Bitumen/rubber compositions crosslinked with...

Details Bitumen/rubber compositions crosslinked with... Bitumen/rubber compositions crosslinked with...

2009-02-06

2009-10-27

Szekely, Peter (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C524S069000, C524S070000, C524S071000

Reexamination Certificate

active

07608650

ABSTRACT:
Asphalt and elastomeric polymer compositions crosslinked with mixed polythiomorpholines or at least one alkyl polysulfide can give polymer modified asphalts (PMAs) with improved properties and/or reduced H2S evolution. When at least one alkyl polysulfide is used to completely or partially replace conventional crosslinkers such as S or MBT, mercaptobenzimidazole (MBI) may be optionally used as a co-crosslinker. The use of mixed polythiomorpholines as crosslinkers provide PMAs with better low temperature profiles (BBR m-values). The use of at least one alkyl polysulfide crosslinker gives PMAs with improved PAV-aged DSR results, and reduced H2S evolution. The use of at least one alkyl polysulfide crosslinker together with MBI may give PMAs with improved PAV DSR Fail Temperatures.

REFERENCES:
patent: 5698651 (1997-12-01), Kawasaki et al.
patent: 2005/0145137 (2005-07-01), Buras et al.

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