Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1995-08-03
1998-08-18
Hoke, Veronica P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524 96, 524416, 524430, 524437, C08K 904, C08K 3492
Patent
active
057959307
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a thermoplastic polymer composition showing excellent flame retardance, more particularly to a thermoplastic polymer composition of high flame retardance which comprises (A) an oxygen-containing solid compound containing an element of Group II, Group III or Group IV of the periodic table, (B) a nitrogen-containing organic compound, (C1) an ammonium polyphosphate powder or (C2) a melamine-coated ammonium polyphosphate powder and (D) a thermoplastic polymer, in specific amounts.
The present invention also relates to compositions of thermoplastic polymers (B), which contain, in place of the component (C1) or (C2) of the above-mentioned composition, a water-insoluble ammonium polyphosphate powder obtained by altering the structure of a coat of the melamine-coated ammonium polyphosphate (C2) to crosslinked structure, and which are almost free from bleeding phenomenon even when exposed to an atmosphere of high temperature and high humidity and shows satisfactory flame retardance.
Furthermore, the invention relates to thermoplastic resin compositions which are formed from at least the water-insoluble ammonium polyphosphate powder mentioned above, (B) nitrogen-containing organic compounds and (D) thermoplastic resins and which are excellent in bleed resistance and flame retardance.
Moreover, the invention relates to the water-insoluble ammonium polyphosphate powders mentioned above (at least one kind selected from C3, C4 and C5) and processes for preparing the same.
BACKGROUND ART
Thermoplastic polymers have been heretofore used in various fields such as fields of industrial and domestic electrical appliances, architecture, house furnishings, automobile parts, etc., because they are advantageous in sanitary viewpoint, processability, chemical resistance, weathering resistance, electrical properties and mechanical strength. Moreover, the use application of the thermoplastic polymers has been extended. With extension of their use application, flame retardance has been required for the thermoplastic polymers, and such requirement becomes severer and severer. Especially in recent years, it is regarded as a problem that a flame-retardant resin composition obtained by adding a halogen-containing compound to a thermoplastic polymer or a flame-retardant resin composition obtained by adding a halogen-containing compound and antimony oxide to a thermoplastic polymer, which are the mainstream of the flame retarding technique conventionally used, generate halogenous gas when they are burned or molded. Therefore, a flame-retardant resin composition which generates no halogenous gas during burning or molding has been demanded.
To meet such demand, in recent studies, there has been proposed a method of adding, as an inorganic flame retardant, a specific metallic hydrate which is decomposed or dehydrated by the endothermic reaction at the combustion temperature of the resin to inhibit combustion of the resin. In this case, however, the flame retardance effect of the metallic hydrate is extremely low, so that the metallic hydrate must be used in a large amount to obtain a desired flame-retardant resin composition. As a result, the resulting composition is reduced in the molding processability, and besides, the molded article obtained therefrom is deteriorated in various properties such as mechanical strength. In order to cope with various problems caused by the use of the metallic hydrate in a large amount, it has been proposed to further add an inorganic compound.
For example, there are proposed the addition of molybdenum or a molybdenum compound (Japanese Patent Laid-Open Publication No. 268738/1989) and the addition of silicon carbide whisker (Japanese Patent Laid-Open Publication No. 9937/1991). However, even if an inorganic compound is further added to the flame-retardant resin composition containing metallic hydrate as a main flame retardant, new problems caused by the use of a large amount of a flame retardant arise, and the problems have not been fundamentally solved yet
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Fukumura Tikashi
Inoue Kouji
Iwata Masuo
Narita Noriaki
Seki Mika
Chisso Corporation
Hoke Veronica P.
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