Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2000-05-30
2003-03-25
Sellers, Robert E. L. (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S116000, C525S119000, C525S123000, C525S143000, C525S162000, C525S169000, C525S170000, C525S182000, C525S207000, C525S208000, C525S217000, C525S218000, C525S221000, C525S424000, C525S425000, C525S426000, C525S438000, C525S440030, C525S443000, C525S444000, C525S455000, C525S456000, C525S481000, C525S531000, C525S533000, C525S934000
Reexamination Certificate
active
06538074
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a combination of two or more powder coatings of which each color is different, a powder coating composition comprising two or more powder coatings of which each color is different, a coating method using two or more powder coatings of which each color is different, a coating film or a coated substrate prepared by applying to a substrate two or more powder coatings according to the combination of powder coatings, and a coating film or a coated substrate prepared according to the coating method.
2. Discussion of the Related Art
Conventionally, powder coatings have been prepared by adding numerous color pigments to resins, curing agents, additives, mixing the above components, melt-kneading the mixture, followed by cooling, pulverization, and classification. Therefore, in these powder coatings, the powder coatings have to be prepared for each color needed, so that an enormous number of powder coating products are needed.
By contrast, in order to simplify the toning process, there has been proposed a powder coating prepared by forming a composite of several kinds of colored powders.
However, when the powder coatings of which each color is different are uniformly mixed upon use, in cases where of using the mixed powder coatings with particle sizes exceeding 20 &mgr;m, the particles of the powder coatings of each color can be generally distinguished by gross examination, thereby making it impossible to obtain a coating film having a homogeneous hue.
On the other hand, as disclosed in Japanese Unexamined Patent No. 4-504431, a method of forming a coating film of a desired hue comprising mixing two or more color powders each having an average particle size of 20 &mgr;m or less has been proposed. However, the yield tends to be lowered by down-sizing the particle size to 20 &mgr;m or less, and the particles are likely to be agglomerated when they are in the order of 20 &mgr;m or less, so that the free flowability of the powder coatings becomes poor, thereby giving rise to such problems as lack of handleability.
Also, a method of improving free flowability by granulating powder coatings by adding a granulating agent solution has been proposed. However, such processes require a large number of production steps, undesirably leading to a increase in costs.
One object of the present invention is to provide a combination of two or more powder coatings of which each color is different, to thereby give a coating film having a homogeneous hue.
Another object of the present invention is to provide a powder coating composition comprising two or more powder coatings of which each color is different, to thereby give a coating film having a homogeneous hue.
Another object of the present invention is to provide a coating method using two or more powder coatings of which each color is different, to thereby give a coating film having a homogeneous hue.
Another object of the present invention is to provide a coating film or a coated substrate having a homogeneous hue prepared by applying to a substrate two or more powder coatings, of which each color is different, according to the combination of powder coatings.
Another object of the present invention is to provide a coating film or a coated substrate having a homogeneous hue prepared by applying to a substrate two or more powder coatings, of which each color is different, according to the coating method described above.
These and other objects of the present invention will be apparent from the following description.
SUMMARY OF THE INVENTION
One aspect of the present invention is a combination of powder coatings usable in a coating method comprising mixing two or more powder coatings of which each color is different, wherein each of the powder coatings fuses with each other and is heat-cured, to thereby give a coating film having a homogenous hue.
Another aspect of the present invention is a powder coating composition comprising two or more powder coatings of which each color is different, wherein each of the powder coatings fuses with each other and is heat-cured, to thereby give a coating film having a homogenous hue.
Another aspect of the present invention is a coating method comprising the steps of:
(a) applying to a substrate two or more powder coatings, of which each color is different;
(b) heating to fuse with each other each of the two or more powder coatings applied in step (a); and
(c) curing the resulting fused product in step (b), to give a coating film having a homogeneous hue.
Another aspect of the present invention is a coating film or a coated substrate having a homogeneous hue prepared by applying to a substrate two or more powder coatings, of which each color is different, according to the combination of powder coatings described above.
Another aspect of the present invention is a coating film or a coated substrate having a homogeneous hue prepared by applying to a substrate two or more powder coatings, of which each color is different, according to the coating method as described above.
REFERENCES:
patent: 3843571 (1974-10-01), Fitzgerald
patent: 4910287 (1990-03-01), McLafferty et al.
patent: 5319001 (1994-06-01), Morgan et al.
patent: 5498663 (1996-03-01), Shimada et al.
patent: 5635548 (1997-06-01), Kittle et al
patent: 6207768 (2001-03-01), Sato et al.
patent: 0459048 (1991-12-01), None
patent: 0795589 (1997-09-01), None
patent: 7-188586 (1995-07-01), None
patent: 8-503239 (1996-04-01), None
patent: 081-43788 (1996-06-01), None
patent: 10-72557 (1998-03-01), None
English Abstract of JP-W-4504431 (Aug. 6, 1992).
English Abstract of PCT Publication WO94/11446 (May 1994).
English translation of JP-08-143788 (Jun. 4, 1996).
Patent Abstracts of Japan, Publication No. 08283617 A, Oct. 1996.
Patent Abstracts of Japan, Publication No. 08041384 A, Feb. 1996.
S. Kobayashi et al., “New Powder Coating”, Kogyozairyo (Industrial Materials), 43(6), 52-55 (Jun. 1995) with partial English translation.
M. Nagakura, “Control of Fluidity of Powder Coating and Leveling of Coating Film” Tosogijutsu (Coating Technique), pp. 60-65 (Aug. 1995) with partial English translation.
Aoki Katsutoshi
Inagaki Yasunori
Maruta Masayuki
Sato Yukiya
Tajima Hisakazu
Nippon Paint Co. Ltd.
Sellers Robert E. L.
LandOfFree
Combination of powder coatings of different colors heat... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Combination of powder coatings of different colors heat..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Combination of powder coatings of different colors heat... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3063555