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Polymer dispersions having multimodal particle size distribution

A multimodal particle size and polymer technology, applied in the field of polymer dispersion, can solve problems such as difficult control and limited applicability

Inactive Publication Date: 2015-02-25
CELANESE SALES GERMANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this approach has proven difficult to control in practice and has been found to be of limited applicability

Method used

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  • Polymer dispersions having multimodal particle size distribution
  • Polymer dispersions having multimodal particle size distribution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] To prepare the aqueous phase, 1.1 parts of S-PVOH-1, 0.47 parts of S-PVOH-2 and 0.95 parts of Poval KL-506 were used. The starting initiator solution consisted of 0.05 parts sodium metabisulfite in 0.8 parts water and 0.05 active parts t-butyl hydroperoxide (70%) in 1.2 parts water.

[0082] The resulting emulsion had a viscosity of 2,520 mPa·s (major axis 3) at a solids content of 57.0%.

[0083] The PSD shows two different particle fractions with maxima at dw = 0.58 microns (40%) and dw = 3.60 microns (60%). Micrographs of this PSD are shown in figure 1 middle. The second particle fraction was found to consist of roughly spherical, largely unagglomerated particles.

Embodiment 2

[0085] Example 1 was repeated, but the starting initiator solution consisted of 0.025 parts sodium metabisulfite in 0.8 parts water and 0.025 active parts t-butyl hydroperoxide (70%) in 1.2 parts water.

[0086] The resulting emulsion had a viscosity of 3,225 mPa·s (major axis 3) at a solids content of 57.2%.

[0087] The PSD shows two different particle fractions with maxima at dw = 0.58 microns (35%) and dw = 6.63 microns (65%). The second particle fraction was found to consist of roughly spherical, largely unagglomerated particles.

Embodiment 3

[0089] Example 1 was repeated, but the starting initiator solution consisted of 0.08 parts sodium metabisulfite in 0.8 parts water and 0.075 active parts t-butyl hydroperoxide (70%) in 1.2 parts water.

[0090] The resulting emulsion had a viscosity of 3,100 mPa·s (major axis 3) at a solids content of 57.2%.

[0091] The PSD shows two different particle fractions with maxima at dw = 0.31 microns (48%) and dw = 3.09 microns (48%). The smaller third fraction has a maximum value of dw=16.57 (4%). The second particle fraction was found to consist of roughly spherical, largely unagglomerated particles.

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Abstract

An aqueous polymer dispersion having a multimodal particle size distribution IS produced by emulsion polymerization of a mixture comprising at least one free-radically polymerizable monomer and a stabilizer composition comprising at least two different stabilizers, wherein one of the stabilizers comprises a polyvinyl alcohol having acid groups attached to its polymer backbone.

Description

technical field [0001] The present invention relates to polymer dispersions having a multimodal, especially bimodal, particle size distribution. Background of the invention [0002] Polymer dispersions with multimodal, especially bimodal, particle size distributions are used in a variety of applications, for example as binders for adhesives, paints and paper coating compositions. Multimodal polymer dispersions offer an advantage over their unimodal counterparts in that they generally provide higher solids content without the dispersion becoming too viscous or swollen. For example, with unimodal polymer dispersions, it is difficult to achieve 60 wt% solids without viscosity problems, whereas stable multimodal dispersions with acceptable viscosity properties are readily produced at higher than 70 wt% solids. This difference is important because, for example, in the case of adhesive formulations, a higher binder solids content generally results in shorter setting times, wherea...

Claims

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Application Information

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IPC IPC(8): C08F2/24
CPCC08F2/28
Inventor M·雅各布M·若普尔特
Owner CELANESE SALES GERMANY