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
1995-03-08
1998-01-20
Dean, Ralph H.
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...
525100, 525101, C08G 1862, C09D14304
Patent
active
057102015
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to novel paint compositions, and more specifically to paint compositions which allow paint films to be formed which have excellent water-repellence and oil repellence, and in which there is no decrease in water-repellence or oil-repellence even when exposed for a long period in a natural environment.
Methods for conferring water-repellence and oil-repellence on paint by adding polysiloxane compounds have been generally known for a long time. This is because polysiloxane compounds have a low surface tension, and because they do not show phase solubility with usual paint resins the said polysiloxane compounds float to the top during the process of the drying of the paint film and form a layer of low surface energy. However, simple addition to paint resins of polysiloxane compounds alone, as is conventional, produces the problem that the low-surface-energy layer that forms on the paint film surface is prone to deciduation, and there is no escaping from a loss of water repellence and oil repellence with time. And the addition of large quantities of the said polysiloxane compounds to paint in order to suppress this decrease in water repellence and oil repellence with time also produces problems in that, because polysiloxane compounds have weak phase solubility with paint resins, it is difficult to obtain a uniform paint film.
The purpose of the present invention is to offer paint compositions which allow paint films to be formed which have excellent water-repellence and oil-repellence, and in which there is no decrease in water-repellence or oil-repellence even when exposed for a long period in a natural environment.
As the result of concerted research aimed at developing paints with the preferred qualities described above, the present inventors discovered that this purpose could be achieved with compositions containing vinyl type copolymers possessing a specific structure having a hydroxyl group and a polysiloxane moiety, and polysiloxane compounds possessing a specific structure having a hydroxyl group, and a hardening agent which allows reaction with hydroxyl groups; and we perfected the present invention on the basis of this information. Thus, the present invention offers paint compositions comprising (A) a vinyl type copolymer obtained by polymerizing (i) a silicone type vinyl monomer represented by the general formula ##STR1## (in the formula X is a hydrogen atom or a methyl group, R.sup.1 is a methyl group or a phenyl group, k is a number 1-5, and m is a number 3-150) weight, and (iii) another vinyl monomer 5-80% by weight, (B) a silicone compound represented by the general formula ##STR2## (in the equation either one of y.sup.1 and y.sup.2 is a hydroxyl group and the remaining one is a hydroxyl group or a methyl group; R.sup.2 is a methyl group or a phenyl group, and n is a number 3-150),
Below, the present invention will be discussed in detail.
Because paint compositions of the present invention use in the main resin silicone type compounds having a polysiloxane moiety and a hydroxyl group, both components, namely the vinyl type copolymer component (A) and the silicone type compound component (B) show good phase-solubility, and a large quantity of the said component (B) can be used. And, because the vinyl type copolymer of component (A) and the silicone type compound of component (B) are also 3-dimensionally cross-linked by reaction with the hardening agent of component (C), the silicone compound can be fixed in the paint resin by chemical bonding, and there is no decrease in water-repellence or oil-repellence even when the cured paint film is exposed for a long period in a natural environment.
As component (A) in compositions of the present invention, a copolymer obtained by normal free radical polymerization of (i) a silicone type vinyl monomer represented by the general formula ##STR3## (in the equation, X, R.sup.1, k and m have the same meanings as previously) weight, and (iii) another vinyl monomer 5-80% by weight is used. aforementioned starting material component (i
REFERENCES:
patent: 5066720 (1991-11-01), Ohsugi et al.
patent: 5087286 (1992-02-01), Fukuda
patent: 5393817 (1995-02-01), Deckers
Derwent, Chemical Patents Index, Plastics, Polymers, 26 Sep. 1990, 1-2.
Hayakawa Takeshi
Shibato Kishio
BASF Corporation
Dean Ralph H.
Sabourin Anne Gerry
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