Anti-blocking coatings for PVDC-coated substrates
AssigneeGraphic Packaging International, Inc.
InventorsDarrel Wilhoit, John Files
Life of this patent
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Abstract
A barrier composite having reduced blocking is disclosed. The composite may include a substrate, a barrier layer formed from polyvinylidene chloride disposed on the substrate, and an anti-blocking layer disposed on the barrier layer. The anti-blocking layer may be formed from polyvinyl alcohol, and optionally, colloidal silica, wax, or a combination thereof. Alternatively, the anti-blocking layer may be formed from a polymeric carrier material, colloidal silica, and a wax. Methods for forming such composites and for forming a roll of such composites are also disclosed.
Claims32
A barrier composite having reduced blocking comprising:
- (a) a substrate;
- (b) a barrier layer comprising polyvinylidene chloride disposed on the substrate;
- and
- (c) an anti-blocking layer disposed on the barrier layer.
A barrier composite having reduced blocking comprising:
- (a) a substrate;
- (b) a barrier layer comprising polyvinylidene chloride disposed on the substrate;
- and
- (c) an anti-blocking layer comprising polyvinyl alcohol disposed on the barrier layer, wherein the ratio of the weight of the anti-blocking layer to the weight of the barrier layer is from about 0.1 to about 0.4 on a dry/dry per unit area basis.
A barrier composite having reduced blocking comprising:
- (a) a substrate;
- (b) a barrier layer comprising polyvinylidene chloride disposed on the substrate;
- and
- (c) an anti-blocking layer comprising a polymeric carrier material, colloidal silica, and a wax disposed on the barrier layer, wherein the ratio of the weight of the anti-blocking layer to the weight of the barrier layer is from about 0.1 to about 0.4 on a dry/dry per unit area basis.
A barrier composite having reduced blocking comprising:
- (a) a polyethylene terephthalate substrate;
- (b) a polyvinylidene chloride layer disposed on the substrate;
- and
- (c) an anti-blocking layer disposed on the polyvinylidene chloride layer, the anti-blocking layer comprising:
- (i) polyvinyl alcohol;
- (ii) polyvinyl alcohol and colloidal silica;
- (iii) polyvinylidene chloride, a wax, and colloidal silica;
- (iv) a styrene-acrylic polymer, a wax, and colloidal silica;
- (v) an ethylene acrylic acid polymer, a wax, and colloidal silica;
- or
- (vi) any combination thereof.
A method of forming a barrier composite having reduced blocking comprising:
- (a) providing a substrate;
- (b) applying a barrier layer comprising polyvinylidene chloride to the substrate;
- and
- (c) applying an anti-blocking layer to the polyvinylidene chloride to form a composite, the anti-blocking layer comprising:
- (i) polyvinyl alcohol;
- (ii) polyvinyl alcohol and from about 0.25 to about 8 parts dry colloidal silica per 100 parts dry polyvinyl alcohol;
- (iii) polyvinylidene chloride, from about 0.25 to about 5 parts dry wax per 100 parts dry polyvinylidene chloride, and from about 0.25 to about 8 parts dry colloidal silica per 100 parts dry polyvinylidene chloride;
- (iv) a styrene-acrylic polymer, from about 0.25 to about 5 parts dry wax per 100 parts dry styrene-acrylic polymer, and from about 0.25 to about 8 parts dry colloidal silica per 100 parts dry styrene-acrylic polymer;
- (v) an ethylene acrylic acid polymer, from about 0.25 to about 5 parts dry wax per 100 parts dry ethylene acrylic acid polymer, and from about 0.25 to about 8 parts dry colloidal silica per 100 parts dry ethylene acrylic acid polymer, or
- (vi) any combination thereof.
A method of forming a roll of a barrier composite having reduced blocking comprising:
- (a) providing a substrate having a first side and a second side;
- (b) applying a first layer of polyvinylidene chloride to the first side;
- (c) applying an anti-blocking layer to the polyvinylidene chloride to form a composite, the anti-blocking layer comprising:
- (i) polyvinyl alcohol;
- (ii) polyvinyl alcohol and from about 0.25 to about 8 parts dry colloidal silica per 100 parts dry polyvinyl alcohol;
- (iii) polyvinylidene chloride, from about 0.25 to about 5 parts dry wax per 100 parts dry polyvinylidene chloride, and from about 0.25 to about 8 parts dry colloidal silica per 100 parts dry polyvinylidene chloride;
- (iv) a styrene-acrylic polymer, from about 0.25 to about 5 parts dry wax per 100 parts dry styrene-acrylic polymer, and from about 0.25 to about 8 parts dry colloidal silica per 100 parts dry styrene-acrylic polymer,
- (v) an ethylene acrylic acid polymer, from about 0.25 to about 5 parts dry wax per 100 parts dry ethylene acrylic acid polymer, and from about 0.25 to about 8 parts dry colloidal silica per 100 parts dry ethylene acrylic acid polymer, or
- (vi) any combination thereof;
- and
- (d) winding the composite into a roll such that the anti-blocking layer comes into contact with the second side of the substrate.
Dependencies are inferred from the claim text.