Abstract: A hydrocarbon resin polymer is provided. The hydrocarbon resin polymer includes: 0.15-15 mol % of repeating units (A), which are derived from bridged ring monomer compounds; 15-90 mol % of repeating units (B), which are derived from monovinyl aromatic compounds; and 8-80 mol % of repeating units (C), which are derived from divinyl aromatic compounds.

Abstract: A method for preparing a modified copolyester includes the steps of: i) subjecting a mono(2-hydroxylalkyl)dicarboxylate to an esterification reaction with an isosorbide to form an intermediate; and ii) subjecting the intermediate to a condensation polymerization in the presence of a condensation polymerization catalyst. The method may enhance the reactivity of isosorbide, reduce the amount of water by-product, and raise the glass transition temperature and the color stability of the copolyester thus obtained.

Abstract: A method for preparing a modified copolyester includes the steps of: i) subjecting a mono(2-hydroxylalkyl)dicarboxylate to an esterification reaction with an isosorbide to form an intermediate; and ii) subjecting the intermediate to a condensation polymerization in the presence of a condensation polymerization catalyst. The method may enhance the reactivity of isosorbide, reduce the amount of water by-product, and raise the glass transition temperature and the color stability of the copolyester thus obtained.

Abstract: An oxygen-scavenging composition includes a sulfide group-containing polyester and a catalyst. The sulfide group-containing polyester is obtained by subjecting a reaction composition to esterification and condensation reactions. The reaction composition includes an aromatic diacid component and a diol component including aliphatic diol and a diol compound represented by the following formula (I): HO—(X1—O)n—X3—S—X4—(O—X2)m—OH??(I) wherein X1 and X2 independently represent a C1-C6 alkylene group, X3 and X4 represent a C6-C10 arylene group, and m and n represent an integer ranging from 1 to 5. The catalyst is for inducing reaction between the sulfide group-containing polyester and oxygen.

Abstract: A reactant composition includes: a diol component; a diacid-derived component; and a modifier represented by the following formula (I): wherein R1, R2, and R3 independently represent H or a methyl group, and at least one of R1, R2, and R3 is a methyl group. A polyester made from the reactant composition is also disclosed.

Abstract: A method for preparing a biodegradable copolyester includes: (a) optionally preparing an aromatic prepolymer by reacting a first aromatic dicarboxylic compound with a first aliphatic glycol; (b) reacting the aromatic prepolymer with a second aromatic dicarboxylic compound and a second aliphatic glycol so as to form a first reaction product; (c) reacting the first reaction product with an aliphatic dicarboxylic compound so as to form a second reaction product; and (d) performing polycondensation of the second reaction product.

Abstract: A method for preparing a biodegradable copolyester includes: (a) optionally preparing an aromatic prepolymer by reacting a first aromatic dicarboxylic compound with a first aliphatic glycol; (b) reacting the aromatic prepolymer with a second aromatic dicarboxylic compound and a second aliphatic glycol so as to form a first reaction product; (c) reacting the first reaction product with an aliphatic dicarboxylic compound so as to form a second reaction product; and (d) performing polycondensation of the second reaction product.