Moistureproof paper having shading property and recyclability

Details Moistureproof paper having shading property and recyclability Moistureproof paper having shading property and recyclability

1998-02-09

2000-09-12

Hess, Bruce H.

Stock material or miscellaneous articles

Composite

Of carbohydrate

428342, 4284881, 428507, B32B 2900

Patent

active

061175633

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE TECHNOLOGY

The present invention relates to a moistureproof paper which is used for wrapping papers of light-sensitive materials, heat-sensitive recording papers, photographic printing papers, and the like. In particular, relates to a moistureproof paper which is not only extremely excellent in defibration properties and reusing properties as recycling properties of waste papers, and heat-sealing properties, but also has light-proofing properties.


BACKGROUND OF THE TECHNOLOGY

As moistureproof papers, tarpaulin papers and wax papers were formerly known. At present, papers having a high-molecular weight compound, such as polyethylene, polypropylene and polyvinyl chloride, coated or laminated thereon to impart moistureproof and waterproof properties are generally used. However, while the above-described moistureproof papers could thoroughly exhibit the function with respect to the moistureproof properties, they were extremely poor in defibration properties at the time of collection and reuse as a waste paper were difficult. For this reason, a big problem still remained from the view-points of saving of natural resources, effective use, and the like.
As papers which solve the above-described defects and are superior in moistureproof and waterproof properties and defibration properties as waste papers and processes for producing the same, those using a wax-based emulsion alone or a mixed solution of a wax-based emulsion with a synthetic rubber-based latex (refer to the official gazette of Patent Publication No. 3-10759), those using a mixed solution of an acrylic emulsion with a wax-based emulsion (refer to the official gazette of Patent Publication No. 2-1671 and the official gazette of Patent Application Laid-Open No. 6-200498), and the like are known. However, while the moistureproof and waterproof papers produced by each of these processes provided a capacity comparable to the existing moistureproof papers with respect to the moistureproof and waterproof properties, they were not satisfactory in obtaining other necessary qualities.
For example, moistureproof papers obtained by coating a wax-based emulsion involved such defects that they cause a reduction in the coefficient of friction, they are very inferior in moistureproof properties when folded, and that when they are reused waste-paper stock, a large amount of the wax contained in the waste-paper stock adheres to rolls and the like of a paper machine to generate roll stains, whereby the recycling properties are greatly deteriorated. The moistureproof papers produced by coating a mixture of a synthetic rubber-based latex with a wax-based emulsion as disclosed in the official gazette of Patent Publication No. 3-10759 were very inferior in the heat-sealing capacity which is required for sealing and further not satisfactory yet in the defibration properties as the collection properties of waste papers. Further, inferiority in the heat-sealing capacity entails use of gummed tapes or adhesives such as those using vinyl acetate for sealing of wrapping papers. For this reason, the tape or adhesive adheres to the moistureproof paper sealed by such materials and adversely affects the defibration properties at the time of recycling, resulting in a big obstacle for the reuse from the standpoint of practical use.
In addition, the moistureproof papers produced by coating a mixture of an acrylic emulsion with a wax-based emulsion as disclosed in the official gazette of Patent Publication No. 2-1671 and the official gazette of Patent Application Laid-Open No. 6-200498 involved the following defects. In the official gazette of Patent Publication No. 2-1671, the heat-sealing properties and defibration properties are not at all mentioned. Also, the amount of the wax-based emulsion used was so high as from 90:10 to 50:50, (preferably 70:30 to 60:40) in terms of a mixing ratio of the acrylic resin to the wax as a solids content, resulting in a reduction in the coefficient of friction of moistureproof papers, and the paper-making properties were not yet sati

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