US 6,159,549 AGranted

Flexible phosphatized polyester-urethane primers and improved coating systems including the same

AssigneePPG Industries Ohio, Inc.

InventorsPadmanabhan Sundararaman, Jamel S. Richardson, Robert A. Montague, Trang D. Tran

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Abstract

The invention provides a novel coating composition which includes: (a) a polyester-based resin component, (b) an epoxy component, (c) a crosslinker component, (d) a catalyst component, and (e) a diluent component. The polyester-based resin component includes at least one phosphatized polyester resin; and the epoxy component includes at least one phosphatized epoxy resin. These coating compositions are particularly suitable as primers, and especially as primers for use used in conjunction with coating composition which include fluorocarbon polymers. Also provided is a method of providing a substrate with a multilayer coating system. This method includes: (a) applying at least one layer of the aforementioned novel primer onto a substrate; and (b) applying at least one layer of a second coating composition over the primed substrate of step (a). When this method employs the use of a second coating composition which includes fluorocarbon polymers, the results is multi-layered coated substrate which, while having excellent weatherability properties, also has excellent formability properties.

Claims20

Dependent claims

A coating composition which comprises:

(a) a polyester-based resin component present in amount ranging from about 50 to about 70 weight percent, said polyester-based component comprising not more than one phosphatized polyester resin having a number average molecular weight ranging from about 3,000 to about 5,000;
(b) an epoxy component present in amount ranging from about 5 to about 15 weight percent, said epoxy component comprising at least one phosphatized epoxy resin having a number average molecular weight ranging from about 500 to about 5,000;
(c) a crosslinker component present in amount ranging from about 15 to about 25 weight percent, said crosslinker component comprising the isocyanurate of hexamethylene diisocyanate blocked with 2-butanone oxime;
(d) a catalyst component present in amount ranging from about 1 to about 5 weight percent, said catalyst component comprising at least one catalyst compound selected from the group consisting of dibutyltindilaurate and dibutyltindiacetate;
and
(e) a diluent component present in amount ranging from about 60 to about 40 weight percent, said diluent component comprising at least one diluent compound selected from the group consisting of aromatic petroleum distillates, methyl ethyl ketone, methyl isobutyl ketone, alcohols, dimethyl phthalate, mono- and dialkyl ethers of ethylene and diethylene glycol;
said weight percentages for components (a) through (d) are based on the total weight of the resin solids in the resulting coating composition;
said weight percentages for component (e) is based on the total weight of the resulting coating composition;
and said number average molecular weights for components (a) and (b) measured by gel permeation chromatography using the calibration curve of polystyrene standards.

6 more elements

A method of providing a substrate with a multilayer coating system, said method comprising:

(a) applying at least one layer of a first coating composition onto a substrate, wherein said first coating composition has an elongation of at least about 10 percent as determined with an INSTRON Tester according to ASTM D638-72, said first coating composition comprises:
(i) a polyester-based resin component present in amount greater than about 30 weight percent, said polyester-based component comprising not more than one phosphatized polyester resin having a number average molecular weight ranging from about 1,000 to about 20,000;
(ii) an epoxy component present in amount less than about 25 weight percent, said epoxy component comprising at least one phosphatized epoxy resin having a number average molecular weight ranging from about 100 to about 10,000;
(iii) a crosslinker component present in amount less than about 45 weight percent, said crosslinker component comprising at least one polyisocyanate compound;
(iv) a catalyst component present in amount less than about 15 weight percent;
and
(v) a diluent component present in amount less than about 80 weight percent;
said weight percentages for components (i) through (iv) are based on the total weight of the resin solids in the resulting coating composition;
said weight percentages for component (v) is based on the total weight of the resulting coating composition;
and said number average molecular weights for components (i) and (ii) measured by gel permeation chromatography using the calibration curve of polystyrene standards;
and
(b) applying at least one layer of a second coating composition over the coated substrate of step (a).

9 more elements

Dependencies are inferred from the claim text.