One aspect is a method for producing a first intermediate product. A feedstock is provided that comprises a first polyester. The feedstock is contacted with a first amount of a first organic compound in a volume section V.sub.1 to obtain a first initial mixture. The first amount is in the form of a liquid. The first polyester is transported, and at least a fraction of the first amount of the first organic compound, from the volume section V.sub.1 to a volume section V.sub.2. The volume section V.sub.2 is at least partially filled with the first organic compound. A level of the first organic compound in the volume section V.sub.1 is at a height H.sub.1 from a floor, and a level of the first organic compound in the volume section V.sub.2 is at a height H.sub.2 from the floor. The first polyester is contacted with a further organic compound in a volume section V.sub.3, to obtain a further initial mixture. A weight average molar mass of the first polyester is reduced in the volume section V.sub.3, to obtain a first intermediate mixture. The first intermediate mixture comprises a first intermediate product, the further organic compound.

[00001]$H_1<H_2.$

A liquid crystal polymer, composition, liquid crystal polymer film, laminated material and method of forming liquid crystal polymer film are provided. The liquid crystal polymer includes a first repeating unit, a second repeating unit, a third repeating unit, a fourth repeating unit, and a fifth repeating unit. The first repeating unit has a structure of Formula (I), the second repeating unit has a structure of Formula (II), the third repeating unit has a structure of Formula (III), the fourth repeating unit has a structure of Formula (IV), and the fifth repeating unit has a structure of Formula (V), a structure of Formula (VI), or a structure of Formula (VII) ##STR00001## wherein A.sup.1, A.sup.2, A.sup.3, A.sup.4, X.sup.1, Z.sup.1, R.sup.1, R.sup.2, R.sup.3 and Q are as defined in the specification.

According to the present invention, an intermediate film for a backsheet for photovoltaic modules is provided, the intermediate film comprising a substrate film, for example, a PET film, and a partially cross-linked layer of coating resin. The corresponding method for producing such an intermediate film is also presented, which involves providing a substrate film, depositing and spreading a layer of coating resin on the substrate film, and partially cross-linking the layer of coating resin. According to this method, the cross-linking of the resin is stopped before it is completed so that the intermediate film is obtained, and it is finished during the subsequent process of laminating the intermediate film to the encapsulant of a photovoltaic module.

A polymer film including a silsesquioxane polymer, in which the polymer film has a dielectric loss tangent of 0.01 or less, and applications thereof.

Provided is a liquid crystalline polyester that is excellent in dimensional stability while having a low dielectric loss tangent. The liquid crystalline polyester includes 90% by mol or more of a constitutional unit derived from an aromatic hydoxycarboxylic acid with respect to the amount of all constitutional units. In the liquid crystalline polyester, a dielectric loss tangent at a measurement frequency of 10 GHz is 1.010.sup.3 or less, a difference (anisotropy) between mold shrinkage rates in the machine direction (MD) of the injection-molded piece of the liquid crystalline polyester and a transverse direction (TD) with respect to the machine direction is 1.00 or less, and a melt viscosity measured under conditions of a shear rate of 1000/s and the melting point of the liquid crystalline polyester to the melting point+20 C. is 25 Pa.Math.s or more.

Provided are a method for producing an aromatic bis(hydroxyalkyl) dicarboxylate, comprising subjecting a polyester to depolymerization in the presence of a catalyst, in which the catalyst is a manganese catalyst, and in which the amount of the catalyst used is 20 to 500 mmol %, based on the mole of the polyester, a method for producing an aromatic bis(hydroxyalkyl) dicarboxylate by subjecting a polyester to depolymerization by the method, and a method for producing a polyester polymer by subjecting the aromatic bis(hydroxyalkyl) dicarboxylate as a raw material to repolymerization, in which these methods are a method for producing a polyester polymer having as small the degree of discoloration as that of a virgin polymer (which is produced by polymerizing a monomer, and which has not experienced depolymerization) of polyester and a method for producing an intermediate of the polyester polymer.

One aspect is a method for producing a first intermediate product. A feedstock is provided that comprises a first polyester. The feedstock is contacted with a first amount of a first organic compound in a volume section V1 to obtain a first initial mixture. The first amount is in the form of a liquid. The first polyester is contacted with a further organic compound to obtain a further initial mixture. A weight average molar mass of the first polyester is reduced to obtain a first intermediate mixture. The first intermediate mixture has a first intermediate product, the further organic compound. A mass ratio of the feedstock to the first organic compound in the volume section V1 is in the range of 0.02 to 3.

One aspect is a method for producing a first intermediate product. A feedstock is provided that comprises a first polyester. The feedstock is contacted with a first amount of a first organic compound in a volume section V.sub.1 to obtain a first initial mixture. The first amount is in the form of a liquid. The first polyester is transported, and at least a fraction of the first amount of the first organic compound, from the volume section V.sub.1 to a volume section V.sub.2. The volume section V.sub.2 is at least partially filled with the first organic compound. A level of the first organic compound in the volume section V.sub.1 is at a height H.sub.1 from a floor, and a level of the first organic compound in the volume section V.sub.2 is at a height H.sub.2 from the floor. The first polyester is contacted with a further organic compound in a volume section V.sub.3, to obtain a further initial mixture. A weight average molar mass of the first polyester is reduced in the volume section V.sub.3, to obtain a first intermediate mixture. The first intermediate mixture comprises a first intermediate product, the further organic compound. $H_1<H_2.$

Provided is a method for producing a bisphenol by removing, from a mixed solution containing a bisphenol and another resin other than a polycarbonate resin, the another resin to obtain the bisphenol, the method including a step in which the bisphenol is precipitated out of an aromatic monoalcohol-containing solution in which the bisphenol and the another resin are dissolved in a solvent containing an aromatic monoalcohol to obtain a slurry of the bisphenol, and the slurry of the bisphenol is then subjected to solid-liquid separation to obtain a crude cake of the bisphenol and a mother liquor.

The present invention relates to a process for purifying and recovering the mono-ethylene glycol (MEG) from a solution obtained from the depolymerization of at least one polyester having at least one unit of MEG. This solution is preferably obtained from an enzymatic depolymerization under alkaline conditions of polyethylene terephthalate (PET) included in a plastic product. The invention also relates to a process for recycling a polymer-containing material, such as plastic product, comprising at least one polyester having at least one unit of MEG, such as PET, and recovering the monomers thereof.