US 12,753,321 B2Granted

Aqueous dispersion of polymer particles, microspheres, and colloidal silica particles

AssigneesDow Global Technologies LLC, Rohm and Haas Company

InventorsCaifeng Wang, Jianming Xu, Kok Chiew Poh, Yuehan Hu, Tao Wang, Juan F. Callejas, Philip R. Harsh, James C. Bohling, Andrew J. Swartz, Partha S. Majumdar, Joseph Tanzer

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Abstract

The present invention is a composition comprising an aqueous dispersion of polymer particles, polymeric organic crosslinked microspheres, and colloidal silica particles. The composition is useful in coating compositions for exterior applications to achieve a balance of excellent dirt pickup resistance and durability performance under accelerated testing conditions.

Claims7

Dependent claims

A composition comprising an aqueous dispersion of a) 10 to 60 weight percent, based on the weight of the composition, polymer particles having a z-average particle size in the range of from 70 nm to 550 nm and a calculated Tg in the range of from −10° C. to 50° C.;

b) 10 to 40 weight percent, based on the dry weight percent of the composition, polymeric organic crosslinked microspheres having a median weight average (D50) particle size in the range of from 0.7 μm to 30 μm;
and c) colloidal silica particles having a z-average particle size in the range of from 5 nm to 150 nm;
wherein the weight-to-weight ratio of the colloidal silica particles to the polymer particles is in the range of from 5:95 to 35:65.

Dependencies are inferred from the claim text.