Thermoset covering compositions

Details Thermoset covering compositions Thermoset covering compositions

1996-07-24

1998-10-13

Gorr, Rachel

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...

525124, 525131, C08G 1880

Patent

active

058213155

DESCRIPTION:

BRIEF SUMMARY
INDUSTRIAL FIELD OF APPLICATION

This invention concerns thermoset covering compositions and, more precisely, it concerns thermoset covering compositions which are ideal for clear coat paints for top-coat painting for forming paint films on automobiles, for example, which, in particular, have excellent acid resistance and scratching resistance.


PRIOR ART

In recent years, two-coat one-bake systems in which a base coat paint in which a coloring agent, such as a colored pigment or a metallic pigment for example, has been compounded and a clear coat paint which does not contain a coloring agent, or which contains only a trace amount of coloring agent, are painted over each other using a wet on wet system, and both paints are heated and hardened at the same time, have generally been adopted for top-coat painting on the outer panels of automobiles, and a paint film with a very high sense of gloss and a high degree of smoothness is obtained in this way.
However, paints films which have such an excellent appearance, with the preference of darker colors in recent years, reveal water spotting due to acid rain which has now become a problem for society and scratching which is produced when car washing, and there is a strong demand for these problems to be resolved.
The use of hydroxy group containing acrylic based copolymers, blocked polyisocyanate compound and alkyl etherified amino resins to improve thermoset resin compositions with which paint films which have excellent acid resistance and scratch resistance can be obtained have been disclosed in Japanese Patent Kokai H2-242867 and Japanese Patent Kokai H3-172368 as means of improving upon these points.
However, with such resin compositions, there is no invention in the vinyl based copolymer and blocked polyisocyanate compound and so the scratching resistance is inadequate.
Furthermore, thermoset resin compositions with which paint films which have excellent scratching resistance are obtained by combining polyisocyanate compounds and acrylic based copolymers which have soft segments have been disclosed in Japanese Patent Kokai H2-305873.
However, these resin compositions are comprised of just the abovementioned acrylic based copolymers and polyisocyanate compounds and so in those cases where the base coat paint is an alkyl etherified amino resin thermoset type paint the appearance of the paint film with two-coat one-bake painting is inadequate.
Moreover, thermoset resin compositions with which paint films which have excellent scratching resistance and excellent staining resistance are obtained by combining vinyl based copolymers which have soft segments, alkyl etherified amino resins and blocked polyisocyanate compounds have been disclosed in Japanese Patent Kokai H1-158079.
However, with these resins again, acetoacetic acid ester alone, for example, is used for the blocking agent of the blocked polyisocyanate compound and so yellowing on baking and compatibility cannot be balanced.


PROBLEMS TO BE RESOLVED BY THE INVENTION

The aim of this present invention is to resolve the problems of the past as indicated above and so provide thermoset covering compositions with which paint films which have excellent acid resistance and scratching resistance are obtained, with which paint films with a satisfactory appearance can be obtained using two-coat one-bake painting, and with which failure of the appearance of the paint film due to yellowing at the time of baking or compatibility can be prevented.


MEANS OF RESOLVING THESE PROBLEMS

As a result of thorough research carried out with a view to developing paint compositions for top coat clear coat purposes which form paint films which have none of the abovementioned problems, which have excellent paint film physical and chemical performance, and which have excellent scratching resistance and acid resistance without loss of brilliance, smoothness or yellowing resistance for example, with two-coat one-bake systems, the inventors have discovered that the abovementioned aims can be realized with thermoset covering composi

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