Moisture resistant, repulpable paper products and method of making same

• US 6,846,573 B2
• Filed: 04/08/2003
• Issued: 01/25/2005
• Est. Priority Date: 04/19/2002
• Status: Expired due to Term

• Current Assignee: AKZO Nobel Coatings International BV (Nouryon BV), The Seydel Cos.
• Original Assignee: EvCo Research LLC (Nouryon BV)
• Inventors: Seydel, Scott O.
• Primary Examiner(s): KILIMAN, LESZEK B
• Application Number:
  US10/409,238
• Publication Number:
  US 20030198826A1
• Time in Patent Office: 658 Days
• Field of Search: 428/537.5, 428/536, 428/34.2
• US Class Current: 428/537.5
• CPC Class Codes: D21H 19/14 applied in a form other than the aqueous solution defined in group D21H19/12
• CPC Class Codes: D21H 21/20 Wet strength agents
• CPC Class Codes: Y10T 428/1303 Paper containing [e.g., paperboard, cardboard, fiberboard, etc.]
• CPC Class Codes: Y10T 428/31808 Cellulosic is paper
• CPC Class Codes: Y10T 428/31848 Next to cellulosic
• CPC Class Codes: Y10T 428/31851 Natural oil
• CPC Class Codes: Y10T 428/31986 Regenerated or modified
• CPC Class Codes: Y10T 428/31993 Of paper

Abstract

Hydrogenated triglycerides having melting points above 50° C. are substituted for paraffin as a coating material for the surface of paper products and the resulting paper products have improved wet strength and moisture resistance in addition to being repulpable thereby providing a distinct environmental advantage over paraffin coated products.

Claims

1. A repulpable moisture resistant paper product comprising:

a) a paper product having a surface;

b) a coating on said surface, said coating consisting essentially of a hydrogenated triglyceride or a blend of natural, partially and fully hydrogentated triglycerides said coating having a minimum melting point of at least about 50°

C.;

c) said coating imparting improved moisture resistance and wet strength to said paper product; and

d) said coated paper product being repulpable and recyclable.

6. The paper product of claim 1 wherein said hydrogenated triglycerides have carbon chain lengths between C:

14 and C;

20, an amorphic crystalline structures, and a melt temperature from about 55°

C. to about 65°

C.

7. The paper product of claim 1 wherein the paper substrate is corrugated paperboard and the coating of hydrogenated triglyceride has been applied as a hot melt and ranges from about 2 lbs. to about 12 lbs. per thousand square feet of paperboard surface, said triglyceride coating having impregnated the surface of the paperboard.

8. The paper product of claim 7 wherein the corrugated paperboard is a flattened box perform.

2. The repulpable moisture resistant paper product wherein the melting point of the hydrogenated triglyceride is in the range from about 55°

C. to about 65°

C.

3. The repulpable paper product of claim 2 wherein the hydrogenated triglyceride is hydrogenated vegetable oil selected from the group consisting of soybean oil, peanut oil, olive oil, palm, coconut and cottonseed oils.

4. The repulpable paper product of claim 2 wherein the triglyceride is selected from the group consisting of beef tallow, pork lard, poultry grease, and fish oils.

5. The recycled paper product of claim 2 wherein the triglyceride is a reclaimed triglyceride.

9. The paper product of claim 3 wherein the paper product is a moisture proof carton for a food product.