Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2006-07-18
2006-07-18
Boykin, Terressa (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C424S423000, C424S424000, C428S411100, C428S412000, C428S480000, C428S500000, C528S271000
Reexamination Certificate
active
07078476
ABSTRACT:
Disclosed is a copolyester resin having number average molecular weight over 5,000 for solventborne metal coating binder, which has superior gloss retention and color stability after long term outdoor exposure, and a coating composition comprising the same. The copolyester has excellent weatherability and color stability. The copolyester resin is prepared through the polycondensation of an acid component comprising 60–90 mol % of aromatic dicarboxylic acid selected from the group consisting of isophthalic acid, C1–C2 alkylester of isophthalic acid, phthalic acid, C1–C2 alkylester of phthalic acid, phthalic anhydride, and mixtures thereof, and 10–40 mol % of cycloaliphatic dicarboxylic acid selected from the group consisting of 1,2-cyclohexane dicarboxylic anhydride, 1,2-cyclohexane dicarboxylic acid, C1–C2 alkylester of 1,2-cyclohexane dicarboxylic acid, 1,4-cyclohexane dicarboxylic acid, C1–C2 alkylester of 1,4-cyclohexane dicarboxylic acid, and mixtures thereof, an alcohol component comprising 60–100 mol % of 2,2-dialkyl-1,3-propandiol and 0–40 mol % of a polyvalent alcohol and 0–5 mol % of a polyvalent alcohol or acid.
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Johnson, L.K., “New Monomers for Polyester Powder Coating Resins, ” JCT Journal of Coatings Technology (Philadelphia, PA), vol. 65, No. 826, Nov. 1, 1993, pp. 1,6,19-26.
Ki Kim Soon
Woong Lee Tae
Boykin Terressa
SK Chemicals Co. Ltd.
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