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US 8,076,378 B2Granted
Dispersants
AssigneeThe Lubrizol Corporation
InventorDean Thetford
Life of this patent
Estimating the term…
Abstract
A dispersant comprising a polyester chain obtainable by polymerising a hydroxy carboxylic acid or lactone thereof such as ε-caprolactone with a cyclic alkylene carbonate such as 5,5-dimethyltrimethylene carbonate. The dispersant may be in the form of a phosphate ester where the polyester chain is reacted with a phosphating agent such as polyphosphoric acid or the polyester chain may be attached to a polyamine or polyimine such as polyethyleneimine.
Claims20
A dispersant of formula 1, including salts thereof;
- T-X-(A)m-(B)n-Z 1
- wherein T is alkyl or alkenyl;
- X is a direct bond or a divalent bridging group;
- A is the residue of one or more optionally substituted hydroxy(C1-50-alkylene)carboxylic or hydroxy(C2-50-alkenylene)carboxylic acids or lactones thereof;
- B is the residue of one or more cyclic trimethylene carbonate substituted by C1-6-alkyl, cycloalkyl, C2-6-alkenyl, C1-6-alkyloxy-C1-6-alkyl or C2-6-alkenyloxy-C1-6-alkyl groups;
- Z is a phosphate group;
- m and n are positive integers;
- -(A)m-(B)n— represents a random copolymer of the residue of A and the residue of B;
- and
- m+n is from 2 to 200.
7 more elements
A dispersant of formula 1, including salts thereof;
- T-X-(A)m-(B)n—Z 1
- wherein T is the residue of a polyalkyleneglycolmonoalkylether,
- X is a direct bond or a divalent bridging group;
- A is the residue of one or more optionally substituted hydroxy(C1-50-alkylene)carboxylic or hydroxy(C2-50-alkenylene)carboxylic acids or lactones thereof;
- B is the residue of one or more cyclic trimethylene carbonate substituted by C1-6-alkyl, cycloalkyl, C2-6-alkenyl, C1-6-alkyloxy-C1-6-alkyl or C2-6-alkenyloxy-C1-6-alkyl groups;
- Z is a phosphate group;
- m and n are positive integers;
- -(A)m-Bn— represents a random copolymer of the residue of A and the residue of B;
- and
- m+n is from 2 to 200.
7 more elements
Dependencies are inferred from the claim text.