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

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Problems solved by technology

Therefore, when the leather is cut during the manufacture of the article, or when the surface of the finished

Method used

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

Examples

Experimental program
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Effect test

Example

[0057] The oil and water repellency rating provides a measure of the theoretical ability of surface treatment to prevent water and oil from wetting the substrate surface. Generally, test methods 1 and 2 are used to test the processed A substrate samples. These tests are basically very similar to test methods 3 and 4 used for type B substrate samples, but with small changes to accommodate different sample characteristics. Because the surface properties of substrates vary greatly within the category, the choice of test method is determined by applying a drop of water on the surface of the untreated substrate and observing the drop for 30 seconds. If 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 the water droplets are not absorbed in this screening test, as occurs ...

Example

[0063] * The composition is calculated based on the volume at 21°C. Test method 2 Water drop rating test for type A substrate

[0064] The standard test drop is placed on the surface of the substrate 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 liquid that does not wet the surface of the substrate using the above evaluation method.

[0065] Starting with the lowest numbered test liquid, place 3 small drops on several positions 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 droplet and the droplet maintains the same contact angle, place a drop of the highest numbered test liquid on the substrate and observe it again for 30 seconds.

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

Example

[0069] The oil repellency rating of the substrate is the highest numbered test liquid in which two of the three drops remain spherical to hemispherical and no wicking phenomenon occurs within 30 seconds. Test method 4 Water repellency of type B substrate

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

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

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

[0073] DESMODUR N-100 and...

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Abstract

A polymer having at least one urea bond obtained by making (1) at least one polyisocyanate, or a mixture of polyisocyanates, (2) at least one fluorocarbon alcohol, fluorocarbon mercaptan, or fluorocarbon amine, (3) At least one linear or branched chain alcohol, amine or thiol, and (4) at least one alcohol containing a sulfonic acid group or a salt thereof, followed by (5) optional at least one coupling agent are contacted to obtain , which can be used to impart oil 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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