The present invention relates to a process for preparing polyoxyalkylene polyester polyols by reacting a starter compound having Zerewitinoff-active H atoms, a cyclic dicarboxylic acid anhydride and a fatty acid ester with an alkylene oxide in the presence of a basic catalyst. The invention further relates to polyoxyalkylene polyester polyols resulting from the method and to a preparation method for polyurethanes by reaction of the polyoxyalkylene polyester polyols according to the invention.

The present invention relates to a process for preparing polyoxyalkylene polyester polyols by reacting a starter compound having Zerewitinoff-active H atoms, a cyclic dicarboxylic acid anhydride and a fatty acid ester with an alkylene oxide in the presence of a basic catalyst. The invention further relates to polyoxyalkylene polyester polyols resulting from the method and to a preparation method for polyurethanes by reaction of the polyoxyalkylene polyester polyols according to the invention.

Thermal treatment of purified 2,5-furandicarboxylic acid (FDCA) for producing a carboxylic acid composition, the process comprising the steps of providing or producing a thermal treatment composition comprising a purified carboxylic acid composition and a water containing treatment solvent composition; subjecting the thermal treatment composition to an elevated temperature, wherein the FDCA is partially dissolved, and cooling the treated composition and separating at least a portion of the FDCA from the treated composition to obtain a carboxylic acid composition.

Thermal treatment of purified 2,5-furandicarboxylic acid (FDCA) for producing a carboxylic acid composition, the process comprising the steps of providing or producing a thermal treatment composition comprising a purified carboxylic acid composition and a water containing treatment solvent composition; subjecting the thermal treatment composition to an elevated temperature, wherein the FDCA is partially dissolved, and cooling the treated composition and separating at least a portion of the FDCA from the treated composition to obtain a carboxylic acid composition.

The purpose of the present invention is to provide a thermoplastic resin far an optical lens. In order to enable an optical lens designer to use a variety of lenses, the thermoplastic resin should have a low refractive index, a low Abbe number and a water absorption rate similar to that of a polycarbonate resin. The present invention relates to a thermoplastic resin which contains repeating units represented by formula (1), formula (2) and formula (3) and which has a refractive index of 1.510-1.570. In formula (I), R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each independently a hydrogen atom or a hydrocarbon group having 1-10 carbon atoms. In formula (3), n is 1-8, R moieties are each independently selected from among a hydrogen atom or an alkyl group having 1-3 carbon atoms, and R.sub.5 and R.sub.6 are each independently a hydrogen atom or a hydrocarbon group having 1-10 carbon atoms.

The purpose of the present invention is to provide a polyester resin or polyester carbonate resin, which has high refractive index, while achieving an excellent balance between heat resistance and low birefringence. A polyester resin or a polyester carbonate resin, which contains repeating units represented by the following formulae (1) and (2), and wherein the ratio of the repeating unit represented by formula (1) to the repeating unit represented by formula (2) is 15:85 to 85:15. (In formula (1), each of rings Z.sup.1 and Z.sup.2 represents a polycyclic aromatic hydrocarbon group having 9-20 carbon atoms; each of R.sup.1, R.sup.2, R.sup.7 and R.sup.8 independently represents a hydrocarbon group which may contain an aromatic group having 1-12 carbon atoms; each of R.sup.3-R.sup.6 and R.sup.9-R.sup.16 represents a hydrogen atom or an aliphatic or aromatic substituents; each of j, k, r and s independently represent an integer of 0 or more; and each of m, n, p and q independently represents 1 or 2) (In formula (2), each of R.sup.7, R.sup.8, R.sup.17 and R.sup.18 independently represent a hydrocarbon group which may contain an aromatic group having 1-12 carbon atoms; each of R.sup.9-R.sup.16 and R.sup.19-R.sup.26 represents a hydrogen atoms or an aliphatic or aromatic substituents; and each of r, s, t and u independently represents an integer of 0 or more.)

The purpose of the present invention is to provide a polyester resin or polyester carbonate resin, which has high refractive index, while achieving an excellent balance between heat resistance and low birefringence. A polyester resin or a polyester carbonate resin, which contains repeating units represented by the following formulae (1) and (2), and wherein the ratio of the repeating unit represented by formula (1) to the repeating unit represented by formula (2) is 15:85 to 85:15. (In formula (1), each of rings Z.sup.1 and Z.sup.2 represents a polycyclic aromatic hydrocarbon group having 9-20 carbon atoms; each of R.sup.1, R.sup.2, R.sup.7 and R.sup.8 independently represents a hydrocarbon group which may contain an aromatic group having 1-12 carbon atoms; each of R.sup.3-R.sup.6 and R.sup.9-R.sup.16 represents a hydrogen atom or an aliphatic or aromatic substituents; each of j, k, r and s independently represent an integer of 0 or more; and each of m, n, p and q independently represents 1 or 2) (In formula (2), each of R.sup.7, R.sup.8, R.sup.17 and R.sup.18 independently represent a hydrocarbon group which may contain an aromatic group having 1-12 carbon atoms; each of R.sup.9-R.sup.16 and R.sup.19-R.sup.26 represents a hydrogen atoms or an aliphatic or aromatic substituents; and each of r, s, t and u independently represents an integer of 0 or more.)

The present invention relates to a polyester resin. The polyester resin contains a particular content of diol moieties, derived from isosorbide and diethylene glycol, and thus can provide a resin molded product exhibiting high transparency in spite of a large wall thickness thereof.

The present invention relates to a polyester resin. The polyester resin contains a particular content of diol moieties, derived from isosorbide and diethylene glycol, and thus can provide a resin molded product exhibiting high transparency in spite of a large wall thickness thereof.

The present invention relates to an MDO heat-shrinkable film of a copolymer polyester having excellent thermal resistance. In particular, the present invention provides a copolymer polyester MDO (machine direction orientation) thermoresistant heat-shrinkable film that consists of a copolymer polyester resin including isosorbide and 1,4-cyclohexanedimethanol at an optimized content ratio as a diol component copolymerized with an acid component including terephthalic acid, and having a number average molecular weight of 18,000 g/mol or more, and can be used for labels, cap seals, direct packaging, etc. of various containers due to the high shrink initiation temperature.