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Polymer formulations in solvents having high flash points obtainable by radical polymerization of alkyl(meth)acrylates in the presence of ethylene-vinyl ester copolymers

IP.com Disclosure Number: IPCOM000240461D
Publication Date: 2015-Jan-30
Document File: 5 page(s) / 102K

Publishing Venue

The IP.com Prior Art Database

Abstract

Polymer formulations in solvents having high flash points were manufactured by radical polymerization of alkyl(meth)acrylates in the presence of ethylene-vinyl ester copolymers in aromatic solvents having chain transfer properties. The formulations obtained may be used as pour point depressant for crude oil or mineral oil.

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Polymer formulations in solvents having high flash points obtainable by radical polymerization of alkyl(meth)acrylates in the presence of ethylene-vinyl ester copolymers

Abstract:

Polymer formulations in solvents having high flash points were manufactured by radical polymerization of alkyl(meth)acrylates in the presence of ethylene-vinyl ester copolymers in aromatic solvents having chain transfer properties. The formulations obtained may be used as pour point depressant for crude oil or mineral oil.

Specification:

Polymer formulations comprising solvents having high flash points, including but not limited to solvents having flash points of more than 60°C can be obtained by radical polymerization of alkylacrylates or alkylmethacrylates in the presence of ethylene-vinyl ester copolymers in such solvents. These formulations may be used as pour point depressant for crude oil or mineral oil. Also two or more different solvents having high flash points may be used.

For a good performance as pour point depressant typically a specific range of molecular weights is necessary. The average molecular weights (Mw) may be selected by the skilled artisan according to the desired properties of the formulations and may typically range from 50,000 g/mol to 100,000 g/mol.

In order to obtain the desired molecular weights of the alkyl(meth)acrylate polymers chain transfer agents such as alcohols (isopropanol, allyl alcohol, buten-2-ol), thiols (ethanthiol), or aldehydes (crotonic aldehyde) can be used.

It is also known that many solvents exhibit chain transfer properties. Even though their transfer coefficients might be smaller than those of classical transfer agents, the high concentration of solvents leads to an efficient transfer effect. This effect may be used in polymerization reactions to control the molecular weight.

Specifically, we used said effect to radically polymerize alkyl(meth)acrylates in the presence of ethylene-vinyl ester copolymer in aromatic solvents, for instance alkyl substituted aromatics, in particular comprising high boiling aromatic solvent mixtures.

Examples for this process are given in the examples below.


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Examples:

Solvents used:

Solvesso® 200 ND aromatic solvent mixture, initial boiling point 237°C, final boiling point

285°C, flash point 105°C

Solvesso® 150 ND aromatic solvent mixture, initial boiling point 180°C, final boiling point

205°C, flash point 65°C

Shellsol® D70 Aliphatic solvent mixture, consisting predominantly of C11-C14

paraffins and naphthenes , initial boiling point 198°C, final boiling point 242°C, flash point 74°C

Polymerization with stearyl acrylate in Solvesso® 200 ND and ethylene-vinyl acetate 67/33

Apparatus: 2l four-necked flask, stirrer, condenser, nitrogen inlet, thermometer, oil bath 274 g of fatty alcohol C1618 ester (stearyl acrylate) and 63.8 g of ethylene-vinyl acetate copolymer (67 wt.% ethylene, 33 wt.% vinyl acetate) are molten in 202.4 g aliphatic solvent (...