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Process for producing aqueous polymer dispersion

A technology of water-based polymers and dispersions, applied in the direction of coating, etc., can solve the problems of unsatisfactory application performance of polymer dispersions, and achieve the effects of superior performance, reduced leaching behavior, and low film-forming temperature

Pending Publication Date: 2021-03-09
BASF SE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unsatisfactory application properties of polymer dispersions in coatings

Method used

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  • Process for producing aqueous polymer dispersion
  • Process for producing aqueous polymer dispersion
  • Process for producing aqueous polymer dispersion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0316] Example 1 (E1)

[0317] 527.0 g of deionized water and 8.3 g of a 15% strength by weight aqueous solution of sodium lauryl sulfate were charged at 20 to 25° C. (room temperature) into a polymerization vessel equipped with a metering device and temperature regulation, and the mixture was stirred under a gentle nitrogen flow. The initial charge was heated to 95°C. When this temperature had been reached, 8.9 g of a 7% strength by weight aqueous solution of sodium peroxodisulfate were added and the batch was stirred for five minutes. Subsequently, 10.9 g of an aqueous sodium peroxodisulfate solution with a strength of 7% by weight were metered in parallel to feed stream 1 at a constant flow rate over the course of 40 minutes, maintaining the temperature. After the end of the two feed streams, a small sample was taken from the vessel to measure the molecular weight distribution of the polymer produced, and then the polymerization mixture was reacted at 95°C for a further 10...

Embodiment 2

[0332] Example 2 (E2)

[0333] Example 2 was prepared in the same manner as Example 1, except that in feed stream 1, 8.7 g of ethyl 2-(bromomethyl)acrylate was used instead of 11.7 g.

[0334] The obtained aqueous polymer dispersion had a solids content of 39.9% by weight. The polymer taken at the end of feed stream 1 had a number average molecular weight of 3500 Da, a weight average molecular weight of 6900 Da, and a peak maximum at 7100 Da. The number average molecular weight of the final polymer dispersion is 11600Da, the weight average molecular weight is 24600Da, and the maximum peak is at 20900Da.

Embodiment 3

[0335] Example 3 (E3)

[0336] Example 3 was prepared in the same way as Example 1 except that in feed stream 1, 124.0 g deionized water was used instead of 130.2 g and 5.8 g 2-(bromomethyl)acrylic acid was used Ethyl ester instead of 11.7g.

[0337] The obtained aqueous polymer dispersion had a solids content of 39.9% by weight. The polymer taken at the end of feed stream 1 had a number average molecular weight of 5600 Da, a weight average molecular weight of 11900 Da, and a peak maximum at 10600 Da. The number average molecular weight of the final polymer dispersion is 16200 Da, the weight average molecular weight is 29900 Da, and the maximum peak is at 27500 Da.

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Abstract

The present invention relates to a process for producing an aqueous polymer dispersion of polymerized ethylenically unsaturated monomers, where the process comprises a first polymerization step as anaqueous radical emulsion polymerization of a first monomer composition M.a and a subsequent further polymerization step as an aqueous radical emulsion polymerization of a second monomer composition M.b, where the monomers M comprise at least one monomer M0 which is selected from compounds of formula (1), wherein X is Cl, Br or OS(O)2R3, Y is H, Cl, Br, OS(O)2R4, C1-C10-alkyl, or C(=O)OR5, R1 is Hor C1-C10-alkyl, R2 is H or C1-C10-alkyl, R3 is C1-C10-alkyl, R4 is C1-C10-alkyl, R5 is C1-C20-alkyl. The invention also relates to an aqueous polymer dispersion obtainable by such a process as well as the use of such dispersions.

Description

[0001] The present invention relates to a process for the preparation of aqueous polymer dispersions of polymerized ethylenically unsaturated monomers, wherein the process comprises a first polymerisation step - aqueous free-radical emulsion polymerisation of a first monomer composition M.a, and subsequent Further polymerization step of - aqueous free-radical emulsion polymerization of the second monomer composition M.b. The invention also relates to the aqueous polymer dispersion obtainable by such a process, and to the use of such a dispersion. [0002] Background of the invention [0003] Polymer dispersions are generally known, especially as binders or binder components (also called co-binders). As binders, especially in coatings, one of the important requirements for such coatings is that they have excellent hardness and thus exhibit good scratch and block resistance. Furthermore, to minimize the amount of film former required, a low film formation temperature (ie, to fil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/22C09D151/00C08F265/06C08L51/00
CPCC08F2/22C08F265/06C08L51/003C09D151/003C08F220/1804C08J3/07C08J2351/00
Inventor M·班迪拉R·巴尔克B·罗梅杰M·J·巴兰迪亚兰
Owner BASF SE
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