| 摘要 |
<p>A silicon polyimide precursor composition comprises: 0.5 to 40% by weight of a silicon polyimide precursor having a logarithmic viscosity number (as herein defined) of 0.05 to 5 dl/g as measured at a concentration of 0.5 g/dl at 30+/-0.01 DEG C in a solvent, and having the formula: <CHEM> (in which G is a hydrogen (except when n is 0) as a group <CHEM> (in which R<1> is a tetravalent carbocyclic aromatic group, R<2> is a carbocyclic aromatic group, R<3> is a phenylene group, R<4> is a methyl or phenyl group, R<7> is a hydrogen atom or a C1-C6 alkyl group, X is an alkoxy, acetoxy or hydroxyl group, n is 0 or greater, and k is from 2.5 to 3); 0.5 to 40% by weight of a condensate having a logarithmic viscosity number of 0.01 to 0.5 dl/g, of a silicon compound of the formula: S i R4_4-m Xm (II) (in which R<4> and X have the meanings defined above and m is from 3.5 to 4); and from 50 to 99%, by weight of a solvent. In a modification, the compound of formula (I) has been imidized, e.g. by heating.</p> |
