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Abstract
Polymer modified bituminous roofing felts have proved to be successful for more than 20 years in the roofing market. This market is dominated by two types of products; APP and SBS. The intrinsic differences in physical and chemical nature between APP and SBS are reflected in the properties of bitumens modified with these respective polymers, i.e., a primarily plastic behavior for APP modified comounds and an elastic behavior for SBS modified compounds. APP modified bitumens are known for their relatively high softening points and are therefore often recommended to be used in felts for warmer climates. SBS modified bitumen have an optimal balanced set of properties providing low temperature flexibility and a sufficiently high flow resistance in combination with a high elastic recovery for fatigue resistance and durability. This enables the use of these materials in areas with a wide variety of climatic conditions. This paper reports on the development of a special SBS polymer that provides in bituminous formulations softeneing points around 150C with an acceptably low viscosity at high temperatures. Herewith, the existing range of SBS polymers has been extended towards the possiblity to produce bituminous blends with a better high-temperature resistance in combination with improved aging characterisitcs, while maintaining excellent elastic properties, e.g., for use in roofing and bridge deck application.
Polymer modified bituminous roofing felts have proved to be successful for more than 20 years in the roofing market. This market is dominated by two types of products; APP and SBS. The intrinsic differences in physical and chemical nature between APP and SBS are reflected in the properties of bitumens modified with these respective polymers, i.e., a primarily plastic behavior for APP modified comounds and an elastic behavior for SBS modified compounds. APP modified bitumens are known for their relatively high softening points and are therefore often recommended to be used in felts for warmer climates. SBS modified bitumen have an optimal balanced set of properties providing low temperature flexibility and a sufficiently high flow resistance in combination with a high elastic recovery for fatigue resistance and durability. This enables the use of these materials in areas with a wide variety of climatic conditions. This paper reports on the development of a special SBS polymer that provides in bituminous formulations softeneing points around 150C with an acceptably low viscosity at high temperatures. Herewith, the existing range of SBS polymers has been extended towards the possiblity to produce bituminous blends with a better high-temperature resistance in combination with improved aging characterisitcs, while maintaining excellent elastic properties, e.g., for use in roofing and bridge deck application.
Date
6/1998
6/1998
Author(s)
G Heimerikx; T Dekoning
G Heimerikx; T Dekoning
Page(s)
347-359
347-359
Keyword(s)
roofing; bridge deck; SBS modified bitumen; APP; high vinyl; IPD polymer
roofing; bridge deck; SBS modified bitumen; APP; high vinyl; IPD polymer