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
1998-05-11
2000-04-11
Dawson, Robert
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...
524538, 524539, 524542, 524843, C08J 302, C08K 320, C08L 320
Patent
active
060489243
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a water-borne resin composition comprised of amino resin (A) obtained from amino compound (a) comprising at least one carboxyl group in a phenyl group of benzoguanamine and water-borne resin (B) having a functional group reactive with the amino resin (A), which has excellent water reducibility, or water dispersibility, and excellent water resistance, solvent resistance, a retort resistance, and curability which are useful properties as a binder or an additive for coatings, processed paper goods, processed fiber goods, adhesives, inks, and other coatings, and a water-borne coating comprised thereof as an essential component.
BACKGROUND ART
Primarily from an environmental conservation point of view, it has, for example, long been desired to decrease organic solvents released from coatings in coating processes. Therefore, demand for non-environmentally polluting resin, that is, water-borne resin, has rapidly increased. As a cross-linking agent used in a water-borne coating, a water soluble coating, methylated amino resin is the most popular. However, methylated amino resin is hydrophobic. Therefore, methylated amino resin does not have very good water resistance, solvent resistance, curability and the like compared to the properties of solvent-borne amino resin. In addition, solubility in water of methylated amino resin is insufficient; therefore, it is difficult to decrease the amount of organic solvent contained in a coating. Moreover, amino resin having low molecular weight is released in a dryer, the released material is deposited as discharges, and then contaminates coated goods. Therefore, it is difficult to obtain a water-borne resin composition having adequate properties.
A measure of dissolving of a water insoluble alkyletherificated amino resin, for example, includes measurements in which oxycarbonic acid is used as disclosed in U.S. Pat. Nos. 3,464,946, 3,444,114, etc.
However, when this kind of cross-linking agent is used, water resistance, flexibility, curability, and the like are inadequate, therefore, it is impossible to obtain a coating producing an excellent cured film, that is, to obtain a coating having adequate properties. In particular, when these water-borne resin compositions are used as a binder for coatings or inks and the like, heat resistance is inferior.
Therefore, the problem to be solved in the present invention is to provide a water-borne resin composition which has excellent hydrophilicity (including water reducibility), that is, water reducibility or water dispersibility, can decrease the amount of organic solvent contained in a coating, has excellent curability, water resistance, flexibility, heat resistance, hardeness which are equivalent to those of solvent-borne amino resin, and which can decrease discharges in a dryer, and a water-borne coating comprised thereof.
DISCLOSURE OF THE INVENTION
As the result of extensive investigations directed to solving the problems described above, the present inventors found that a water-borne resin composition comprising amino resin (A) obtained from amino compound (a) comprising at least one carboxyl group in a phenyl group of benzoguanamine and water-borne resin (B) having a functional group reactive with the amino resin (A) can produce a desired water soluble material or water dispersed material, and thereby reached the present invention.
That is, the present invention relates to carboxyl group in a phenyl group of benzoguanamine, the amino compound (a) is represented by chemical formula 1 and water-borne resin (B) having a functional group reactive with the amino resin (A); ##STR2## (2) a water-borne resin composition according to (1), wherein amino resin (A) is obtained by addition reaction of aldehyde compound (b) to amino compound (a), and by etherificating with monohydric alcohol compound (c); (A) is obtained from amino compound (a) and at least one compound selected from the group consisting of urea, melamine, benzoguanamine, cyclohexanecarboguanamine, steroguan
REFERENCES:
patent: 5455306 (1995-10-01), Mori et al.
patent: 5516834 (1996-05-01), Mori et al.
Iwahashi Masanori
Koshizawa Shuichi
Obayashi Ryoichi
Onishi Kiyoshi
Sato Taiji
Aylward D.
Dainippon Ink and Chemicals Inc.
Dawson Robert
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