Modified asphalt prepn. having improved penetration resistance

• Main Authors: MULLER JEAN MARIE, BOUSSAD KAMAL
• Format: Patent
• Language: English; Spanish
• Published: 01.12.1989
• Edition: 4
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

A process for modifying asphalt comprises mixing with asphalt, either as such or in aq. bituminous emulsion, 2.5-7.5 wt.% of a medium viscosity ethylene vinyl acetate (VA) polymer (I) having a melt index of 700-10,000 and contg. 5-40 wt.% pref. 11-40 wt.% of vinyl acetate. (I) has 0-10 alkyl-branches/1,000 backbone C atoms. The asphalt has a ring and ball softening point of more than 70 deg.C. - (I) pref. contains 11-20 wt.% of vinyl acetate and is prepd. using a non-incorporating modifier. (I) has a density of more than 0.935 g/ml; a tensile strength at break of more than 5 MPa; a 1% secant modulus of more than 90 MPa; and/or Shore A hardness of more than 90. A process for modifying asphalt comprises mixing with asphalt, either as such or in aq. bituminous emulsion, 2.5-7.5 wt.% of a medium viscosity ethylene vinyl acetate (VA) polymer (I) having a melt index of 700-10,000 and contg. 5-40 wt.% pref. 11-40 wt.% of vinyl acetate. (I) has 0-10 alkyl-branches/1,000 backbone C atoms. The asphalt has a ring and ball softening point of more than 70 deg.C. - (I) pref. contains 11-20 wt.% of vinyl acetate and is prepd. using a non-incorporating modifier. (I) has a density of more than 0.935 g/ml a tensile strength at break of more than 5 MPa a 1% secant modulus of more than 90 MPa and/or Shore A hardness of more than 90. (Machine-translation by Google Translate, not legally binding) PROCEDIMIENTO PARA MODIFICAR ASFALTO, QUE IMPLICA MEZCLAR CON ASFALTO UN POLIMERO DE VISCOSIDAD MEDIA QUE TIENE UN INDICE DE FUSION DE 700 A 10.000 Y DE 5 A 40% EN PESO DE ACETATO DE VINILO. EL POLIMERO PUEDE MEZCLARSE TAL CUAL O EN FORMA DE UNA EMULSION BITUMINOSA ACUOSA. EL POLIMERO TIENE DE 0 A 10 RAMIFICACIONES DE ALQUILO POR 1.000 ATOMOS DE CARBONO EN LA CADENA PRINCIPAL.