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Process for production of polymer dispersions containing an acetoacetate moiety

a technology of acetoacetate and polymer dispersions, which is applied in the field of production of polymer dispersions containing acetoacetate moiety, can solve the problems of increasing the difficulty of manufacturing and transportation of polymers

Inactive Publication Date: 2005-06-16
BASF AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Higher viscosities increase the difficulty of manufacture and transportation of the polymers.

Method used

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  • Process for production of polymer dispersions containing an acetoacetate moiety
  • Process for production of polymer dispersions containing an acetoacetate moiety
  • Process for production of polymer dispersions containing an acetoacetate moiety

Examples

Experimental program
Comparison scheme
Effect test

example 1 (

E1)

MMA / BA / AAEMA Copolymer Dispersion Prepared by Using a Base During Polymerization

[0081] The polymerization recipe and process is similar to that of CE1, except NaOH was added into the Monomer Emulsion I. The compositions of Emulsion I and II are given below. After the emulsion polymerization and the chemical stripping processes, the polymer dispersion has been cooled down to room temperature, 17.32 g of a 28% strength by weight aqueous ammonia and the same amount of the biocide as in CE1 were added. The product was essentially free of coagulum, had a pH of 9.2, solids content of 50.10% by weight and a Brookfield viscosity of 690 cps. The pH values during emulsion polymerizations were recorded. Table 1 summarizes pH values measured, final latex viscosity, and paint scrub resistance. The compositions of the monomer emulsions were as follows:

Monomer Emulsion I242.73 gwater 33.33 gemulsifier 1 15.63 gemulsifier 2 13.16 gemulsifier 3 10.00 gMAA 12.50 gIA 25.00 ga 50% strength by we...

example 2 (

E2)

MMA / BA / AAEMA Copolymer Dispersion Prepared by Using a Base during Polymerization

[0083] The polymerization recipe and process is similar to that of CE1, except NaOH was added into the Monomer Emulsion I. The compositions of Emulsion I and II are given below. After the emulsion polymerization and the chemical stripping processes, the polymer dispersion was cooled down to room temperature, 14.29 g of a 28% strength by weight aqueous ammonia and the same amount of the biocide as in CE1 were added. The product was essentially free of coagulum, had a pH of 9.29, solids content of 49.48% by weight and a Brookfield viscosity of 320 cps. The pH values during emulsion polymerizations were recorded. Table 1 summarizes pH values measured, final latex viscosity, and paint scrub resistance. The compositions of the monomer emulsions were as follows:

Monomer Emulsion I235.08 gwater 33.33 gemulsifier 1 15.63 gemulsifier 2 13.16 gemulsifier 3 10.00 gMAA 12.50 gIA 25.00 g50% strength by weight a...

example 3 (

E3)

MMA / BA / AAEMA Copolymer Dispersion Prepared by Using a Base During Polymerization

[0092] The polymerization recipe and process is similar to that of CE2, except NaOH was added into the Monomer Emulsion I. The compositions of Emulsion I and II are given below. After the emulsion polymerization and the chemical stripping processes, the polymer dispersion was cooled down to room temperature, 17.32 g of a 28% strength by weight aqueous ammonia and the same amount of the biocide as in CE2 were added. The product was essentially free of coagulum, had a pH of 9.33, solids content of 49.56% by weight, and a Brookfield viscosity of 980 cps. Some wet properties of the polymer dispersion and the scrub resistance of the semi-gloss paint based on the polymer dispersion are summarized in Table 2. The compositions of the monomer emulsions were as follows:

Monomer Emulsion I242.73 gwater 33.33 gemulsifier 1 15.63 gemulsifier 2 13.16 gemulsifier 3 10.00 gMAA 12.50 gIA 25.00 g50% strength by weig...

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Abstract

A method of making a composition comprising reacting, in a reactor, a non-halogenated acetoacetate group containing monomer, at least one additional monomer, and a base, wherein at least a portion of the base is fed to the reactor during reaction. Also, a composition comprising an aqueous polymer dispersion that is a product of a method comprising reacting a non-halogenated acetoacetate moiety containing monomer, at least one additional monomer, and a base, wherein the base is fed to the reaction during reaction, wherein the composition has a lower viscosity than a second composition, wherein the second composition is prepared from the same materials as the composition, and the second composition is made by a method wherein the base is added to the second composition after a reaction to form the second composition.

Description

BACKGROUND OF THE INVENTION [0001] Acetoacetate moieties in polymers have been used to make crosslinkable polymers. These polymers are useful in coatings. Generally, the polymers are prepared from monomer mixtures that contain a monomer with an acetoacetate moiety. After the polymer is formed, the polymer is neutralized with a base. [0002] These polymers are often associated with a high viscosity. Higher viscosities increase the difficulty of manufacture and transportation of the polymers. Lower viscosities are generally desirable for reasons of heat transfer and energy consumption during manufacturing. Also, lower viscosities allow for easier pumping and handling. Decreased viscosities also allow for increased solids contents, which is desirable in transportation in that less water has to be shipped. [0003] It would be desirable to make an acetoacetate moiety containing polymer with a lower viscosity. SUMMARY OF THE INVENTION [0004] The present invention relates to a method of maki...

Claims

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Application Information

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IPC IPC(8): C08F246/00
CPCC08F246/00
Inventor ZHAO, CHENG-LE
Owner BASF AG
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