Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-08-13
2000-07-18
Moore, Margaret G.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525104, 525100, 525474, 525476, 525438, 525446, 525934, C08G 7714
Patent
active
060908904
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a resin composition for powder paints. More particularly, this invention relates to a resin composition for powder paints wherein the said resin composition exhibits an excellent curability and excellent electrostatic properties (wraparound) and provides a cured coating with an excellent appearance, excellent resistance to weathering, and excellent mechanical properties.
BACKGROUND ART
Powder paints do not contain organic solvents, and the corresponding lack of toxicity coupled with contemporary environmental concerns, such as air pollution and the like, has caused annual increases to occur in the consumption of the resin compositions used for powder paints (hereinafter referred to as powder-paint resin compositions). Widely used as powder-paint resin compositions are, for example, compositions whose main component is reactive functional group-containing curable organic resin, e.g., acrylic resin, polyester resin, epoxy resin, and the like, and which may contain any of various curing agents on an optional basis. However, the cured coatings afforded by the cure of such compositions suffer from an inadequate weathering resistance. This has led to various investigations into powder-paint resin compositions that would have the capacity to produce highly weathering-resistant cured coatings. For example, Japanese Patent Application said Open [Kokai or Unexamined] Number Sho 52-66536 [66,536/1977] proposes a powder-paint resin composition comprising hydroxyl-functional polyester resin with an acid number no greater than 40 and straight-chain organopolysiloxane bearing silicon-bonded methoxy. Japanese Patent Application Laid Open [Kokai or Unexamined] Number Sho 58-168667 [168,667/1983] proposes a powder-paint resin composition comprising thermosetting organic resin and epoxy-functional alkoxysilane. Japanese Patent Application Laid Open [Kokai or Unexamined] Number Sho 59-59751 [59,751/1984] proposes a powder-paint resin composition comprising thermosetting organic resin and straight-chain organopolysiloxane having a viscosity of 10 to 10,000 centistokes and functionalized with the amino, mercapto, carboxyl, or phosphate group.
However, each of these powder-paint resin compositions suffers from an unsatisfactory curability and unsatisfactory electrostatic properties (wraparound). Moreover, the coatings afforded by the cure of these compositions still evidence an inadequate weathering resistance. Another problem with these coatings is their unsatisfactory mechanical properties.
The present inventors achieved the present invention as the result of extensive investigations directed to solving the problems described above.
In specific terms, then, the object of the present invention is to provide a powder-paint resin composition that exhibits an excellent curability and excellent electrostatic properties (wraparound) and that generates a cured coating with an excellent appearance, excellent resistance to weathering, and excellent mechanical properties.
DISCLOSURE OF THE INVENTION
The present invention relates to a powder-paint resin composition comprising
(A) epoxy-functional branched organopolysiloxane and
(B) a compound bearing a functional group reactive with the epoxy group, The present invention also relates to a powder-paint resin composition comprising
(A) epoxy-functional branched organopolysiloxane,
(B) a compound bearing a functional group reactive with the epoxy group, and
(C) a compound bearing a functional group reactive with the functional group in component (B), from 2/98 to 98/2.
The powder-paint resin composition according to the present invention will be explained in detail in the following.
The epoxy-functional branched organopolysiloxane (A) functions as a base, crosslinker, or additive for the present composition. This component provides the present composition with an improved curability and electrostatic properties (wraparound) as well as an improved appearance (e.g., smoothness and so forth), improved weathering resistance, and improved mechanic
REFERENCES:
patent: 3926885 (1975-12-01), Keil
patent: 4954580 (1990-09-01), Zahir
patent: 5280098 (1994-01-01), Witucki et al.
patent: 5422396 (1995-06-01), Daly et al.
patent: 5464901 (1995-11-01), Yoshikawa et al.
patent: 5516858 (1996-05-01), Morita et al.
Patent Abstracts of Japan, vol. 095, No. 004 (May 31, 1995) & JP 07-026119 (Jan. 27, 1995).
"Powder Coating: Why--How--When", Journal of Paint Technology, vol. 44, No. 565. pp. 30-37, 1972.
Agawa Tetsuro
Akamatsu Shoji
Murakami Ichiro
Dow Corning Toray Silicone Co. Ltd.
Moore Margaret G.
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