Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1998-03-16
1999-12-07
Hampton-Hightower, P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528230, 528253, 528254, 528258, 528261, 528328, 525509, 525510, 525512, 525518, 524100, C08G 1238, C08L 6128, C09D16128, C09J16128
Patent
active
059985739
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an amino resin composition which is excellent in toughness, heat resistance, light resistance, and staining resistance, etc. The composition of the present invention is useful as a molding compound, a facing material, a curing agent for coatings, and an adhesive for woody materials, etc.
BACKGROUND ART
A malamine resin has been conventionally and widely employed as a molding compound, a facing material, a curing agent for coatings, and an adhesive for woody materials, etc. because of excellent heat resistance, high hardness, high gloss, quick curability, and an excellent mold release property in molding.
On the other hand, melamine is hexa-functional, and a triazine skelton is rigid. Accordingly, a crosslinking density in a cured product therefrom becomes exceedingly high in a case of preparing a resin with formaldehyde, whereby it is very hard and excellent in heat resistance. Contrarily, however, it is brittle, and there has been limitation in a case that the molding compound is employed as industrial parts.
For that reason, in a case that it is employed as molding compound, it has been attempted that the melamine resin has been modified by a rubber or phenol. However, a sufficient effect has not been obtained in the existing circumstances. Further, although the addition of various kinds of alcohols and saccharides into a melamine resin composition has been attempted for improving crack resistance and mechanical strength. However, in a case that co-condensation has not been sufficient in the preparation, there has been drawbacks to cause a decline of mechanical strength, a decline of crack resistance, and a decline of glossiness in surface because additives cause bleedout with a lapse of time.
Still further, the melamine resin in mainly employed in a baking coating as a curing agent for an alkyd resin, and it is excellent in heat resistance, light resitance, and resistance to scratching. On the other hand, it is poor in bending ability of a coating layer and post processability. For that reason, guanamines such as benzoguanamine and acetoguanamine are occasionally employed. However, benzoguanamine resin has benzene group in the structure and accordingly, it has been known that it in poor in light resistance and thus, it is limited in utilization. Also, a melamine-formaldehyde resin is poor in solubility in organic solvents and, for that reason, in the case that it is employed as an organic solvent-based coating, a melamine-formaldehyde reaction product has been dissolved into solvents by further alkoxylation with alcohols such as methanol, ethanol, propanol, isopropanol, and butanol. However, alkoxylation reaction has drawbacks that it requires a long time in reaction steps and that as the alkoxylation reaction in conducted in acidic condition, condensation is accelerated and thus, it becomes difficult in controlling a molecular weight.
The melamine resin has been conventionally and mainly employed as a facing material for a horizontal decorated surface in a furniture due to a high hardness, a high heat resistance, and high gloss. In recent years, so-called post-forming processing is frequently put into practice, in which a decorative laminated sheet is post-processed after curing in order to promote features as a design.
Whereas a decorative melamine laminated sheet has a high hardness, cracks are occasionally caused with a lapse of time. Therefore, the improvements in that point have been tried.
For the purpose, it has been conducted an improvement for modifying a melamine resin using various kinds of compounds having copolycondensation, or adding various kinds of additives to the melamine resin so as to improve the post-forming processing property and for crack resistance. however, when an incorporation of the compounds or additives into the resin is poor, water resistance and gloss are lowered. Thus, it can not be necessarily said that sufficient results have been obtained.
Melamine has been frequently employed as adhesives for woody materials in c
REFERENCES:
patent: 2228161 (1941-01-01), Zerweck et al.
patent: 5328978 (1994-07-01), Schon et al.
Gryder et al., "The Kinetics of the Exchange Reaction between the Two Oxidation States of Cerium in Acid Solution", Journal of American Chemical Society (J. Am. Chem. Soc.), vol. 73 pp. 2890-2895 (1951). The month in the date of the publication is not available.
Hofmann, "Chemiche Berichte", (Chem. Ber.), vol. 18, pp. 2755, (1885). The month in the date of the publication is not available.
Furuya Yuko
Nakayama Keisuke
Takakura Makoto
Uehara Hiroyuki
Hampton-Hightower P.
Nissan Chemical Industries Ltd.
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