Paper/plastic laminate and method for making same

• US 6,673,465 B2
• Filed: 05/29/2001
• Issued: 01/06/2004
• Est. Priority Date: 05/29/2001
• Status: Active Grant

• Current Assignee: Chase Corporation
• Original Assignee: James Lordi
• Inventors: Lordi, James
• Primary Examiner(s): KILIMAN, LESZEK B
• Application Number:
  US09/867,293
• Publication Number:
  US 20020182430A1
• Time in Patent Office: 952 Days
• Field of Search: 428/511, 428/537.5, 428/34.2, 428/34.3, 428/195, 156/325, 156/327, 427/207.1, 427/208.8
• US Class Current: 428/537.5
• CPC Class Codes: B32B 2307/734 Dimensional stability
• CPC Class Codes: B32B 27/10 of paper or cardboard
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: Y10T 428/1303 Paper containing [e.g., paperboard, cardboard, fiberboard, etc.]
• CPC Class Codes: Y10T 428/1307 Bag or tubular film [e.g., pouch, flexible food casing, envelope, etc.]
• CPC Class Codes: Y10T 428/31895 Paper or wood
• CPC Class Codes: Y10T 428/31993 Of paper
• CPC Class Codes: Y10T 428/31996 Next to layer of metal salt [e.g., plasterboard, etc.]

Abstract

The invention is a paper/plastic laminate suitable for use in office, midrange and high-speed traditional laser and digital copiers and digital printers, and other like equipment using heat set fuser toner adhesion as the method for fusing/bonding an ink to a paper. The paper/plastic laminate comprises a paper web laminated to a plastic film using 100% solids adhesives. Employing 100% solids adhesive technology in the laminating process yields a more dimensionally stable paper/plastic laminate when the laminate is re-exposed to heat and the ability to make lighter paper/plastic laminates than otherwise possible using solvated or waterborne adhesives.

Claims

1. A paper/plastic laminate comprising:

a paper web having a top and bottom surface,

a plastic film having a top surface and a bottom surface, the top surface of the plastic film being adhered by a 100 percent solids adhesive to the bottom surface of the paper web forming a paper/plastic laminate, the paper/plastic laminate being dimensionally stable, and

wherein the paper web is treated to inhibit penetration of the 100 percent solids adhesive.

2. The paper/plastic laminate of claim 1 wherein the paper web is treated with a metal salt at the rate of about 50 pounds per 1000 pounds of starch or more.

3. The paper/plastic laminate of claim 2 wherein the metal salt is sodium nitrate.

4. The paper/plastic laminate of claim 2 wherein the metal salt is sodium chloride.

5. The paper/plastic laminate of claim 1 wherein the plastic film has a thermal heat shrinkage of less than about 2.0 percent.

6. The paper/plastic laminate of claim 1 wherein the plastic film has a mechanical tensile strength greater than about 29,000 psi.

7. The paper/plastic laminate of claim 1 wherein the printable paper sheet has an opacity greater than about 77 percent.

8. The paper/plastic laminate of claim 1 further comprising optical brightening agents sufficient to give an overall brightness greater than about 83 GE brightness.

9. The paper/plastic laminate of claim 1 further comprising a sizing agent positioned within the paper top surface.

10. The paper/plastic laminate of claim 1 wherein the paper has a surface treatment creating an electrostatic level greater than 10⁹ SER.

11. The paper/plastic laminate of claim 10 wherein the electrostatic level is less than about 10¹² SER.

12. The paper/plastic laminate of claim 11 wherein the surface treatment comprises a sodium compound.

13. The paper/plastic laminate of claim 12 wherein the surface treatment comprises sodium nitrate.

14. The paper/plastic laminate of claim 12 wherein the surface treatment comprises sodium chloride.

15. The paper/plastic laminate of claim 1 wherein the paper has an overall moisture content less than about 5 percent.

16. The paper/plastic laminate of claim 15 wherein the paper has an overall moisture content between about 4 and 5 percent.

17. The paper/plastic laminate of claim 1 further comprising a second paper web having a top surface and laminating the second web top surface to the plastic film bottom surface using a 100 percent solids adhesive.

19. The paper/plastic laminate of claim 1 further comprising a second paper web having a top surface laminated to the plastic film using an adhesive.

18. The method of making a dimensionally stable paper/plastic laminate comprising:

selecting a paper web having a bottom surface,

selecting a plastic film having a top surface,

laminating the paper web bottom surface to the plastic film top surface using a 100 percent solids adhesive, the paper web, plastic film and 100 percent solids adhesive being selected such that the laminated combination is dimensionally stable, and

wherein the paper web is treated to inhibit penetration of the 100 percent solids adhesive.