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Dispersing agents
| Details |
Inventors: Hauxwell, Frank; Stansfield, James F.; Topham, Arthur;
Assignee: Imperial Chemical Industries Limited (London, GB)
Primary Examiner: Rutledge; L. Dewayne
Assistant Examiner: Shechan; John P.
Attorney, Agent or Firm: Cushman, Darby & Cushman
Dispersing agents comprising the adducts of one or more compounds from each of the following classes: (a) an organic compound containing two or more isocyanate groups, (b) an organic compound containing two or more groups which are reactive with isocyanate groups, and (c) a compound of the formula: Z--X--E(T--D).sub.n-1 Q wherein Z represents --OH or --NHR, wherein R is alkyl; X is optionally substituted alkylene; T is alkylene; N is a positive integer; Q is optionally substituted alky; And E is a ##STR1## group wherein R' is hydrogen or alkyl, and D is a ##STR2## group provided that only one of E and D is connected to T via the carbon atom of the carbonyl group present in D and E, and at least one of the group represented by X, T, Q, R and R.sup.1 contains a carbon chain having more than 4 carbon atoms, a process for the manufacture of the said dispersing agents, and their use in the preparation of finely divided dispersions of solids in organic liquids. |
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DETAILED DESCRIPTION We claim: 1.
Dispersing agents comprising the reaction product formed by reacting together one or more compounds from each of the following classes in the presence of an inert organic solvent at a temperature up to the boiling point of the reaction medium: (a) an organic diisocyanate selected from hexamethylene diisocyanate, isophorone diisocyanate, 4,4'-diisocyanatodiphenylamine, 2:4-diisocyanatotoluene and 2:6-diisocyanatotoluene, (b) polymethylene glycols containing from 5 to 10 carbon atoms, (c) a compound of the formula: Z--X--E--T--D).
sub.
n-1 Q wherein Z is-- OH or-- NHR wherein R is alkyl X is alkylene or a halogeno derivative thereof T is alkylene n is an integer from 1 to 8 Q is alkyl or hydroxyalkyl ##STR21## and E is ##STR22## wherein R.
sup.
1 is R or H provided that only one of E and D is connected to T via the carbon atom of the carbonyl group present in D and E and at least one of the groups represented by X, T, Q and R contains a carbon chain having more than four carbon atoms.
2.
The dispersing agents as claimed in claim 1 wherein compound (b) is 1:6 hexane diol.
3.
The dispersing agents as claimed in claim 1 wherein compound (a) is an 80:20 mixture of 2:4 and 2:6 diisocyanatotoluene.
4.
The dispersing agents as claimed in claim 1 wherein n is 1.
5.
The dispersing agents as claimed in claim 1 wherein R contains from 8 to 18 carbon atoms and Q contains from 12 to 18 carbon atoms.
6.
The dispersing agents as claimed in claim 1 which are reaction products of an 80:20 mixture of 2:4 and 2:6 diisocyanato toluene, an aliphatic diol containing at least 5 carbon atoms and a compound of the formula: Z--X.
sup.
1 --E--Q.
sup.
1 wherein Z and E have the meanings stated in claim 8, X.
sup.
1 is alkylene or halogeno alkylene having a chain of at least 10 carbon atoms and joined to E through a terminal -- CH.
sub.
2 -- group contained in X.
sup.
1, and Q.
sup.
1 is alkyl containing at least 12 carbon atoms.
7.
A dispersing agent as claimed in claim 1 which is a reaction product of 80:20 mixture of 2:4 and 2:6 diisocyanatotoluene, 1:6 hexanediol and a compound of the formula ##STR23## 8
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