Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-06-18
1998-12-29
Gulakowski, Randy
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525453, C08G 1800
Patent
active
058543600
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a curable composition comprising a blocked polyisocyanate compound, specifically to a (curable) resin composition which is suitable for chipping-resistant coating materials for vehicles such as automobiles.
DESCRIPTION OF THE PRIOR ART
It has previously been known that, in curable compositions composed mainly of a blocked polyisocyanate compound which are frequently used for urethane coating materials, particularly chipping-resistant coating materials, organic heavy metal compounds such as zinc octylate, lead octylate, tin octylate, and the like, and tertiary amine compounds such as triethylenediamine, triethylamine, and the like, are used as catalysts, in order to lower the dissociation temperature of the blocked polyisocyanate compound to impart thereto a low-temperature curing property.
However, the use of a tertiary amine catalyst in the above-mentioned curable composition causes difficulties in attaining a sufficiently low dissociation temperature of the blocked polyisocyanate compound, and the use of an organic heavy metal catalyst, while being effective in lowering the dissociation temperature thereof to impart a low-temperature curing property, causes yellowing of the cured coating and also a heavy metal pollution problem. In order to solve these problems, JP A 6-192364 discloses the use of hydroxyl-containing quaternary ammonium salt compounds as catalysts capable of lowering the dissociation temperature of the blocked isocyanate compounds. However, hydroxyl-containing quaternary ammonium salt compounds, while being capable of lowering the dissociation temperature, are not satisfactory in curing properties.
DISCLOSURE OF THE INVENTION
The an object of the invention is to find a catalyst which is capable of lowering the dissociation temperatures of blocked polyisocyanate compounds and imparting thereto excellent low-temperature curing properties, and to provide a curable composition having no environmental problems.
In order to achieve the above objective, the invention provides a curable composition containing the components (A), (B) and (C) described in the following; 1 to 18 carbon atoms which are non-reactive to isocyanates and may be the same or different, and said groups may form a heterocyclic ring via an oxygen or nitrogen atom, and Y.sup.- denotes an anion of a hydroxide, an alkoxide, an aryloxy or a carbonate; or an anion of a carboxylate, a sulfonate, a phosphate or a borate which may contain a hydrocarbon group.
The curable composition of the invention, as compared with those using conventional tertiary amine catalysts, can lower the temperature to start curing (dissociation temperature) by at least 10.degree. C., thus effecting low-temperature curing to give excellent coating properties. When compared with those using organic heavy metal catalysts, it gives a superior anti-yellowing property of the cured coat and a superior storage stability as a coating material, and meets a high-level of safety standards, being free from environmental problems such as water pollution. Exhibiting the excellent properties thus far explained, the curable composition of the invention can be used with advantage for chipping-resistant coating materials for vehicles such as automobiles.
BEST MODE OF CARRYING OUT THE INVENTION
First, each of the components (A), (B) and (C) constituting the curable composition of the invention will be explained.
Organic polyisocyanates constituting the blocked polyisocyanate compound (A) include, for example, monomeric polyisocyanates, polymeric polyisocyanates, NCO group-terminated polyurethane prepolymer, and mixtures thereof.
Among these organic polyisocyanates, monomeric polyisocyanates include, for example, aliphatic polyisocyanates such as hexamethylenediisocyanate (HDI) and lysine diisocyanate; alicyclic polyisocyanates such as dicyclohexylmethane diisocyanate (hydrogenated MDI), isophorone diisocyanate (IPDI), cyclohexane diisocyanate (CHDI), hydrogenated tolylene diisocyanate and hydrogenated xylylene diisocy
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Itoh Tetsuo
Matsunaga Shunji
Gulakowski Randy
Sanyo Chemical Industries Ltd.
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