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Multi-stage polymer as grinding additive and method of producing same

A polymer, multi-stage technology, applied in the direction of coating, etc., can solve the problems of insufficient dispersion of pigments, low long-term viscosity stability, etc.

Active Publication Date: 2018-07-17
DOW GLOBAL TECH LLC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the combination of hydrophobic dispersants with HASE produced insufficient dispersion of pigments and reduced long-term viscosity stability in coating compositions

Method used

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  • Multi-stage polymer as grinding additive and method of producing same
  • Multi-stage polymer as grinding additive and method of producing same
  • Multi-stage polymer as grinding additive and method of producing same

Examples

Experimental program
Comparison scheme
Effect test

example

[0066] I. Raw materials

[0067] Table 1 Materials used to make polymer compounds

[0068]

[0069]

[0070] Table 2 Starting materials used in paint formulations

[0071]

[0072] II. Process

[0073] performance evaluation method

[0074] i) Viscosity

[0075] Formulated paints were obtained as control formulations and inventive formulations. "KU viscosity" is a measure of mid-shear viscosity as measured by a Krebs viscometer. The Krebs Viscometer is a rotating paddle viscometer conforming to ASTM-D562. KU viscosity was measured on a Brookfield Krebs Unit Viscometer KU-1+ available from Brookfield Engineering Labs (Middleboro, MA, USA). "KU" stands for Krebs unit.

[0076] "ICI" is high shear viscosity expressed in units of poise (P) and measured by an ICI cone and plate viscometer.

[0077] "Brookfield 4 / 6" is low shear viscosity expressed in centipoise (cP) and measured with axis 4 on a Brookfield viscometer at a low shear rate of 6 rpm. The Brookfield vi...

example 1

[0081] Example 1 (Comparative Example) - Multistage Polymer 1

[0082] This example illustrates the preparation of a multistage polymer that does not contain phosphorus-containing monomers (PEM) and has the following weight composition: 70(47EA / 48MAA / 5MA-20 / / 0.08n-DDM) / / 30(70EHA / 30MAA / 2.55MMP).

[0083] A 5-liter four-necked flask equipped with a mechanical stirrer, nitrogen purge, thermocouple and condenser was fed with 720 g of water and 34.32 g of Disponil TM Fes32. The kettle solution was heated at 86°C. Addition of initiator: 1.30 grams of APS dissolved in 26 grams of water. After two minutes, a first stage monomer emulsion in 630 grams of water was added: 408.60 grams of ethyl acrylate (EA), 405.10 grams of methacrylic acid (MAA), 62.10 grams of MA-20, 0.70 grams of nDDM and 24.03 grams of Disponil TM Fes32. Simultaneously, the initiator: 0.37 grams of APS dissolved in 77 grams of water was co-fed over a period of 60 minutes while maintaining the kettle temperatu...

example 2

[0084] Example 2 (Working Example) - Multi-Stage Polymer 2

[0085] This example illustrates the preparation of a multi-stage polymer of the invention for use as a grinding additive with the following weight composition: 70(47EA / 48MAA / 5MA-20 / / 0.08n-DDM) / / 30(65EHA / 30MAA / 5PEM / / 2.55 MMP).

[0086]A 5 liter four-necked flask equipped with a mechanical stirrer, nitrogen purge, thermocouple and condenser was fed with 705 grams of water and 24.04 grams of Disponil™ Fes32. The kettle solution was heated at 86°C. Addition of initiator: 1.30 g of APS dissolved in 15 g of water. After two minutes, the first stage monomer emulsion in 350 grams of water was added: 286.02 grams of ethyl acrylate (EA), 283.57 grams of methacrylic acid (MAA), 43.47 grams of MA-20, 0.49 grams of nDDM and 16.82 grams of Disponil TM Fes32. Simultaneously, the initiator: 0.37 grams of APS dissolved in 70 grams of water was co-fed over a period of 60 minutes while maintaining the kettle temperature at 86°C. ...

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PUM

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Abstract

This invention generally relates to a multi-stage polymer suitable for a grinding additive, a method for producing the multi-stage polymer, a composition and a paint composition comprising the multi-stage polymer and a use of the multi-stage polymer for a grinding additive of a paint composition.

Description

technical field [0001] The present invention relates generally to multi-stage polymers suitable for use in grinding additives, methods of making said multi-stage polymers, compositions and coating compositions comprising said multi-stage polymers and the use of said multi-stage polymers in coating compositions The use of grinding additives for materials. Background technique [0002] In a typical paint manufacturing process, dispersants are added during the milling stage to help stabilize the dispersion of pigments and extenders. Polyacid homopolymers or copolymers are often used as dispersants. At the same grinding stage, thickeners are added to provide a high enough viscosity to grind the pigments / extenders to a fine size and to provide the proper viscosity for the final paint. A thickener commonly used in the milling stage is hydroxyethyl cellulose (HEC). During the letdown stage, more thickener is added to achieve the target viscosity of the final paint. In the field...

Claims

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Application Information

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IPC IPC(8): C08F265/02C08F265/04
CPCC08F265/04C09D151/003C09D5/024C09D7/43C09D7/41C09D7/61C08F220/1802C08F220/1808C08F220/06C08F230/02C08F220/286C09D7/65C09D133/06
Inventor 李湖杨伟君王涛黄新辉蒋思媛陈成辉
Owner DOW GLOBAL TECH LLC