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ADDITIVE FOR REDUCTION OF SWELLING IN ELASTOMERIC COMPOSITIONS CAUSED BY ATMOSPHERIC HUMIDITY OR EXPOSURE TO WATER

IP.com Disclosure Number: IPCOM000250132D
Publication Date: 2017-Jun-02

Publishing Venue

The IP.com Prior Art Database

Abstract

Elastomeric compositions residing in atmospheric conditions having at least 40 percent relative humidity have reduced tendency to swell through the addition of 2,2,4-trimethyl-1,3-pentanediol diisobutyrate additive introduced to the elastomeric composition in an amount ranging from about 10 to 20 weight percent based on the total weight of such compositions.

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This is the abbreviated version, containing approximately 11% of the total text.

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ABSTRACT

Elastomeric compositions residing in atmospheric conditions having at least 40 percent

relative humidity have reduced tendency to swell through the addition of 2,2,4-trimethyl-1,3-

pentanediol diisobutyrate additive introduced to the elastomeric composition in an amount

ranging from about 10 to 20 weight percent based on the total weight of such compositions.

ADDITIVE FOR REDUCTION OF SWELLING IN ELASTOMERIC

COMPOSITIONS CAUSED BY ATMOSPHERIC HUMIDITY OR

EXPOSURE TO WATER

BACKGROUND OF THE DISCLOSURE

Polyurethanes are formed by the reaction of an isocyanate with an isocyanate-reactive

compound, such as a polyol. Generally, streams of approximately equal volume of the

isocyanate and the polyol are mixed in a mixing-head to form a reaction mixture, and then the

reaction mixture is dispensed into a cavity or mold. In the reaction mixture, hydroxyl (OH)

functional groups of the polyol and isocyanate (NCO) functional groups of the isocyanate react

to carbamate linkages (i.e. form the polyurethane). Depending upon the viscoelastic properties

of the polyurethane, the formed structure may be considered elastomeric (i.e., an elastic

material resembling rubber, also referred to as a polyurethane elastomer) or non-elastomeric.

It is generally known that polyurethane elastomers swell when exposed to water or

atmospheric humidity, as do virtually all synthetic polymers. This phenomenon can cause

issues when the size and/or the shape of polyurethane materials is important as a final product

or an intermediary product. For example, swelling of elastomeric polyurethane skins for

automotive instrument panels during manufacture is a known problem that can make the skins

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useless because they are no longer the proper size for subsequent steps in the manufacturing

process.

The present disclosure aims to reduce, or otherwise minimize, swelling of polyurethane

elastomeric materials when exposed to water or atmospheric humidity.

In addition, the principles of the present disclosure may also be applicable for other

elastomer materials wherein swelling associated with water or atmospheric humidity is an

issue, such as for use in polyamides and epoxides.

SUMMARY OF THE DISCLOSURE

The present disclosure has surprisingly discovered that the addition of 2,2,4-trimethyl-

1,3-pentanediol diisobutyrate (shown below as Formula (I)) additive, in an amount ranging

from about 10 to 20 weight percent, significantly reduced the tendency of elastomeric

compositions, and in particular elastomeric polyurethane compositions, to swell atmospheric

conditions having at least 40 percent relative humidity.

(I)

Other features and advantages of the present disclosure will be readily appreciated, as the

same becomes better understood, after reading the subsequent description.

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DETAILED DESCRIPTION OF THE DISCLOSURE

The present disclosure is directed to methods for reducing swelling associated with

exposure to water or atmospheric humidity of elastomeric compositions, and in part...