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US 2023/0145320 A1Published application
Method for preparing coating composition with improved color retention
AssigneeRohm and Haas Company
InventorsJuan F. Callejas, Melinda L. Einsla, Jeffrey J. Sobczak, Mark D. Westmeyer
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Abstract
The present invention relates to a process for preparing a blend of comprising an aqueous dispersion of polymer particles, a PMHS, an opacifying pigment, and an extender. The blend of the present invention is useful in exterior paint applications, especially where retention of color in the painted substrate is important.
Claims13
A method for forming a blend comprising an aqueous dispersion of polymer particles, a polymethylhydrosiloxane (PMHS), an opacifying pigment, and an extender;
- wherein the order of addition comprises the steps of either:
- a) mixing the PMHS with the aqueous dispersion of polymer particles to form a polymethylhydrogensiloxane/polymer particle blend;
- then mixing the polymethylhydrogensiloxane/polymer particle blend with the opacifying pigment and the extender in any order;
- or
- b) mixing the opacifying pigment with the aqueous dispersion of polymer particles to form an opacifying pigment/polymer particle blend;
- then mixing the opacifying pigment/polymer particle blend with PMHS and the extender in any order;
- or
- c) mixing the extender with the aqueous dispersion of polymer particles to form an extender/polymer particle blend;
- then mixing the extender/polymer particle blend with PMHS and the opacifying pigment in any order;
- or
- d) adding the polymethylhydrogensiloxane to a blend comprising the aqueous dispersion of polymer particles, the pigment, and the extender;
- wherein the PMHS is represented by the following formula:
- where each R1 is independently H or SiMe3;
- R2 is CH3 or phenyl;
- and R3 is C1-C18-alkyl, C1-C18-alkoxy, or phenyl;
- m is from 0 to 199 and n is from 1 to 200.
13 more elements
Dependencies are inferred from the claim text.