Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2011-07-26
2011-07-26
Choi, Ling-Siu (Department: 1762)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S121000
Reexamination Certificate
active
07985787
ABSTRACT:
Methods are provided for preparing a bitumen product having improved properties for use in asphalt road paving. In a preferred embodiment, polyphosphoric acid is added to heated bitumen and stirred for a period of time. After addition of the polyphosphoric acid, one or more sulfur-crosslinkable elastomers and one or more sulfur donor coupling agents is added to the heated bitumen and mixed. The polyphosphoric acid, sulfur-crosslinkable elastomers and sulfur donor coupling agents may also be added to separate quantities of bitumen, and the bitumens may be combined prior to use to obtain a final bitumen product having the desired characteristics.
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English Language Abstract of FR2732702.
Chin Hui
Choi Ling-Siu
Grondahl Eric
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