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Coating emulsion composition, and water/oil-repellent paper and making method

a technology of water/oil repellency paper and composition, applied in papermaking, transportation and packaging, bandages, etc., can solve the problems of difficult to provide a sufficient level fold-up portions suffer noticeable loss of etc., to and improve water and oil repellency

Inactive Publication Date: 2008-07-24
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0021]By coating a surface of a paper substrate with a water- and oil-repellent composition primarily comprising an aqueous silicone resin emulsion, a paper sheet with improved water and oil repellency is easily prepared.
[0022]The paper sheet of the invention has improved water and oil repellency due to the silicone resin layer having water and oil repellency and release property, and even when folded, maintains the repellency with little losses or at the practically acceptable level in the folded portion. Thus the water- and oil-repellent paper sheet is useful in commercial food packages and wrappers for packaging or wrapping a variety of oily food items such as fried items and oil and fat-containing foods.

Problems solved by technology

Problems arise, however, when they are applied to films, paper sheets, and other substrates having a relatively smooth surface to form a thin coating thereon.
As compared with the prior art water- and oil-repellent paper sheets having organic fluororesins incorporated therein, those paper sheets having a water- and oil-repellent layer formed on a paper substrate for insuring safety are difficult to provide a sufficient level of water and oil repellency.
It is pointed out that particularly when the paper sheets are folded for use as boxes or base sheets, the folded portions suffer from noticeable losses of water and oil repellency.

Method used

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  • Coating emulsion composition, and water/oil-repellent paper and making method
  • Coating emulsion composition, and water/oil-repellent paper and making method
  • Coating emulsion composition, and water/oil-repellent paper and making method

Examples

Experimental program
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Effect test

first embodiment

[0024]Described below are components in the coating emulsion composition according to the first embodiment of the invention.

[0025]Component (A) is an organopolysiloxane containing at least two silicon-bonded hydroxyl groups in a molecule, and typically an organopolysiloxane having the average compositional formula (1):

Herein R is each independently a C1-C20 alkyl group or a C6-C20 aryl group. X is each independently a C1-C20 alkoxy group or a hydroxyl group, with the proviso that at least two X's are hydroxyl groups. The subscript “a” is 0 or a positive number of 0<a≦1,000, “b” is a positive number of 100≦b≦10,000, “c” is 0 or a positive number of 0<c≦1,000, 100≦axc+b≦100,000, and r is 1, 2 or 3.

[0026]Specifically, R is each independently selected from C1-C20 alkyl groups and C6-C20 aryl groups, for example, chain-like alkyl groups such as methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, dodecyl, tetradecyl, hexadecyl, and octadecyl, cycloalkyl groups such a...

second embodiment

[0056]Next, the water- and oil-repellent paper sheet according to the second embodiment of the invention is described.

[0057]The water- and oil-repellent paper sheet includes a water- and oil-repellent, releasable silicone resin layer on at least one surface of a paper substrate.

[0058]The paper substrate used herein is not particularly limited. A choice of paper may be made depending on a particular application as long as a silicone resin layer can be formed on at least one surface thereof. Suitable paper substrates include kraft paper, wood-free paper, paper board, liner, glassine paper, and parchment paper. The fibrous material of which the paper substrate is made is not limited to cellulose and cellulose derivatives. Also, instead of paper substrates, woven fabrics and non-woven fabrics comprising fibers derived from raw materials other than cellulose and cellulose derivatives may be used as the substrate.

[0059]The silicone resin layer or coating has not only good water repellency...

synthesis example 1

[0089]A 2-L polyethylene beaker was charged with 498 g of octamethylcyclotetrasiloxane, 2 g of triethoxyphenylsilane, 50 g of 10% sodium laurylsulfate aqueous solution, and 50 g of 10% dodecylbenzenesulfonic acid aqueous solution. Using a homomixer, the components were emulsified uniformly, after which 400 g of water was slowly added for dilution. This was passed two times through a high-pressure homogenizer under a pressure of 30 MPa, obtaining a uniform white emulsion. The emulsion was transferred to a 2-L glass flask equipped with an agitator, thermometer, and reflux condenser where polymerization reaction was effected at 50° C. for 24 hours. It was allowed to mature at 10° C. for 24 hours before it was neutralized to pH 6.2 with 12 g of 10% sodium carbonate aqueous solution. This emulsion had a nonvolatile content of 45.4% after drying at 105° C. for 3 hours and contained an organopolysiloxane in a non-flowing soft gel form which had the average compositional formula shown below...

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Abstract

An organopolysiloxane containing at least two silicon-bonded hydroxyl groups, the reaction product of an amino-containing organoalkoxysilane with a dicarboxylic anhydride, and an organopolysiloxane containing long-chain alkyl and alkoxy groups, but free of hydroxyl groups are emulsified and dispersed in water in the presence of a surfactant to form a coating emulsion composition.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application Nos. 2006-279800 and 2006-279815 filed in Japan on Oct. 13, 2006 and Oct. 13, 2006, respectively, the entire contents of which are hereby incorporated by reference.TECHNICAL FIELD[0002]This invention relates to a coating emulsion composition featuring uniformity of coating. It also relates to a water- and oil-repellent paper and a method for preparing the same, the paper finding use in food packages and wrappers including base paper and wrappers for chocolate and snacks, paper boxes and bags for fried potato, fried chicken, doughnuts, crackers and cakes, and wrappers for hamburgers and fried items.BACKGROUND ART[0003]A number of cross-linking silicone emulsion compositions which cure into rubber coatings are known in the art, as disclosed in JP-A 5-98579 corresponding to U.S. Pat. No. 5,254,621, JP-A 8-85760, JP-A 9-208826 corresponding to U.S. P...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08L51/00B32B9/00
CPCC08J3/03C08J2383/04C08K5/544C08L83/06C09D183/04D21H19/16D21H21/16D21H19/32D21H19/62C08L83/00Y10T428/31663D21H19/00D21H19/40D21H19/46D21H19/64
Inventor OSAWA, YOSHIHITOYAMAMOTO, KENJIWATANABE, YASUNORI
Owner SHIN ETSU CHEM IND CO LTD
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