Clear coating compositions having low solvent content
AssigneeCovestro LLC
InventorsDaniel P. Wang, Kurt E. Best
Life of this patent
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Abstract
A coating composition can include an aliphatic polyisocyanate having an NCO % of greater than or equal to 6 wt % to less than 22 wt % based on ISO 11909:2007 combined with a polyaspartate at an equivalent ratio of from 0.9 to 5. The coating composition can also include a metal additive in an amount of from 0.03 wt % to 0.5 wt % based on a total weight of the coating composition. The coating composition can have a total solvent content of less than or equal to 200 g/L and has an average viscosity build rate of less than 0.5 KU/min. The coating composition cures to form a coating having a haze value of less than or equal to 5 haze units based on ASTM E430-19.
Claims20
A coating composition, comprising:
- an aliphatic polyisocyanate having an NCO % of greater than or equal to 6 wt % and less than 22 wt % based on ISO 11909:2007 combined with a polyaspartate at an equivalent ratio of from 0.9 to 5;
- and
- a metal additive in an amount of from 0.03 wt % to 0.5 wt % based on a total weight of the coating composition,
- wherein the coating composition has a total solvent content of less than or equal to 200 g/L, wherein the coating composition has an average viscosity build rate of less than 0.5 KU/min based on based on ISO 3219:2003, and wherein the coating composition cures to form a coating having a haze value of less than or equal to 5 haze units based on ASTM E430-19.
A method of making a coating composition, comprising:
- combining an aliphatic polyisocyanate having an NCO % of greater than or equal to 6 wt % and less than 22 wt % based on ISO 11909:2007 with a polyaspartate at an equivalent ratio of from 0.9 to 5 to form a reaction mixture;
- and
- adding a metal additive to the reaction mixture to form the coating composition,
- wherein the coating composition has a total solvent content of less than or equal to 200 g/L, wherein the coating composition has an average viscosity build rate of less than 0.5 KU/min based on ISO 3219:2003, and wherein the coating composition cures to form a coating having a haze value of less than or equal to 5 haze units based on ASTM E430-19.
Dependencies are inferred from the claim text.