Polyesters and coatings containing the same

US9359524B2 · kind B2 · utility

Assignee

• PPG Industries Ohio, Inc. · US

Inventors

• Jonathan P. Breon · Memphis, US
• Ljiljana Maksimovic · Washington, US
• Anthony M. Chasser · Washington, US
• Edward R. Millero, Jr. · Gibsonia, US
• John E. Schwendeman · Wexford, US
• Robert E. Jennings · Ellwood City, US

Key dates

• Filing date: Oct 15, 2013
• Grant date: Jun 7, 2016
• Expiry date: Dec 11, 2033

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31794
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Disclosed is a polyester prepared from a mixture of reactants including: a) an aromatic monoacid, where the aromatic monoacid includes from 25 to 60 weight % based on the total weight of reactants; b) a polyacid, where the polyacid includes less than 90 mole % isophthalic acid; and c) a polyol having at least 3 hydroxyl groups. The mixture of reactants is substantially free of a non-aromatic monoacid, and said polyester has a dynamic viscosity of greater than 15,000 centipoise at 40° C. as measured by a Physica MCR 301 rheometer with 25 mm parallel plate and 0.1 mm gap as a function of increasing shear rate (0.1 to 10 s−1), and an acid value of less than 15 mg KOH/g. The polyacid can also be an aliphatic polyacid. Coatings comprising the same and substrates coated at least in part with such coatings are also disclosed.