# US 5,700,395 A · Dispersants

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- Number: US 5,700,395 A
- Document ID: US5700395A
- Status: Granted
- Kind: A
- Application number: 08/525,725
- Filed: 1995-09-25
- Granted: 1997-12-23
- Earliest claimed: 1993-03-25
- Assignees: Zeneca Limited
- Inventors: Dean Thetford; John David Schofield
- Web page: https://patentgrep.com/patent/US5700395A

## CPC

- C09K 23/16: Amines or polyamines
- C09B 67/0085: {Non common dispersing agents}
- C09D 17/002: {in organic medium (C09D17/003, C09D17/004 take precedence)}
- Y10S 516/07: Organic amine, amide, or n-base containing
- Y10S 516/916: The compound contains repeating -OCnH2n-, i.e. repeating unsubstituted oxyalkylene
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09B: ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES {, e.g. PIGMENTS}; MORDANTS; LAKES (fermentation or enzyme using processes to synthesise a desired chemical compound C12P)
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A dispersant comprising a polyethyleneimine residue carrying polyester chains derived from a caprolactone and at least one other specified lactone or hydroxycarboxylic acid.

## Claims

### Claim 1

A dispersant comprising a polyethyleneimine residue carrying a plurality of poly(carbonylalkyleneoxy) chains each chain containing a plurality of repeat units derivable from 6-hydroxyhexanoic acid and at least one other hydroxycarboxylic acid selected from the group consisting of ricinoleic acid, 12-hydroxystearic acid, 12-hydroxydodecanoic acid, 5-hydroxydodecanoic acid, 5-hydroxydecanoic acid and 4-hydroxydecanoic acid; the weight ratio of units derivable from 6-hydroxyhexanoic acid to units derivable from the other hydroxycarboxylic acid or acids being in the range from 90:10 to 10:90, or a salt of said polyethyleneimine residue with an acid.

### Claim 2 (depends on 1)

A dispersant as claimed in claim 1 wherein the polyethyleneimine has an average molecular weight of from 10,000 to 50,000.

### Claim 3 (depends on 1, 2)

A dispersant as claimed in either claim 1 or claim 2 wherein the poly(carbonylalkyleneoxy) chains contain from 4 to 15 carbonylalkyleneoxy groups.

### Claim 4 (depends on 1)

A dispersant as claimed in claim 1 wherein the weight ratio of poly(carboxyalkyleneoxy) chains to polyethyleneimine is from 10:1 to 15:1.

### Claim 5 (depends on 1)

A dispersant as claimed in claim 1 wherein the salt is a quaternary ammonium salt.

### Claim 6 (depends on 1)

A dispersant as claimed claim 1 derived from 6-hydroxyhexanoic acid, ricinoleic acid and polyethyleneimine having a MW of from 10,000 to 50,000.

### Claim 7 (depends on 1)

A dispersant as claimed in claim 1 derived from 6-hydroxyhexanoic acid, 12-hydroxystearic acid and polyethyleneimine having a MW of from 10,000 to 50,000.

### Claim 8 (depends on 1)

A dispersion of a solid in an organic medium containing a dispersant as claimed in claim 1.

### Claim 9 (depends on 8)

A dispersion as claimed in claim 8 wherein the solid is a pigment, a filler, a magnetic material or an agrochemical.

### Claim 10 (depends on 8, 9)

A dispersion as claimed in either claim 8 or claim 9 wherein the organic medium is a polar organic liquid.