Rheological Methods For High Block, Tack and Scrub Resistant Coating Composition

a technology of rheological methods and coating compositions, applied in anti-corrosion paints, coatings, carboxyl rubber coatings, etc., can solve the problems of poor performance characteristics of low voc colorants, poor and the formation of hard film is even more difficult. , to achieve the effect of excellent tack resistance, block resistance and scrub resistan

Active Publication Date: 2020-01-09
SWIMC LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The multistage latex polymers enable the formation of paints with excellent tack, block, and scrub resistance, even at high colorant loads, and provide a quantitative method to predict paint performance using rheological properties.

Problems solved by technology

However, typical low VOC paints with low VOC colorants tend to form soft, tacky coatings that show poor performance characteristics, such as poor block resistance and poor scrub resistance, for example.
This situation is further complicated in deeply colored paint formulations that require high loading of the low VOC or zero-VOC colorants, which generally have residual non-volatile soft components, making hard film formation even more difficult.
Such tests are only semi-quantitative and do not provide insight into structure property relationships.
Moreover, some of the conventional methods are known to have low repeatability, and ratings taken by different operators and / or at different times may vary considerably.
Therefore, it is often difficult to predict performance characteristics of a paint formulation relying on conventional methods of testing.

Method used

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  • Rheological Methods For High Block, Tack and Scrub Resistant Coating Composition

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of White High Gloss Formulation (Comparative)

[0091]A 100-gallon formulation of a white high-gloss paint was prepared using the ingredients listed in Table 1. The polymer in Table 1 is a commercially available latex polymer system known to provide optimal block resistance (Rhoplex™ HG706, available from Dow).

TABLE 1White High-gloss Formulation #1 Raw Material Amount (lbs)Water 159 Dispersant 7.0 Surfactant 3.5 Defoamer 1.0 Pigment 225.0 Polymer 620.0 Coalescent 8.3 Defoamer 5.2 Neutralizing Agent 1.0 High-shear Thickener 6.8 Low-shear Thickener 4 Total 1040.8

example 2

Preparation of White High-Gloss Formulation (Inventive)

[0092]A 100-gallon formulation of a white high-gloss paint was prepared using the ingredients listed in Table 2. The polymer in Table 2 is a multistage latex composition prepared by a sequential monomer feed process as described above, and including at least a first stage and a second stage.

TABLE 2White High-Gloss Formulation #2 Raw Material Amount (lbs)Water 187.1 Dispersant 7.0 Surfactant 3.5 Defoamer 1.0 Pigment 225.0 Polymer 582.0 Coalescent 12.5 Defoamer 5.2 Neutralizing Agent 1.0 High-shear Thickener 6.8 Low-shear Thickener 4 Total 1035.0

example 3

Clear High-Gloss Formulation (Comparative)

[0093]A 100-gallon formulation of a clear high-gloss base paint was prepared using the ingredients listed in Table 3. The polymer in Table 3 is a commercially available latex polymer system known to provide optimal block resistance. (Rhoplex™ HG706, available from Dow).

TABLE 3Clear High-Gloss Formulation #3 Raw Material Amount (lbs)Water 124.1 Polymer 696 Defoamer 1.0 Surfactant 5.0 Neutralizing Agent 5.5 Coalescent 9.2 High-Shear Thickener 18 Low-Shear Thickener 14.5 Total 873.3

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Abstract

The present invention is directed to a coating composition or paint comprising a multistage latex with at least first and second stages, wherein the composition or paint is substantially free of volatile organic compounds (VOC) and capable of film formation even in the absence of coalescent agents. The base paint formulation is capable of being tinted at a point-of-sale (i.e. in-store) using a colorant composition of a type and quantity required to produce a paint of desired color and finish. The paints, show improved block resistance, scrub resistance and tack resistance. Rheological techniques as described herein may be used to determine tack resistance, print resistance, and other performance characteristics.

Description

CROSS REFERENCE TO RELATED APPLICATION(S)[0001]This application is a continuation in part of U.S. application Ser. No. 15 / 012,240 filed on 1 Feb. 2016 and entitled: “High Block, Tack and Scrub Resistant Coating Composition” incorporated by reference herein in its entirety.BACKGROUND OF THE INVENTION[0002]Conventionally, paint compositions containing latex polymer particles also include a coalescent in addition to pigments and fillers. The coalescent functions as a solvent as well as a plasticizer for the polymer particles to soften the latex polymer particles and assist in the formation of a continuous coating or film after applying to a surface and allowing to dry.[0003]Useful coalescents are generally stable in the presence of water, compatible with other ingredients typically used in paint formulations, particularly the latex polymers, such that the stability of the latex-based composition is not compromised. Typical coalescent agents contain volatile organic compounds (VOC) and ...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): C09D113/02C09D133/10C08F2/00C09D7/14C09D7/80
CPCC09D5/00C09D133/10C08K5/02C09D7/80C08F2/001C09D7/40C08L2201/54C09D133/26C08L2312/00C09D133/14C09D5/08C09D113/02C08L13/02
InventorEWERT, TESSIE ROSEBELL, TYLERSANDOVAL, ROBERTHIBBEN, MARY JANE
OwnerSWIMC LLC