A phenol derivative of the present invention has a structure as represented by the formula (I):

##STR00001##

The functional groups are defined in the description. The phenol derivative can be used as the antioxidant in lubricating oil, lubricating grease, plastic, rubber, or can be used as the base oil of the lubricating oil and the lubricating grease and the antiwear additive of the lubricating oil and the lubricating grease.

Provided is an epoxy reactive diluent, wherein the content of a compound represented by Formula 1 below is 85% by weight or more based on a total weight of an epoxy reactive diluent composition:

##STR00001## wherein n is 0, 2, 4 or 6.

Provided is an epoxy reactive diluent, wherein the content of a compound represented by Formula 1 below is 85% by weight or more based on a total weight of an epoxy reactive diluent composition:

##STR00001## wherein n is 0, 2, 4 or 6.

A multi-epoxidized biphenyl compound has the formula (I) below

##STR00001##

wherein R, R.sub.1, R.sub.2 and R.sub.3 are as defined in the description, as well as mixtures of at least two of the compounds. These multi-epoxidized biphenyl compounds are fully suitable as main constituents of thermosetting epoxy resins, i.e. as polyepoxides precursors. They are beneficial substitutes for bisphenol A diglycidyl ether.

A multi-epoxidized biphenyl compound has the formula (I) below

##STR00001##

wherein R, R.sub.1, R.sub.2 and R.sub.3 are as defined in the description, as well as mixtures of at least two of the compounds. These multi-epoxidized biphenyl compounds are fully suitable as main constituents of thermosetting epoxy resins, i.e. as polyepoxides precursors. They are beneficial substitutes for bisphenol A diglycidyl ether.

The present invention discloses polyglycol epoxide crosslinked sodium hyaluronate gel for injection and a preparation method thereof. A polyglycol epoxide is a compound with single molecular weight preferably; a plurality of ether bonds are present in the molecule of the polyglycol epoxide, the water solubility is good, and thus, the polyglycol epoxide is more easily subjected to a crosslinking reaction with polysaccharides; and meanwhile, polyglycol is relatively easy in adjustment of the number of repeating units and relatively easy in control of length, and thus, the sodium hyaluronate gel prepared by taking the polyglycol epoxide as a crosslinker is relatively easy in regulation and control of properties. The crosslinked sodium hyaluronate gel is low in toxicity, little in residual, small in squeezing and pushing force, good in shaping performance, good in enzyme resistance and long in in-vivo retention time. The present invention further discloses a mild crosslinker deactivation technology. Unreacted epoxide groups in the gel are subjected to a hydrolysis reaction in a carbonate buffer system with a pH of 8-9, so that the difficulty of impurity removal of the crosslinked sodium hyaluronate gel can be effectively lowered, and the problem of toxicity in the prior art due to the fact that BDDE is used in a crosslinking method is avoided.

Dental root canal filling composition comprising (a) one or more diepoxides; (b) one or more primary monoamines and/or disecondary diamines; (c) a particulate filler, wherein the one or more diepoxides are selected from compounds of the following formula (I) or a salt thereof:

##STR00001##

A radiation-sensitive resin composition capable of forming a resin film for which development residue formation is sufficiently inhibited and that has excellent extensibility. The radiation-sensitive resin composition contains: a cycloolefin polymer (A-1) including a protonic polar group; a cycloolefin polymer (A-2) including a protonic polar group; a difunctional epoxy compound (B); and a radiation-sensitive compound (C). The cycloolefin polymer (A-1) has a weight-average molecular weight of not less than 1,000 and less than 10,000, and the cycloolefin polymer (A-2) has a weight-average molecular weight of not less than 10,000 and not more than 100,000. Content of the cycloolefin polymer (A-2) is not less than 5 mass % and not more than 55 mass % of total content of the cycloolefin polymer (A-1) and the cycloolefin polymer (A-2).

Provided is an epoxy reactive diluent, wherein the content of a compound represented by Formula 1 below is 85% by weight or more based on a total weight of an epoxy reactive diluent composition: ##STR00001## wherein n is 0, 2, 4 or 6.

Provided is an epoxy reactive diluent, wherein the content of a compound represented by Formula 1 below is 85% by weight or more based on a total weight of an epoxy reactive diluent composition: ##STR00001## wherein n is 0, 2, 4 or 6.