Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2007-05-25
2010-06-15
Cheung, William K (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C526S319000, C526S317100, C526S346000, C526S266000
Reexamination Certificate
active
07737217
ABSTRACT:
The present invention relates to a method of making a ready-to-press agglomerated powder mixture by wet milling a powder mixture containing binder and spray drying said slurry to an agglomerated powder useful for making cutting tools for metal machining, tools for rock drilling and wear parts. If the binder is a baroplastic polymer having a pressure induced transformation from hard to soft well developed agglomerates with good flow properties and good plasticity are obtained. The hard property of the binder is used at normal pressures, during handling of the spray-dried powder and in the green body, whereas the softer properties are used at higher pressures during the pressing of the material when the pressure exceeds from about 10 to about 50 MPa.
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Jutterström Ulf
Kauppi Annika
Cheung William K
Drinker Biddle & Reath LLP
Sandvik Intellectual Property AB
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