Modified asphalt prepn. having improved penetration resistance

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-branche...

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Bibliographic Details
Main Authors JEAN MARIE MULLER, KAMAL BOUSSAD
Format Patent
LanguageEnglish
Italian
Published 29.10.1991
Edition5
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
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Summary: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.
Bibliography:Application Number: IT19890019443