Fluorosurfactants
AssigneeSphere Fluidics Limited
InventorsXin Li, Clive A. Smith, Alexandra Clay, Frank F. Craig
Life of this patent
Estimating the term…
Abstract
The present invention provides a surfactant having a formula selected from the group consisting of: B—((X)x—(CH2)a-A)n(VI), (A-(CH2)a—(X)x—B—(X)x—(CH2)a-A)n (IV), (A-(CH2)a—(X)x—B)n (V), and (B)n—(X)x—(CH2)a-A (VII), wherein A is a perfluoropolyether; a is a positive integer; X is either a covalent bond or a linking group; x is a positive integer; B is a polyalkylene oxide unit; n is a positive integer greater than 1 and, in compounds comprising more than one A, B, X, a and x, each may be the same or different. The present invention also relates to methods of making such surfactants, uses of such surfactants and emulsions comprising such surfactants.
Claims26
A surfactant of formula (II),
- A-(CH2)a—(X)x—B—(X)x—(CH2)a-A (II),
- wherein,
- each A is a perfluoropolyether and comprises a repeat unit of the formula:
- —[CF(CF3)CF2O]b—,
- wherein h is a positive integer;
- a is a positive integer;
- X is either a covalent bond or a linking group;
- x is a positive integer;
- B is a polyalkylene oxide unit;
- and
- each A, X, a, and x may be the same or different.
A composition comprising a surfactant, wherein the surfactant has a formula selected from the group consisting of
- A-(CH2)a—(X)x—B—(X)x—(CH2)a-A (II),
- wherein,
- each A is a perfluoropolyether and comprises a repeat unit of the formula:
- —[CF(CF3)CF2O]b—,
- wherein h is a positive integer;
- a is a positive integer;
- X is either a covalent bond or a linking group;
- x is a positive integer;
- B is a polyalkylene oxide unit;
- and
- each A, X, a and x may be the same or different.
A method of preparing an emulsion comprising:
- (i) preparing an aqueous phase;
- (ii) preparing an oil phase;
- and
- (iii) mixing said aqueous phase, said oil phase and a surfactant having a formula selected from the group consisting of:
- A-(CH2)a—(X)x—B—(X)x—(CH2)a-A (II),
- wherein,
- each A is a perfluom olyether and comprises a repeat unit of the formula:
- —[CF(CF3)CF2O]b—
- wherein b is a positive integer;
- a is a positive integer;
- X is either a covalent bond or a linking group;
- x is a positive integer;
- B is a polyalkylene oxide unit;
- and
- A, X, a and x may be the same or different, to form said emulsion.
Dependencies are inferred from the claim text.