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UNSATURATED POLYESTER RESIN COMPOSITIONS COMPRISING RESIDUES OF AROMATIC DIACID, ALIPHATIC DIOL, AND CYCLOALIPHATIC DIOL COMPOUNDS AND ARTICLES MADE THEREFROM EXHIBITING CORROSION, CHEMICAL AND HEAT RESISTANCE

IP.com Disclosure Number: IPCOM000193292D
Publication Date: 2010-Feb-17
Document File: 9 page(s) / 404K

Publishing Venue

The IP.com Prior Art Database

Related People

Eastman Chemical Company: OWNER [+4]

Abstract

Abstract Unsaturated polyester resins are described comprising residues of an aliphatic diol, a cycloaliphatic diol and an aliphatic, cycloaliphatic, or aromatic diacid, and an ethylenically unsaturated diacid or anhydride. The unsaturated polyester resins are dissolved in an ethylenically unsaturated monomer, usually styrene, which acts as solvent and reactive diluent. The unsaturated polyester/styrene solution is catalyzed and molded into composite articles such as chemical storage tanks, flue-gas scrubbers, piping, prepregs, automotive parts, electronic circuit boards, and other components requiring corrosion, chemical, and heat resistance. These components may or may not be reinforced with fiberglass, carbon fiber, or some other reinforcement commonly used in composite applications. Incorporating high Tg monomers is a challenge from a styrene solubility standpoint. Monomers known to increase resin Tg may have a negative effect on styrene solubility or solution viscosity. Resins produced using 2,2,4,4-tetramethyl-1,3-cyclobutanediol have good styrene solubility. Unsaturated polyester resins prepared with increasing levels of high Tg monomers generally have higher heat deflection temperatures when cured. This generally translates to better corrosion, chemical, and heat resistance, thus greater polymer stability upon exposure. Another aspect affecting polymer stability, and subsequently the physical properties of composite part upon exposure is the degree of steric hindrance around the ester linkage within the polyester backbone. Monomers with greater steric hindrance can provide additional polymer stability when exposed to aggressive chemical environments. Unsaturated polyester resins containing 2,2,4,4-tetramethyl-1,3-cyclobutanediol exhibit greater steric hindrance thus have better polymer stability upon exposure. The unsaturated polyester solution described is useful for preparing manufactured composite articles such as chemical storage tanks, flue-gas scrubbers, piping, prepregs, automotive parts, electronic circuit boards, infrastructure components and other components requiring corrosion, chemical, and heat resistance.

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UNSATURATED POLYESTER RESIN COMPOSITIONS COMPRISING RESIDUES OF AROMATIC

DIACID, ALIPHATIC DIOL, AND CYCLOALIPHATIC DIOL COMPOUNDS AND ARTICLES MADE

THEREFROM EXHIBITING CORROSION, CHEMICAL AND HEAT RESISTANCE

Abstract

Unsaturated polyester resins are described comprising residues of an aliphatic diol, a cycloaliphatic diol

and an aliphatic, cycloaliphatic, or aromatic diacid, and an ethylenically unsaturated diacid or anhydride.

The unsaturated polyester resins are dissolved in an ethylenically unsaturated monomer, usually styrene,

which acts as solvent and reactive diluent. The unsaturated polyester/styrene solution is catalyzed and

molded into composite articles such as chemical storage tanks, flue-gas scrubbers, piping, prepregs,

automotive parts, electronic circuit boards, and other components requiring corrosion, chemical, and heat

resistance. These components may or may not be reinforced with fiberglass, carbon fiber, or some other

reinforcement commonly used in composite applications.
Incorporating high Tg monomers is a challenge from a styrene solubility standpoint. Monomers

known to increase resin Tg may have a negative effect on styrene solubility or solution viscosity. Resins

produced using 2,2,4,4-tetramethyl-1,3-cyclobutanediol have good styrene solubility.
Unsaturated polyester resins prepared with increasing levels of high Tg monomers generally

have higher heat deflection temperatures when cured. This generally translates to better corrosion,

chemical, and heat resistance, thus greater polymer stability upon exposure. Another aspect affecting

polymer stability, and subsequently the physical properties of composite part upon exposure is the degree

of steric hindrance around the ester linkage within the polyester backbone. Monomers with greater steric

hindrance can provide additional polymer stability when exposed to aggressive chemical environments.

Unsaturated polyester resins containing 2,2,4,4-tetramethyl-1,3-cyclobutanediol exhibit greater steric

hindrance thus have better polymer stability upon exposure.
The unsaturated polyester solution described is useful for preparing manufactured composite

articles such as chemical storage tanks, flue-gas scrubbers, piping, prepregs, automotive parts, electronic

circuit boards, infrastructure components and other components requiring corrosion, chemical, and heat

resistance. Introduction

Unsaturated polyester resins are used to make composite structures for service in harsh

environments. These harsh environments can be detrimental to other materials of construction such as

wood, steel, iron, aluminum, etc. The composite structures made from unsaturated polyester resins

exhibit acceptable corrosion, chemical, and heat resistance in many of these applications. One commonly

used unsaturated polyester resin for this application is based on propylene glycol, the aromatic diacids

isophthalic acid or terephthalic acid, and maleic anhydride or fumaric acid. The unsaturated polyest...