Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1999-05-12
2000-07-04
Sanders, Kriellion
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524296, 524311, 524414, 524451, 524472, 524488, C08K 500, C08K 509, C08K 510
Patent
active
060840129
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to thermoplastic molding compositions comprising group consisting of polyamides, polyesters, polyphenylene ethers and mixtures of these, from 0.01 to 2% by weight, based on 100% by weight of B), of a phlegmatizer and from 2 to 15% by weight of a mineral filler,
The invention also relates to the use of the novel molding compositions for producing fibers, films and shaped articles, and to the resultant shaped articles.
During the incorporation of red phosphorus into polymer melts, safety problems arise because of dust formation and phosphine development.
DE-A 27 03 052 discloses flame-retardant thermoplastic molding compositions in which red phosphorus was stabilized by adding aluminum salts, or magnesium salts, of ethylenediaminetetraacetic acid (EDTA) or nitrilotriacetic acid (NTA).
The metal ions, however, bring about a worsening of the electrical properties of the plastic moldings which restricts their range of application.
EP-A 71 788 discloses polyamide molding compositions in which the red phosphorus is coated, before incorporation, with binder resins derived from phenol and isobutyraldehyde or cyclohexanone.
DE-A 27 45 076 discloses other phenol-formaldehyde binder resins as materials for coating phosphorus.
When phosphorus which has been pretreated in this way is incorporated into the polymer melt, the binder resins are degraded to some extent. The formaldehyde thus formed reacts with the thermoplastics, giving rise to a general deterioration in the mechanical properties of the shaped articles which can be produced from them.
In addition, DE-A 24 08 488 discloses wax and wax-like substances as binder for red phosphorus.
DE-A 26 25 674 discloses, furthermore, epoxy-containing compounds as binder resins for red phosphorus.
These binder resins are, however, poorly compatible with the thermoplastics, so that incorporation is made more difficult (agglomeration), and the low adhesion leads to a deterioration in the mechanical properties of the shaped articles which can be produced from them.
EP-A 176 836 and EP-A 384 232, furthermore, disclose polyurethanes and polyester-polyurethanes, and organic phlegmatizers which can be emulsified in water, such as dioctyl phthalate, for coating phosphorus.
DE-A 25 51 718, inter alia, discloses mineral fillers as additives in flame-retardant polyamides.
It is an object of the present invention to provide readily obtainable flame-retardant thermoplastic polyamide molding compositions and polyester molding compositions which have good flame retardancy with good mechanical properties, and also to ensure, to a sufficient extent, the thermal stability of the flame-retardant phosphorus mixture which is employed.
We have found that this object is achieved by means of the flame-retardant molding compositions defined at the outset.
Preferred molding compositions of this type, together with a method for their use, are described in the subclaims.
Surprisingly, a combination of phlegmatizer with a mineral filler gives not only stable phlegmatized phosphorus but also improved flame retardancy, so that shaped articles with very low wall thicknesses show very good flame-retardant properties and high phosphorus stability.
The novel molding compositions include, as component (A), from 5 to 99% by weight, preferably from 20 to 90% by weight, and in particular from 20 to 80% by weight, of a thermoplastic polyamide or polyester or polyphenylene ether or mixtures of these. Polyesters which are used are generally based on aromatic dicarboxylic acids and an aliphatic or aromatic dihydroxy compound.
A first group of preferred polyesters consists of polyalkylene terephthalates having from 2 to 10 carbon atoms in the alcohol moiety.
Polyalkylene terephthalates of this type are known per se and are described in the literature. They contain, in their main chain, an aromatic ring which derives from the aromatic dicarboxylic acid. The aromatic ring may also be substituted, for example with halogen, such as chlorine or bromine, or with C.sub.1 -C.sub.4 -alkyl, such as
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Database WPI, Se. Ch., Week 8711, AN87-075455, XP 002060327.
Gareiss Brigitte
Gorrissen Heiner
Klatt Martin
BASF - Aktiengesellschaft
Sanders Kriellion
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