Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1996-06-28
1999-10-12
Mulcahy, Peter D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524505, C08J 2904
Patent
active
059656590
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a fluorine-containing-oil-in-water emulsion comprising a polymeric surfactant, and a fluorine-containing-oil-in-water surface treatment composition comprising said emulsion. The surface treatment composition of the present invention can be suitably used as a textile treatment agent.
RELATED ART
Since a fluorine-containing oil such as a perfluoropolyether, a polychlrotrifluorostyrene and fluorocarbon can give a good feeling and a high water- and oil-repellency, it is frequently diluted with a fluorine-containing solvent to be used as a textile treatment agent.
However, recently, the solvent has been frequently substituted with water, in view of a fire and an environmental pollution, and a technique comprising dispersing a fluorine-containing oil in water for preparing a fluorine-containing oil emulsion has been required. For example, Japanese Patent Kokoku Publication No. 45616/1988 proposes to disperse a perfluoropolyether in water in the presence of a fluorine-containing surfactant, a hydrocarbon surfactant and a hydrophilic solvent. However, this proposal had a problem in view of the stability of the emulsion.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a surface treatment composition comprising a fluorine-containing-oil-in-water emulsion prepared by emulsifying a fluorine-containing oil and water, which composition is superior in stability.
Another object of the present invention is to provide a surface treatment composition having excellent initial water- and oil-repellency, abrasion resistance of the water- and oil-repellency and feeling, which composition can be used as a textile treatment agent.
The present invention provides a fluorine-containing-oil-in-water emulsion prepared by emulsifying a fluorine-containing oil in water in the presence of a polymeric surfactant of a graft copolymer or block copolymer having a fluorine-containing segment and a hydrophilic segment in a molecule.
The present invention also provides a surface treatment composition comprising said emulsion.
DETAILED DESCRIPTION OF THE INVENTION
The fluorine-containing segment in the polymeric surfactant in the present invention preferably comprises a perfluoropolyether group or a polymeric chain prepared by polymerizing a fluorine-containing monomer having at least one fluorine-containing group selected from the group consisting of a polyfluoroalkyl group, a polyfluoroalkenyl group and a perfluoropolyether group.
The hydrophilic segment preferably comprises a polyalkylene oxide group or a polymeric chain prepared by polymerizing a polyalkylene glycol (meth)acrylate.
The graft copolymer can be prepared by polymerizing a fluorine-containing monomer with a polyalkylene glycol (meth)acrylate. The block copolymer can be prepared by polymerizing a fluorine-containing monomer or a perfluoropolyether group with a polyalkylene glycol (meth)acrylate or an alkylene oxide.
A weight ratio of the fluorine-containing segment to the hydrophilic segment is usually from 5:95 to 95:5, preferably from 20:80 to 80:20.
In the graft copolymer, the fluorine-containing segment comprises a polymer of the fluorine-containing monomer, and the hydrophilic segment comprises a polymer of the polyalkylene glycol (meth)acrylate.
In the graft copolymer, it is preferred that the fluorine-containing segment constitutes a main chain and the hydrophilic segment constitutes a side chain.
In order to polymerize the graft copolymer, the fluorine-containing monomer and polyalkylene glycol (meth)acrylate are used. Preferably, the polymerization is a solution polymerization. Examples of a solvent for the polymerization include ethyl alcohol, isopropyl alcohol, dipropylene glycol, dipropylene glycol monomethyl ether and the like.
The fluorine-containing monomer is a monomer having at least one of a polyfluoroalkyl group, a polyfluoroalkenyl group and a perfluoropolyether group.
Examples of the monomer having the polyfluoroalkyl group, the polyfluoroalkenyl group or the perfluoropo
REFERENCES:
patent: 3574791 (1971-04-01), Sherman et al.
patent: 5370919 (1994-12-01), Fieuws et al.
Kubo Motonobu
Morita Masamichi
Uesugi Norimasa
Daikin Industries Ltd.
Mulcahy Peter D.
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