A fluorine-containing ether compound of the present invention is represented by the following General Formula (1). (In the General Formula (1), X is a trivalent atom or a trivalent atom group, A is a linking group including at least one polar group, B is a linking group having a perfluoropolyether chain, and D is a polar group or a substituent having a polar group at the end.)
[Chem. 1]
XA-B-D).sub.3  (1)

The invention provides novel flame-retardant polymers and materials, their synthesis and use. More particularly, the flame-retardant polymers are deoxybenzoin-derived polymers.

The invention provides novel flame-retardant polymers and materials, their synthesis and use. More particularly, the flame-retardant polymers are deoxybenzoin-derived polymers.

The purpose of the present invention is to provide a surface sealing material which has high storage stability and is capable of forming, on an object to be coated such as an organic EL element, a cured product layer that has less irregularity, cissing and the like, while having high surface smoothness. A surface sealing material for organic EL elements according to the present invention contains (B) a cationically polymerizable compound that comprises a cationically polymerizable functional group in each molecule and has a structure represented by formula (1) —(R—O).sub.n— (wherein R represents an alkylene group having 2-5 carbon atoms and n represents an integer of 1-150), (C) a thermal cationic polymerization initiator and (D) a leveling agent.

Disclosed are a highly functional natural material-derived epoxy resin, a preparation method therefor, and an epoxy resin curing composition using the same. The highly functional natural material-derived epoxy resin represented by chemical formula 1 is obtained by reacting a compound, represented by chemical formula 2, and epichlorohydrin (ECH), which is obtained by using glycerin as a starting material, in the presence of a hydroxide salt.

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.

There are provided a naphthol resin and an epoxy resin that impart characteristics such as high heat resistance, a low dielectric loss tangent, and a low coefficient of thermal expansion (CTE), and an epoxy resin composition including the naphthol resin or the epoxy resin as an essential component, and cured products thereof. A naphthol resin which is represented by the following formula:

##STR00001##

where R.sup.1 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and n represents the number of repetitions and is a number of 2 to 10, and in which, in terms of area ratio in GPC measurement, a ratio of components for which n=6 or more is 15% or more, and a ratio of components for which n=1 in GPC is 30% or less, and a hydroxy group equivalent is 260 to 400 g/eq.

There are provided a naphthol resin and an epoxy resin that impart characteristics such as high heat resistance, a low dielectric loss tangent, and a low coefficient of thermal expansion (CTE), and an epoxy resin composition including the naphthol resin or the epoxy resin as an essential component, and cured products thereof. A naphthol resin which is represented by the following formula:

##STR00001##

where R.sup.1 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and n represents the number of repetitions and is a number of 2 to 10, and in which, in terms of area ratio in GPC measurement, a ratio of components for which n=6 or more is 15% or more, and a ratio of components for which n=1 in GPC is 30% or less, and a hydroxy group equivalent is 260 to 400 g/eq.

A composition for forming a resist underlayer film includes: (A) a cross-linking compound that is represented by formula (I); and (D) a solvent. [In formula (I), m is an integer from 1 to 30, T is a single bond, a saturated hydrocarbon group, an aromatic group, or an unsaturated cyclic hydrocarbon group, G.sup.1, G.sup.2, G.sup.3, G.sup.4, G.sup.5, and G.sup.6 are each independently (i) or (ii), the n's are each independently an integer from 1 to 8, the n R's are each independently a hydrogen atom, an aliphatic hydrocarbon group, or an alicyclic hydrocarbon group, the A's are each independently an aryl group that may be interrupted by an alkylene group, and Z.sup.1, Z.sup.2, Z.sup.3, Z.sup.4, Z.sup.5, and Z.sup.6 are each independently an alkyl group, an aryl group, a hydroxy group, an epoxy group, or a hydrogen atom.]

The invention relates to a method for preparing an epoxy prepolymer composition comprising glycidyl ethers, said method comprising the following steps: a) placing a dianhydrohexitol into contact with another alcohol so as to obtain a composition of alcohols; b) reacting the composition of alcohols obtained in step a) with an epihalohydrin so as to obtain a reaction mixture comprising glycidyl ethers; c) recovering the epoxy prepolymer composition comprising glycidyl ethers from the reaction mixture obtained at the end of step b);
The invention also relates to an epoxy prepolymer composition that can be obtained by said method, a curable composition comprising said epoxy prepolymer composition, a polyepoxide obtained by curing said curable composition and a composite material, coating or adhesive comprising said polyepoxide.