Packaging materials having barrier coatings based on water-epoxy resin copolymers
AssigneeAir Products and Chemicals, Inc.
InventorsFrederick Herbert Walker, Frank Ralph Pepe, John Bartram Dickenson
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Abstract
A multilayer packaging material comprising (a) at least one layer of a gas-permeable material, and (b) at least one layer of a gas-barrier coating comprising a polymeric polyol made by copolymerizing a multifunctional epoxide resin and water in the presence of an amount of acid effective for polymerizing the epoxide resin and the water, the amount of water being sufficient to avoid gelation, the polymeric polyol optionally reacted with a crosslinking agent for hydroxyl functionality, especially an amino resin.
Claims32
A method for making a multilayer packaging material which reduces transmission of oxygen comprising
- (a) providing a gas-permeable packaging material,
- (b) providing a gas-barrier coating comprising a polymeric polyol made by copolymerizing a multifunctional epoxide resin and water in the presence of an amount of acid effective for polymerizing the epoxide resin and the water, the amount of water being sufficient to avoid gelation, the polymeric polyol optionally reacted with a cross-linking agent for hydroxyl functionality, and
- (c) applying the gas barrier coating over the gas-permeable packaging material to form a multilayer packaging material.
A multilayer packaging material comprising
- (a) at least one layer of a gas-permeable polymeric material, and
- (b) at least one layer of a gas-barrier coating comprising a polymeric polyol made by copolymerizing a multifunctional epoxide resin and water in the presence of an amount of acid effective for polymerizing the epoxide resin and the water, the amount of water being sufficient to avoid gelation, the polymeric polyol optionally reacted with an amino resin crosslinking agent.
A multilayer packaging material having at least one gas-permeable packaging material layer and at least one gas barrier material layer characterized in that the gas barrier material layer has an oxygen permeability constant (OPC) less than 2 Dow units and comprises the reaction product of
- (a) a polymeric polyol made by copolymerizing the diglycidyl ether of bisphenol-A, the diglycidyl ether of bisphenol-F, the diglycidyl ether of hydroquinone, the diglycidyl ether of resorcinol or a mixture thereof and water in the presence of an ether solvent and an amount of superacid effective for polymerizing the diglycidyl ether and the water, the amount of water being sufficient to avoid gelation and
- (b) an amino resin crosslinking agent which is a melamine-formaldehyde resin, a urea-formaldehyde resin, a benzoguanamine-formaldehyde resin, a glycouril-formaldehyde resin, or an etherified derivative thereof.
A multilayer packaging material having at least one gas-permeable packaging material layer and at least one gas barrier material layer characterized in that the gas barrier material layer comprises the reaction product of
- (a) a polymeric polyol comprising glycol end groups and a repeat unit structure which contains two glycidyl units and primary and/or secondary alcohols and having a Mn of at least about 450 and
- (b) an amino resin crosslinking agent which is a melamine-formaldehyde resin, a urea-formaldehyde resin, a benzoguanamine-formaldehyde resin, a glycouril-formaldehyde resin, or an etherified derivative thereof.
Dependencies are inferred from the claim text.