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Badge-free can coating

A coating and phenol technology, applied in the field of can coatings that do not contain bisphenol A diglycidyl ether, can solve the problems of not being able to become, not conforming to the food law, not resistant to processing, etc.

Inactive Publication Date: 2002-05-08
WR GRACE & CO CONN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently available polyester-based coatings, such as those cross-linked with amino- or isocyanate-type resins, are used as exterior coatings for three-piece cans, but are not resistant to processing when in contact with food, or do not comply with food laws, Therefore, it cannot be used as a replacement coating formulation

Method used

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Examples

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Embodiment 1

[0020] Exemplary can coating compositions of the present invention can be prepared and used as follows. Coating batches may be formulated as follows using a mixer capable of mixing the components described below into a sufficiently uniform composition. The polyester resin comprising trimethylolpropane, neopentyl glycol and other polyols, as previously described, is preferably used in an amount of 40-85% by weight, more preferably 69-80% by weight (based on the total amount of the coating composition weight) was first added to the mixer. The polyester resin was URALAC XP 8481 SN (available from DSM Resins) solvated in a solvent mixture comprising SOLVESSO 150 and butyl cellosolve (they were used in a 4:1 weight ratio). SOLVESSO 150 aromatic hydrocarbon solvent is available from Exxon Chemical Company and is believed to have a boiling range of 186-210°C. Butyl cellosolve is also known as butyl glycol (eg, ethylene glycol monobutyl ether).

[0021] Preferred Range % ...

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PUM

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Abstract

An exemplary coating of the invention, suitable for use as an interior coating for metal cans, comprises (a) a polyester resin; (b) a resol resin; and (c) a solvent, the coating being substantially free of bisphenol-A-diglycidyl-ether and bisphenol-F-diglycidyl ether (e.g., 'BADGE' or 'BADGE-type' components), and preferably also substantially free of polyvinyl chloride.

Description

Background of the invention [0001] Metal containers containing food and beverages often have one or more coatings to prevent contact between the product being filled and the metal. This is to prevent or reduce product corrosion of metals and adverse effects on product quality. For the manufacture of containers of this type, such as steel or tin cans, the metal sheets used are coated with a suitable coating composition before they are formed (such as a three-piece can product) or deformed (such as a deep drawing process). When manufacturing food and beverage cans, the coatings used should have very good flexibility and low toxicity. [0002] Epoxy novolac type coatings have been used as lacquers applied to metal can stock (for example, for three-piece cans) and baked to impart good resistance to aggressive filling products, mechanical properties and metal adhesion to the coating. Compatibility. However, many of these coatings contain 2,2'-bis(4-hydroxyphenyl)propane-bis(2,3-...

Claims

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Application Information

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IPC IPC(8): B65D25/34B32B15/09C08L23/02C08L27/18C08L91/00C09D161/06C09D161/10C09D167/00
CPCC09D167/00C09D161/06C08L27/18C08L91/00C08L23/02
Inventor C·沃格特P·安布罗斯
Owner WR GRACE & CO CONN
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