Crushed foam coating
AssigneeRohm and Haas Company
InventorsNader N. Kamel, Debra A. Kline, Paul Nedwick
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Abstract
Provided is a process for producing a coating on a substrate comprising one or more steps of crushing a dried layer of a foamed aqueous coating composition, wherein the aqueous coating composition comprises a collection of multi-stage copolymer particles having a weight average diameter of 2-20 μm, wherein said multi-stage copolymer particles comprise a core having a glass transition temperature (Tg) of 20° C. or less. Also provided is a coated substrate made by that process.
Claims4
A process for producing a coating on a substrate comprising one or more steps of crushing a dried layer of a foamed aqueous coating composition made by a process comprising:
- (a) introducing gas into the aqueous coating composition to produce a wet foam,
- (b) applying a layer of the wet foam to a substrate such that the layer has a thickness of from 5 μm to 70 μm,
- (c) drying the layer of wet foam to a water content of 2% to 20% by weight, to produce a layer of dried foam, and
- (d) crushing the layer of dried foam to produce the layer of crushed dried foam, wherein the aqueous coating composition comprises one or more binder polymers and a collection of multi-stage copolymer particles having a core and a shell, having a weight average diameter of 2 to 20 μm, wherein said multi-stage copolymer particles are multi-stage graded refractive index (GRIN) copolymer particles having a K10 value of less than 1.9E+10 N/m2 and a W20 of 80% or higher, wherein the core has a glass transition temperature (Tg) of 20° C. or less, wherein the shell has a glass transition temperature (Tg) of more than 20° C.
Dependencies are inferred from the claim text.