Low opacity paper

Abstract

Paper products and products comprising such paper products, such as packaging paper, are provided that are made from a fibrous web containing highly refined cellulose fibers. A paper product comprising a fibrous web comprising cellulose fibers and a coating on a surface of the fibrous web. The coating comprises a transparency agent with at least about 95% by weight of a bio-based wax or oil. The cellulose fibers may have a Schopper-Riegler freeness value in the range of from about 60° SR to about 95° SR. The fibrous web may have a basis weight of less than or equal to about 30 g/m 2 and a thickness of about 50 μm to about 20 μm. The paper product displays an opacity of less than or equal to about 40%. The resulting product has a relatively low basis weight and a relatively low opacity.

What is claimed is: 
     
         1 . A paper product comprising:
 a fibrous web comprising cellulose fibers, wherein the cellulose fibers have a Schopper-Riegler freeness value in the range of from about 60° SR to about 95° SR; and   wherein the paper product has an opacity of less than or equal to about 40%.   
     
     
         2 . The paper product of  claim 1 , wherein the fibrous web has a basis weight of less than or equal to about 30 g/m 2 . 
     
     
         3 . The paper product of  claim 1 , further comprising a coating on a surface of the fibrous web, the coating comprising a transparency agent, the transparency agent comprising at least about 95% by weight of a bio-based wax or oil. 
     
     
         4 . The paper product of  claim 1 , wherein the paper product displays an opacity of less than about or equal to 30%. 
     
     
         5 . The paper product of  claim 1 , wherein the cellulose fibers have a Schopper-Riegler freeness value in the range of about 70° SR to about 90° SR. 
     
     
         6 . The paper product of  claim 1 , wherein the fibrous web has a basis weight of less than or equal to about 24 g/m 2 . 
     
     
         7 . The paper product of  claim 3 , wherein the bio-based wax or oil is a plant derived wax or oil, which has a melting point of from about 25° C. to about 75° C. 
     
     
         8 . The paper product of  claim 3 , wherein the bio-based wax or oil is a coconut-based wax, a soy-based wax, a palm-based wax, a rice-based wax, or mixtures thereof. 
     
     
         9 . The paper product of  claim 1 , wherein the paper product has a Gurley air permeability of less than or equal to about 45,200 seconds. 
     
     
         10 . The paper product of  claim 1 , wherein the paper product displays a water vapor resistance at 23° C. 50% humidity of lower than or equal to about 100 g/m 2 . 
     
     
         11 . The paper product of  claim 1 , wherein the paper product displays a water drop resistance of greater than or equal to about 10 min. 
     
     
         12 . The paper product of  claim 3 , wherein the transparency agent is present in the paper product in an amount greater than or equal to about 5% by weight. 
     
     
         13 . A packaging paper comprising the paper product of  claim 1 . 
     
     
         14 . A paper product comprising:
 a fibrous web comprising cellulose fibers; and   a coating on a surface of the fibrous web, the coating comprising a transparency agent, the transparency agent comprising at least about 95% by weight of a bio-based wax or oil.   
     
     
         15 . The paper product of  claim 14 , wherein the paper product displays an opacity of less than or equal to about 40%. 
     
     
         16 . The paper product of  claim 15 , wherein the fibrous web has a basis weight of less than or equal to about 30 g/m 2  and a thickness of about 50 μm to about 20 μm. 
     
     
         17 . A paper product comprising:
 a fibrous web comprising cellulose fibers, wherein the fibrous web has a basis weight of about 10 g/m 2  to about 30 g/m 2  and a thickness of about 50 μm to about 20 μm; and   wherein the paper product displays an opacity of less than or equal to about 40%.   
     
     
         18 . The paper product of  claim 17 , further comprising a coating on a surface of the fibrous web comprising a transparency agent, the transparency agent comprising at least about 95% by weight of a bio-based wax or oil. 
     
     
         19 . The paper product of  claim 17 , wherein the paper product displays an opacity of less than or equal to about 30%. 
     
     
         20 . The paper product of  claim 17 , wherein the cellulose fibers have a Schopper-Riegler freeness value in the range of about 70° SR to about 90° SR.