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Latex paint containing titanium dioxide pigment

A technology of latex paint and polymer latex, applied in the field of latex paint, can solve problems such as unsatisfactory and expensive preparation, and achieve the effects of good covering power and good scrub resistance

Inactive Publication Date: 2019-05-24
BASF SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] Proposed prior art for improving TiO 2 Methods for hiding or opacifying efficacy of pigments are unsatisfactory because either the polymer dispersion requires expensive phosphorus-containing monomers to achieve acceptable hiding or opacifying efficacy and flocculation stability, or the formulation requires additional expensive dispersion agent or cumbersome preparation of TiO 2 Pigment / polymer pre-composite method

Method used

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  • Latex paint containing titanium dioxide pigment
  • Latex paint containing titanium dioxide pigment
  • Latex paint containing titanium dioxide pigment

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0098] The preparation of latex is realized by multi-stage aqueous free-radical emulsion polymerization of monomer composition M, said multi-stage aqueous free-radical emulsion polymerization comprising: at least one stage S, wherein the relative amount of monomer M2 added in this stage is at least 6% by weight, based on the total amount of monomers added in said stage; and at least one other stage T, wherein the relative amount of monomer M2 added in this stage is less than 5% by weight, based on The total amount of monomer added in. Therefore, by separately adding the monomer composition M to the polymerization reaction S and M T to achieve different stages S and T, which differ at least with respect to the relative amounts of monomer M2 comprised in said composition. Obviously, the monomer composition M S is the monomer composition added in stage S, and the monomer composition M T is the monomer composition added in stage T.

[0099] Multi-stage aqueous free-radical emul...

Embodiment

[0216] 1. Analysis

[0217] 1.1 The solids content is determined by drying a defined amount of the aqueous polymer dispersion (approximately 2 g) to constant weight (approximately 2 hours) in an aluminum crucible with an internal diameter of approximately 5 cm in a drying cabinet at 120°C. Take two separate measurements. The values ​​reported in the examples are the average of two measurements.

[0218] 1.2 The particle size of the polymer latex was determined by using 0.1% by weight of nonionic surfactant (ethoxylated C16 / C18 alkanol with 18 ethylene oxide units) aqueous solution diluted to 0.001 to 0.5% by weight of the dynamic light scattering determination of the polymer aqueous dispersion. Recorded is the cumulant Z mean diameter calculated from the measured autocorrelation function (ISO standard 13321).

[0219] 1.3 The glass transition temperature is determined by the DSC method (differential scanning calorimetry, 20 K / min, midpoint measurement, DIN 53765:1994-03) wi...

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Abstract

The present invention relates to latex paints, which contain a) a multistage carboxylated polymer latex binder obtainable by multistage aqueous emulsion polymerisation of a monomer composition M consisting of at least one non-ionic monomer M1, which is selected from C1-C20-alkyl esters of acrylic acid, C1-C20-alkylesters of methacrylic acid, and vinyl aromatic monomers; one or more monoethylenically unsaturated monomers M2, which are selected from monoethylenically unsaturated monocarboxylic acids having 3 to 6 carbon atoms and monoethylenically unsaturated dicarboxylic acids having 4 to 6 carbon atoms, and optionally one or more non-ionic monomers M3, which are different from monomers M1; where in at least one stage, the relative amount of monomers M2 added in this stage is at least 6% byweight, based on the total amount of monomers added in said stage, the total amount of monomers M2 being from 0.05 to 5% by weight, based on the total amount of the monomer composition M; b) a titanium dioxide pigment; and c) a polymeric dispersant PD which is selected from homo and copolymers of monomers M4, which are selected from monoethylenically unsaturated monocarboxylic acids having 3 to 6carbon atoms and monoethylenically unsaturated dicarboxylic acids having 4 to 6 carbon atoms, where the monomers M4 make up at least 85% of the monomers forming the polymeric dispersant and where thepolymeric dispersant PD has a number average molecular weight, as determined by GPC, of at most 5500 Dalton.

Description

[0001] The present invention relates to latex paint, it contains [0002] a) a multi-stage carboxylated polymer latex adhesive obtainable by multi-stage aqueous emulsion polymerization; [0003] b) titanium dioxide pigments; and [0004] c) Polymer dispersant PD. [0005] The invention also relates to a process for the preparation of such latex paints and to the use of said latex paints for coating surfaces, in particular for coating interior or exterior walls and ceilings. technical background [0006] Titanium dioxide (TiO 2 ) are often used as pigments in aqueous coating compositions, such as latex paints. In addition to whiteness, TiO 2 Also provides opacity or hiding power to paints. The opacity or hiding power of such a paint or lacquer is a measure of the paint's ability to hide the surface to which it is applied. [0007] The opacifying power is a function of the spacing between opacifying pigment particles in the dried applied paint (see US 6,080,802, EP 1398333...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/02C08F2/22C08F265/06C09D151/00
CPCC08F2/22C09D5/024C09D5/027C09D5/028C08F2/001C08F2/26C08F2/44C08F265/04C09D151/003C08F220/06C08F222/02C08L33/02C08K2003/2241C08F220/14C08F220/1808C08F220/1804C08F212/08C08F220/56C09D5/022
Inventor I·威雷里奇V·博伊考B·雷克J·米哈尔J·莱斯温M·汤姆逊M·吕克尔M·R·舒伊布勒
Owner BASF SE