Laminated articles and their production

Patent metadata

Field	Value
Publication number	US-9005739-B2
Application number	US-81422410-A
Country	US
Kind code	B2
Filing date	Jun 11, 2010
Priority date	Jul 23, 2009
Publication date	Apr 14, 2015
Grant date	Apr 14, 2015

Abstract

A laminated article comprises a substrate having opposite major surfaces, and a multi-layer lamination composition comprising (i) a base layer and (ii) an adhesion layer bonded to at least one surface of the base layer. The adhesion layer (ii) comprises a propylene copolymer which comprises units derived from propylene and from about 3 to about 25 wt % of units derived from ethylene and/or a C 4 to C 8 alpha-olefin and which has a melting temperature less than about 105° C. and a heat of fusion less than about 75 J/g. The lamination composition is thermally laminated to the substrate such that said adhesion layer (ii) is bonded to at least one major surface of said substrate.

First claim

The invention claimed is:

1. A laminated article comprising:
(a) a substrate having opposite major surfaces, and
(b) a first multi-layer lamination composition comprising (i) a first base layer and (ii) a first adhesion layer disposed on at least one surface of the base layer, the first adhesion layer comprising:
1) from about 92.5 wt % to about 75 wt % ethylene vinyl acetate, based upon the total weight of the first adhesion layer, wherein the ethylene vinyl acetate has melt index (2.16 kg @190° C.) of about 14 g/10 min and a vinyl acetate content of about 18 wt %, and
2) from about 7.5 wt % to about 25 wt % of a propylene copolymer, based upon the total weight of the first adhesion layer, that consists essentially of units derived from propylene and about 15 wt % of units derived from ethylene, and wherein the propylene copolymer has a melting temperature less than about 105° C., a heat of fusion less than about 75 J/g, a triad tacticity of three propylene units, as measured by 13 C NMR, of 75% or greater, a crystallinity of from about 0.5 to about 40%, and a melt index (2.16 kg @190° C.) of about 9.1 g/10 min, and

wherein the first lamination composition is thermally laminated to the substrate such that said first adhesion layer is bonded to at least one major surface of said substrate.

2. The article of claim 1 , wherein the base layer (i) comprises an oriented polypropylene film or a polyester film.

3. The article of claim 1 , wherein said adhesion layer (ii) is a monoextrusion or a coextrusion layer.

4. The article of claim 1 , wherein the adhesion layer (ii) comprises a blend of said propylene copolymer with at least one further polymer selected from low density polyethylene, a metallocene-based plastomer, linear polyethylene or polypropylene.

5. The article of claim 1 , wherein the adhesion layer (ii) comprises a friction reducing additive in an amount between about 500 ppm and about 1500 ppm of said adhesion layer.

6. The article of claim 1 , wherein the lamination composition (b) is corona discharge treated prior to being thermally laminated to the substrate (a).

7. The article of claim 1 , wherein the substrate is a document having information disposed on said at least one major surface.

8. The article of claim 1 , wherein the lamination composition (b) is transparent after the thermal lamination step.

9. The article of claim 1 , wherein element (b) further comprises a second multi-layer lamination composition comprising (i) a second base layer and (ii) a second adhesion layer disposed on at least one surface of the second base layer, the second adhesion layer comprising a propylene copolymer which consists essentially of units derived from propylene and about 15 wt % of units derived from ethylene and which has a melting temperature less than about 105° C. and a heat of fusion less than about 75 J/g, and the second lamination composition is thermally laminated to the first lamination composition and/or the substrate such that the adhesion layers are bonded to said major surfaces respectively of said substrate and/or to each other.

10. The article of claim 1 , wherein the first adhesion layer comprises from about 15 wt % to about 25 wt % of the propylene copolymer, based upon the total weight of the first adhesion layer.

11. The article of claim 1 , wherein the first adhesion layer comprises about 25 wt % of the propylene copolymer, based upon the total weight of the first adhesion layer.

Assignees

• Van Den Bossche Linda M
• Vogelaers Nancy G
• Exxonmobil Chem Patents Inc

Inventors

• Van Den Bossche Linda M
• Vogelaers Nancy G

Classifications

• B32B27/32

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title

• B32B2307/412

  Transparent · CPC title

• Y10T428/31938

  Polymer of monoethylenically unsaturated hydrocarbon · CPC title

• Y10T156/1092

  All laminae planar and face to face · CPC title

• Y10T156/10

  Methods of surface bonding and/or assembly therefor · CPC title