Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Process of treating scrap or waste product containing solid...
Patent
1996-11-25
1999-01-12
Hoke, Veronica P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Process of treating scrap or waste product containing solid...
524151, 524604, 525438, C08J 1104
Patent
active
058590730
DESCRIPTION:
BRIEF SUMMARY
The invention relates to polyester/polycarbonate blends having enhanced properties as well as to a process for enhancing the properties of polyester/polycarbonate blends.
Polyester/polycarbonate blends (PES/PC) such as polybutylene terephthalate/PC blends (PBT/PC) or polyethylene terephthalate/polycarbonate blends (PET/PC), or ternary blends such as PBT/PC/ABS, are important engineering plastics. These blends unite the properties of the starting polymers, such as high impact strength at room temperature and at low temperature, high rigidity, low susceptibility to stress-cracking, good resistance to chemicals, in particular to fuel, and easy coatability. Because of these properties, PBT/PC blends are preferably used for lacquered parts of large dimensions, for example in the automotive industry for the production of car bumpers. Since the production of these parts demand relatively long cycle times at elevated temperature, efficient processing stabilisation is essential.
The mechanical and physical properties of these blends furthermore depend essentially on the molecular weight of the polymer. During processing and use, however, the PES/PC blends are often damaged, resulting in reduced molecular weight. High-quality recycling of used PES/PC blends and of production waste therefore requires an increase of the molecular weight.
Accordingly, it is the object of the present invention to provide PES/PC blends, more particularly PBT/PC recyclates, having enhanced properties. In this context, enhancing the properties will be taken to mean in particular enhancing the processing stability and/or increasing the molecular weight. The increase of the molecular weight may relate either to a single component of the blend or to both or several components of the blend simultaneously.
Surprisingly, it has been found that a mixture of at least one metal oxide or metal salt of a fatty acid, either in combination with a phosphite and a sterically hindered phenol or in combination with a difunctional epoxy resin, substantially enhances the properties of the blend.
Accordingly, the invention relates to a PES/PC blend comprising phenol, or
In particular, the present invention relates to PES/PC blend recyclates, more particularly to PBT/PC or PET/PC and, very particularly, to PBT/PC recyclates. Such recyclates originate, for example, industrial waste or useful material collections, production wastes or obligatory returnables. These recyclates may be obtained, for example, already as blend (for example in the case of car bumper materials), but may also be used as separate polymers for the preparation of the recyclate blend (e.g. PET from bottles and PC from rib-enforced sandwich panels of roof linings, or e.g. from returnable bottles. The recyclates may in particular be recyclates from car bumpers.
Furthermore, according to this invention only one component of the blend can be in the form of scrap material, for example PET bottle recyclate in combination with PC virgin material.
In a preferred embodiment of the invention, the polyester/polycarbonate blend comprises in addition to a) also b.sub.1) and b.sub.2).
The polyesters may be homopolyesters or copolyesters that are derived from aliphatic, cycloaliphatic or aromatic dicarboxylic acids and diols or hydroxycarboxylic acids.
The aliphatic dicarboxylic acids may contain from 2 to 40 carbon atoms, the cycloaliphatic dicarboxylic acids from 6 to 10 carbon atoms, the aromatic dicarboxylic acids from 8 to 14 carbon atoms, the aliphatic hydroxycarboxylic acids from 2 to 12 carbon atoms, and the aromatic as well as the cycloaliphatic hydroxycarboxylic acids from 7 to 14 carbon atoms.
The aliphatic diols may contain from 2 to 12 carbon atoms, the cycloaliphatic diols from 5 to 8 carbon atoms and the aromatic diols from 6 to 16 carbon atoms.
Aromatic diols will be taken to mean those in which two hydroxyl groups are bonded to one aromatic hydrocarbon radical or to different aromatic hydrocarbon radicals.
The polyesters may also be branched with minor amounts, typically 0.1 to 3 mol %, ba
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Herbst Heinz
Hoffmann Kurt
Pfaendner Rudolf
Ciba Specialty Chemicals Corportation
Hall Luther A. R.
Hoke Veronica P.
Kovaleski Michele A.
Levine Jacob M
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