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
1995-06-02
1997-06-17
Smith, Jeffrey T.
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...
524792, 524801, C08K 506, C08K 502
Patent
active
056398204
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an aqueous dispersion composition and a preparation thereof, a water- and oil-repellent and mold release agent comprising said composition as an active component.
RELATED ART
Hitherto, a water- and oil-repellent formed from a copolymer comprising a polymerizable compound containing a polyfluoroalkyl group (hereinafter referred to as "fluoromonomer") and another copolymerizable compound which is not compatible therewith (hereinafter referred to as "hydrocarbon monomer"), for example, (meth)acrylate containing a long chain alkyl group such as stearyl acrylate is well-known (cf. Japanese Patent Kokai Publication Nos. 9619/1980 and 29501/1980, and Japanese Patent Kokoku Publication Nos. 8068/1985 and 56912/1988). The use of such hydrocarbon monomer can improve the oil-repellency without deteriorating the water-repellency. It is well-known that, since these monomers are not compatible with each other on the use of emulsion polymerization, a water-soluble organic solvent such as acetone is added to improve the compatibility between both monomers and to then improve the copolymerization property.
However, since a usual amount (10-30% by weight of an aqueous solution) of the water-soluble organic solvent gives remarkably insufficient compatibility between both monomers to give a significantly broad distribution of composition, an emulsion particle in which a phase rich in a fluorine-containing component is separated from a phase rich in a hydrocarbon component is formed to give a low water- and oil repellency and a low mold releasability of the copolymer. When a large amount of the water-soluble organic solvent is added to improve the compatibility between both monomers, the compatibility is increased but the surface activity of a surfactant emulsifying the monomers is decreased, so as to deteriorate significantly the emulsification state of the monomer emulsion so that a large amount of a coagulum disadvantageously generates after polymerization.
According to the prior arts, the improvement of compatibility results in the generation of coagulum, and it was very difficult to satisfy the both of improvement of compatibility and no generation of coagulum.
SUMMARY OF THE INVENTION
A main object of the present invention is to provide a method for preparing an aqueous dispersion composition having improved compatibility of monomers without the generation of coagulum.
According to one aspect, the present invention provides a method for preparing an aqueous dispersion composition containing a fluorocopolymer formed by emulsion polymerization of a polymerizable compound having a polyfluoroalkyl group and another copolymerizable compound noncompatible with the polymerizable compound, in an aqueous solution containing a compatibilizer, wherein the compatibilizer is selected from the group consisting of (a) a low-molecular weight compound having a perfluoroalkyl group and a hydrocarbon alkyl group in a molecule, (b) a low-molecular weight compound having a perfluoropolyether group and a hydrocarbon alkyl group in a molecule, (c) a macromolecular compound prepared by the copolymerization of a polymerizable compound having a perfluoroalkyl group and a polymerizable hydrocarbon compound, and (d) a hydrocarbon macromolecular compound having a perfluoropolyether group in the molecule.
According to another aspect, the present invention provides an aqueous dispersion composition prepared by the above method.
DETAILED EXPLANATION OF THE INVENTION
In the present invention, the fluorocopolymer contains at least 30% by weight of the polymerizable compound having the polyfluoroalkyl group (hereinafter referred to as "fluoromonomer") as the monomer unit. When the amount is smaller than 30% by weight, good water- and oil repellency and good mold releasability cannot be achieved. The amount of the other copolymerizable compound (hereinafter referred to as "hydrocarbon monomer") is from 10 to 70% by weight. When the amount is smaller than 10% by weight, the water- and oil-rep
REFERENCES:
patent: 5240990 (1993-08-01), Kalifass et al.
Kubo Motonobu
Morita Masamichi
Daikin Industries Ltd.
Smith Jeffrey T.
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