Claims
- 1. A process for producing a resin composition for powder coatings, which comprises:
- (1) reacting a polyester resin (A1) with an acrylic resin (A2) to prepare a composition (A) containing a polyester resin (A1), an acrylic resin (A2) and a copolymer (CP) formed by said reaction, wherein said polyester resin (A1) has an average of 0.1 to 1.0 carboxyl groups in one molecule, a hydroxyl value of 10 to 100 and a softening point of 50.degree. to 150.degree. C., and said acrylic resin (A2) has an average of 0.1 to 4.0 glycidyl groups in one molecule, a hydroxyl value of 30 to 150 and a softening point of 50.degree. to 150.degree. C.; and
- (2) melt-kneading 5 to 50 parts by weight of a blocked isocyanate with 100 parts by weight of said composition (A).
- 2. A process for producing a resin composition for powder coatings according to claim 1, wherein the polyester resin (A1) has an average of 0.15 to 0.60 carboxyl groups in one molecule.
- 3. A process for producing a resin composition for powder coatings according to claim 1, wherein the acrylic resin (A2) has an average of 0.3 to 2.0 glycidyl groups in one molecule.
- 4. A process for producing a resin composition for powder coatings according to claim 1, wherein the polyester resin (A1) has a hydroxyl value of 20 to 50.
- 5. A process for producing a resin composition for powder coatings according to claim 1, wherein the acrylic resin (A2) has a hydroxyl value of 50 to 120.
- 6. A process for producing a resin composition for powder coatings according to claim 1, wherein the polyester resin (A1) has a softening point of 90.degree. to 140.degree. C.
- 7. A process for producing a resin composition for powder coatings according to claim 1, wherein the acrylic resin (A2) has a softening point of 90.degree. to 140.degree. C.
- 8. A process for producing a resin composition for powder coatings according to claim 1, wherein the ratio of the sum of the polyester resin (A1) and the polyester components of the copolymer (CP) to the sum of the acrylic resin (A2) and the acrylic components of the copolymer (CP) is in the range of from about 10/90 to 90/10 by weight.
- 9. A process for producing a resin composition for powder coatings according to claim 8, wherein the ratio of the sum of the polyester resin (A1) and the polyester components of the copolymer (CP) to the sum of the acrylic resin (A2) and the acrylic components of the copolymer (CP) is in the range of from 30/70 to 70/30 by weight.
- 10. A process for producing a resin composition for powder coatings according to claim 1, wherein the blocked polyisocyanate (B) is present in an amount of 10 to 30 parts by weight per 100 parts by weight of the composition (A).
- 11. A process for producing a resin composition for powder coatings according to claim 1, wherein the copolymer (CP) is present in an amount of 0.5 to 20.0 wt % of composition (A).
- 12. A process for producing a resin composition for powder coatings according to claim 1, wherein the copolymer (CP) is present in an amount of 2 to 10 wt % of composition (A).
- 13. A process for producing a resin composition for powder coatings according to claim 1, wherein the copolymer (CP) is a block copolymer.
Priority Claims (1)
Number |
Date |
Country |
Kind |
62-272047 |
Oct 1987 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 07/925,893 filed Aug. 7, 1992 abandoned, which is a continuation of application Ser. No. 07/663,064, filed on Mar. 1, 1991, abandoned, which is a continuation of application Ser. No. 07/263,229, filed on Oct. 27, 1988 abandoned.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
3781380 |
Labana et al. |
Dec 1973 |
|
4073775 |
Matsuo et al. |
Feb 1978 |
|
4299931 |
Coran et al. |
Nov 1981 |
|
4818791 |
Murakami et al. |
Apr 1989 |
|
Foreign Referenced Citations (9)
Number |
Date |
Country |
3213160 |
Oct 1983 |
DEX |
48-38618 |
Jan 1973 |
JPX |
54-36339 |
Mar 1979 |
JPX |
55-1945 |
Jan 1980 |
JPX |
56-51169 |
Mar 1981 |
JPX |
59-6267 |
Jan 1984 |
JPX |
60-120764 |
Jun 1985 |
JPX |
3-17165 |
Jan 1991 |
JPX |
9201756 |
Feb 1992 |
WOX |
Non-Patent Literature Citations (2)
Entry |
Patent Abstracts of Japan, vol. 12, No. 117 (C-487) [2964], Apr. 13, 1988. |
Patent Abstracts of Japan, vol. 11, No. 85 (C-410) [2532], Mar. 14, 1987. |
Continuations (3)
|
Number |
Date |
Country |
Parent |
925893 |
Aug 1992 |
|
Parent |
663064 |
Mar 1991 |
|
Parent |
263229 |
Oct 1988 |
|