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Polymer particle, polymer dispersion, method for producing said polymer dispersion, coating material produced from said polymer dispersion, and coated article

a technology of polymer dispersions and polymer particles, which is applied in the direction of coatings, polyurea/polyurethane coatings, etc., can solve the problems of poor weather resistance, water resistance, solvent resistance, contamination resistance, and poor appearance of coating films, and achieve excellent water resistance and solvent resistance, excellent polymerization stability, excellent viscosity characteristics and storage stability

Inactive Publication Date: 2018-04-19
MITSUBISHI CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention relates to a polymer dispersion that has good stability and viscosity when used in coating materials. It also provides a coating material that can form a film with excellent water and solvent resistance, even under low-temperature and short-time drying conditions. The polymer particles used in the dispersion have a gel fraction of 10% or more, which improves film formation and results in a coating film with good water and solvent resistance. These particles are produced by polymerizing an acrylic monomer mixture in an aqueous dispersion of urethane resin.

Problems solved by technology

However, the water-based paints have a problem that the appearance of coating film and the coating film performance such as weather resistance, water resistance, solvent resistance, and contamination resistance are poorer as compared with those of the organic solvent-based paints.

Method used

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Examples

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first embodiment

s

[0041]The first embodiment of the invention is polymer particles which contain a urethane resin (A1) and an acrylic polymer (B1) in the same particle and has a gel fraction measured using N,N-dimethylformamide (hereinafter, abbreviated as DMF) as a solvent of 10% or more.

[0042]It is possible to form a coating film exhibiting excellent water resistance and especially excellent solvent resistance even under a drying condition of a low temperature and a short time when a polymer dispersion containing the polymer particles having a gel fraction of 10% or more as a coating material.

[0043]The gel fraction is preferably 15% or more and 99.5% or less, even more preferably 15% or more and 95% or less, and even more preferably 20% or more and 90% or less. It is possible to improve the film forming property and to form a coating film exhibiting excellent water resistance and solvent resistance by setting the gel fraction to these ranges. Such polymer particles are produced by, for example, a ...

second embodiment

[0109]The second embodiment of the invention is polymer particles which contain the urethane resin (A2) having a sulfonic acid group and the acrylic polymer (B2) in the same particle and have a surface acid value measured by the potentiometric titration of from 0.1 to 19 mg KOH / g.

[0110]The surface acid value of the polymer particles in the second embodiment of the invention is required to be from 0.1 to 19 mg KOH / g. The surface acid value is preferably from 0.5 to 17.5 mg KOH / g, more preferably from 1 to 10 mg KOH / g, and even more preferably from 1 to 7 mg KOH / g. The paint viscosity characteristics are easily exerted and the storage stability is excellent when the polymer particles are formed into a coating material when the surface acid value of the polymer particles is 0.1 mg KOH / g or more. The polymerization stability and the water resistance of the coating film do not decrease and the paint viscosity characteristics and storage stability when the polymer particles are formed int...

third embodiment

cing Polymer Dispersion

[0176]Next, the method for producing a polymer dispersion according to the third embodiment of the invention will be described.

[0177]The third embodiment of the invention is a method for producing a polymer dispersion including a step (1) of obtaining a dispersion containing a polymer P obtained by polymerizing a mixture X containing a urethane resin (A3), a monomer (b5) having two or more radically polymerizable groups, and a radically polymerizable monomer (b6) other than the monomer (b5) and a step (2) of obtaining a dispersion containing a polymer Z by adding a radically polymerizable monomer mixture Y to the dispersion containing the polymer P and conducting the polymerization, and in the method, the content of the urethane resin (A3) in the mixture X at the time of starting the reaction in the step (1) is required to be from 25 to 95% by mass with respect to the total mass of the mixture X.

[0178]A mode of the method for producing a polymer dispersion of ...

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Abstract

A method for producing a polymer dispersion, by polymerizing a mixture X containing a urethane resin (A3), a monomer (b5) having two or more radically polymerizable groups, and a radically polymerizable monomer (b6) other than the monomer (b5), to obtain a dispersion containing a polymer P; and adding a pre-emulsion prepared by emulsifying and dispersing a radically polymerizable monomer mixture Y dropwise to the dispersion containing the polymer P and conducting polymerization, to obtain a dispersion containing a polymer Z, where a content of the urethane resin (A3) in the mixture X at the time of starting the reaction in the step (1) is from 25 to 95% by mass with respect to a total mass of the mixture X.

Description

TECHNICAL FIELD[0001]The present invention relates to polymer particles, a polymer dispersion, a method for producing the polymer dispersion, a coating material produced from the polymer dispersion, and a coated article.[0002]This application is based upon and claims the benefit of priority of the prior Japanese Patent Application No. 2013-026955 filed in the Japanese Patent Office on Feb. 14, 2013, the prior Japanese Patent Application No. 2013-125844 filed in the Japanese Patent Office on Jun. 14, 2013, and the prior Japanese Patent Application No. 2014-021278 filed in the Japanese Patent Office on Feb. 6, 2014, the entire contents of which are incorporated herein by reference.BACKGROUND ART[0003]Hitherto, in the field of paints, the conversion from organic solvent-based paints to water-based paints has been attempted from the viewpoint of environmental conservation and safety and health. However, the water-based paints have a problem that the appearance of coating film and the co...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08L33/08C09D133/08C08F2/26C08F2/24C08G18/08C08F2/44C09D133/06C08G18/44C08G18/42C09D175/04C08F283/04C08L75/04
CPCC09D133/08C08L2201/56C08L33/08C08F2/26C08F2/24C08F2/44C08G18/44C08G18/42C09D175/04C08F283/04C09D133/06C08G18/0828C08L75/04
Inventor KOSUGI, NAOHIROYAMATO, SHINYANAKAMURA, JUNICHITANAKA, MOTOMITORISAKI, MASASHI
Owner MITSUBISHI CHEM CORP
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