A prepreg having low water absorption, and having remarkably suppressed deterioration in insulation resistance over time, and further having excellent heat resistance, a metal foil-clad laminate using the prepreg, and a printed wiring board using the metal foil-clad laminate are provided. A prepreg of the present invention is obtained by impregnating or coating a base material (D) with a resin composition comprising: a naphthol-modified dimethylnaphthalene formaldehyde resin (A); an epoxy resin (B) having an epoxy equivalent of 200 to 400 g/eq.; and an inorganic filler (C).

There is provided an aromatic hydrocarbon formaldehyde resin obtained by reacting an aromatic hydrocarbon compound (A) represented by the following formula (1) with formaldehyde (B) in the presence of an acidic catalyst. ##STR00001##
wherein R represents an organic group having 1 to 10 carbon atoms; m and n represent integers satisfying 1m+n10, m0 and n1.

There is provided an aromatic hydrocarbon formaldehyde resin obtained by reacting an aromatic hydrocarbon compound (A) represented by the following formula (1) with formaldehyde (B) in the presence of an acidic catalyst. ##STR00001##
wherein R represents an organic group having 1 to 10 carbon atoms; m and n represent integers satisfying 1m+n10, m0 and n1.

Embodiments of the present disclosure relate to an ion conductive polymer including a repeating unit of formula 1.

##STR00001##

wherein in Formula 1, A.sup.+ is quaternary ammonium, B.sup.+ is an anion, a is an integer of 1 to 3, R.sup.1 is an organic group having 1 to 10 carbon atoms, R.sup.2 is H or an organic group having 1 to 10 carbon atoms, R.sup.3 is an organic group having 1 to 20 carbon atoms which includes at least one of an alkylene group or an arylene group, and Ar is a benzene ring.

Embodiments of the present disclosure relate to an ion conductive polymer including a repeating unit of formula 1.

##STR00001##

wherein in Formula 1, A.sup.+ is quaternary ammonium, B.sup.+ is an anion, a is an integer of 1 to 3, R.sup.1 is an organic group having 1 to 10 carbon atoms, R.sup.2 is H or an organic group having 1 to 10 carbon atoms, R.sup.3 is an organic group having 1 to 20 carbon atoms which includes at least one of an alkylene group or an arylene group, and Ar is a benzene ring.

Polymers for use as an Anion Exchange Membranes (AEMs) and produce an alkaline stable AEM. The multinuclear aromatic and amine-functionalized acetal (ketal) come together to form a polymer with a hydrocarbon backbone that is stable to alkaline conditions. The use of an amine-functionalized acetal allows for the incorporation of a stable cation, dimethyl piperidinium, in the most stable confirmation while avoiding incorporation of a CF3 group with every cation. The amines within the amine-functionalized polyaromatic that results from this polymerization are quaternized to form the desired cationic groups to create an AEM that is mechanically robust, conductive, and stable.

Polymers for use as an Anion Exchange Membranes (AEMs) and produce an alkaline stable AEM. The multinuclear aromatic and amine-functionalized acetal (ketal) come together to form a polymer with a hydrocarbon backbone that is stable to alkaline conditions. The use of an amine-functionalized acetal allows for the incorporation of a stable cation, dimethyl piperidinium, in the most stable confirmation while avoiding incorporation of a CF3 group with every cation. The amines within the amine-functionalized polyaromatic that results from this polymerization are quaternized to form the desired cationic groups to create an AEM that is mechanically robust, conductive, and stable.