteropolymeric particles, a method of preparing a paint comprising conventional paint additives and the aqueous dispersion of water insoluble heteropolymeric particles of the invention, and a novel aqueous dispersion of water insoluble heteropolymeric particles.
A process for preparing an aqueous dispersion of water insoluble heteropolymeric particles comprising polymerising in an aqueous reaction medium ethylenically unsaturated monomers, said ethylenically unsaturated monomers comprising ionisable ethylenically unsaturated monomers and non-ionisable hydrophilic ethylenically unsaturated monomers, to form said heteropolymeric particles dispersed in said aqueous reaction medium, wherein the monomers in said reaction medium at any point in time comprise less than 5 weight % of ionisable ethylenically unsaturated monomer, wherein for at least a part of the polymerisation the monomers in said reaction medium have a composition which is maintained with an ionisable ethylenically unsaturated monomer content of from 0.5 to less than 5 weight % throughout polymerisation of at least 30 weight % of the total amount of monomers polymerised to form the heteropolymeric particles, and wherein the total amount of non-ionisable hydrophilic ethylenically unsaturated monomers and ionisable ethylenically unsaturated monomers polymerised constitutes at least 75 weight % of the total amount of monomers polymerised to form the heteropolymeric particles.
The process according to 23, wherein the polymer composition formed through polymerisation of monomers provided in the second feed has a Tg of from about −50° C. to about 100° C.
An aqueous dispersion of water insoluble heteropolymeric particles, said heteropolymeric particles comprising polymerised ionisable ethylenically unsaturated monomers and polymerised non-ionisable hydrophilic ethylenically unsaturated monomers, wherein the polymerised ionisable ethylenically unsaturated monomers are present in an amount of less than 5 weight % throughout the polymeric composition of the heteroploymeric particles, wherein a segment which represents at least 30 weight % of the heteropolymeric particles has a polymeric composition which comprises no less than about 0.5 weight % and less than 5 weight % of polymerised ionisable ethylenically unsaturated monomers, based on the total weight of monomers polymerised to form the segment, and wherein the combined amount of polymerised ionsiable ethylenically unsaturated monomers and non-ionisable hydrophilic ethylenically unsaturated monomers constitute at least 75 weight % of the heteropolymeric particles.
Dependencies are inferred from the claim text.