Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1998-05-05
2000-05-09
Szekely, Peter A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524 59, 524 69, 524 70, 524 71, C08L 9500
Patent
active
060605421
ABSTRACT:
The invention provides a process for preparing a bitumen composition comprising blowing a mixture with an oxygen-containing gas which mixture comprises a bitumen having a penetration of less than 300 dmm (as measured by ASTM D 5 at 25.degree. C.), a thermoplastic rubber which is present in an amount of less than 10% w, and a bitumen blowing catalyst which is present in an amount of more than 0.5% w and up to 3% w, both based on total mixture; and bitumen compositions obtainable by such process.
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European Search Report Aug. 20, 1998.
Gooswilligen Gerrit Van
Phillips Michael Christopher
Steernberg Koen
Haas Donald F.
Shell Oil Company
Szekely Peter A.
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