Bituminous compositions modified with polyolefinic materials
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United States of America Patent
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Sep 4, 2001
Issued Date -
N/A
app pub date -
Jul 24, 1997
filing date -
Dec 28, 1992
priority date (Note) -
Expired
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Abstract
The present invention relates to bituminous compositions, particularly suitable for paving and building waterproofing, comprising a bitumen and a copolymer of ethylene with propylene and/or other alpha-olefins and optionally with smaller proportion of a diene or polyene. The copolymer is besides characterized by a very low crystallinity, intrinsic viscosity higher than 1.5 dl/g and by a content of propylene units or of the alpha-olefin in form of triads comprised between 4 and 50% of the propylene or of the alpha-olefin, with at least 70% of said triads having isotactic structure.
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