Polyimide composite film
AssigneeUbe Industries, Ltd.
InventorsHiroaki Yamaguchi, Fumio Aoki, Shuichi Hirano
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Abstract
A polyimide composite film favorably employable for preparing a heat-resistant metal foil/polyimide film composite is composed of a polyimide substrate showing a thermal expansion coefficient of 1×10−5 to 2×10−5 cm/° C. in a temperature range of 50 to 200° C. and a polyimide film which is bonded to the substrate and which is made of polyimide composed of 30-100 molar % of the recurring unit (A) and 70-0 molar % of the recurring unit (B): [each of R and R′ is a tetravalent aromatic or aliphatic group].
Claims7
A polyimide composite film which comprises a polyimide substrate showing a thermal expansion coefficient of 1×10−5 to 2×10−5 cm/cm/° C. in a temperature range of 50 to 200° C. and a polyimide film which is bonded to the polyimide substrate and which comprises a polyimide consisting essentially of 30 to 100 molar % of the following recurring unit (A) and 70 to 0 molar % of the following recurring unit (B):
- in which R represents a tetravalent aromatic or aliphatic group and R′ represents a divalent aromatic or aliphatic group wherein the polyimide film is bonded to the polyimide substrate at a bonding strength of higher than 1.3 kg/cm in terms of 90° peel strength.
A metal foil/polyimide film composite which comprises a polyimide substrate showing a thermal expansion coefficient of 1×10−5 to 2×10−5 cm/cm/° C. in a temperature range of 50 to 200° C. and a polyimide film which is bonded to the polyimide substrate and which comprises a polyimide consisting essentially of 30 to 100 molar % of the following recurring unit (A) and 70 to 0 molar % of the following recurring unit (B):
- in which R represents a tetravalent aromatic or aliphatic group and R′ represents a divalent aromatic or aliphatic group, and a metal foil bonded to the polyimide film wherein the polyimide film is bonded to the polyimide substrate at a bonding strength of higher than 1.3 kg/cm in terms of 90° peel strength.
Dependencies are inferred from the claim text.