Protective sealable coating compositions
AssigneeAkzo Nobel Coatings International B.V.
InventorsRiaz Ahmad Choudhery, David George James
Life of this patent
Estimating the term…
Abstract
A dispersion of polymer microparticles in organic liquid, the polymer comprising the reaction product of i) from 2 to 40 parts by weight of a first polymer being polypropylene polymer having sufficient carboxylic acid and/or carboxylic acid anhydride groups equivalent to an acid value of from 2 to 50 mg KOH/g nv polymer and ii) from 60 to 98 parts by weight of a second polymer having a molar excess of functional groups capable of reacting with the carboxylic acid and/or carboxylic acid anhydride groups of the polypropylene polymer and wherein the organic liquid is chosen to be a good solvent for the second polymer and a poor solvent for the polypropylene polymer.
Claims22
1-26. (canceled)
A dispersion of polymer microparticles in organic liquid, the polymer comprising the reaction product of
- from 2 to 40 parts by weight of a first polymer being polypropylene polymer having sufficient carboxylic acid and/or carboxylic acid anhydride groups equivalent to an acid value of from 2 to 50 mg KOH/g nv polymer and
- ii) from 60 to 98 parts by weight of a second polymer having a molar excess of functional groups capable of reacting with the carboxylic acid and/or carboxylic acid anhydride groups of the polypropylene polymer
- wherein the organic liquid is chosen to be a good solvent for the second polymer and a poor solvent for the polypropylene polymer.
A process for the manufacture of a dispersion of polymer microparticles in organic liquid, comprising the steps of
- i) providing a mixture comprising from 2 to 40 parts by weight of a first polypropylene polymer having sufficient carboxylic acid and/or carboxylic acid anhydride groups equivalent to an acid value of from 2 to 50 mg KOH/g nv polymer and from 60 to 98 parts by weight of a second polymer having a molar excess of functional groups capable of reacting with the carboxylic acid and/or carboxylic acid anhydride groups of the polypropylene
- ii) causing the polymers to melt at a chosen temperature under conditions of high shear to form an intimate mixture of the polymers
- iii) causing the carboxylic acid and/or carboxylic acid anhydride groups of the polypropylene to react with at least some of the functional groups of the second polymer, under conditions of high shear
- iv) diluting the resulting mixture of step iii) with an organic liquid at a temperature such that a substantially homogeneous solution is formed
- v) cooling the solution to a temperature whereby the polymer microparticles of the dispersion are formed.
Dependencies are inferred from the claim text.