Abstract: Disclosed is a select class of liquid crystalline polyesters and molding compositions comprising the polyesters and glass fiber. The liquid crystalline polyesters consist essentially of (1) diacid residues consisting essentially of (i) cyclohexanedicarboxylic acid residues and (ii) other diacid residues selected from terephthalic acid residues, 2,6-naphthalene-dicarboxylic acid residues, or a mixture thereof; (2) diol residues consisting essentially of hydroquinone residues, 4,4′-biphenol residues or a mixture thereof; and, optionally, (3) p-hydroxybenzoic acid residues. In the above definition, the moles of diol residues are equal to the moles of diacid residues and the total of the (1), (2) and (3) mole percentages is equal to 100. The liquid crystalline polyesters have melting points determined by differential scanning calorimetry equal to or less than 360° C.

Abstract: Disclosed are novel compositions containing an LCP and one or more aromatic phosphonites. Also disclosed is a novel process for preparing LCPs in the presence of one or more aromatic phosphonites. The process enables the preparation of LCPs in a more controlled manner so that the LCPs have excellent thermal/oxidative stability. The LCPs are useful where the combination of good mechanical properties, excellent thermal resistance properties, and excellent thermal stability are desired, such as in electrical/electronic applications and electrical connectors.

Abstract: Disclosed is a select class of liquid crystalline polyesters and molding compositions comprising the polyesters and glass fiber. The liquid crystalline polyesters consist essentially of (1) diacid residues consisting essentially of (i) cyclohexanedicarboxylic acid residues and (ii) other diacid residues selected from terephthalic acid residues, 2,6-naphthalenedicarboxylic acid residues, or a mixture thereof; (2) diol residues consisting essentially of hydroquinone residues, 4,4′-biphenol residues or a mixture thereof; and, optionally, (3) p-hydroxybenzoic acid residues. In the above definition, the moles of diol residues are equal to the moles of diacid residues and the total of the (1), (2) and (3) mole percentages is equal to 100. The liquid crystalline polyesters have melting points determined by differential scanning calorimetry equal to or less than 360° C.

Abstract: This invention relates to a polycarbonate represented by the formula (I): wherein R1 is H, alkyl, aryl, R2 is alkyl, aryl, or alkoxy, R3 and R4 are alkyl or aryl having 1 to 20 carbons, and n is from 100 to 100,000.

Abstract: Disclosed is a select class of liquid crystalline polyesters and molding compositions comprising the polyesters and glass fiber. The liquid crystalline polyesters consist essentially of (1) diacid residues consisting essentially of (i) cyclohexanedicarboxylic acid residues and (ii) other diacid residues selected from terephthalic acid residues, 2,6-naphthalene-dicarboxylic acid residues, or a mixture thereof; (2) diol residues consisting essentially of hydroquinone residues, 4,4'-biphenol residues or a mixture thereof; and, optionally, (3) p-hydroxybenzoic acid residues. In the above definition, the moles of diol residues are equal to the moles of diacid residues and the total of the (1), (2) and (3) mole percentages is equal to 100. The liquid crystalline polyesters have melting points determined by differential scanning calorimetry equal to or less than 360.degree. C.

Abstract: This invention relates to a method of preparing a reinforced polyester composition comprising the steps of:I. mixing(a) at least one cyclic ester oligomer selected from the group consisting of ethylene terephthalate and cyclohexylenedimethylene terephthalate,(b) an organic initiator comprising one to five hydroxy groups which are capable of opening the cyclic ester rings,(c) a catalyst, and(d) a reinforcing material,II. heating the mixture of I at a temperature ranging from 270.degree. C. to 320.degree. C.

Abstract: Disclosed are polyesters composed of terephthalic acid, suberic acid and 1,4-cyclohexanedimethanol, wherein the suberic acid is within a critical range of 60 to 90 mole percent. These polyesters exhibit desirable adhesive properties.