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
2005-04-12
2005-04-12
Lipman, Bernard (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S327300
Reexamination Certificate
active
06878780
ABSTRACT:
Powder coating compositions having reduced volatility and improved processibility compared to conventional powder coatings consist essentially of a copolymer having pendant functionalities or pendant groups capable of reacting with a dicarboxylic acid such as the glycidyl groups of glycidyl acrylate or methacrylate copolymer and a cross-linking effective amount of a dicarboxylic acid. The reaction of the above pendant groups and the dicarboxylic acid cross-links or cures the powder coating after application to a substrate. The dicarboxylic acids according to the invention eliminate the need for a third component which is a flow control agent which improves the processibility of a two-component powder coating. The dicarboxylic acids according to the invention have a sublimation temperature great enough to decrease or prevent their vaporization during the curing of the powder coating and have a melting point low enough to impart improved flow properties to the powder coatings.
REFERENCES:
patent: 3752870 (1973-08-01), Labana
patent: 4142018 (1979-02-01), Ozawa et al.
patent: 5254466 (1993-10-01), Picataggio et al.
patent: 5292825 (1994-03-01), Yamamoto et al.
Gates Jeffrey A.
Sharp Michael S.
Cognis Corporation
Ettelman Aaron R.
Lipman Bernard
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