Polyurethane dispersants

A dispersant comprising the addition reaction product of a polyisocyanate having an average functionality of from 2 to 10 and one or more poly(oxyalkylenecarbonyl) chains (POAC chain) derived from two or more different hydroxy carboxylic acids or lactones thereof, including their salts and optionally a polymerisation terminating group with is a C1-35-hydrocarbyl group which may be aromatic, alicyclic, heterocyclic or linear or branched saturated aliphatic, optionally substituted by halogen, C1-6-alkoxy, ester, amide, urethane and ether groups, wherein each polyisocyanate contains one or more POAC chains provided that there remain two isocyanate groups which are not reacted with the POAC chains one of which isocyanate groups is reacted with a cross-linker and the other of which is reacted with a modifier.

A dispersant comprising the addition reaction product of a polyisocyanate having an average functionality of from 2 to 10 and one or more poly(oxyalkylenecarbonyl) chains (POAC chain) derived from two or more different hydroxy carboxylic acids or lactones thereof, including their salts and optionally a polymerisation terminating group with is a C1-35-hydrocarbyl group which may be aromatic, alicyclic, heterocyclic or linear or branched saturated aliphatic, optionally substituted by halogen, C1-6-alkoxy, ester, amide, urethane and ether groups, wherein the polyisocyanate is further reacted with (B) a mixture from (B1) a TPOAC alcohol and (B2) a monohydroxy monocarboxylic acid or monoamino monocarboxylic acid and (C) a compound containing at least one basic ring nitrogen and an isocyanate-reactive group.

A dispersant comprising the addition reaction product of a polyisocyanate having an average functionality of from 2 to 10 and one or more poly(oxyalkylenecarbonyl) chains (POAC chain) derived from two or more different hydroxy carboxylic acids or lactones thereof, including their salts and optionally a polymerisation terminating group with is a C1-35-hydrocarbyl group which may be aromatic, alicyclic, heterocyclic or linear or branched saturated aliphatic, optionally substituted by halogen, C1-6-alkoxy, ester, amide, urethane and ether groups, wherein the polyisocyanate is reacted with (B) one or more POAC chains or TPOAC alcohols, (C) a dicarboxylic acid compound and (D) a compound containing at least one basic ring nitrogen atom and a isocyanate reactive group.

A dispersant comprising the addition reaction product of a polyisocyanate having an average functionality of from 2 to 10 and one or more poly(oxyalkylenecarbonyl) chains (POAC chain) derived from two or more different hydroxy carboxylic acids or lactones thereof, including their salts and optionally a polymerisation terminating group with is a C1-35-hydrocarbyl group which may be aromatic, alicyclic, heterocyclic or linear or branched saturated aliphatic, optionally substituted by halogen, C1-6-alkoxy, ester, amide, urethane and ether groups and, which contains one or more POAC chains or TPOAC alcohols and a modifier which is a heterocyclic compound which contains at least one nitrogen atom which is obtained by reacting an acrylate or epoxide with the heterocyclic ring system.

A composition comprising a particulate solid and a dispersant comprising the addition reaction product of a polyisocyanate having an average functionality of from 2 to 10 and one or more poly(oxyalkylene carbonyl), chains (POAC chain) derived from two or more different hydroxy carboxylic acids or lactones thereof, including their salts.

A dispersion comprising a particulate solid, organic medium and a dispersant comprising the addition reaction product of a polyisocyanate having an average functionality of from 2 to 10 and one or more poly(oxyalkylene carbonyl) chains (POAC chain) derived from two or more different hydroxy carboxylic acids or lactones thereof, including their salts.

A millbase comprising a particulate solid, film-forming binder resin, organic medium and a dispersant comprising the addition reaction product of a polyisocyanate having an average functionality of from 2 to 10 and one or more poly(oxyalkylene carbonyl) chains (POAC chain) derived from two or more different hydroxy carboxylic acids or lactones thereof, including their salts.

A dispersant comprising the addition reaction product of a polyisocyanate having an average functionality of from 2 to 10 and one or more poly(oxyalkylenecarbonyl) chains (POAC chains) derived from two or more different hydroxy carboxylic acids or lactones thereof and a polymerisation terminating group of formula T—OH where T is C1-35-hydrocarbyl optionally substituted by halogen, C1-6-alkoxy, ester, amide, urethane and ether groups.