Process for producing hydrocarbon resins having improved color and thermal stability
AssigneeMitsui Petrochemical Industries, Ltd.
InventorsShigeru Katayama, Mutsuhiro Aoki
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Abstract
A process for producing a hydrocarbon resin having improved color and thermal stability, which comprises treating a petroleum cracking or reforming fraction containing cationically polymerizable hydrocarbons and not more than 0.7% by weight, based on the fraction, of cyclopentadienes and having a boiling range of from 140.degree. C. to 280.degree. C., with 0.8 to 3.0 moles, per mole of the cyclopentadienes, of a dienophile compound having a carbon-to-carbon double bond and a carbonyl or cyano group adjacent to the double bond; and then polymerizing the treated petroleum fraction in the presence of a polymerization catalyst.
Claims23
A process for producing a hydrocarbon resin having improved color and thermal stability, which comprises contacting a petroleum cracking or reforming fraction containing at least 20% by weight of cationically polymerizable hydrocarbons and not more than 0.7% by weight, based on the fraction, of cyclopentadienes and having a boiling range of from 140.degree. C. to 280.degree. C., with 0.8 to 3.0 moles, per mole of the cyclopentadienes, of a dienophile compound having a carbon-to-carbon double bond and a carbonyl or cyano group adjacent to the double bond;
- and then polymerizing the treated petroleum fraction in the presence of a polymerization catalyst.
A process for producing a hydrocarbon resin having improved color and thermal stability which comprises contacting a petroleum cracking or reforming fraction containing 30 to 75% by weight of cationically polymerizable hydrocarbons and from 0.01 to 0.5% by weight, based on the fraction, of cyclopentadienes and having a boiling range of from 140.degree. C. to 240.degree. C., with 0.8 to 3.0 moles, per mole of the cyclopentadienes, of a dienophile compound having a carbon-to-carbon double bond and a carbonyl or cyano group adjacent to the double bond and selected from the group consisting of .alpha.,.beta.-unsaturated carboxylic acids and anhydrides, esters, amides and imides thereof, .alpha.,.beta.-unsaturated nitriles, .alpha.,.beta.-unsaturated aldehydes and quinones, at a temperature of from 10.degree. C. to 100.degree. C. for at least 30 seconds;
- and then polymerizing the treated petroleum fraction at a temperature of from -30.degree. C. to +80.degree. C. in the presence of a Friedel-Crafts catalyst.
A process for producing a hydrocarbon resin having improved color and thermal stability from a petroleum cracking or reforming fraction containing at least 20% by weight of cationically polymerizable hydrocarbons and at least about 1% by weight, based on the fraction, of the cyclopentadienes, and having a boiling range of from 140.degree. C. to 280.degree. C., which comprises reducing the content of the cyclopentadienes in the petroleum fraction to from 0.1 to 0.5% by weight, based on the fraction, treating the fraction of reduced cyclopentadienes content with from 2 to 2.5 moles, per mole of the cyclopentadienes, of a dienophile compound having a carbon-to-carbon double bond and a carbonyl or cyano group adjacent to the double bond;
- and selected from the group consisting of .alpha.,.beta.-unsaturated carboxylic acids and anhydrides, esters, amides and imides thereof, .alpha.,.beta.-unsaturated nitriles, .alpha.,.beta.-unsaturated aldehydes and quinones, at a temperature of from room temperature to less than 50.degree. C., for from 1 minute to 1 hour;
- and then polymerizing the treated petroleum fraction at a temperature of from -10.degree. C. to 50.degree. C. in the presence of a Friedel-Crafts catalyst.
Dependencies are inferred from the claim text.