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Phosphatized polyesters and coating compositions containing the same

a technology of phosphatized polyester and coating composition, which is applied in the direction of transportation and packaging, other domestic articles, synthetic resin layered products, etc., can solve the problem that the effects of compounding are perceived by some as harmful to human health

Inactive Publication Date: 2012-11-29
PPG IND OHIO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many of the coating compositions for food and beverage containers are based on epoxy resins that are the polyglycidyl ethers of bisphenol A. Bisphenol A in packaging coatings either as bisphenol A itself (BPA) or derivatives thereof, such as diglycidyl ethers of bisphenol A (BADGE), epoxy novolak resins and polyols prepared with bisphenol A and bisphenol F are problematic.
These compounds are nevertheless perceived by some as being harmful to human health.

Method used

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Examples

Experimental program
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examples

[0057]The following examples are offered to aid in understanding of the present invention and are not to be construed as limiting the scope thereof. Unless otherwise indicated, all parts and percentages are by weight.

example a

Phosphatized Polyester

[0058]A phosphatized polyester resin was prepared from the following mixture of ingredients:

IngredientParts by Weight2-Methyl 1,3-Propane diol19.90Trimethylol propane3.01Isophthalic acid14.35Dibutyl tin oxide (catalyst)0.06Maleic anhydride8.35Phthalic anhydride7.30Aromatic 10017.79Phosphoric acid (85% solvents)1.11Water0.082-Butoxyethanol4.26Monobutyl ether of diethylene glycol33.801Aromatic solvent from Exxon Mobile.

[0059]The first two ingredients were charged in a reaction vessel equipped with an agitator, a nitrogen blanket and a distillation set up and heated to 50° C. Once the temperature was reached, then the next four ingredients were added to the vessel and slowly heated to distillation. The mixture was esterified under a nitrogen atmosphere over a period of about twelve (12) hours at a temperature ranging between 180° C. and 240° C.

[0060]When the acid value of the mixture dropped to about 13.00 mg of KOH / g, the mixture was cooled to about 160° C. and t...

examples 1-3

[0063]A series of container coating compositions were prepared based on a binder comprising a polyester polyol and aminoplast and phenolplast curing agents. One composition (Example 1) contained a phosphatized polyester adhesion promoter, a second composition (Example 2) contained the bisphenol A diglycidyl ether (BADGE) adhesion promoter and the third composition (Example 3, control) contained no adhesion promoter.

[0064]The ingredients were added to a container with mild agitation to form clear varnishes. Each of the varnishes were drawn down over zinc treated aluminum panels that were baked in an electric forced draft oven to give a peak metal temperature of 450° F. (232° C.). The cured coatings were then evaluated for adhesion and blushing. The results are reported in Table I below.

TABLE ICoating Properties30 Minutes at 250° F.30 Minutes atMEK15 Minutes Boiling30 Minutes Boiling(121° C.) Retort5:250° F. (121° C.)ExampleCoatingDoubleDowfax3Acetic Acid4Deionized WaterRetort: Water ...

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Abstract

A coating composition comprising a resinous binder and up to 10 percent by weight of a phosphatized polyester. The compositions are useful for coating containers of all sorts such as food and beverage containers, and the phosphatized polyester provides enhanced adhesion of the coating to the container substrate. The compositions can be formulated to be substantially free of bisphenol A (BPA) and bisphenol A diglycidyl ether (BADGE).

Description

FIELD OF THE INVENTION[0001]The present invention relates to phosphatized polyesters and to coating compositions containing such polyesters. The compositions are useful for coating containers of various sorts such as food and beverage containers.BACKGROUND OF THE INVENTION[0002]A wide variety of coatings have been used to coat the surfaces of food and beverage containers. For example, metal cans are sometimes coated using coil coating or sheet coating operations, that is, a plane or coil or sheet of a suitable substrate, for example, steel or aluminum, is coated with a suitable composition and cured. The coated substrate is then formed into the canned body or canned end. Alternatively, the coating composition may be applied, for example, by spraying and dipping, to the formed can and then cured. Coatings for food and beverage containers should preferably be capable of high speed application to the substrate and provide the necessary properties when cured to perform in a demanding en...

Claims

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Application Information

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IPC IPC(8): C09D185/02B32B1/00C09D133/08
CPCC09D167/00C08G63/6926Y10T428/1352C08K5/0025C08L67/02B05D7/24B65D25/14B65D25/34C08G63/692C09D133/08C09D201/00B05D1/02B05D3/0236B05D7/227C09D167/02
Inventor MOUSSA, YOUSSEFKNOTTS, CLAUDIA
Owner PPG IND OHIO INC
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