Novel dinaphthylene diamine monomers are used to produce poly-o-hydroxyamides which can be cyclized to low dielectric constant polybenzoxazoles useful in electronics

Specified dinaphthylene diamines are new. Dinaphthylene diamines of formulae (IVa) and (IVb) are new. Independent claims are also included for (1) poly-o-hydroxyamides of formula (I); (2) polybenzoxazoles of formula (III); (3) preparation of the poly-o-hydroxyamides; and (4) preparation of the polybenzoxazoles. E1 and E2 = H, OH or optionally unsaturated hydrocarbyl optionally containing heteroatoms; Y1 and Y2 = hydrocarbylene optionally containing heteroatoms; Z1 = a dinaphthylene group of formula (IIa) or (IIb); Z2 = four-valent hydrocarbon of linked alkyl and/or aryl groups and optionally containing heteroatoms; R1 - R4 = -C6H5, -(CH2)n-CH3, -G-(CH2)n-CH3, -CH((CH2)nCH3)2, -CH(CH3)2, -G-CH(CH3)2, -C(CH3)3, -G-C(CH3)3, -(CF2)n-CF3, -G-(CF2)n-CF3, -CF((CF2)nCF3)2, -CF(CF3)2, -C(CF3)3, -N(CH3)2 or -N(CF3)2; R5 = H, -CO(CH2)n-CH3, -COO-(CH2)n-CH3, -(CH2)n-CH3, -CH((CH2)nCH3)2, -CH(CH3)2, -O(CH3)3, -(CF2)n-CF3, -OF((CF2)nCF3)2, -CF(CF3)2, -C(CF3)3, -(CH2)n-C6H5 or -COO-(CH2)n-C6H5; G = O or S; a = 0 or 1; b = 1-200; c = 0-200; d = 0 or 1; and n = 1-5. GR5 and asterisk are ortho to each other. Die Erfindung betrifft neuartige Poly-o-hydroxamide, welche Binaphthylreste als Wiederholungseinheiten umfassen. Die Poly-o-hydroxamide können durch Erhitzen zum Polybenzoxazol cyclisiert werden. Dabei tritt eine Porenbildung ein, so dass ein Dielektrikum mit einer sehr geringen Dielektrizitätskonstante k von weniger als 2,5 erhalten wird.