Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1989-01-18
1991-03-05
Jacobs, Lewis T.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
523205, 523451, 523506, 524416, 524868, C08K 332
Patent
active
049978764
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The present invention is concerned with a "flame-proofing" or "flame-retarding" composition for polymers, copolymers and blends of such polymers as polyolefins, polystyrenes, polyurethanes, etc., as well as thermosetting epoxy resins, polyesters, and the like.
An object of the invention are also the polymers, copolymers, polymeric mixtures and the thermosetting resins, as well as miscellaneous polymeric materials, such as paints, fabrics and the like, rendered self-extinguishing by means of said flame-retarding composition.
It is known that a generic polymeric material is made "self-extinguishing" or "flame-proof" or "flame-resistant" by means of the addition of particular "flame-proofing" or "flame-retarding" agents, which are precisely capable of endowing the polymeric substance with the required characteristics of self-extinguishment. Such flame-proofing agents are constituted by halogenated, usually brominated, organic substances, metal compounds (in particular oxides, such as, e.g., antimony trioxide), phosphorus and its derivatives (such as, e.g., red phosphorus, ammonium polyphosphate, organic phosphoric esters), miscellaneous nitrogen-containing compounds (such as, e.g., urea, dicyandiamide, melamine), and still others. It is known that in some cases, in order to reach the desired characteristics of self-extinguishment in a polymer, even two or more different flame-proofing compounds are used in association with each other, both in order to exploit, in combination, specific flame-proofing characteristics and/or "functions", and to accomplish determined particular "synergistic" or "combined" effects, and to avoid adding excessively high amounts on an individual flame-proofing agent, necessary to reach the desired level of self-extinguishment in the polymer, but which would involve an alteration or degradation of the same polymer, due to the typical characteristics of the flame-proofing agent used.
It is well known indeed that when a self-extinguishing polymeric material has to be accomplished by incorporating into it one or more flame-retarding agents, the amounts of said agents in the above-said material have to be limited as extensively as possible, in order not to appreciably alter the chemical-physical and mechanical characteristics of the same material.
It is furthermore known that a loss (escape) by extraction and/or dissolving of the flame-retarding agents added to said materials, and the "ageing" of said agents--in terms of a loss of flame-retarding power of the same agents as a function of time and/or particular chemical and/or physical factors of the surrounding environment--occurs.
Flame-retarding compositions of known type are those constituted by a hydroxyalkyl-derivative of isocyanuric acid, viz., a nitrogen-containing cyclic product, in particular tris-(2-hydroxyethyl)-isocyanurate, in association with other two components, viz., with a phosphorus-based product, such as ammonium polyphosphate, and another nitrogen-containing product, such as melamine, cyanuric acid, melamine salts, e.g., melamine cyanurate (European patent application No. 0204027 and U.S. Pat. No. 4,198,493). It can be seen that these are three-component flame-retarding compositions, based on phosphorus and nitrogen, suitable for being used in order to render self-extinguishing the polyolefinic and/or polystyrenic polymers.
A purpose of the present invention is to provide a flame-retarding composition constituted by two components only, which can be used in the necessary amounts and mutual ratios to reach the desired degree of self-extinguishment in the polymer, without phenomena occurring of alteration and/or degradation of the chemical-physical and mechanical characteristics of the polymer, due to the presence of several flame-proofing agents.
Another purpose of the present invention is to provide a flame-retarding composition for polymers, which is stable over time, and to the external environmental agents, and which, therefore, does not give rise to losses due to the extraction and/or dissolving of th
REFERENCES:
patent: 4198493 (1980-04-01), Marciandi
patent: 4727102 (1988-02-01), Scarso
patent: 4772642 (1988-09-01), Staendeke
Jacobs Lewis T.
V.A.M.P. S.r.l.
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