To obtain the subject material having a low dielectric constant, excellent heat resistance, sufficient peel strength at a room temperature, not causing scattering of resin in cutting, etc., having excellent handleability by laminating an adhesion layer of a specific composition to a releasable film.
This material is obtained by laminating an adhesion layer composed of (A) a siloxane-modified polyimide, (B) a compound containing two methylallyl groups of formula I (R is methyl) and (C) a compound containing two or more maleimide groups in the ratio of 10-900 pts.wt. of the total of the components B and C based on 100 pts.wt. of the component A and 0.1-2 equivalent methylallyl of the component B based on 1 mol equivalent maleimide of the component C to one side of a releasable film or a metal foil. A siloxane- modified polyimide comprising 90-40 mol% of a unit of formula II (X is a tetrafunctional aromatic group such as 3,3',4,4'-diphenyl sulfone or the like; Ar is a bifunctional group such as a group of formula III or the like) and 10-60 mol% of a unit of formula IV (R is a 1-10C alkylene or methylene or -CH2OC6 H4- in which methylene is bonded to Si; n is 1-20) is preferable as the component A.
KOBAYASHI MASAHARU
SATO TAKESHI
ORINO DAISUKE
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