Fluorochemical polymeric surfactants
Assignee3M Innovative Properties Company
InventorsMichael Terrazas, George Moore, Michael Sierakowski, Rudolf Dams
Life of this patent
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Abstract
Described are polymeric surfactants which include a fluorinated moiety and a non-fluorinated moiety where the fluorinated moiety contains two perfluoro-lower-alkyl sulfonamido segments in proximity to each other ; the surfactants provide more efficient and effective lowering of the surface tension of liquids and increase of wetting of a coating on a substrate surface.
Claims23
A polymeric surfactant of the formula:
- A(Mf)a(Mh)b-G
- wherein A is the residue of an initiator or hydrogen;
- Mf is a fluorinated monomer;
- Mh is a non-fluorinated monomer;
- G is a monovalent organic residue comprising the residue of a chain transfer agent,
- a represents units from 1 to 50;
- and b represents units from 1 to 50;
- which comprises the reaction product of
- (a) units of a fluorinated monomer of the formula
- wherein Rf is a C2-C5 fluoroalkyl group;
- R is alkyl or aryl;
- R2 is hydrogen or CH3;
- n is an integer of from 1 to 10;
- and
- (b) units of a non-fluorinated monomer of the formula
- CH2═C(R2)C(O)X—(Cn′H2n′)Y
- wherein X is O, N(R1) or S;
- R1 is hydrogen or a C1 to C4 alkyl group;
- R2 is as defined above;
- n′ is an integer from 0 to 20;
- and
- Y is a hydrogen when n′=0 or a hydrophilic group when n>0, and
- (c) G is the residue of a chain transfer agent.
A method of reducing the surface tension of a liquid comprising adding to said liquid a surfactant derived from a polymeric compound having two perfluorobutanesulfonamide segments in close proximity to one another and a molecular weight of between about 2,000 to about 100,000 grams/mole.
A method of increasing the wetting of a coating on a substrate surface comprising adding to a coating mixture a polymeric surfactant derived from a polymeric compound having two perfluorobutanesulfonamide segments in close proximity to one another and a molecular weight of between about 2,000 to about 100,000 grams/mole.
A fluorinate monomer of the formula
- wherein Rf is a C2 to C5 fluoroalkyl group;
- R is alkyl or aryl;
- R2 is hydrogen or CH3;
- n is an integer of from 1 to 10.
Dependencies are inferred from the claim text.