Provided is a compound that can be used as a base resin for a photosensitive resin composition. The photosensitive resin can form a fine pattern and can achieve high resolution without impairing mechanical strength and solubility. The compound is represented by the general formula (1): ##STR00001##
wherein Z represents a linear, branched or cyclic divalent hydrocarbon group having 2 to 30 carbon atoms; X.sup.1 to X.sup.3 represent any of —CO.sub.2—, —CONR.sup.X1—, —O—, —NR.sup.X1—, —S—, —SO.sub.2—, —SO.sub.3— and —SO.sub.2NR.sup.X1— and may be the same as or different from each other, provided that R.sup.X1 is a hydrogen atom or a monovalent hydrocarbon group having 1 to 30 carbon atoms; Ar represents a divalent aromatic group having 2 to 30 carbon atoms; L.sup.1 and L.sup.2 independently represent a divalent hydrocarbon group having 1 to 30 carbon atoms; and x and y are each independently 0 or 1.

Provided is a compound that can be used as a base resin for a photosensitive resin composition. The photosensitive resin can form a fine pattern and can achieve high resolution without impairing mechanical strength and solubility. The compound is represented by the general formula (1):

##STR00001##

wherein Z represents a linear, branched or cyclic divalent hydrocarbon group having 2 to 30 carbon atoms; X.sup.1 to X.sup.3 represent any of —CO.sub.2—, —CONR.sup.X1—, —O—, —NR.sup.X1—, —S—, —SO.sub.2—, —SO.sub.3— and —SO.sub.2NR.sup.X1— and may be the same as or different from each other, provided that R.sup.X1 is a hydrogen atom or a monovalent hydrocarbon group having 1 to 30 carbon atoms; Ar represents a divalent aromatic group having 2 to 30 carbon atoms; L.sup.1 and L.sup.2 independently represent a divalent hydrocarbon group having 1 to 30 carbon atoms; and x and y are each independently 0 or 1.

Provided is a phthalonitrile-based resin, comprising repeat units formed by the reaction of a phthalonitrile compound and a curing agent, wherein the phthalonitrile compound comprises 4,4-bis(3,4-dicyanophenoxy)diphenyloxide of the following Chemical Formula 1 and 4,4-bis(3,4-dicyanophenoxy)biphenyl of the following Chemical Formula 2 at a weight ratio of 30:70 to 90:10: ##STR00001##

A polymer is disclosed, which includes a structure of Formula 1 or Formula 2. ##STR00001##
R.sup.1 is a C.sub.2-18 alkylene group or a C.sub.6-18 arylene group, R.sup.2 is a C.sub.1-18 alkyl group, and R.sup.3 is a functional group of Formula 3. ##STR00002##
Each of X.sup.1, X.sup.2, X.sup.3, X.sup.4, X.sup.5, and X.sup.6, being the same or different, is H or methyl. Each of p, q, and r, being the same or different, is an integer of 1 to 60. R.sup.4 is C.sub.2H.sub.4, C.sub.3H.sub.6, ##STR00003##
Each of m and n, being the same or different, is an integer of 0 to 50, and m+n0.

The present invention relates to the flotation of non-sulfidic minerals and ores. Particularly the present invention relates to a collector for the beneficiation of non-sulfidic minerals and ores.