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Rheology modifier

A technology of hydrophobic modification and branching agent, which is applied in thixotropic coatings, other chemical processes, dyeing polymer organic compound treatment, etc., to achieve the effect of improving viscosity balance

Active Publication Date: 2012-07-04
ROHM & HAAS CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is desirable to increase the ICI viscosity and the efficiency of ICI viscosity enhancing rheology modifiers without the concomitant increase in KU viscosity because the increase in KU viscosity limits the ability of the formulation synthesizer to add rheology modifiers to the formulation that increase the KU viscosity

Method used

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Examples

Experimental program
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Embodiment 1

[0071] Example 1 -The CARBOWAX TM 8000 Polyethylene glycol (150 g) and toluene (360 g) were added to the vessel and dried by azeotropic distillation. The mixture was cooled to 90°C and Desmodur N3600 polyisocyanate (1.36 g) was added to the mixture. The mixture was stirred for 5 minutes, then dibutyltin dilaurate (0.21 g) was added. The mixture was stirred for 1 hour, then Desmodur H (4.15 g) was added. Stirring was continued for a further 1 hour, then cooled to 80°C. n-Decanol (3.91 g) was then added to the mixture and stirring was continued for a further 1 hour. The mixture was cooled to 60°C and the polymer was isolated by rotary evaporation. The ICI and KU viscosities were found to be 2.40 poise and 90.2 Krebs units, respectively. M measured by SEC w 79,000, M w / M n The polydispersity is equal to 3.1.

[0072] Although the types and amounts of raw materials used to prepare the polymers of Comparative Example 1 and Example 1 are the same, the products of Exampl...

Embodiment 2

[0074] Will CARBOWAX TM 8000 A mixture of polyethylene glycol (150 g) and toluene (360 g) was charged to a vessel and dried by azeotropic distillation. The mixture was cooled to 90°C and Desmodur N3600 polyisocyanate (1.81 g) was added to the mixture. The mixture was stirred for 5 minutes, then dibutyltin dilaurate (0.21 g) was added. The mixture was stirred for 1 hour, then Desmodur H (3.94 g) was added. Stirring was continued for a further 1 hour, then cooled to 80°C. n-Decanol (3.91 g) was then added to the mixture and stirring was continued for a further 1 hour. The mixture was cooled to 60°C and the polymer was isolated by rotary evaporation. The ICI and KU viscosities were found to be 2.80 poise and 109.1 Krebs units, respectively. M measured by SEC w 124,000, M w / M n The polydispersity is equal to 4.4.

[0075] Likewise, compared with Comparative Example 2, the ICI / KU viscosity curve of Example 2 is better.

[0076] The samples prepared above were subjected ...

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Abstract

The present invention relates to a composition comprising a hydrophobically modified alkylene oxide polyurethane characterized by having a M w of from 50,000 to about 150,000 Daltons and a polydispersity of 2.5 to about 5.0. The present invention further relates to a multi-step process for the preparation of the hydrophobically modified polymer.

Description

technical field [0001] This invention relates to hydrophobically modified urethane polymers which are useful as rheology modifiers in aqueous coating formulations. Background of the invention [0002] Rheology modifiers can be used in waterborne coating formulations to control viscosity over a wide range of shear rates. They can be associative (they associate with the dispersed phase) or non-associative (they thicken the aqueous phase). Associative thickeners can be derived from natural products such as hydrophobically modified cellulose ethers, or prepared from synthetic polymers such as hydrophobically modified ethylene oxide urethane (HEUR) polymers. A typical description of HEUR polymers and their preparation can be found in US 2009 / 0318595 A1 which describes the formation of linear and a combination of branched HEUR polymers. [0003] U.S. 4,155,892 (Emmons et al.) describes the preparation of linear and branched HEUR polymers in various examples. [0004] Rheology ...

Claims

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Application Information

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IPC IPC(8): C08G18/79C08G18/66C08G18/48C08G18/32C09C3/10C09D7/12
CPCC08G18/831C08L75/08C08G18/10C08G18/4833C08G18/792C09D7/002C09D7/43C08G18/73C08G18/2825C08L75/04C09D5/04C09D201/00C09K3/00C08G18/725C08G18/7843
Inventor J·J·拉巴斯科B·R·博布辛
Owner ROHM & HAAS CO
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