3m Innovative Properties Company

Hiroshi Ayukawa

Mitsuaki Kobayashi

Bert T Chien

Toshihiro Suwa

Stephen A Ezzell

Kazuhiko Minami

To provide a coating composition of a soluble aromatic polyimide having good heat resistance and mechanical strength. As a soluble polyimide, a compound of the formula (I) in which R's represent independently from one another H, halogen, an alkyl group or an alkoxy group, or a substituted or unsubstituted phenyl group; A is a tetravalent aromatic group or a group of the formula (II) in which B is a covalent bond, a &#x3e;C(R)group, a carbonyl group, O, S, a &#x3e;SO, group, a &#x3e;Si(CH)group, a &#x3e;Si(CH)group, a &#x3e;NRgroup or a bifunctional ether group in which Ris a hydrogen atom or &#x2014;C(R), Ris H, an alkyl group or an aryl group, and Ris H, F or Cl; Ar is an aromatic nucleus or a group of the formula (III) in which Ar and B are the same as defined above, and each p is an integer of 0 to 10; m is an integer of 1 to 10 is used. The polyimide has a weight average molecular weight of 150,000 to 1,000,000.

Polyimide-containing coating composition and film formed from the same

To provide an insulating material that has low dielectric constant and low dielectric loss tangent, and is superior in its processability into thin film. An insulating material for use in high-frequency electronic parts comprising: a matrix component composed at polyimide, and fluorocarbon resin particles uniformly dispersed therein.

Insulation material for use in high-frequency electronic parts

A thermally cured polyimide is provided, and in particular a crosslinked polyimide, comprising a fluorenyl diamine and comprising an aromatic ring having at least one C1-C10 branched or unbranched alkyl substituent, where the alkyl substituent includes a benzylic hydrogen. The present invention provides a crosslinked polyimide made by a process comprising the step of crosslinking a polyimide comprising diamines comprising pendent fluorenyl groups and comprising aromatic rings having at least one C1-C10 branched or unbranched alkyl substituent, the alkyl substituent including a benzylic hydrogen, by raising the temperature of said polyimide above its glass transition temperature.

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Sagamihara, Japan

Hiroshi Ayukawa