Laminar polymeric sheet
First Claim
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1. A laminar sheet comprising a layer of polyimide material laminated in direct contact with a layer of amorphous polyamide material.
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Abstract
A sheet laminate of polyimide and amorphous polyamide especially suitable for making anisotropically electrically conductive articles by laser abiation drilling followed by metal plating. Preferred polyimides include those derived from polymerization of 4,4'"'"'biphenyldianhydride and 4,4'"'"'-diaminobiphenylether or p-phenylenediamine. Preferred amorphous polyamides include those derived from condensation of terephthalic acid with isomers of trimethylhexamethylenediamine.
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Citations
24 Claims
- 1. A laminar sheet comprising a layer of polyimide material laminated in direct contact with a layer of amorphous polyamide material.
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21. An anisotropically electrically conductive article comprising porous electrically insulating polyimide sheet material at least a selected portion of which has at least 25 substantially non-interconnected pores per square millimeter of its surface, at least a significant proportion of which pores individually contain electrically conductive material which provides an electrically conductive path between, and projects beyond at least one of, the main surfaces of the sheet material, each such conductive path being electrically separate from substantially all the other such conductive paths, and the polyimide being derived from polymerisation of 4,4'"'"'-biphenyl dianhydride and (4,4'"'"'-diaminobiphenyl, or 4,4'"'"'-diaminobiphenylether, or phenylenediamine) and/or being capable of retaining at least 50%, preferably at least 75%, more preferably at least 85% of its original elongation after immersion in water of pH10 at 100°
- C. for 4 days according to ASTM D882.
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22. An anisotropically electrically conductive article comprising porous electrically insulating polyimide sheet material at least a selected portion of which has at least 25 substantially non-interconnected pores per square millimeter of its surface, at least a significant proportion of which pores are internally plated with electrically conductive material, and the electrically conductive material provides an electrically conductive path between the main surfaces of the sheet material and each such path is electrically separate from substantially all the other such paths, and the polyimide being derived from polymerisation of 4,4'"'"'-biphenyl dianhydride and (4,4'"'"'-diaminobiphenyl, or 4,4'"'"'-diaminobiphenylether, or phenylenediamine) and/or being capable of retaining at least 50%, preferably at least 75%, more preferably at least 85% of its original elongation after immersion in water of pH10 to 100°
- C. for 4 days according to ASTM D882.
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23. An anisotropically electrically conductive article comprising porous electrically insulating polyimide sheet material at least a selected portion of which has a plurality of substantially non-interconnected pores at least a significant proportion of which pores individually contain a tubular first portion of electrically conductive material, which tubular material projects beyond at least one of the main surfaces of the sheet material, and the polyimide being derived from polymerisation of 4,4'"'"'-biphenyl dianhydride and (4,4'"'"'-diaminobiphenyl, or 4,4'"'"'-diaminobiphenylether, or phenylenediamine) and/or being capable of retaining at least 50%, preferably at least 75%, more preferably at least 85% of its original elongation after immersion in water of pH10 at 100°
- C. for 4 days according to ASTM D882.
Specification