The present invention relates to liquid crystal polyester resin pellets containing a thermoplastic resin comprising a liquid crystal polyester, and a fibrous filler, in which the pellets contain the fibrous filler in the amount of equal to or greater than 1 part by mass and smaller than 120 parts by mass with respect to 100 parts by mass of the thermoplastic resin, and a length-weighted average fiber length of the fibrous filler is equal to or greater than 4 mm and smaller than 50 mm.

In various embodiments, the present invention is directed to ABA triblock copolymers having crosslinkable poly(propylene fumarate A blocks and a more flexible poly(lactone) B block formed by sequential ring-opening polymerization and ring-opening copolymerization. These ABA triblock polymers made using ring-opening polymerization of one or more lactone monomers using a bifunctional initiator to form a poly(lactone) B block having terminal hydroxyl groups and the ring-opening copolymerization of maleic anhydride and propylene oxide followed by isomerization of the maleate double bond using an organic base to form the poly(propylene fumarate)(PPF) A blocks. When crosslinked photochemically using, for example, a continuous liquid interface production digital light processing (DLP) Carbon M2 printer, these ABA type triblock copolymers form durable elastomers with tunable degradation and elastic properties. In various embodiments, these polymers are shown to undergo slow, hydrolytic degradation in vitro with minimal loss of mechanical performance during degradation.

In various embodiments, the present invention is directed to ABA triblock copolymers having crosslinkable poly(propylene fumarate A blocks and a more flexible poly(lactone) B block formed by sequential ring-opening polymerization and ring-opening copolymerization. These ABA triblock polymers made using ring-opening polymerization of one or more lactone monomers using a bifunctional initiator to form a poly(lactone) B block having terminal hydroxyl groups and the ring-opening copolymerization of maleic anhydride and propylene oxide followed by isomerization of the maleate double bond using an organic base to form the poly(propylene fumarate)(PPF) A blocks. When crosslinked photochemically using, for example, a continuous liquid interface production digital light processing (DLP) Carbon M2 printer, these ABA type triblock copolymers form durable elastomers with tunable degradation and elastic properties. In various embodiments, these polymers are shown to undergo slow, hydrolytic degradation in vitro with minimal loss of mechanical performance during degradation.

A liquid crystal polymer resin composition is provided containing a component (A) liquid crystal polymer, a component (B′) carbon fiber having a weight-average fiber length of less than 150 μm, and a component (C) carbon precursor having a volume resistivity of 10.sup.2 to 10.sup.10 Ω.Math.cm, in which a content of the component (B′) is 10 to 30 parts by mass with respect to 100 parts by mass of the component (A), a content of the component (C) is 5 to 35 parts by mass with respect to 100 parts by mass of the component (A), and a content of a total of the component (B) and the component (C) is 25 to 60 parts by mass with respect to 100 parts by mass of the component (A).

The present invention is a method for producing a liquid crystalline polyester, which comprises reacting an aromatic hydroxycarboxylic acid, a diol containing 70 mol % or more of an aromatic diol having a structural unit (I) as shown below and an aromatic dicarboxylic acid with one another in the presence of an acylating agent and an aliphatic sulfonic acid represented by formula (A) shown below. (wherein Ar represents a bivalent aromatic group which is an aromatic hydrocarbon group and has a molecular weight of less than 200) Formula (A) R—SO.sub.3H (wherein R represents an alkyl group having 1 to 12 carbon atoms) According to the present invention, a liquid crystalline polyester, which can be molded into an article having excellent tensile strength and excellent creep properties and from which a gas is generated in a reduced amount, can be produced with high efficiency.

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 .sup.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 .sup.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.

Provided are a thermoplastic polymer capable of reducing a dielectric dissipation factor in high frequency bands and a film thereof. The thermoplastic liquid crystal polymer includes repeating units represented by the following formulae (I), (II), (III) and (IV), in which a molar ratio of a total amount of the repeating units represented by formulae (I) and (II) to a total amount of all the repeating units in the thermoplastic liquid crystal polymer is 50 to 90 mol %, and a molar ratio of the repeating unit represented by formula (III) to the repeating unit represented by formula (IV) is the former/the latter=23/77 to 77/23.

The instant invention provides a polyester composition, method of producing the same, coating compositions made therefrom, and coating layers made from such coatings. The thermoset polyester composition according to the present inventions comprises the reaction product of: (a) one or more polyacids comprising at least 50 percent by the combined weight of one or more aromatic diacids; and (b) one or more polyols comprising at least 40 percent by the combined weight of 1,4-cyclohexanedimethanol and 2,2,4,4-tetramethylcyclobutanediol; wherein said polyester composition has a glass transition temperature in the range of from 70 to 125° C., a number average molecular weight between 6,000 and 20,000, a hydroxyl number in the range of from 4 to 18.

This disclosure relates to an aliphatic-aromatic copolyester of poly(butylene-co-adipate terephthalate) that is prepared from recycled polyethylene terephthalate in the presence of titanium catalyst and a phosphorous containing compound. The copolyester is contaminated with little or no ethylene glycol and/or isophthalic acid, which are artifacts of preparing the copolyester from recycled PET. Advantageously, because there is little or no contamination from ethylene glycol and/or isophthalic acid in the copolyester, there is essentially no depression in the material's melting temperature.

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.