摘要:
Provided is a film including a thermoplastic resin, in which a relative permittivity of the film at a frequency of 1 GHz is 3 or less, a dielectric loss tangent of the film at a frequency of 1 GHz is 0.005 or less, and a molecular orientation (MOR) value of the film, which is measured by a microwave orientation meter, is in a range of 1 to 1.1.
摘要:
The invention relates to a method for producing a biomass-resource-derived polyurethane, which comprises: reacting a dicarboxylic acid and an aliphatic diol to produce a polyester polyol; and reacting the polyester polyol and a polyisocyanate compound, wherein the dicarboxylic acid contains at least one component derived from biomass resources, a content of an organic acid in the dicarboxylic acid is more than 0 ppm and not more than 1,000 ppm relative to the dicarboxylic acid, and a pKa value of the organic acid at 25° C. is not more than 3.7.
摘要:
Process for manufacturing a polymer by polycondensation of a hydroxy acid, said polymer comprising at least 80% by weight of units that correspond to the hydroxy acid, according to which at least one polyfunctional reactant capable of giving rise to the formation of a three-dimensional polymer network is mixed with the hydroxy acid, and according to which the mixture is subjected to temperature and pressure conditions and for a duration which are all suitable for giving rise to the formation of the network. Poly(hydroxy acid) (PHA) obtainable by such a process.
摘要:
Cutin-based devices, coatings and methods of producing such devices and coatings are presented herein. Cutin-like materials (CLMs) are presented which mimic and adapt coatings found in nature for the next generation of functional coatings. Cutin has several advantages including excellent UV resistance, natural resistance to bacteria and viruses, noncorrosive, and stability under abrupt changes in temperature and environment. CLMs can be engineered at the nanoscale and readily impregnated with metals and metal oxides materials.
摘要:
The present invention relates to biodegradable copolyesters with molecular weight Mn from 10 000 to 100 000 measured by GPC, obtainable via reaction of i) from 51 to 84% by weight, based on the copolyester, of a branched polyester middle block produced from aliphatic or aliphatic and aromatic dicarboxylic acids and from aliphatic dihydroxy compounds with molecular weight Mn from 5000 to 25 000 measured by 1H NMR with from 15.9 to 48.9% by weight, based on the copolyester, of a lactide in the presence of a catalyst, and then the resultant polyester triblock with molecular weight Mn measured by 1H NMR from 5800 to 49 500 with ii) from 0.1 to 3% by weight, based on the copolyester, of a diisocyanate. The present invention further relates to a process for the production of, and to the use of, the abovementioned biodegradable copolyesters.
摘要:
Polyester polyols, processes for making them, and applications for the polyols are disclosed. In some aspects, the polyols comprise recurring units from a thermoplastic polyester or an aromatic polyacid source, a glycol, and a hydroxy-functional ketal acid, ester or amide. Optionally, the polyols incorporate recurring units of a hydrophobe. The polyols are made in one or multiple steps; in some aspects, the thermoplastic polyester or aromatic polyacid source and the glycol are reacted first, followed by reaction with the hydroxy-functional ketal acid, ester or amide. The resulting polyols have good transparency and little or no particulate settling or phase separation. High-recycle-content polyols having desirable properties and attributes for formulating polyurethane products, including aqueous polyurethane dispersions, flexible and rigid foams, coatings, adhesives, sealants, and elastomers can be made. The polyols provide a sustainable alternative to bio- or petrochemical-based polyols.
摘要:
Disclosed are compositions comprising polyester macromers containing in one or more chains the residue of one or more diols and one or more diesters wherein the residue of the one or more diols and the one or more diesters alternate along the chain and a portion of the diesters are 1,1-diester-1-alkenes, and optionally one or more dihydrocarbyl dicarboxylates, and at least one terminal end comprises the residue of one of the 1,1-diester-1 alkenes and wherein one or more terminal ends may comprise the residue of one or more diols. The chains may contain the residue of the one or more diols and one or more diesters comprising one or more diesters 1,1-diester-1 alkenes and optionally one or more dihydrocarbyl dicarboxylates randomly disposed along the chains. Disclosed are methods of preparing the polyester macromers and incorporating them in a variety of polyester containing compositions such as coatings and films.
摘要:
This disclosure relates to a thermo-shrinkable polyester film with excellent UV absorbance and heat resistance. According to one embodiment of the invention, provided is a thermo-shrinkable polyester film comprising a first resin layer comprising polyester resin comprising residues of dicarboxylic acid components comprising aromatic dicarboxylic acid, and residues of diol components comprising 4-(hydroxymethyl)cyclohexylmethyl 4′-(hydroxymethyl)cyclohexanecarboxylate, and 4,4-(oxybis(methylene)bis)cyclohexane methanol; and a second resin layer comprising the polyester resin and a UV absorber, formed on at least one side of the first layer.
摘要:
A process for preparing a polymer having a 2,5-furandicarboxylate moiety within the polymer backbone and having a number average molecular weight of at least 10,000 (as determined by GPC based on polystyrene standards) includes a first step where a prepolymer is made having the 2,5-furandicarboxylate moiety within the polymer backbone, followed in a second step by a polycondensation reaction. In the first step a 2,5-furandicarboxylate ester is transesterified with a compound or mixture of compounds containing two or more hydroxyl groups, in the presence of a tin(IV) based transesterification catalyst. In the second step at reduced pressure and under melt conditions the prepolymer prepared in the first step is polycondensed in the presence of a tin (II) based polycondensation catalyst until the polymer is obtained. This polymer may then be subjected to Solid State Polycondensation. Polymers so produced may have a 2,5-furandicarboxylate moiety within the polymer backbone, and having a number average molecular weight of at least 20,000 (as determined by GPC based on styrene standards), and an absorbance as a 5 mg/mL solution in a dichloromethane:hexafluoroisopropanol 8:2 at 400 nm of below 0.05.
摘要:
An object of the present invention is to provide a liquid crystal polyester-containing liquid composition which is capable of producing a prepreg and a resin film in which surface defects are remarkably reduced even in case of drying at high temperature to remove the solvent in the production process. Disclosed Are a liquid crystal polyester-containing liquid composition comprising a liquid crystal polyester, an organic solvent, and one or more kinds of selected leveling agents, wherein the content of the leveling agent is from 0.001 to 2.0 parts by mass based on 100 parts by mass of the total amount of the liquid crystal polyester and the organic solvent; and a method for producing a resin film, which comprises applying the above-described liquid crystal polyester-containing liquid composition on a support, and then removing the solvent from the liquid crystal polyester-containing liquid composition on the support at 50° C. or higher.