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US 7,022,759 B2Granted
Aqueous polyester coating compositions
AssigneeAvecia Limited
InventorsEmilio Martin, Gerardus Cornelis Overbeek, John Christopher Padget, Pablo Steenwinkel, Petrus Johannes Maria Van Oorschot, Ronald Tennebroek
Life of this patent
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Abstract
An aqueous coating composition comprising a crosslinkable water-dispersible polyester oligomer wherein said composition when drying to form a coating has the following properties: an open time of at least 20 minutes, a wet edge time of at least 10 minutes, a thumb hard time of ≦48 hours and a tack-free time ≦20 hours and an equilibrium viscosity of ≦5000 Pa.s at any solids content when drying in the range of from 20 to 55 wt % using a shear rate in the range of from 9±0.5 to 90±5 s−1 and at 23±2° C.
Claims26
An aqueous coating composition comprising an ambient temperature crosslinkable water-dispersible polyester oligomer(s) and a dispersed polymer(s) having a measured weight average molecular weight ≧120,000 Daltons where the ratio of crosslinkable polyester oligomer(s) to the dispersed polymer(s) is in the range of from 90:10 to 20:80, and from 0 to 25% of co-solvent by weight of the composition, and 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 thumb hard time of ≦48 hours at 23±20° C.;
- iv) a tack-free time of ≦20 hours at 23±2° C.;
- and
- v) an equilibrium viscosity of ≦3,000 Pa.s, at any solids content when drying in the range of from 20 to 55% by weight of the composition, using any shear rate in the range of from 9±0.5 to 90±5 s−1 and at 23±2° C.;
- and
- wherein the crosslinkable polyester oligomer(s) is ≦80% by weight soluble in water throughout a pH range of from 2 to 10, and has an acid value in the range of from 0 to 90 mg KOH/g.
5 more elements
An aqueous coating composition comprising:
- i) 3 to 26% of a crosslinkable oligomer(s) by weight of the composition of which at least 52 wt % is an ambient temperature crosslinkable water-dispersible polyester oligomer(s);
- ii) 0 to 6.5% of a non-crosslinkable oligomer(s) by weight of the composition;
- iii) 10 to 56% of dispersed polymer(s) by weight of the composition, said dispersed polymer(s) having a measured weight average molecular weight ≧120,000 Daltons;
- iv) 0 to 25% 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%;
- and
- 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 thumb hard time of ≦48 hours at 23±2° C.;
- iv) a tack-free time of ≦20 hours at 23±2° C.;
- and
- v) an equilibrium viscosity of ≦3,000 Pa.s, at any solids content when drying in the range of from 20 to 55% by weight of the composition, using any shear rate in the range of from 9±0.5 to 90±5 s−1 and at 23±2° C.;
- and
- wherein the crosslinkable polyester oligomer(s) is 80% by weight soluble in water throughout a pH range of from 2 to 10;
- and has an acid value in the range of from 0 to 90 mg KOH/g.
14 more elements
An aqueous coating composition comprising an ambient temperature crosslinkable water-dispersible polyester oligomer(s) and a dispersed polymer(s) having a measured weight average molecular weight <120,000 Daltons where the ratio of crosslinkable polyester oligomer(s) to the dispersed polymer(s) is in the range of from 90:10 to 20:80, and from 0 to 25% of co-solvent by weight of the composition, and 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 thumb hard time of ≦48 hours at 23±2° C.;
- iv) a tack-free time of ≦20 hours at 23±2° C.;
- and
- v) an equilibrium viscosity of ≦3,000 Pa.s, at any solids content when drying in the range of from 20 to 55% by weight of the composition, using any shear rate in the range of from 9±0.5 to 90±5 s−1 and at 23±2° C.;
- and;
- wherein the crosslinkable polyester oligomer(s) is ≦80% by weight soluble in water throughout a pH range of from 2 to 10, and has an acid value in the range of from 0 to 90 mg KOH/g with the proviso that the dispersed polymer(s) is a vinyl polymer and has a solid viscosity >150 Pa.s, as determined from an 80% by weight solids solution of the dispersed polymer(s) in at least one of the solvents selected from the group consisting of N-methylpyrrolidone, n-butylglycol and mixtures thereof, using a shear ate of 90±5 s−1 and at 50±2° C.
5 more elements
An aqueous coating composition comprising an ambient temperature crosslinkable water-dispersible polyester oligomer(s) and a dispersed polymer(s) having a measured weight average molecular weight <120,000 Daltons where the ratio of crosslinkable polyester oligomer(s) to the dispersed polymer(s) is in the range of from 90:10 to 20:80, and from 0 to 25% of co-solvent by weight of the composition, and 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 thumb hard time of ≦48 hours at 23±2° C.;
- iv) a tack-free time of ≦20 hours at 23±2° C.;
- and
- v) an equilibrium viscosity of ≦3,000 Pa.s, at any solids content when drying in the range of from 20 to 55% by weight of the composition, using any shear rate in the range of from 9±0.5 to 90±5 s−1 and at 23±2° C.;
- and;
- wherein the crosslinkable polyester oligomer(s) is ≦80% by weight soluble in water throughout a pH range of from 2 to 10, and has an acid value in the range of from 0 to 90 mg KOH/g with the proviso that the dispersed polymer(s) has a solution viscosity ≧250 Pa.s, as determined from an 80% by weight solids solution of the dispersed polymer(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 with the further proviso that the crosslinkable water-dispersible polyester oligomer(s) is selected from the group consisting of such polyester oligomer(s) that are self-crosslinkable, crosslinkable by autooxidation, crosslinkable by Schiff base crosslinking or crosslinkable by silane condensation and with the further proviso that said polyester oligomer(s) has a solution viscosity ≦150 Pa.s, as determined from a 80% by weight solids solution of the crosslinkable polyester oligomer(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.
5 more elements
An aqueous coating composition comprising:
- i) 14 to 40% of ambient temperature crosslinkable water-dispersible oligomer(s) by weight of crosslinkable oligomer(s), non-crosslinkable oligomer(s) and dispersed polymer(s) of which at least 52 wt % is crosslinkable polyester oligomer(s);
- ii) 0 to 10% of a non-crosslinkable oligomer(s) by weight of crosslinkable oligomer(s), non-crosslinkable oligomer(s) and dispersed polymer(s);
- iii) 50 to 85% of dispersed polymer(s) by weight of crosslinkable oligomer(s), non-crosslinkable oligomer(s) and dispersed polymer(s);
- said dispersed polymer(s) having a measured weight average molecular weight ≧120,000 Daltons and
- where i)+ii)+iii)=100%, and
- iv) 0 to 25% of co-solvent by weight of the composition, said composition when drying to form a coating having 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 thumb hard time of ≦48 hours at 23±2° C.;
- iv) a tack-free time of ≦20 hours at 23±2° C.;
- and
- v) an equilibrium viscosity of ≦3,000 Pa.s, at any solids content when drying in the range of from 20 to 55% by weight of the composition, using any shear rate in the range of from 9±0.5 to 90±5 s−1 and at 23+2° C.;
- and wherein the crosslinkable polyester oligomer(s) is ≦80% by weight soluble in water throughout a pH range of from 2 to 10, and has an acid value in the range of from 0 to 90 mg KOH/g.
10 more elements
An aqueous coating composition comprising:
- i) 3 to 26% of a crosslinkable oligomer(s) by weight of the composition of which at least 52 wt % is an ambient temperature crosslinkable water-dispersible polyester oligomer(s);
- ii) 0 to 6.5% of a non-crosslinkable oligomer(s) by weight of the composition;
- iii) 10 to 56% of dispersed polymer(s) by weight of the composition, said dispersed polymer(s) having a measured weight average molecular weight <120,000 Daltons;
- iv) 0 to 25% 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%;
- and
- 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 thumb hard time of ≦48 hours at 23±2° C.;
- iv) a tack-free time of ≦20 hours at 23±2° C.;
- and
- v) an equilibrium viscosity of ≦3,000 Pa.s, at any solids content when drying in the range of from 20 to 55% by weight of the composition, using any shear rate in the range of from 9±0.5 to 90±5 s−1 and at 23±2° C.;
- and
- wherein the crosslinkable polyester oligomer(s) is 80% by weight soluble in water throughout a pH range of from 2 to 10, and has an acid value in the range of from 0 to 90 mg KOH/g with the proviso that the dispersed polymer(s) is vinyl polymer and has a solution viscosity >150 Pa.s, as determined from an 80% by weight solids solution of the dispersed polymer(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.
13 more elements
An aqueous coating composition comprising:
- i) 3 to 26% of a crosslinkable oligomer(s) by weight of the composition of which at least 52 wt % is an ambient temperature crosslinkable water-dispersible polyester oligomer(s);
- ii) 0 to 6.5% of a non-crosslinkable oligomer(s) by weight of the composition;
- iii) 10 to 56% of dispersed polymer(s) by weight of the composition, said dispersed polymer(s) having a measured weight average molecular weight ≧120,000 Daltons;
- iv) 0 to 25% 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%;
- and
- 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 thumb hard time of ≦48 hours at 23±2° C.;
- iv) a tack-free time of ≦20 hours at 23±2° C.;
- and
- v) an equilibrium viscosity of ≦3,000 Pa.s, at any solids content when drying in the range of from 20 to 55% by weight of the composition, using any shear rate in the range of from 9±0.5 to 90±5 s−1 and at 23±2° C;
- and
- wherein the crosslinkable polyester oligomer(s) is ≦80% by weight soluble in water throughout a pH range of from 2 to 10, and has an acid value in the range of from 0 to 90 mg KOH/g with the proviso that the dispersed polymer(s) has a solution viscosity ≧250 Pa.s, as determined from an 80% by weight solids solution of the dispersed polymer(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 with the further proviso that the crosslinkable water-dispersible polyester oligomer(s) is selected from the group consisting of such polyester oligomer(s) that are self-crosslinkable, crosslinkable by autooxidation, crosslinkable by Schiff base crosslinking or crosslinkable by silane condensation and with the further proviso that said polyester oligomer(s) has a solution viscosity ≦150 Pa.s, as determined from a 80% by weight solids solution of the crosslinkable polyester oligomer(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.
13 more elements
Dependencies are inferred from the claim text.