K-C patent for coated paper and process for making it expires in Canada; process included, among other steps, providing a layer with blend of pulp fibers and particulate material containing polyvalent metal cations

OTTAWA , June 22, 2014 () – Kimberly Clark Co's patent for coated paper and process for making the same has expired. This invention was developed by Hotaling Raymond Dwayne and Hampl Vladimir Jr.

The patent application number is CA19942126494 19940622. The patent publication number is CA2126494 (C). International Patent Classification codes are A24D1/02, B32B27/00, B32B27/10, C08B37/04, C08K3/10, C08L77/00, C08L97/00, C09D105/00, C09D105/04, D21H17/66, D21H17/67, D21H19/10, D21H19/16, D21H27/00, D21H27/10 and (IPC1-7): D21H19/16. Cooperative Patent Classification codes are A24D1/025, D21H17/66 and D21H19/16.

According to the abstract released by the Canadian Intellectual Property Office: "Disclosed is a process of making a coated paper including the following steps: 1) providing a paper layer composed of a blend of pulp fibers and particulate material containing polyvalent metal cations, 2 ) applying a solution of a material selected from salts and derivatives of alginic acid to cover at least a portion of the paper, 3) reacting the salts and/or derivatives of alginic acid with polyvalent metal cations in the paper to form a polymer coating, and 4) drying the paper and polymer coating. The permeability of the coated paper is generally at least about 75 percent less than the permeability of an identical uncoated portion of the paper. The solution of alginate material may be acidified and/or partially cross-linked. The alginate solution may be deposited utilizing gravure printing techniques. Also disclosed is a coated paper and a wrapper for a smoking article."

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