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
1995-07-21
1997-03-04
Szekely, Peter A.
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...
524462, 526206, 526242, 526243, 526245, 526246, 526247, 526248, 526250, 526252, 526253, 526254, 526255, C08K 502, C08F 1624, C08F 1418, C08F 1220
Patent
active
056080026
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a fluorine-containing water- and oil-repelling agent composition and particularly relates to a solution-polymerization type water- and oil-repelling agent composition prepared by polymerizing or copolymerizing a monomer having a polyfluoroalkyl group in a specific fluorine-containing solvent, and a process for the preparation.
BACKGROUND ART
As a water- and oil-repelling agent composition to be used for dry cleaning of clothes and for water-proof spray, there has been heitherto used a solution-polymerization type water- and oil-repelling agent composition using a trichlorotrifluoroethane (CFC113) and/or 1,1,1-trichloroethane as a polymerization solvent from the viewpoint of water- and oil-repelling effect and easiness in handling thereof (JP-B-64635/1992 and JP-B-65113/1992).
However, it was recently decided in a worldwide scale to prohibit the production of such solvents as trichlorotrifluoroethane and 1,1,1-trichloroethane for the purpose of protection of the ozone layer, and it is urgently needed to find out a solvent replacing these toxic ones for the water- and oil-repelling agent composition.
As alternative solvents, hydrocarbons, perchloroethane, esters, ketones and the like have being studied (JP-A-78425/1993), and in these solvents a perfluoroalkyl group-containing monomer and a monomer free of fluorine atom are copolymerized. However, usually if a mixing ratio of the monomer having a perfluloroalkyl group is increased, though water- and oil-repelling property is enhanced, there is a tendency that precipitate is formed and storage stability becomes worse. If a mixing ratio of the monomer free of fluorine atom is increased, though stability is improved, the water- and oil-repelling property tends to be worse, and it is difficult to obtain a practical composition.
The present invention was made in consideration of the above-mentioned problems, and it is an object to provide a water- and oil-repelling agent composition which is excellent in storage stability and water- and oil-repelling property, and serves to remarkably decrease or completely avoid the destruction of the ozone layer, and a process for preparation thereof.
DISCLOSURE OF THE INVENTION
The above-mentioned object can be accomplished by solution-polymerizing a polymerizable monomer component containing at least a polyfluoroalkyl group-containing monomer in a polymerization solvent containing at least 5% (% by weight, hereinafter the same) of at least one kind of compound selected from a group consisting of a hydrochloroflurocarbon being called an alternative Freon and having 2 to 3 carbon atoms and a hydrofluorocarbon having 4 to 6 carbon atoms and 4 or more fluorine atoms.
PREFERRED EMBODIMENTS OF THE INVENTION
One of the features of the present invention is to use a specific fluorine-containing polymerization solvent.
It is preferred that the polymerization solvent to be used in the present invention has a boiling point of 0.degree. to 150.degree. C., especially 20.degree. to 100.degree. C., further especially 30.degree. to 80.degree. C. If the boiling point is lower than 0.degree. C., handling of products tends to become difficult, and if it is higher than 150.degree. C., drying of the treated article becomes slow and there is a tendency of causing problem in viewpoint of operability.
As the hydrochloroflurocarbon to be used in the present invention and having a boiling point of 0.degree. to 150.degree. C. and 2 to 3 carbon atoms, there are a dichlorofluoroethane such as 1,1-dichloro-1-fluoroethane (HCFC141b) (boiling point: 32.degree. C. ), a dichloropentafluoropropane such as 1,1-dichloro-2,2,3,3,3-pentafluoropropane (HCFC225ca) (boiling point: 51.degree. C.), 1,3-dichloro-1,1,2,2,3-pentafluoropropane (HCFC225cb) (boiling point: 54.degree. C.), and the like.
Also, as the hydrofluorocarbon having a boiling point of 0.degree. to 150.degree. C., 4 to 6 carbon atoms and 4 or more fluorine atoms, there are hydrofluorocarbons of a butane type, a cyclobutane type, a pentane type an
REFERENCES:
patent: 3919183 (1975-01-01), Jager et al.
patent: 5182342 (1993-01-01), Feiring et al.
patent: 5494984 (1996-02-01), Funaki et al.
International Search Report for International Appln. No. PCT/JP94/01778.
Hayashi Kazunori
Kubo Motonobu
Daikin Industries Ltd.
Szekely Peter A.
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