Patent ID: 8088862

Claim:
A stabilized dispersion of inorganic nanoparticles, the dispersion comprising inorganic nanoparticles and a stabilizer in a dispersion medium, wherein the stabilizer includes a combination of (i) a modified polyurethane and (ii) a modified urea, wherein the modified polyurethane is of the general formula (I): in which the radicals R 1 , R 2 , R 3 and R 4 , are each independently a radical of the formula: in which x is 4, y is 1, and z is 5 to 25; and wherein the modified urea is of the general formula (II) or the general formula (II′), with general formula (II) being: in which R′ is one of the following radicals: —C p H 2p — where p=2 to 12; —(C q H 2q —O—C q H 2q ) r — where q=2 to 4 and r=1 to 10; where R″ is H or CH 3 ; and and in which R 5 and R 6 are each independently one of the following radicals: an n-alkyl radical or an isoalkyl radical having 4 to 22 C atoms; an alkenyl radical having 3 to 18 C atoms; a cycloalkyl radical; an aralkyl radical; a radical of the formula C m H 2m+1 (O—C n H 2n ) x —, where m is 1 to 22, n is 2 to 4 and x is 1 to 15; a radical of the formula C m H 2n+1 (OOC—C y H 2y ) x —, where m is 1 to 22, x is 1 to 15 and v is 4 or 5; a radical of the formula Z—C 6 H 4 (O—C n H 2n ) x —, where n is 2 to 4, x is 1 to 15 and Z is an alkyl radical having 1 to 12 C atoms; and with general formula (II′) being: in which R 7 and R 8 are each independently one of the following radicals: where n′=7 to 16 or