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Water-based polyurethane-polyethylene compositions

a polymer composition and water-based technology, applied in the field of polyurethane polymers, can solve the problems of significant gelling of polymer, high viscosity of pre-polymer blends that cannot be easily dispersed in water,

Inactive Publication Date: 2007-02-01
VALSPAR SOURCING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010] The invention also provides polyurethane polymer compositions having low or substantially zero volatile organic content (VOC). The compositions will have a VOC of less than about 5% based on the total weight of the composition. Preferably, the VOC of the composition is less than about 3% based on the total weight of the composition. More preferably, the VOC of the composition is less than about 1% based on the total weight of the composition. Most preferably, the VOC of the composition is substantially zero % based on the total weight of the composition. The compositions of the invention are self-crosslinkable oil and / or fatty acid modified polyurethane-polyethylene compositions that are air curable, dry rapidly at room temperature, and produce a coating that is resistant to abrasions, chemicals and stains.
[0011] These and other advantages of the present invention will become more apparent by referring to the detailed description and illustrative examples of the invention.

Problems solved by technology

However, this results in highly viscous prepolymer blends that cannot be easily dispersed in water.
The products using a high percentage of pre-crosslinking of the prepolymer at the dispersion stage using chain extenders, having more than two reactive functional groups can result in significant gelling of the polymer.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of SSIPA Functional Alkyd

Step A

[0059] A reactor was charged with 11.8 parts SSIPA, 20.7 parts neopentyl glycol, and 950 ppm of Fascat 4100 tin catalyst from Elf Atochem. The reaction mixture was heated and stirred for about 4 hours and water was removed. The mixture was heated and tested until a test sample has an acid number of less than 2 mg of KOH / gram. Linoleic Acid (67.5 parts) was added to the mixture and the reaction cooled to room temperature.

Step B

[0060] The reaction product prepared in Step A (52 parts) was combined with 16 parts of trimethylol propane, 11.2 parts isophthalic acid and 333 ppm Fascat 4100 tin catalyst from Elf Atochem. The mixture was heated and stirred for about 3.5 hours until an acid number of less than 5 mg of KOH / gram was achieved.

[0061] The physical properties of the SSIPA functional alkyd were:

[0062] MW=537 OH#=201 AV<4.0.

example 2

Preparation of a Water Dispersible SSIPA Functional Polyurethane-Polyethylene Polymer

[0063] The SSIPA functionalized alkyd, prepared in Example 1, 272 grams, was reacted with 54 grams of toluene diisocyanate in the presence of 80.3 grams methyl methacrylate (MMA) and 75 ppm 2,6 Di-tert-butyl-4-methylphenol under an air sparge. The mixture was heated to 60° C. and stirred until the free isocyanate level was <0.3% as determined by titration with hydrochloric acid.

[0064] A dispersion of the polyurethane polymer blend was prepared by addition of 365 grams of deionized water. The free radical polymerization of the MMA was conducted using a redox initiation system of t-butyl hydroperoxide (70% solution in water) (1.2 grams) diluted with 200 grams of deionized water and isoascorbic acid (0.8 grams) diluted with 20 grams of deionized water. The isoascorbic acid solution was neutralized with aqueous ammonia to a pH of 7-8 and added to the polyurethane dispersion. The t-butyl hydroperoxide...

example 3

Preparation of LSIPA Functional Alkyd

[0066] A reactor was charged with 135 parts LSIPA, 397.5 parts DEG, 157.5 parts TMP, and 1500 ppm of Fascat 4100 tin catalyst from Elf Atochem. The reaction mixture was heated and stirred for about 4 hours and water was removed. The mixture was heated and tested until a sample has an acid number of less than 2 mg of KOH / gram. 300 parts soya fatty acid and 510 parts AA were then added to the mixture, and the mixture was heated and stirred for about 4.0 hours until an acid number of less than 5 mg of KOH / gram was achieved.

[0067] The physical properties of the LSIPA functional alkyd were:

[0068] MW=1343 OH#=83 AV<4.0.

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Abstract

The present invention provides water dispersible polyurethane-polyethylene compositions (or dispersions) having a sulfonated polyurethane polymer and a polyethylene polymer (second polymer). The polyurethane polymer is a reaction product of a polyisocyanate, and a sulfonated polyol.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority from U.S. provisional patent application Ser. No. 60 / 494,667, filed Aug. 13, 2003; which is incorporated herein by reference.BACKGROUND OF THE INVENTION [0002] The present invention relates to polyurethane polymers, particularly air curable water-based polyurethane-polyethylene polymer compositions, and more particularly, air curable water based polyurethane-polyethylene polymer dispersions suitable for coatings such as, for example, floor coatings. [0003] Polyurethane (PU) polymers are known in the coating industry to be useful as a part of polymeric coatings because they have excellent resistance to abrasion, chemicals and solvents. These polymers can be designed to be highly flexible and very durable. Conventional oil modified polyurethane polymers are prepared in organic solvents such as aliphatic hydrocarbons and applied as clear or pigmented coatings. After application, the solvent is allowed to ev...

Claims

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Application Information

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IPC IPC(8): C08G18/08C08F265/04C08F265/06C08F290/06C08G18/10C08G18/42C08G18/46C08G18/68C08L33/12C08L51/00C09D175/06C09D175/14
CPCC08F265/04C08F265/06C09D175/14C09D175/06C08L51/003C08L33/12C08G18/683C08G18/4676C08G18/4288C08F290/067C08G18/0828C08G18/0866C08G18/10C08G18/3228C08L2666/02C08L2666/04
Inventor KILLILEA, T. HOWARD
Owner VALSPAR SOURCING INC
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