Control of recoating time for water dilutable alkyd surface coating compositions
AssigneeEnvirosol Systems International, Ltd.
InventorsRamesh C. Vasishth, Robert S. Wang
Life of this patent
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Abstract
Duration of the initial interval when a clear varnish can be recoated without wrinkling can be changed, the varnish being a water dilutable alkyd resin formulation in a water-organic polar solvent system. The recoating interval is changed by changing the weight ratio of water to organic polar solvent in the solvent system, with increases in the weight ratio of water to organic polar solvent causing increases in the duration of the interval and decreases in the weight ratio providing decreases therein. Compositions utilizing the above method having increased duration of the initial recoating interval are described.
Claims9
A protective coating composition having a convenient recoating time comprising:
- a water dilutable alkyd resin;
- drier for said resin;
- at least one organic polar solvent for said resin;
- and water;
- the weight ratio of water to organic solvent being sufficiently high to increase the duration of the initial interval when recoating without wrinkling of the coating may be executed, but insufficiently high to cause resin precipitation out of solution or discontinuities in the coating, the weight ratio of water to organic solvent being at least about 5.0 to 1.0.
A method for changing the duration of the initial interval when a clear varnish can be recoated without wrinkling, said clear varnish containing a water dilutable alkyd resin in a water-organic polar solvent system, said method comprising changing the weight ratio of water to organic polar solvent in said solvent system such that said weight ratio is sufficiently high to increase the duration of said interval, but insufficiently high to cause resin precipitation out of solution or discontinuities in the coating, said weight ratio being at least about 5.0 to 1.0, wherein increases in said weight ratio provide increases in the duration of said interval and decreases in said weight ratio provide decreases therein.
Dependencies are inferred from the claim text.