Organic compounds -- part of the class 532-570 series – Organic compounds – Isocyanate esters
Patent
1996-12-23
1999-03-09
Lipman, Bernard
Organic compounds -- part of the class 532-570 series
Organic compounds
Isocyanate esters
560355, 564 37, C07C24900
Patent
active
058803122
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Technical Field
The present invention relates to a semicarbazide derivative and a coating composition containing the same and a polycarbonyl compound. More particularly, the present invention is concerned with a semicarbazide derivative or a terminal-blocked form thereof, which is obtained by reacting a polyisocyanate having from 3 to 20 isocyanate groups in a molecule thereof with hidrazine or a derivative thereof, or a mixture of non-terminal-blocked and terminal-blocked forms of hydrazine or a derivative thereof. The present invention is also concerned with a coating composition comprising at least one member selected from the semicarbazide derivative and a terminal-blocked form thereof as a curing agent, and a polycarbonyl compound. Further, the present invention is also concerned with a composition comprising at least one member selected from the semicarbazide derivative and a terminal-blocked form thereof and at least one member selected from a hydrophilic group-containing compound and a terminal-blocked form thereof (this composition is hereinafter frequently referred to as "semicarbazide composition"), and further concerned with a coating composition comprising this semicarbazide composition and a polycarbonyl compound.
The coating composition of the present invention has not only excellent cold-curing ability and storage stability, but is also capable of forming a coating which has excellent properties, such as excellent water resistance, stain resistance, hardness, toughness, weatherability, dispersion characteristics of pigment, gloss retentivity, adhesion properties, rust preventive properties, water impermeability, heat resistance and chemical resistance, and which is extremely excellent especially in water resistance, stain resistance and hardness. Therefore, the coating composition of the present invention can be advantageously used as a paint, an undercoating or finish coating material for building materials, an adhesive, a pressure-sensitive adhesive, a processing agent for papers, or a finish coating material for textile fabrics.
Prior Art
In recent years, in the field of coatings, an aqueous emulsion has been drawing attention as a substitute material useful in the shift from organic-solvent type coating materials to aqueous-solvent type coating materials. However, coatings formed from conventional aqueous emulsion type coating materials are unsatisfactory in respect of various properties, such as water resistance, stain resistance and hardness, as compared to coatings formed from organic-solvent type coating materials.
In an attempt to improve the above-mentioned properties of coatings formed from aqueous emulsion type coating materials, it has generally been conventional practiced to introduce a functional group into an aqueous emulsion type coating material so that a coating comprised of a cross-linked polymer (hereinafter frequently referred to as "cross-linked coating") can be formed.
With respect to an aqueous emulsion type coating material which is capable of forming a cross-linked coating, from the viewpoint of ease in coating operation and the like, it has been desired that such a coating material be of a cold-curing, one-pack type such that a coating material comprising a polymer and a curing agent therefor, both dispersed in an aqueous medium can be cured even without heating to form a cured film due to the evaporation of the aqueous medium after the coating. In recent years, as a coating material satisfying the above desire, a hydrazone-crosslinking type aqueous emulsion obtained by the dehydration-condensation reaction between a carbonyl group and a hydrazide group has been attracting attention.
For example, in Examined Japanese Patent Application Publication No. 46-20053, Unexamined Japanese Patent Application Laid-Open Specification No. 57-3850, Unexamined Japanese Patent Application Laid-Open Specification No. 57-3857, Unexamined Japanese Patent Application Laid-Open Specification No. 58-96643 and Unexamined Japanese Patent Application Laid-Op
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Murakami Tetsuya
Nakabayashi Akira
Asahi Kasei Kogyo Kabushiki Kaisha
Lipman Bernard
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