Two-coast barrier system comprising polyurethane
AssigneeSun Chemical Corporation
InventorSarfaraz Khan
Life of this patent
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Abstract
A two-coat barrier system employing a coating of a water-dispersible or solvent-soluble polyurethane resin with innate gas and moisture vapor barrier properties and an additional coating of a multivalent metal cation to enhance the overall barrier performance without the need to add fillers.
Claims35
A method of preparing a barrier layer comprising the step of applying a second coating comprising a multivalent metal cation or other crosslinker onto a first coating, the first coating comprising a polyurethane resin.
A two-coat barrier system comprising:
- a. a first coating comprising a polyurethane resin;
- and
- b. a second coating comprising a multivalent metal cation or other crosslinker.
The barrier layer of 17, providing a moisture vapor transmission rate (MVTR) at 90% RH and 38° C. of no more than 15 g/m2/day, wherein a coating weight of the polyurethane resin is no more than 12 g/m2.
A barrier material including a barrier layer coated on a substrate, the barrier layer comprising a polyurethane resin and less than about 5 wt % inorganic laminar filler materials.
A method of enhancing the barrier properties of a barrier material comprising a coating layer including a polyurethane resin coated on a substrate, the method comprising the step of applying a coating composition comprising a multivalent metal cation or other crosslinker onto the coating layer.
A system for enhancing the barrier properties of a coating layer comprising:
- a polyurethane resin applied on a substrate according to the formula A/(B·C)>2, in which:
- A=the oxygen transmission rate at 23° C. and 90% RH in g/m2/day for the coating layer;
- B=the oxygen transmission rate at 23° C. and 90% RH in g/m2/day for a barrier layer including a multivalent metal cation or other crosslinker applied onto the coating layer;
- and
- C=a coating weight in g/m2 (dry) of the coating layer.
Dependencies are inferred from the claim text.