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GELLED COMPOSITIONS FOR SOLVENT-BASED COATINGS

IP.com Disclosure Number: IPCOM000013108D
Publication Date: 2003-Jun-13

Publishing Venue

The IP.com Prior Art Database

Related People

Richard O'Brian: AUTHOR

Abstract

Gelled compositions for solvent-based coatings, which could be utilized in alkyd paints, lacquers, automotive, industrial, architectural, maintenance, wood, marine, aerosol, specialty, resistant or high performance applications, are disclosed. The gellant, which is preferably a modified polyamide, provides the desired rheological and thixotropic properties and compatibility with components in the formulation. The disclosed gellants are readily incorporated into the solvent-based formulations by mild heating and/or shear mixing to form, when cooled, provide homogeneous, shear thinnable gels to firm gels. The desired rheological properties can be tailored by the gellant loading in the formulation.

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TECHNICAL DISCLOSURE

GELLED COMPOSITIONS FOR SOLVENT-BASED COATINGS

A.                 ABSTRACT

Gelled compositions for solvent-based coatings, which could be utilized in alkyd paints, lacquers, automotive, industrial, architectural, maintenance, wood, marine, aerosol, specialty, resistant or high performance applications, are disclosed. The gellant, which is preferably a modified polyamide, provides the desired rheological and thixotropic properties and compatibility with components in the formulation.� The disclosed gellants are readily incorporated into the solvent-based formulations by mild heating and/or shear mixing to form, when cooled, provide homogeneous, shear thinnable gels to firm gels.� The desired rheological properties can be tailored by the gellant loading in the formulation.

B.                 BACKGROUND OF COATINGS

Many of today’s coatings involve different types of chemistries, including alkyd and modified alkyd, epoxies, nitrocellulose lacquers, or UV cure, to name a few.� These chemistries for durable films or coatings use air-dry curing, oven curing or UV/E-beam radiation.� The coatings can be applied to a variety of substrates, including wood, concrete, metal and plastic.

Most coatings contain volatile liquids or solvents that readily evaporate during application and film formation.� The volatile components are desirable because they reduce viscosity for application and control viscosity changes during application and film formation.� A variety of organic substrates or mixtures are employed as liquids or solvents in coatings.� They can be classified as: 1) weak hydrogen-bonding solvents, which would include aliphatic (e.g., mineral spirits) and aromatic hydrocarbons (e.g., toluene and xylene); 2) hydrogen-bond acceptors, which include ester and ketones; and 3) hydrogen-bond donor-acceptor solvents such as alcohols.�

Aliphatic hydrocarbons or paraffins such as mineral spirits or naphtha are typically used in conjunction with asphalt, oil and vinyl based coatings.� Aromatic hydrocarbons such as toluene, xylene or some of the higher boiling homologs, are typically utilized with polyesters, acrylics, vinyls, lacquers, chlorinated rubbers, coal tars, certain alkyds and epoxies either alone or in combination with other solvents.� Ketones such as acetone, methyl ethyl ketone and amyl ketone are effectively used with lacquers, alkyds, polyurethanes, polyesters, vinyls, some epoxies and other resin formulations.� Esters such as ethyl, n-propyl, n-butyl or amyl acetates are commonly used as solvents with epoxy and polyurethane systems. � Alcohols such as methyl, propyl, isopropyl or butyl alcohols and cyclohexanol are good solvents for highly polar systems such as phenolics.� Glycol ethers such as the DOWANOLÒ class of solvents have found extensive use in architectural coatings due to their low surface tension and the ability to control the rate of evaporation of the solvent in the desired coating.� Dibasic esters are high boiling, oxygenated solvents that a...