Titanium oxide spacing by SIP

摘要

A method of making a titanium oxide-containing coating composition comprises attaching an initiator to a pretreated titanium oxide to form an initiator/pretreated titanium oxide complex. The pretreated titanium oxide includes a plurality of pretreated titanium oxide particles which are titanium oxide particles that are pretreated with at least one metal oxide. The initiator/pretreated titanium oxide complex is contacted with a polymerizable unsaturated monomer such that a polymeric encapsulate forms on the initiator/pretreated titanium oxide particles to form polymeric encapsulated titanium oxide particles.

主权项

1. An encapsulated titanium oxide for coating compositions, the encapsulated titanium oxide consisting of a plurality of pretreated titanium oxide particles, residues of an initiator attached to surfaces of the pretreated titanium oxide particles, and a polymeric layer disposed over the pretreated titanium oxide particles and the residues of the initiator, the polymeric layer consisting of polymer chains that extend from surfaces of the pretreated titanium oxide particles, the polymer chains consisting of residues of a hydrophilic monomer and optionally residues of a hydrophobic monomer, wherein:
the pretreated titanium oxide particles are titanium oxide particles pretreated with at least one metal oxide; the initiator has the following formula
X1—R1—X2 wherein:X1 is a leaving group that is replaced by chemically active functional groups on the surfaces of the pretreated titanium oxide particles;R1 is a C6-C20 hydrocarbon-containing group consisting of components selected from the group consisting of phenyl groups, C1-C10 alkyl groups, C1-C10 allyl, ester, nitrile, benzyl, ether, C1-C4 epoxy, hydroxyl, vinyl, and combinations thereof; andX2 is a halogen.