Abstract: A polyamide acid which contains at least one diamine compound selected from among diamine compounds represented by general formula (8) within the range of 3-60 parts by mole in total per 100 parts by mole of all diamine components, while containing a biphenyl tetracarboxylic acid dianhydride within the range of 40-100 parts by mole and a pyromellitic acid dianhydride within the range of 0-60 parts by mole per 100 parts by mole of all acid anhydride components; and a thermoplastic polyimide which is obtained curing this polyamide acid. (In formula (8), linking group X represents a single bond or a divalent group selected from among —CONH—; each Y independently represents a hydrogen atom, a monovalent hydrocarbon group having 1-3 carbon atoms or an alkoxy group; n represents an integer of 0-2; and each of p and q independently represents an integer of 0-4.

Abstract: A polyamide acid which contains at least one diamine compound selected from among diamine compounds represented by general formula (8) within the range of 3-60 parts by mole in total per 100 parts by mole of all diamine components, while containing a biphenyl tetracarboxylic acid dianhydride within the range of 40-100 parts by mole and a pyromellitic acid dianhydride within the range of 0-60 parts by mole per 100 parts by mole of all acid anhydride components; and a thermoplastic polyimide which is obtained curing this polyamide acid. (In formula (8), linking group X represents a single bond or a divalent group selected from among —CONH—; each Y independently represents a hydrogen atom, a monovalent hydrocarbon group having 1-3 carbon atoms or an alkoxy group; n represents an integer of 0-2; and each of p and q independently represents an integer of 0-4.

Abstract: A laminate (20) for a suspension comprises a stainless steel foil (11), and an insulating layer (12) and a conductor layer (13) that are stacked in this order on the stainless steel foil (11). The stainless steel foil (11) contains a martensite phase in a volume fraction of 0.4 to 2.5 volume %. The insulating layer (12) is made of a polyimide resin, for example. The conductor layer (13) contains pure copper or a copper alloy, for example. The laminate (20) for a suspension is used for producing a wiring-integrated suspension that flexibly supports a slider including a magnetic head such that the slider is opposed to a recording medium.