Packaging Laminate

• US 20100038266A1
• Filed: 11/29/2007
• Published: 02/18/2010
• Est. Priority Date: 12/01/2006
• Status: Abandoned Application

• Current Assignee: Akzo Nobel N.V. (Nouryon BV)
• Original Assignee: Akzo Nobel N.V. (Nouryon BV)
• Inventors: Hällström, Hans, Gratz, Susanne, Solhage, Fredrik
• Application Number:
  US12/516,972
• Publication Number:
  US 20100038266A1
• Time in Patent Office: Days
• US Class Current: 206/223
• CPC Class Codes: B32B 27/10 of paper or cardboard
• CPC Class Codes: B32B 27/30 comprising vinyl (co)polymers; comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: B32B 29/00 Layered products comprising a layer of paper or cardboard
• CPC Class Codes: D21H 17/375 Poly(meth)acrylamide
• CPC Class Codes: D21H 17/42 anionic
• CPC Class Codes: D21H 17/455 comprising tertiary amine or being at least partially quaternised
• CPC Class Codes: D21H 21/54 being spherical, e.g. microcapsules, beads
• CPC Class Codes: D21H 27/10 Packing paper packaging materials of special type or form B65D65/38
• CPC Class Codes: D21H 27/30 Multi-ply for surface covering D21H27/18; making on paper-making machines D21F9/00, D21F11/00
• CPC Class Codes: Y10T 156/10 Methods of surface bonding and/or assembly therefor
• CPC Class Codes: Y10T 428/249972 Resin or rubber element
• CPC Class Codes: Y10T 428/31783 Paper or wood
• CPC Class Codes: Y10T 428/31993 Of paper

Abstract

The invention relates to a packaging laminate comprising at least one base layer of paper or paper board and at least one liquid barrier layer, said paper or paper board comprising expanded or unexpanded expandable thermoplastic microspheres. The invention further relates to the production and use of a packaging laminate and a package for food or beverage products and its production.

Claims

1. A retortable packaging laminate comprising at least one base layer of sized paper or paper board, at least one liquid barrier layer and at least one gas barrier layer, said paper or paper board comprising expanded or unexpanded expandable thermoplastic microspheres.

2. The retortable packaging laminate as claimed in claim 1, having ability to withstand treatment with saturated steam at from about 110 to about 150°

C. at a time from about 30 minutes to about 3 hours.

3. The retortable packaging laminate as claimed in claim 2, wherein the paper or paper board is made of pulp from softwood.

4. The retortable packaging laminate as claimed in claim 3, comprising a base layer of a double ply paper or paper board made from bleached and unbleached, respectively, softwood kraft pulp.

5. The retortable packaging laminate as claimed in claim 1, wherein the paper or paper board is sized with a formulation comprising a sizing agent selected from the group consisting of ketene dimers and multimers, succinic anhydrides and rosins, and also comprising an acrylamide based polymer.

6. The retortable packaging laminate as claimed in claim 5, wherein the acrylamide based polymer is cationic.

7. The retortable packaging laminate as claimed in claim 1, wherein the paper or paper board comprises a wet strength resin.

8. The retortable packaging laminate as claimed in claim 7, wherein the wet strength resin is selected from the group consisting of polyamine epihalohydrines, polyamide epihalohydrines and polyaminoamide epihalohydrins.

9. The retortable packaging laminate as claimed in claim 1, wherein the thermoplastic microspheres are expanded.

10. The retortable packaging laminate as claimed in claim 9, wherein the thermoplastic microspheres have been added as pre-expanded thermoplastic microspheres.

11. The retortable packaging laminate as claimed in claim 9, wherein the thermoplastic microspheres have been added as unexpanded thermally expandable microspheres being expanded during the production of the paper or paper board, said paper or paper board still being wet during the expansion.

12. The retortable packaging laminate as claimed in claim 9, wherein the thermoplastic microspheres have been added as unexpanded thermally expandable microspheres during the production of the paper or paper board, said paper or paper board being fully or almost fully dried during the expansion.

13. A process for the production of a retortable packaging laminate comprising a step of applying at least one liquid barrier layer and at least one gas barrier layer to a sheet or web of retortable paper or paper board comprising expanded or unexpanded expandable thermoplastic microspheres.

14. (canceled)

15. A sealed package for food or beverage products made of a retortable packaging laminate comprising at least one base layer of sized paper or paper board, at least one liquid barrier layer and at least one gas barrier layer, said paper or paper board comprising expanded or unexpanded expandable thermoplastic microspheres.

16. A process for the production of a sealed package comprising the steps of forming a container from a retortable packaging laminate comprising at least one base layer of sized paper or paper board, at least one liquid barrier layer and at least one gas barrier layer, said paper or paper board comprising expanded or unexpanded expandable thermoplastic microspheres, filling the container with a food or beverage product, and sealing the container.

17. The process as claimed in claim 16, further comprising heat treating the filled and sealed package.