A polymer having repeating units derived from at least one monomer selected from the group consisting of aromatic hydroxy compounds represented by the formulas (1A) and (1B), wherein the repeating units are linked to each other by direct bonding between aromatic rings:

##STR00001##

wherein each R is independently an alkyl group having 1 to 40 carbon atoms and optionally having a substituent, an aryl group having 6 to 40 carbon atoms and optionally having a substituent, an alkenyl group having 2 to 40 carbon atoms and optionally having a substituent, an alkynyl group having 2 to 40 carbon atoms, an alkoxy group having 1 to 40 carbon atoms and optionally having a substituent, a halogen atom, a thiol group, an amino group, a nitro group, a cyano group, a nitro group, a heterocyclic group, a carboxyl group, or a hydroxy group, at least one R is a group containing a hydroxy group, and each m is independently an integer of 1 to 10.

The present invention relates to resole-type phenolic resin synthesis processes using lignin, to resole-type phenolic resins comprising aldehyde, lignin, a base, urea, and optionally phenol, as well as to the use of said phenolic resins for application as an adhesive.

The invention provides: a dihydroxynaphthalene condensate which suppresses soft particle generation and is suitably usable for a composition excellent in filterability; and a method for producing the dihydroxynaphthalene condensate. In the method for producing a dihydroxynaphthalene condensate, dihydroxynaphthalene to be used has a sulfur element content of 100 ppm or less in terms of mass among constituent elements. The dihydroxynaphthalene and a condensation agent are condensed in presence of an acid or a base to produce the dihydroxynaphthalene condensate.

The invention provides: a dihydroxynaphthalene condensate which suppresses soft particle generation and is suitably usable for a composition excellent in filterability; and a method for producing the dihydroxynaphthalene condensate. In the method for producing a dihydroxynaphthalene condensate, dihydroxynaphthalene to be used has a sulfur element content of 100 ppm or less in terms of mass among constituent elements. The dihydroxynaphthalene and a condensation agent are condensed in presence of an acid or a base to produce the dihydroxynaphthalene condensate.

The present invention provides a compound comprising a condensed skeleton of an aromatic compound represented by formula (1-1) and an aromatic aldehyde represented by formula (2-1).

##STR00001##

(In the formula (1-1), A represents an aromatic ring; R is each independently an alkyl group, an aryl group, an alkenyl group, an alkynyl group, an alkoxy group, a halogen atom, a nitro group, an amino group, a carboxylic acid group, a crosslinkable group, a dissociation group, or a thiol group; k is an integer of 0 or more; and L is an integer of 1 or more.)

##STR00002##

(In the formula (2-1), B represents an aromatic ring; R is each independently an alkyl group, an aryl group, an alkenyl group, an alkynyl group, an alkoxy group, a halogen atom, a nitro group, an amino group, a carboxylic acid group, a crosslinkable group, a dissociation group, or a thiol group; p is an integer of 0 or more; and q is an integer of 1 or more, provided that at least one hydroxy group is bonded to a carbon atom adjacent to a carbon atom to which a formyl group is bonded.)

The present invention provides a compound comprising a condensed skeleton of an aromatic compound represented by formula (1-1) and an aromatic aldehyde represented by formula (2-1).

##STR00001##

(In the formula (1-1), A represents an aromatic ring; R is each independently an alkyl group, an aryl group, an alkenyl group, an alkynyl group, an alkoxy group, a halogen atom, a nitro group, an amino group, a carboxylic acid group, a crosslinkable group, a dissociation group, or a thiol group; k is an integer of 0 or more; and L is an integer of 1 or more.)

##STR00002##

(In the formula (2-1), B represents an aromatic ring; R is each independently an alkyl group, an aryl group, an alkenyl group, an alkynyl group, an alkoxy group, a halogen atom, a nitro group, an amino group, a carboxylic acid group, a crosslinkable group, a dissociation group, or a thiol group; p is an integer of 0 or more; and q is an integer of 1 or more, provided that at least one hydroxy group is bonded to a carbon atom adjacent to a carbon atom to which a formyl group is bonded.)

A bis-propylcatechol having a structure represented by formula (1):

##STR00001## wherein R.sup.1 is a divalent aliphatic hydrocarbon group having two or more carbon atoms or a divalent aromatic hydrocarbon group.

A bis-propylcatechol having a structure represented by formula (1):

##STR00001## wherein R.sup.1 is a divalent aliphatic hydrocarbon group having two or more carbon atoms or a divalent aromatic hydrocarbon group.

The subject matter of the present invention consists of formo-phenolic resins, a method for the preparation thereof, and the use of same in the extraction of uranium from an aqueous sample. The present invention also relates to novel formo-phenolic resins.

The subject matter of the present invention consists of formo-phenolic resins, a method for the preparation thereof, and the use of same in the extraction of uranium from an aqueous sample. The present invention also relates to novel formo-phenolic resins.