Polymer blends
A technology of blends and polymers, applied in the field of polymer blends, can solve problems such as unfavorable hydrolysis stability
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[0080] Linear polyesters can be prepared according to methods and conditions well known in the art for the preparation of polyesters. For example, heating one or more dicarboxylic acids (preferably aromatic dicarboxylic acids) or A mixture of its ester-forming derivatives and one or more diols. Typically, dicarboxylic acids or derivatives thereof are esterified or transesterified using diols at temperatures and atmospheric pressures at the lower end of a given range. Polycondensation is then carried out by increasing the temperature and reducing pressure while removing excess diol from the mixture. The preferred temperature for polyester condensation is from about 260 to about 300°C.
[0081] Typical catalysts or catalyst systems for polyester condensation are well known in the art. Catalysts such as those disclosed in US Pat. Nos. 4,025,492, 4,136,089, 4,176,224, 4,238,593, and 4,208,527, which are incorporated herein by reference, are believed to be suitable. In addition...
Embodiment 1-10
[0110] These examples demonstrate that phosphorus-containing catalyst quenchers are detrimental to the hydrolytic stability of polycarbonate-polyester blends, and that the hydrolytic stability of the blends is unexpectedly improved by the addition of HALS. In Examples 1-6, polyester A consisted of 74 mole % residues of terephthalic acid, 26 mole % residues of isophthalic acid and 100 mole % residues of 1,4-cyclohexanedimethanol , based on 100 mole percent of total diacid residues and 100 mole percent of total diol residues, polyester A has an intrinsic viscosity of about 0.74 dL / g and contains about 100 ppmw of titanium metal, and polycarbonate A is bis Phenol A polycarbonate (Makrolon 2608 supplied by Bayer Corporation). In Examples 1-6, a blend of polyester A and polycarbonate A (3:1 by weight) was combined with a phosphorus-containing stabilizer (a phosphite) under the trade name Doverphos 9228 and Chimassorb 944 Melt blended, Doverphos 9228 is pentaerythritol diphosphite ...
Embodiment 11-14
[0115] These examples demonstrate that the improvement in hydrolytic stability by the addition of HALS is independent of the method by which the HALS is introduced into the blend. A blend of polyester B and polycarbonate B (70:30 by weight) and a combination of Weston 619 (General Electric Specialty Chemicals) and Cyasorb UV-3529 (Cytec Industries, Inc) were melt blended. Precompounding additives with Polyester B at 250°C, 200 rpm using a 19 mm APV twin screw extruder at a rate of 5 lbs / hour to prepare the following masterbatch: Composed of Polyester B / Weston 619 (95 / 5) Masterbatch A, masterbatch B consisting of polyester B / Cyasorb UV-3529 (95 / 5) and masterbatch C consisting of polyester B / Weston 619 / Cyasorb UV-3529 (84 / 5 / 11). The blend was prepared as a 20 mil extruded cast film using a 1 inch Killion single screw extruder at 250°C and 70 rpm. The films were then conditioned for up to 6 weeks at 70°C and 100% relative humidity, and then the molecular weights of the polyester...
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