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Thickener composition and method for thickening aqueous system

A technology of composition and thickener, applied in chemical instruments and methods, pharmaceutical formulations, adhesive additives, etc., can solve the problem of high viscosity of aqueous mixtures

Active Publication Date: 2009-04-15
ROHM & HAAS CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has not been possible to date to mix pH-independent soluble associative thickeners with ASE or HASE thickeners in the form of low pH emulsions at practical solids weight levels due to the rather high viscosity of aqueous mixtures , essentially exists as a gel

Method used

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  • Thickener composition and method for thickening aqueous system
  • Thickener composition and method for thickening aqueous system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] Example 1. Synthesis of acid inhibitable HEUR thickener, EX.1

[0113] A mixture of 400.0 grams of PEG (molecular weight 8000) and 650.0 grams of toluene was dried by azeotropic distillation. The mixture was cooled to 90°C and 40.17 grams of HMDI and 0.42 grams of dibutyltin dilaurate were added. After stirring at 90°C for 1 hour, the reaction mixture was cooled to 80°C. Then, a mixture of 53.93 g of bis(2-ethylhexyl)aminoethanol and 3.42 g of hexanol was added to the reactor, and then the mixture was stirred at 80°C for 1 hour. After cooling to room temperature, the resulting solid polymer was separated from the hexane by precipitation and vacuum filtration.

Embodiment 2

[0114] Example 2. The viscosity of the thickener used in the thickener mixture

[0115] The data in Table 1 (below) gives the viscosity of the thickener used in the thickener mixture (Bolifei viscosity, cp). SCT-275 and RM-825 are commercial HEUR thickeners (Rohm and Haas Company, Philadelphia, Pennsylvania, USA); RM-5 and ASE-60 are commercial HASE thickeners (Rohm and Haas Company, Philadelphia, Pennsylvania, USA); Ex. 1 is an acid-inhibited thickener (Example 1, above ).

[0116] Table 1. Thickener viscosity (25℃)

[0117]

Embodiment 3

[0118] Example 3. Viscosity of thickener mixture

[0119] Prepare a mixture of various thickeners as shown in Table 2 below. Except for the gelation of the mixture, use a laboratory bench mixer to mix the mixture for 10 minutes. In these cases, the mixture (mixtures M1, M2, M5, and M6) gelled in less than 3 minutes. Use rotor #4 to measure the viscosity on a Bolivier viscometer at 25°C at 60 rpm.

[0120] Table 2. Viscosity of thickener mixture

[0121]

[0122] The mixture of HEUR thickener and HASE thickener (M1 and M2) gels quickly and cannot be used as a commercial thickener mixture. The mixture of HEUR thickener and ASE thickener (M5 and M6) also gelled quickly. However, the viscosity ratio of the thickener mixture of the present invention (acid-inhibited thickener and HASE thickener, mixtures M3, M7 and M8; acid-inhibited thickener and ASE thickener, M4) The acid inhibitable thickener has a low initial viscosity. The thickener mixture of the present invention is compatible...

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Abstract

A composition and method whereby the same group that is attached to or within the backbone of an associative thickener is reversibly switched between being hydrophilic and hydrophobic in nature. When the group that is attached to or within the backbone is rendered hydrophilic, the aqueous thickener is pourable and readily incorporated into aqueous polymer compositions. When this group is rendered hydrophobic, the thickener performs its thickening function efficiently. Switching is readily accomplished by adjusting the pH of the associative thickener composition and the aqueous polymer composition being thickened.

Description

[0001] Cross reference to related applications [0002] The present invention requires U.S. Provisional Patent Application No. 60 / 919209 filed on March 21, 2007, U.S. Provisional Patent Application No. 61 / 009153 filed on December 26, 2007, and U.S. Application No. filed on October 11, 2007 Priority No. 11 / 974071. Technical field [0003] The present invention relates to mixtures of aqueous thickener polymer compositions and methods for their use. Specifically, one aspect of the present invention relates to an aqueous mixture of the following substances: associative thickeners, which can be dissolved in water in a wide pH range; and low pH, insoluble and emulsion forms with hydrophobic modification or Non-hydrophobic modified alkali-soluble or alkali-swellable emulsions (HASE or ASE thickeners, respectively). Background technique [0004] Aqueous polymer systems, such as coatings with oxygen-containing emulsion polymer binders, typically use thickeners to achieve the desired viscos...

Claims

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Application Information

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IPC IPC(8): C08L71/00C08L33/26C08L5/00C08L29/04C08L101/00C09K3/00C09D7/12C09J11/08A61K47/30
Inventor J·M·哈利斯B·R·鲍博森
Owner ROHM & HAAS CO
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