US 10,329,390 B2 · Polyurethane nanocomposites

Abstract

Polyurethane nanocomposites are provided which include a polyurethane and surface modified silica nanoparticles covalently bound into the polyurethane. High loadings in excess of 30% may be achieved. In some embodiments, the silica nanoparticles are covalently bound to the polyurethane polymer through a linkage derived from a surface-modifying compound comprising a silane functional group and a polyol segment. In some embodiments the polyurethane nanocomposite may be provided as a tape or film. In addition, precursors for a polyurethane nanocomposites are provided comprising: a first polyol and surface modified silica nanoparticles dispersed within the first polyol. In some embodiments, the silica nanoparticles are surface-modified by reaction with a surface-modifying compound comprising a silane functional group and a polyol segment derived from a second polyol, which may be the same or different from the first polyol.

Claims19

Dependent claims

A method comprising the steps of:

a) mixing precursor for a polyurethane nanocomposite with an isocyanate polyurethane precursor to make a reactive mixture;
b) applying the reactive mixture to a substrate;
and
c) curing the reactive mixture;
wherein the precursor for a polyurethane nanocomposite comprises:
x) a first polyol, and
y) surface modified silica nanoparticles dispersed within the first polyol, where said nanoparticles are surface-modified by reaction with a surface-modifying compound comprising a second polyol to which a silane group is added by reaction with a compound comprising a silane or silane-generating group and an isocyanate group, wherein the reaction with the compound comprising the silane or silane-generating group and the isocyanate group occurs prior to making the reactive mixture in step a).

4 more elements

Dependencies are inferred from the claim text.

Polyurethane nanocomposites

Life of this patent

Polyurethane nanocomposites

Life of this patent

Abstract

Claims19