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Fluorochemical water and oil repellents

A polymer, fluorocarbon alcohol technology, applied in chemical instruments and methods, fabrics, transportation and packaging, etc., can solve problems such as lack of oil repellency and stain resistance of leather

Inactive Publication Date: 2002-09-18
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the leather is cut during the manufacture of the article, or when the surface of the finished article is damaged by the abrasive action of use, the exposed leather lacks oil repellency and stain resistance

Method used

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  • Fluorochemical water and oil repellents
  • Fluorochemical water and oil repellents

Examples

Experimental program
Comparison scheme
Effect test

test approach 1

[0057] Oil and water repellency ratings give a measure of the theoretical ability of a surface treatment to prevent water and oil from wetting a substrate surface. Typically, Test Methods 1 and 2 are used to test treated Type A substrate samples. These tests are essentially very similar to Test Methods 3 and 4 for Class B substrate samples, with minor changes to accommodate different sample characteristics. Because the surface properties of substrates vary widely within classes, the choice of test method was determined by applying a drop of water to an untreated substrate surface and observing the drop for 30 seconds. If the droplets are absorbed (fibrous substrates, porous surfaces such as biscuit ceramics), use Test Methods 3 and 4 to test the treated substrate. Penetration or wetting of the test surface indicates failure of the test liquid, otherwise the test liquid passes the test. If water droplets are not absorbed in this screening test, as occurs in leather, non-porou...

test approach 2

[0063] * Compositions are calculated by volume at 21°C. Test Method 2 Water Drop Rating Test for Class A Substrates

[0064] A standard test drop is placed on the substrate surface and the wetting and contact angle are observed. The composition of the aqueous test liquid is shown in Table 5 below. The water repellency rating is the highest numbered test fluid that does not wet the substrate surface using the evaluation method above.

[0065] Starting with the lowest numbered test liquid, 3 small drops were placed in several places on the surface of the substrate. Observe the droplet from an angle of approximately 45 degrees for 30 seconds. If the water does not wet the substrate around the edge of the drop and the drop maintains the same contact angle, place a drop of the next highest numbered test liquid on the adjacent site on the substrate and observe again for 30 seconds.

[0066] Continue this procedure until a test liquid shows significant wetting of the surface und...

test approach 4

[0069] The oil repellency rating of the substrate is the highest numbered test liquid for which two out of three drops remained spherical to hemispherical and did not wick within 30 seconds. Test Method 4 Water Repellency of Type B Substrates

[0070] The water repellency test measures the ability of a treated substrate to resist wetting by an aqueous liquid. Droplets of water-alcohol mixtures of different surface tensions were placed on the substrate and the degree of surface wetting was determined visually. This test provides a rough index of water stain resistance. The higher the water repellency rating, the better the finished substrate's resistance to contamination by water-based substances. The composition of the standard test liquid is as shown in Table 5 above. Material

[0071] The following materials were used in the examples below:

[0072] 18-CROWN-6 is 1,4,7,10,13,16-hexaoxacyclooctadecane available from Aldrich, Milwaukee, WI.

[0073] DESMODUR N-100 and DE...

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PUM

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Abstract

A polymer having at least one urea linkage derived by contacting (1) at least one polyisocyanate, or mixture of polyisocyanates, (2) at least one fluorocarbon alcohol, fluorocarbon thiol or fluorocarbon amine, (3) at least one straight or branched chain alcohol, amine or thiol, and (4) at least one alcohol containing a sulfonic acid group or its salt, and then (5) optionally at least one linking agent useful for imparting oil repellency and water repellency to substrates.

Description

field of invention [0001] This invention relates to fluorochemical compositions for providing water and oil repellency to substrates. The invention further relates to methods for imparting oil and water repellency to various substrates and the resulting treated substrates. Background of the invention [0002] The tanning of leather is a complex process described eg in the Kirk-Othmer Encyclopedia of Chemical Technology, 4th Edition, Vol. 15, pp. 159-176. Leather produced from animal hides is used for many purposes including shoes, upholstery, clothing, gloves, hats, books, sports equipment, and more. In most of these uses, water repellency is required and is usually obtained by application of fat, or by surface treatment of the leather after drying. Fats applied to the leather did not provide any oil repellency. Oil and stain repellency of leather is also a desirable property in most of these uses, but more difficult to produce. Limited oil repelle...

Claims

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Application Information

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IPC IPC(8): C08G18/08C08G18/38C08G18/72C09D175/00C09K3/18C14C9/00
CPCC08G18/0828C08G18/3812C14C9/00Y10T428/31562Y10T428/31565Y10T428/31558Y10T428/31598Y10T442/2172Y10T442/2189C08G18/30
Inventor T·W·德尔佩斯科J·R·基希纳A·H·刘
Owner EI DU PONT DE NEMOURS & CO
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