Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1998-01-13
1999-11-02
Derrington, James
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
264645, 264670, 264344, 524413, 524430, 524439, 524440, 524503, 525 57, 419 36, 419 37, 419 65, C08J 305, C08K 308, C08K 310
Patent
active
059772301
ABSTRACT:
A powder injection molding composition or feedstock is made of 70% or more by weight of a powdered metal or ceramic and 30% or less by weight of a binder system. The binder system contains a sufficient amount of polypropylene or polyethylene to hold the so-called brown preform of the molded metal or ceramic powder together for the sintering step of the injection molding process and a sufficient amount of partially hydrolyzed cold water soluble polyvinyl alcohol, water and plasticizer to facilitate molding of the composition into the so-called green preform of the article to be manufactured. The debinding step of the injection molding process for transforming the green preform into the brown preform consists simply of immersing the green preform in water at ambient temperature to dissolve the polyvinyl alcohol. The binder system is nonhazardous, safe, harmless and fully degradable.
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Petcavich Robert J.
Yang Xiaoming
Derrington James
Planet Polymer Technologies, Inc.
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