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APPLICATIONS AND BENEFITS OF CARBOXYLATED CELLULOSE ESTERS IN A RANGE OF COATINGS SYSTEMS

IP.com Disclosure Number: IPCOM000174754D
Publication Date: 2008-Sep-22
Document File: 18 page(s) / 2M

Publishing Venue

The IP.com Prior Art Database

Abstract

APPLICATIONS AND BENEFITS OF CARBOXYLATED CELLULOSE ESTERS IN A RANGE OF COATINGS SYSTEMS Carboxylated cellulose esters can be prepared using a variety of synthetic techniques, which have been outlined in a number of earlier publications. These materials find utility in a number of end uses including coatings designed for automotive, aerospace, architectural, wood, consumer electronics, industrial maintenance and coil as well as in inks, overprint varnishes, adhesives, and pigment dispersions. Depending on molecular weight, acid number, and chemical composition, carboxylated cellulose esters can be neutralized and dispersed or solubilized in water, which allows them to be used in waterborne coating formulations. Carboxylated cellulose esters provide a range of benefits including improved dry-to-touch time, flow and leveling, improved sag resistance, improved appearance, defect reduction, aluminum flake control, improved atomization, application consistency, and redissolve resistance as demonstrated by the results herein.

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APPLICATIONS AND BENEFITS OF CARBOXYLATED CELLULOSE ESTERS IN A RANGE OF COATINGS SYSTEMS

EASTMAN CHEMICAL COMPANY

ABSTRACT

Carboxylated cellulose esters can be prepared using a variety of synthetic techniques, which have been outlined in a number of earlier publications. These materials find utility in a number of end uses including coatings designed for automotive, aerospace, architectural, wood, consumer electronics, industrial maintenance and coil as well as in inks, overprint varnishes, adhesives, and pigment dispersions. Depending on molecular weight, acid number, and chemical composition, carboxylated cellulose esters can be neutralized and dispersed or solubilized in water, which allows them to be used in waterborne coating formulations. Carboxylated cellulose esters provide a range of benefits including improved dry-to-touch time, flow and leveling, improved sag resistance, improved appearance, defect reduction, aluminum flake control, improved atomization, application consistency, and redissolve resistance as demonstrated by the results herein.

BACKGROUND:

A variety of carboxylated cellulose esters are known, and may be used in coating compositions. The preparation of carboxylated cellulose esters has been described in previous patents, including US 4,590,265; US 5,668,273; US 5,792,856; US 5,973,139; and US patent application 2005/0192434 A1 as well as Industrial and Engineering Chemistry, Vol. 49, pp. 84-88, January, 1957. Cellulose acetate butyrate succinate (CAB-SU-160), was a carboxylated cellulose ester that was previously manufactured by Eastman Kodak company. Carboxymethyl cellulose acetate butyrate (CMCAB) is a commercial example of a carboxylated cellulose ester, which is manufactured by Eastman Chemical Company. Aqueous solutions of these esters can be made adding carboxylated cellulose ester to a mixture of water, an organic solvent such as ethylene glycol monobutyl ether, and a quantity of either ammonia or an amine required to fully neutralize the acid functionality. Alternatively, dispersions of CMCAB cellulose ester may be made by first preparing an organic solution in a suitable solvent followed by addition of water and a quantity of amine mixture sufficient to yield 15 - 20% neutralization of the acid functionality to the stirred solution to yield a dispersion with an approximate pH of 4-5. These procedures are described in more detail in Eastman Chemical Company Publication GN-431A (February 2003). An alternative method to prepare dispersions of carboxylated cellulose esters while minimizing volatile organic compound (VOC) content is described in US Patent No. 7,052,540.

Utility of aqueous solutions and dispersions of carboxylated cellulose esters have been described previously. US Patent No. 4,590,265 showed that carboxylated cellulose esters provided improved pigment dispersions r...