Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2004-02-19
2008-03-25
Woodward, Ana (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C523S212000, C524S111000, C524S113000, C524S356000, C524S359000, C524S361000, C524S362000, C524S363000, C524S364000, C524S366000, C524S375000, C524S379000, C524S384000, C524S430000, C524S538000
Reexamination Certificate
active
07348373
ABSTRACT:
Water absorption resistant polyimide pastes (or solutions), are particularly useful to make electronic screen printable pastes and the electronic components made from these pastes. A group of soluble polyimides and their solvents were discovered to be particularly resistant to moisture absorption. These polyimide solutions optionally contain polyimides also containing cross-linkable monomers and/or thermal cross-linking agents. In addition, these polyimide pastes may optionally contain adhesion promoting agents, blocked isocyanates, metals, metal oxides, and other inorganic fillers. The polyimide pastes (or solutions) of the present invention have a polyimide with a glass transition temperature greater than 250° C., have a water absorption factor of less than 2%, and a have a positive solubility measurement.
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Dueber Thomas E.
Fang Xin
Summers John D.
E.I. du Pont de Nemours and Company
Woodward Ana
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