Abstract: Disclosed is a polyether ester elastomer comprising a copolymer of (A) at least one aromatic dicarboxylic acid or an ester-forming derivative thereof; (B) at least one diol selected from the group consisting of an aliphatic diol and an alicyclic diol, each having 2 to 10 carbons; and (C) a polyoxytetramethylene glycol (PTMG) having a number average molecular weight of from 500 to 4000, a molecular weight distribution (Mw/Mn) of 2.0 or less, a content of high molecular weight PTMG molecules of 10% by weight or less, and a heteropolyacid content of from 10 to 900 ppb by weight, wherein the polyether ester elastomer contains PTMG units in an amount of from 10 to 90% by weight, based on the weight of the polyether ester elastomer.

Abstract: Disclosed is a polyether polyurethane comprising (A) at least one polyisocyanate having two or more isocyanate groups, which is selected from the group consisting of an aromatic polyisocyanate and an aliphatic polyisocyanate; (B) a polyoxytetramethylene glycol (PTMG) having a number average molecular weight of from 500 to 4,000, a molecular weight distribution (Mw/Mn) of 1.75 or less, and a content of high molecular weight PTMG molecules of 10% by weight or less; and (C) at least one chain extender selected from the group consisting of a C2-C10 polyol having two or more hydroxyl groups and a C2-C10 polyamine having two or more amino groups. Also disclosed is a urethane prepolymer which comprises the above-mentioned components (A) and (B) and which has terminal isocyanate groups.

Abstract: A hydrogenated block copolymer comprising: two polymer blocks A mainly comprising vinylaromatic hydrocarbon compound monomer units; and one hydrogenated polymer block B mainly comprising butadiene monomer units, in which at least 90% of olefinically unsaturated double bonds contained in a polymer block mainly comprising butadiene monomer units before hydrogenation have been hydrogenated, wherein a bonding vinylaromatic hydrocarbon compound content in the hydrogenated block copolymer is higher than 13 wt % but lower than 25 wt %, a 1,2-bond content in the unhydrogenated polymer block mainly comprising butadiene monomer units is higher than 40 mol % but lower than 60 mol %, and the copolymer has a quantity of heat of crystal fusion (&Dgr;H) smaller than 0.05 J/g, an order-disorder transition temperature of 200° C. or higher, and a melt flow rate (MFR) value, as determined in accordance with JIS K7210 under the conditions of a temperature of 230° C. and a load of 2.16 kg, of from not smaller than 0.

Abstract: A hydrogenated block copolymer comprising: at least two polymer blocks A mainly comprising vinylaromatic hydrocarbon compound monomer units; and at least two polymer blocks B mainly comprising hydrogenated conjugated diene compound monomer units, in which at least 90% of the olefinically unsaturated double bonds contained in the unhydrogenated polymer block mainly comprising the conjugated diene compound monomer units is hydrogenated, wherein at least one of the terminal blocks is a polymer block B, the proportion of the terminal polymer block B in the hydrogenated block copolymer being 0.1% by weight or higher and lower than 9.1% by weight, and wherein the content of the vinylaromatic hydrocarbon compound units in the hydrogenated block copolymer is 12% by weight or higher and lower than 25% by weight. Also disclosed are a resin composition containing the hydrogenated block copolymer, and a molded article of the resin composition.

Abstract: Disclosed is a resin composition comprising (.alpha.) at least one polymer selected from the group consisting of a non-modified cyclic monomer unit-containing polymer and a modified cyclic monomer unit-containing polymer having a number average molecular weight of from 10,000 to 5,000,000, wherein the cyclic monomer unit is derived from a cyclic conjugated diene, and (.beta.) at least one polymer other than the polymer (.alpha.), and wherein the polymer (.alpha.) is present in an amount of at least 1% by weight, based on the total weight of the polymers (.alpha.) and (.beta.). The molecular structure of the polymer (.alpha.) which is contained in the novel resin composition of the present invention and which is selected from a non-modified cyclic monomer unit-containing polymer and a modified cyclic monomer unit-containing polymer, wherein the cyclic monomer unit is derived from a cyclic conjugated diene, can be controlled with large freedom. Therefore by combining the polymer (.alpha.) with a polymer (.beta.

Abstract: Disclosed is a polymer containing a modified cyclic monomer unit, comprising a polymer chain represented by the following formula (I): ##STR1## wherein A to F are monomer units constituting a main chain of the polymer chain, in which monomer units A to F are arranged in any order, and l to q are, respectively, weight percentages of monomer units A to F, based on the total weight of monomer units A to F; A is selected from cyclic olefin monomer units, B is selected from cyclic conjugated diene monomer units, and C to F are monomer units copolymerizable with monomer units A and B, wherein each of S to X, which are modifying groups, is a functional group or an organic compound residue containing the functional group, with the functional group containing at least one member selected from oxygen, nitrogen, sulfur, silicon, phosphorus and halogen; and wherein s to x are, respectively, weight percentages of modifying groups S to X, based on the weight of the polymer, and wherein the polymer has a number average mole