Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1998-11-04
2000-05-30
Jagannathan, Vasu
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
523160, 528419, C08G 6502, C08G 65327, C08L 7102, C09D 1102
Patent
active
060692103
DESCRIPTION:
BRIEF SUMMARY
This application is the national phase of international application PCT/GB97/00930 filed Apr. 2, 1997.
The present invention relates to the use of phosphate esters of propylene oxide/ethylene oxide block co-polymers as dispersants for particulate solids in an organic medium and to compositions comprising such dispersants and particulate solids in an organic medium.
Phosphate esters of propylene oxide/ethylene oxide block copolymers (hereinafter PO/EO polymers) where the ester group is attached to EO are already known to the art. The known phosphate esters include both the alkyl end-capped PO/EO block copolymers and also EO/PO/EO block copolymers carrying phosphate ester groups at both ends of the polymer.
U.S. Pat. No. 4,613,445 discloses phosphate esters of end-capped block copolymers of formula AOPOEO wherein A is inter alia C.sub.1-24 -alkyl and their use as corrosion inhibitors. This patent also discloses compositions comprising the phosphate esters, a buffer and an alcohol.
CA 2027302 discloses aqueous coolant compositions containing phosphate esters derived from fatty alcohol PO/EO polymers and EO/PO/EO block copolymers.
U.S. Pat. No. 3,658,959 discloses carbamate insecticidal compositions containing phosphate esters of EO/PO/EO block copolymers and aqueous solutions or dispersions derived therefrom.
DE 3542441 discloses bis-monophosphate esters of EO/PO/EO block copolymers and their use in the manufacture of plant protection formulations which are essentially solvent-free.
These publications disclose either aqueous compositions containing the phosphate esters of PO/EO copolymers or concentrates for use in aqueous systems and none envisage the use of such esters to disperse particulate solids, especially pigments, in non-aqueous media.
It has now been found that phosphate esters of PO/EO block copolymers wherein the phosphate ester is attached to EO are useful for dispersing particulate solids in organic liquids and especially in the preparation of mill bases for use in paints and printing inks.
According to a first aspect of the invention there is provided a composition of a particulate solid and a dispersant which is a phosphate ester of a compound of formula 1: ##STR2## including salts thereof. wherein
Y is a group RO-- or a group H--(EO).sub.q ;
R is C.sub.1-6 -alkyl;
m and q are each, independently, from 5 to 50; and
n is from 5 to 70.
In a second aspect of the invention there is provided a composition comprising a dispersion of a particulate solid in an organic medium containing a dispersant which is a phosphate ester of a compound of formula 1.
In a third aspect of the invention there is provided a non-aqueous mill-base comprising a particulate solid, a film-forming resin, an organic medium and a dispersant which is a phosphate ester of a compound of formula 1.
In a fourth aspect of the invention there is provided the use of a phosphate ester of a compound of formula 1 to disperse a particulate solid in an organic medium, especially a mill base.
The organic medium is preferably an organic liquid containing not greater than 50%, more preferably not greater than 20% and especially not greater than 10% by weight water. It is especially preferred that the organic medium is substantially free from water.
When Y is the group RO--, the dispersant is a phosphate ester of an end-capped PO/EO block copolymer which preferably contains either 1 or 2 groups of formula RO(PO).sub.n (EO).sub.m -- attached to each phosphorus atom and especially mixtures thereof.
When Y is in the group H--(EO).sub.q the compound of formula 1 is a diol and the dispersant is a phosphate ester which preferably contains a phosphate group at each end of the diol. It is also preferred that each phosphorus atom forms an ester linkage with either 1 or 2 diols of formula H--(EO).sub.q (PO).sub.n (EO).sub.m --H and it is especially preferred that the dispersant is a mixture of such esters.
R may be linear or branched but is preferably linear and is especially methyl.
When Y is the group RO--, n and m are preferably and independently fro
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Cartridge David John
Thetford Dean
Jagannathan Vasu
Shosho Callie E.
Zeneca Limited
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