Polyamide-imide compositions and articles for electrical use prepared therefrom
AssigneeAsahi Kasei Kogyo Kabushiki Kaisha
InventorsKaoru Ohmura, Ichiro Shibasaki, Takeo Kimura
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Abstract
An article for electrical use such as insulative substrates, electrical circuit borads and electrical elements, wholly or partly consisting out of an aromatic polyamide-imide having a reduced viscosity of from about 0.3 to 1.5, which polyamide-imide may contain a granular material dispersed therein, and a composition comprising 100 parts by weight of said polyamide-imide and additional about 100 to 4,000 parts by weight of a granular material and optionally about 10 to 10,000 parts by weight of a polar organic solvent.
Claims26
An article for electrical use, comprising (a) an aromatic polyamide-imide having a reduced viscosity of from about 0.3 to 1.5 and repeating units for the formula, ##STR72## wherein Ar is a divalent residue represented by the formula, ##STR73## Ar' is a divalent residue represented by the formula, ##STR74## Ar" is a divalent residue represented by the formula, ##STR75## and Ar'" is a divalent residue represented by the formula, ##STR76## wherein R moieties may be the same or different and represent a hydrogen atom, a halogen atom or an alkyl group having 1 to 4 carbon atoms;
- X is an oxygen atom, a sulfur atom, a sulfonyl group, a carbonyl group, a carbonyloxy group, a methylene group, an ethylene group or a dimethylmethylene group;
- and (b) about 1 to 40 times the weight of (a) of at least one granular material uniformly dispersed therein selected from the group consisting of metals, metal oxides, metal nitrides, metal carbides, metal silicides, silicon, silicon oxides, silicon nitrides, silicon carbide, boron, boron nitrides and carbon.
Dependencies are inferred from the claim text.