The invention provides a polyester resin for heat-shrinkable film which contains terephthalic acid as a main component of a dicarboxylic acid component, contains ethylene glycol as a main component of a diol component, and contains from 18 to 32% by mole of neopentyl glycol and from 7 to 15% by mole of diethylene glycol when a total amount of the whole diol component in total polyester resin components is taken as 100% by mole. The polyester resin has (i) an intrinsic viscosity (IV) of not less than 0.65 and less than 0.70 dl/g, (ii) a carboxyl end group concentration (AV) of 8-25 eq/t, (iii) a color b value of 1.0-8.0 in an L*a*b* color system, and (iv) aluminum and phosphorus atoms, wherein the aluminum atoms are present in an amount of 15-40 ppm, and wherein the molar ratio of the phosphorus atoms to the aluminum atoms is 1.8-2.6.

The present disclosure covers the use of polymers or copolymers having a naphthalene-type unit in their structure as heterogeneous hydrogen transfer agents for hydrogenation, hydrotreatment or reduction reactions. These heterogeneous hydrogen transfer agents may or may not be supported on metallic oxides and may be used in the presence of reducing agents such as hydrogen or methane. These hydrogen donors, being solid at the reaction temperature, may be recovered from the reaction mixture and reused, and are thermally and chemically stable at temperatures up to above 450 C.

The present disclosure covers the use of polymers or copolymers having a naphthalene-type unit in their structure as heterogeneous hydrogen transfer agents for hydrogenation, hydrotreatment or reduction reactions. These heterogeneous hydrogen transfer agents may or may not be supported on metallic oxides and may be used in the presence of reducing agents such as hydrogen or methane. These hydrogen donors, being solid at the reaction temperature, may be recovered from the reaction mixture and reused, and are thermally and chemically stable at temperatures up to above 450 C.

A resin comprising a unit of Chemical Formula 1, a method for preparing the same, a resin composition comprising the same, and a molded article comprising the resin composition are described:

##STR00001##

wherein all variables are described herein.

A resin comprising a unit of Chemical Formula 1, a method for preparing the same, a resin composition comprising the same, and a molded article comprising the resin composition are described:

##STR00001##

wherein all variables are described herein.

An active ester resin comprising one or more of -methylbenzyl groups per one molecule is capable of achieving an excellent dielectric dissipation factor in a high temperature environment.

An active ester resin comprising one or more of -methylbenzyl groups per one molecule is capable of achieving an excellent dielectric dissipation factor in a high temperature environment.

A resin composition and a filter element are provided. The resin composition includes a black coloring agent (A), an ethylenically-unsaturated monomer (B), a solvent (C), a resin (D), and a photoinitiator (E). The black coloring agent (A) includes a titanium black (A-1) and a carbon black (A-2). Based on a total usage amount of 100 parts by weight of the titanium black (A-1) and the carbon black (A-2), a usage amount of the titanium black (A-1) is 50 parts by weight to 75 parts by weight.

A resin composition and a filter element are provided. The resin composition includes a black coloring agent (A), an ethylenically-unsaturated monomer (B), a solvent (C), a resin (D), and a photoinitiator (E). The black coloring agent (A) includes a titanium black (A-1) and a carbon black (A-2). Based on a total usage amount of 100 parts by weight of the titanium black (A-1) and the carbon black (A-2), a usage amount of the titanium black (A-1) is 50 parts by weight to 75 parts by weight.

A modified copolyester composition includes a copolymer obtained by subjecting a stoichiometric mixture of an aromatic dicarboxylic acid-based component and a diol component to a polycondensation reaction, wherein the diol component includes a major amount of a C.sub.2-C.sub.4 aliphatic diol and a minor amount of an aromatic diol compound represented by Formula (I) defined herein, and wherein the dicarboxylic acid-based component is selected from the group consisting of an aromatic dicarboxylic acid, an aromatic dicarboxylic dialkyl ester, and a combination thereof.