Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for delivering aluminum into waterborne tint base or paint and refinish mixer system

a technology of waterborne tint and mixer system, applied in the direction of coatings, etc., can solve the problems of degrading the appearance of metal pigments, affecting the performance of aluminum flake pigments, and affecting the performance of metal flake pigments in aqueous coating compositions, so as to improve the flexibility of polyvinyl alcohol films and improve solubility.

Inactive Publication Date: 2017-03-09
BASF CORP
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent is about a method for making aqueous automotive refinish metallic paints that have a longer shelf-life and are easier to handle and measure. The method involves using pellets or pre-measured portions of metal flake pigment sealed in a film of a water-soluble polymer to protect the pigment from water. The pigmented bases also contain one or more pigments, which can be inorganic or organic, and are dispersed by milling with a dispersing resin, polymer, or dispersant. The pigments are important for pigment stability and color development. The patent aims to improve the storage and handling of metal flake pigment in the mixer system and to enhance the stability and color development of the final paint product.

Problems solved by technology

Metal flake pigments, especially aluminum flake pigments, are commonly used in making metallic basecoat coating compositions, but the long-term instability of aluminum flake pigments and other metal flake pigments in aqueous coating compositions has been a persistent problem.
The metal pigment's appearance is degraded by attack of water over time, which produces a hydrated oxide layer on the flake that discolors the flake and diminishes its metallic effect.
Accumulation over time of the hydrogen evolved from the oxidation reaction is a further problem.
However, refinish bases may need to have a much longer shelf-life than its OEM counterpart.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0021]In a first embodiment, the metal flake pigment, which in various preferred embodiments is an aluminum flake pigment or coated aluminum flake pigment (e.g., a colored aluminum or optically variable pigment containing aluminum flake), is mixed with a powdered, water-soluble polymer, which in various preferred embodiments is or includes polyvinylpyrrolidone powder, and is then compressed into pellets that can be easily stored and used in making automotive refinish paint. The metal flake pigment should already be treated as just described to resist degradation by water once dispersed in the aqueous refinish paint.

[0022]Suitable powdered water-soluble polymers include water-soluble polymers that are used as pharmaceutical excipients (binders) in preparing medicine tablets and pills such as hydroxypropylcellulose, hydroxyethylcellulose, sodium carboxymethyl cellulose, hydroxypropyl methylcellulose, polyvinylpyrrolidone, pectin, carrageenan and guar gum. One preferred powdered, water...

second embodiment

[0029]In a second embodiment, the discrete portions are pre-measured portions of metal flake pigment sealed in a film of a water-soluble polymer. The metal flake pigment is the same as already described and in various embodiments is preferably an aluminum pigment. The film may be formed from one or more water-soluble polymers such as polyvinyl alcohol, cellulose ethers, polyethylene oxide, starch, polyvinylpyrrolidone, polyacrylamide, polyvinyl methyl ether-maleic anhydride, polymaleic anhydride, styrene maleic anhydride, hydroxyethylcellulose, methylcellulose, polyethylene glycols, carboxymethylcellulose, polyacrylic acid salts, alginates, acrylamide copolymers, guar gum, casein, ethylene-maleic anhydride resin series, polyethyleneimine, ethyl hydroxyethylcellulose, ethyl methylcellulose, hydroxyethyl methylcellulose. In various embodiments, films containing water-soluble polyvinyl alcohol are preferred.

[0030]The water-soluble polymer film should have properties, such as strength a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

An automotive refinish coating mixer system includes (a) one or both of (i) at least one pellet of a compressed mixture of metal pigment and a powdered, water-soluble polymer and (ii) at least one pre-measured portion of metal flake pigment sealed in water-soluble polymer film; (b) a plurality of aqueous pigmented and unpigmented bases; and (c) a reducer base.

Description

FIELD OF THE INVENTION[0001]The present invention concerns compositions for waterborne metallic-flake paints, metallic flake preparations for making these, mixer systems for preparing aqueous automotive coatings, processes of making the paints. In particular, the invention concerns refinish paints and processes, which are room temperature or low cure temperature coatings.BACKGROUND[0002]This section provides information helpful in understanding the invention but that is not necessarily prior art.[0003]Aqueous (waterborne) coating compositions have been adopted for producing original finish (OEM) automotive basecoat compositions for many reasons, including lower volatile organic content and better appearance for metallic and pearlescent colors, which are produced using flake pigments. Metal flake pigments, especially aluminum flake pigments, are commonly used in making metallic basecoat coating compositions, but the long-term instability of aluminum flake pigments and other metal fla...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): C09D7/12C09D129/04C09D7/14C09D139/06C09D7/61C09D7/80
CPCC09D7/1216C09D139/06C08K3/08C09D7/14C08K2003/0812C09D129/04C08K7/00C08K9/02C09D7/80C09D7/61C08K3/22C08K2003/2227
Inventor SERDIUK, PAUL
Owner BASF CORP