Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2005-10-12
2010-06-29
Sellers, Robert (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C523S445000, C523S456000, C523S457000, C523S458000, C523S466000, C523S468000, C525S423000, C428S416000
Reexamination Certificate
active
07745516
ABSTRACT:
Water absorption resistant polyimide/epoxy-based compositions, like pastes (or solutions), are particularly useful to make electronic screen-printable materials and electronic components. A group of hydrophobic epoxies (and soluble polyimides) was discovered to be particularly resistant to moisture absorption. The polyimide/epoxy pastes made with these epoxies (and these polyimides) may optionally contain thermal crosslinking agents, adhesion promoting agents, blocked isocyanates, and other inorganic fillers. The polyimide/epoxy pastes of the present invention can have a glass transition temperature greater than 250° C., a water absorption factor of less than 2%, and a positive solubility measurement.
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Auman Brian C.
Dueber Thomas Eugene
Rogado Nyrissa S.
Subramanian Munirpallam Appadorai
Summers John D.
E. I. du Pont de Nemours and Company
Sellers Robert
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