Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Patent
1998-05-27
2000-08-29
Cooney, Jr., John M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
524270, 524284, 524414, 524589, 524590, 524710, 524773, 524775, 528 76, 528 85, 560 25, 560 26, 560158, 25218222, C08G 1880
Patent
active
061110485
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of The Invention
The present invention relates to a novel blocked polyisocyanate and use thereof. More particularly, the present invention is concerned with a novel blocked polyisocyanate obtained by blocking the terminal isocyanate groups of a non-blocked polyisocyanate with a thermally dissociative blocking agent, wherein the non-blocked polyisocyanate is obtained by reacting at least one diisocyanate selected from the group consisting of an aliphatic diisocyanate and an alicyclic diisocyanate with a polyhydroxy compound having an average number of hydroxyl groups as many as 4.5 to 10, and removing substantially all unreacted diisocyanate monomers; and is also concerned with use of the blocked polyisocyanate.
The use of the blocked polyisocyanate of the present invention includes, for example, a coating composition comprising a polyol as a main agent and the blocked polyisocyanate as a curing agent; an adhesive property-imparting composition comprising the blocked polyisocyanate, and a plasticizer and/or a solvent which are/is for the blocked polyisocyanate; and a plastisol composition comprising a plastisol (which is a dispersion of a vinyl chloride polymer in a plasticizer) and the adhesive property-imparting composition. The coating composition comprising the blocked polyisocyanate of the present invention as a curing agent has not only excellent curability even under low temperature conditions, but also is capable of forming a coating which has excellent impact resistance. Therefore, the coating composition of the present invention can be advantageously used for coating a metallic substrate (such as a steel plate or a surface-treated steel plate) and a plastic substrate, by the technique of roll coating, curtain flow coating or the like. Especially, the coating composition of the present invention is useful as materials for undercoating, top coating and intercoating various substrates; a coating material for a precoated metal including a rust-resistant steel plate; and a coating material for imparting fine appearance, weatherability, acid resistance, rust resistance, mechanical strength (such as chipping resistance and impact resistance) and the like to automobiles. The blocked polyisocyanate of the present invention has excellent miscibility with a plasticizer for the blocked polyisocyanate, so that, an adhesive property-imparting composition comprising the blocked polyisocyanate and a plasticizer and/or a solvent, can be combined with a plastisol to prepare a plastisol composition having excellent adhesive properties under low temperature conditions. This plastisol composition can be advantageously used, for example, as sealants, materials for forming an undercoating and a chip-resistant coating, and a material for the preparation of a PVC-coated steel plate in the fields of automobiles, wherein the plastisol composition is applied to by the technique of spraying, brushing or the like.
2. Prior Art
Energy-saving and the prevention of air pollution are important tasks in the field of coating. In this field, it has been desired to diversify and improve the functions of coating compositions and plastisols.
A blocked polyisocyanate, which is obtained by blocking the terminal isocyanate groups of a non-blocked polyisocyanate derived from an aliphatic and/or an alicyclic diisocyanate with a blocking agent, is stable at ambient temperature. However, upon heating the blocked polyisocyanate, the blocking groups dissociate from the terminal isocyanate groups of the blocked polyisocyanate, and the resultant deblocked polyisocyanate can serve as a curing agent for a polyol. In view of the above-mentioned properties, the blocked polyisocyanate has been expected to be a promising curing agent being capable of changing the type of a polyurethane coating composition from a two-pack type to a one-pack type, wherein the polyurethane coating composition comprises a polyol as a main agent and the blocked polyisocyanate as a curing agent, and is capable of providing a coating havin
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patent: 5232988 (1993-08-01), Venham et al.
patent: 5331078 (1994-07-01), Gras et al.
Patent Abstracts of Japan, vol. 9, No. 21 (C-263), Jan. 29, 1985 Abstract of JP 59170213.
Asahina Yoshiyuki
Usui Taketoshi
Asahi Kasei Kogyo Kabushiki Kaisha
Cooney Jr. John M.
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