Method for applying a coating composition to a substrate
AssigneesRohm and Haas Company, Dow Global Technologies LLC
InventorsEric C. Greyson, Joy A. Gallagher, Richard Cooper
Life of this patent
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Abstract
The present invention relates to a method comprising the steps of a) applying a 0.1-mm to 2-mm thick layer of a pigmented coating composition onto a cement, concrete, or asphalt substrate, and b) allowing the coating to composition to dry. The method of the present invention is useful for preparing a traffic paint with improved color retention and durability.
Claims17
A method comprising the steps of a) applying a 0.1-mm to 2-mm thick layer of a pigmented coating composition onto a cement, concrete, or asphalt substrate, and b) allowing the coating composition to dry;
- wherein the pigmented coating composition comprises an aqueous dispersion of 1) first polymer particles having a calculated Tg in the range of from −25° C. to 50° C.;
- 2) second polymer particles having a calculated Tg in the range of from 30° C. to 110° C.;
- 3) extender particles;
- 4) pigment particles;
- and 5) a base which is ammonia or a volatile amine or a salt thereof;
- with the proviso that the second polymer particles have a Tg of at least 20° C. higher than the first polymer particles, wherein, based on the weight of the composition:
- the first and second polymer particles together have a solids content in the range of from 10 to 20 weight percent;
- the extender particles have a solids content in the range of from 45 to 70 weight percent;
- the pigment particles have a solids content in the range of from 3 to 15 weight percent;
- and
- the composition has a total solids content in the range of from 60 to 85 weight percent;
- wherein the w/w ratio of the first polymer particles to the second polymer particles is in the range of from 30:70 to 90:10;
- wherein the first and second polymer particles consist of acrylic or styrene-acrylic polymer particles.
A method comprising the steps of a) applying a 0.1-mm to 2-mm thick layer of a pigmented coating composition onto a cement, concrete, or asphalt substrate, and b) allowing the coating composition to dry;
- wherein the pigmented coating composition comprises an aqueous dispersion of 1) first polymer particles having a calculated Tg in the range of from −25° C. to 50° C.;
- 2) second polymer particles having a calculated Tg in the range of from 30° C. to 110° C.;
- 3) extender particles;
- 4) pigment particles;
- and 5) a base which is ammonia or a volatile amine or a salt thereof;
- with the proviso that the second polymer particles have a Tg of at least 20 C° higher than the first polymer particles, wherein, based on the weight of the composition:
- the first and second polymer particles together have a solids content in the range of from 10 to 20 weight percent;
- the extender particles have a solids content in the range of from 45 to 70 weight percent;
- the pigment particles have a solids content in the range of from 3 to 15 weight percent;
- the composition has a total solids content in the range of from 60 to 85 weight percent;
- and
- wherein the w/w ratio of the first polymer particles to the second polymer particles is in the range of from 30:70 to 90:10;
- and
- wherein the first polymer particles are film-forming, and the second polymer particles are not film-forming.
Dependencies are inferred from the claim text.