Asphaltic composition
AssigneeExxon Research & Engineering Co.
InventorLyle E. Moran
Life of this patent
Estimating the term…
Abstract
An asphaltic composition having improved tensile properties is disclosed. Also disclosed is a method for producing said composition which comprises: A. contacting an asphalt with a mineral acid; B. contacting the acid modified asphalt thus formed with an oxygen-containing gas; C. adding a thermoplastic elastomer to the acid/oxygen modified asphalt thus formed; and D. adding an unsaturated functional monomer to the polymer modified asphalt. In a preferred embodiment, the asphalt is contacted with an oxygen-containing gas prior to and during contact with the mineral acid.
Claims36
An asphaltic composition having improved tensile properties that is produced by the method comprising:
- (a) contacting asphalt with from about 0.25 to about 4 wt. % of a mineral acid to form an acid modified asphalt,
- (b) contacting said acid modified asphalt with an oxygen-containing gas to form an acid/oxygen modified asphalt, the temperature of the asphalt during said contacting in (a) and (b) being maintained between about 200.degree. C. and about 300.degree. C.,
- (c) contacting said acid/oxygen modified asphalt with from about 5 to about 25 wt. % of a thermoplastic elastomer at a temperature between about 160.degree. C. to form a polymer modified asphalt, and
- (d) contacting said polymer modified asphalt with from about 0.3 to about 15 wt. % of an unsaturated functional monomer selected from the group consisting of an unsaturated carboxylic acid, an unsaturated dicarboxylic acid, an unsaturated anhydride, an unsaturated ester, an unsaturated imide and mixtures thereof at a temperature above about 120.degree. C. but not more than about 200.degree. C.
A method for producing an asphaltic composition having improved tensile properties which comprises:
- (a) contacting asphalt with from about 0.25 to about 4 wt. % of a mineral acid to form an acid modified asphalt,
- (b) contacting said acid modified asphalt with an oxyqen-containing gas to form an acid/oxygen modified asphalt, the temperature of the asphalt during said contacting in (a) and (b) being maintained between about 200.degree. and about 300.degree. C.,
- (c) contacting said acid/oxygen modified asphalt with from about 5 to about 25 wt. % of a thermoplastic elastomer at a temperature between about 160.degree. and about 220.degree. C. to form a polymer modified asphalt, and
- (d) contacting said polymer modified asphalt with from about 0.3 to about 15 wt. % of an unsaturated functional monomer selected from the group consisting of an unsaturated carboxylic acid, an unsaturated dicarboxylic acid, an unsaturated anhydride, an unsaturated ester, an unsaturated imide and mixtures thereof at a temperature above about 120.degree. C. but no more than about 200.degree. C.
A method for producing an asphaltic composition having improved tensile properties which comprises:
- (a) passing air through an asphalt having an atmospheric boiling point of at least 380.degree. C., which is maintained at a temperature of about 200.degree. C. to about 280.degree. C. for a period of time ranging between about 0.5 to about 2 hours to form an air blown asphalt;
- (b) subsequently adding between about 0.25 and about 4 wt. % phosphoric acid to the air blown asphalt and passing air through said air blown asphalt for an additional period of time ranging from about 1 to about 12 hours to form an acid/air modified asphalt;
- (c) adding between about 5 to about 25 wt. % styrene-butadiene-styrene block copolymer to said acid/air modified asphalt at a temperature between about 160.degree. and about 220.degree. C. to form a polymer modified asphalt;
- and
- (d) adding between about 0.3 and about 15 wt. % of an unsaturated functional monomer selected from the group consisting of maleic acid, maleic anhydride and mixtures thereof to said polymer modified asphalt at a temperature above about 120.degree. C. but no more than about 200.degree. C.
Dependencies are inferred from the claim text.