Dispersions containing polyether dispersants
View Patent ↗A dispersion comprising a particulate solid, a polar organic liquid and a dispersant of formula (1) wherein R is optionally substituted C 4-50 -hydrocarbyl; X is —O—, —S— or —NR 2 —; R 1 is hydrogen or C 1-6 , -alkyl which may be linear or branched; R 2 is hydrogen or C 1-6 , alkyl which may be linear or branched or a group —(C 2 H 4 O) n (AO) p —R 1 ; AO is alkyleneoxy containing 3 or more carbon atoms; n is 0 to 30; p is 4 to 100; and p>n; and a is from 1 to 3. Preferred compounds are where R 1 is hydrogen, X is —O— and a is 1 and R is the residue of 2-naphthol.
1. A dispersion comprising a particulate solid, a polar organic liquid optionally containing up to 10% by weight water and a dispersant of formula 1
RX—(C 2 H 4 O) n (AO) p —R 1 ] a Formula 1
wherein
R is optionally substituted C 4-50 -hydrocarbyl;
X is —O— or —S—;
R 1 is hydrogen or C 1-6 -alkyl which may be linear or branched;
AO is alkyleneoxy containing 3 or more carbon atoms;
n is zero;
p is 4 to 100; and
p>n; and
a is 1.
2. A dispersion as claimed in claim 1 wherein X is —O—.
3. A dispersion as claimed in either claim 1 or claim 2 wherein R 1 is hydrogen.
4. A dispersion as claimed in claim 1 or claim 2 wherein R is 2-naphthyl.
5. A dispersion is claimed in claim 1 or claim 2 wherein AO is 2-methylethoxy.
6. A dispersion as claimed in claim 1 or claim 2 wherein p is not greater than 80.
7. A millbase comprising a particulate solid, a polar organic liquid, optionally containing up to 10% by weight water, a film-forming binder resin and a dispersant of formula 1
RX—(C 2 H 4 O) n (AO) p —R 1 ] a Formula 1
wherein
R is optionally substituted C 4-50 -hydrocarbyl;
X is —O— or —S—;
R 1 is hydrogen or C 1-6 -alkyl which may be linear or branched;
AO is alkyleneoxy containing 3 or more carbon atoms;
n is zero;
p is 4 to 100; and
p>n; and
a is 1.
8. A paint or ink comprising a particulate solid, a polar organic liquid, optionally containing up to 10% be weight water, a film-forming binder resin and a dispersant of formula 1.
RX—(C 2 H 4 O) n (AO) p —R 1 ] a Formula 1
wherein
R is optionally substituted C 4-50 -hydrocarbyl;
X is —O— or —S—;
R 1 is hydrogen or C 1-6 -alkyl which may be linear or branched;
AO is alkyleneoxy containing 3 or more carbon atoms;
n is zero;
p is 4 to 100; and
p>n; and
a is 1.
9. A composition comprising a particulate solid selected from the group consisting of pigments, extenders, fillers, solids for oil-based and invert emulsion drilling muds, dirt and solid particles in dry cleaning fluids, ceramic materials, magnetic materials, biocides, agrochemicals and pharmaceuticals and a dispersant of formula 1.
RX—(C 2 H 4 O) n (AO) p —R 1 ] a Formula 1
wherein
R is optionally substituted C 4-50 -hydrocarbyl;
X is —O— or —S—;
R 1 is hydrogen or C 1-6 -alkyl which may be linear or branched;
AO is alkyleneoxy containing 3 or more carbon atoms;
n is zero;
p is 4 to 100; and
p>n; and
a is 1.