Aqueous hyperbranched macromolecule coating compositions
AssigneeDsm IP Assets B.V.
InventorsEmilio Martin, Gerardus Cornelis Overbeek, Pablo Steenwinkel, Ronald Tennebroek
Life of this patent
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Abstract
An aqueous coating composition comprising a crosslinkable water-dispersible hyperbranched macromolecule(s) wherein the composition when drying has an open time of at least 20 minutes, a wet edge time of at least 10 minutes, a tack free time ≦15 hours, a dust free time ≦5 hours and an equilibrium viscosity of ≦5,000 Pa·s at any solids content when drying in the range of from 20 to 55% by weight using any shear rate in the range of from 9±0.5 to 90±5 s−1 and at 23±2° C.
Claims19
An aqueous ambient temperature crosslinkable coating composition comprising a crosslinkable water-dispersible hyperbranched macromolecule(s) with a PDi less than 60 and a dispersed polymer(s) with a particle size in the range of from 25 to 1000 nm and an acid value below 150 mgKOH/g where the ratio of the crosslinkable hyperbranched macromolecule(s) to the dispersed polymer(s) is in the range of from 90:10 to 25:75 on a solids weight basis, and wherein said composition when drying to form a coating has the following properties at 23±2° C.:
- i) an open time of at least 20 minutes at 23±2° C.;
- ii) a wet edge time of at least 10 minutes at 23±2° C.;
- iii) a tack-free time of ≦15 hours at 23±2° C.;
- iv) a dust free time of ≦5 hours at 23±2° C.;
- v) 0 to 25% of co-solvent by weight of the composition;
- and
- vi) an equilibrium viscosity of ≦5,000 Pa·s, when measured using any shear rate in the range of from 0.09±0.005 to 90±5 s−1 and an equilibrium viscosity of ≦3,000 Pa·s when measured using any shear rate in the range of from 0.9±0.05 to 90±5 s−1, and an equilibrium viscosity of ≦1,500 Pa·s when measured using any shear rate in the range of from 9±0.5 to 90±5 s−1, at any solids content when drying in the range of from 20 to 55% by weight of the composition and at 23±2° C.
- wherein said hyperbranched macromolecule(s) has a solution viscosity ≦80 Pa·s, as determined from an 80% by weight solids solution of the crosslinkable hyperbranched macromolecule(s) in at least one of the solvents selected from the group consisting of N-methylpyrrolidone, n-butylglycol and mixtures thereof, using a shear rate of 90±5 s−1 and at 50±2° C.;
- and
- wherein said hyperbranched macromolecule(s) has a solution viscosity ≦100 Pa·s, as determined from a 70% by weight solids solution of the crosslinkable hyperbranched macromolecule(s) in a solvent mixture consisting of:
- i) at least one of the solvents selected from the group consisting of N-methylpyrrolidone, n-butylglycol and mixtures thereof;
- ii) water and
- iii) N,N-dimethylethanolamine;
- where i), ii) and iii) are in weight ratios of 20/7/3 respectively, using a shear rate of 90±5 s−1 and at 23±2° C.;
- and
- wherein said dispersed polymer(s) is at least one member of the group consisting of vinyl polymer;
- polyurethane;
- polyester;
- polyether;
- polyamide;
- polyepoxide;
- and polymer hybrids thereof.
An aqueous ambient temperature crosslinkable coating composition comprising
- i) 3 to 26% of a crosslinkable hyperbranched macromolecule(s) with a PDi less than 60 and crosslinkable oligomer(s) by weight of the composition of which at least 52 wt % is a crosslinkable hyperbranched macromolecule(s) with a PDI less than 60;
- ii) 0 to 6.5% of a non-crosslinkable oligomer(s) by weight of the composition;
- iii) 10 to 56% of dispersed polymer(s) with a particle size in the range of from 25 to 1000 nm and an acid value below 150 mgKOH/g by weight of the composition;
- iv) 0 to 15% of co-solvent by weight of the composition;
- v) 5 to 65% of water by weight of the composition;
- where i)+ii)+iii)+iv)+v)=100%
- wherein said composition when drying to form a coating has the following properties:
- i) an open time of at least 20 minutes at 23±2° C.;
- ii) a wet edge time of at least 10 minutes at 23±2° C.;
- iii) a tack-free time of ≦15 hours at 23±2° C.;
- iv) a dust free time of ≦5 hours at 23±2° C.;
- v) 0 to 25% of co-solvent by weight of the composition;
- vi) an equilibrium viscosity of 5,000 Pa·s, when measured using any shear rate in the range of from 0.09±0.005 to 90±5 s−1, and an equilibrium viscosity of ≦3,000 Pa·s when measured using any shear rate in the range of from 0.9±0.05 to 90±5 s−1, and an equilibrium viscosity of ≦1,500 Pa·s when measured using any shear rate in the range of from 9±0.5 to 90±5 s−1, at any solids content when drying in the range of from 20 to 55% by weight of the composition and at 23±2° C.;
- wherein said hyperbranched macromolecule(s) has a solution viscosity ≦80 Pa·s, as determined from an 80% by weight solids solution of the crosslinkable hyperbranched macromolecule(s) in at least one of the solvents selected from the group consisting of N-methylpyrrolidone, n-butylglycol and mixtures thereof, using a shear rate of 90±5 s−1 and at 50±2° C.;
- and
- wherein said hyperbranched macromolecule(s) has a solution viscosity ≦100 Pa·s, as determined from a 70% by weight solids solution of the crosslinkable hyperbranched macromolecule(s) in a solvent mixture consisting of:
- i) at least one of the solvents selected from the group consisting of N-methylpyrrolidone, n-butylglycol and mixtures thereof;
- ii) water and
- iii) N,N-dimethylethanolamine;
- where i), ii) and iii) are in weight ratios of 20/7/3 respectively, using a shear rate of 90±5 s−1 and at 23±2° C.;
- and
- wherein said dispersed polymer(s) is at least one member of the group consisting of vinyl polymer;
- polyurethane;
- polyester;
- polyether;
- polyamide;
- polyepoxide;
- and polymer hybrids thereof.
Dependencies are inferred from the claim text.