A composition comprises a compound comprising a partial structure represented by formula (1) and comprising an intermolecular bond-forming group; and a solvent. X.sup.1 and X.sup.2 each independently represent a substituted or unsubstituted ring structure having 4 to 10 ring atoms constituted taken together with a spiro carbon atom and carbon atoms of an aromatic ring. R.sup.1 and R.sup.2 each independently represent a halogen atom, a hydroxy group, a nitro group or a monovalent organic group. a1 and a2 are each independently an integer of 0 to 8. n1 and n2 are each independently an integer of 0 to 2; k1 and k2 are each independently an integer of 0 to 8. A sum of k1 and k2 is no less than 1, and a sum of a1 and k1. A sum of a2 and k2 are no greater than 8.

##STR00001##

It is an object of the present invention to provide a sulfonic acid group-containing polymer and a sulfonic acid group-containing aromatic compound, which have excellent proton conductivity even under the low humidification condition, are excellent in mechanical strength and chemical stability and, moreover, can attain high output and excellent physical durability when processed into a solid polymer fuel cell, as well as a polymer electrolyte material, a polymer electrolyte molded product and a solid polymer fuel cell respectively using the same. The sulfonic acid group-containing polymer of the present invention is a sulfonic acid group-containing polymer comprising a constituent unit containing a sulfonic acid group (A1), and a constituent unit not containing a sulfonic acid group (A2), wherein the polymer contains a constituent unit having a specified structure as at least one constituent unit containing a sulfonic acid group (A1) at 25 mol % or more based on a sum of the constituent unit containing a sulfonic acid group (A1). Further, the polymer electrolyte material, polymer electrolyte molded product and solid polymer fuel cell of the present invention are constituted using such a sulfonic acid group-containing polymer.

This invention provides a cell culture substrate comprising on its surface a fluorine-containing polymer that enables three-dimensional tissue culture. The cell culture substrate of the invention has a surface at least a part of which is composed of a resin composition comprising a fluorine-containing polymer having one or more fluorine atoms in a repeating unit and exhibits the oxygen gas permeability of 219 cm.sup.3 (STP)/(m.sup.2.Math.24 h.Math.atm) or higher. Three-dimensional tissue can be formed via cell culture with the use of the cell culture substrate of the invention.

A composition comprises a compound comprising a partial structure represented by formula (1) and comprising an intermolecular bond-forming group; and a solvent. X.sup.1 and X.sup.2 each independently represent a substituted or unsubstituted ring structure having 4 to 10 ring atoms constituted taken together with a spiro carbon atom and carbon atoms of an aromatic ring. R.sup.1 and R.sup.2 each independently represent a halogen atom, a hydroxy group, a nitro group or a monovalent organic group. a1 and a2 are each independently an integer of 0 to 8. n1 and n2 are each independently an integer of 0 to 2; k1 and k2 are each independently an integer of 0 to 8. A sum of k1 and k2 is no less than 1, and a sum of a1 and k1. A sum of a2 and k2 are no greater than 8.

##STR00001##

Polycyclocarbonate compounds and upgraded molecular weight polymers made from such compounds are provided. The polymers have particular utility in coating compositions, especially for use on food and beverage contact substrates that are formed into or will be formed into containers or container components.

A polymer electrolyte composition has excellent practicality and excellent chemical stability as to be able to withstand a strong oxidizing atmosphere during fuel cell operation and is able to achieve excellent proton conductivity under a low-humidified condition and excellent mechanical strength and physical durability, and a polymer electrolyte membrane, a membrane-electrode assembly, and a polymer electrolyte fuel cell produced therefrom. The polymer electrolyte composition includes an ionic group-containing polymer (A), an azole ring-containing compound (B), and a transition metal-containing additive (C), the transition metal being one or more selected from the group consisting of cobalt, nickel, ruthenium, rhodium, palladium, silver, and gold.