Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1981-08-17
1983-10-18
Hoke, V. P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524112, 524114, 524127, 524172, 524139, 524236, 524285, 524341, 524371, 524375, 524377, 524416, 524469, C08K 553, C08K 552, C08K 541, C08K 515, C08K 513, C08K 509, C08K 506
Patent
active
044106483
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to organic high polymer compositions given a flame retarding property by an organic flame retardant and incombustible active inorganic powder, particularly organic high polymer compositions being greatly improved in flame retarding property.
BACKGROUND TECHNIQUE
Organic high polymers are readily made flame resistible by addition of an organic flame retardant and incombustible active inorganic powder. This method has been widely adopted in early stage for flame retarding organic high polymer substances (cf. U.S. Pat. Nos. 4,127,559; 4,132,748, etc).
As well known, it is supposed that an organic high polymer is decomposed by radical reactions at a high temperature on burning to low molecular weight combustible gases which serve as fuels for ignition and combustion of the high polymer, and at a higher temperature thereby, the generation of the decomposition gases is increased through chain reaction to continue the combustion.
The function of the flame retardant is extremely complicated, and its complete clarification is not yet attained. Supposedly, the organic flame retardant exerts an action to prevent the said chain reaction of combusting organic high polymers and an action to decrease the oxygen concentration in the atmosphere. Some of incombustible active inorganic powders act as an auxiliary for flame-resistivity, but they generally contribute to lowering the concentration of the combustible organic high polymer and, consequently, to reduce thereby the amount of the combustible gases to be generated by decomposition of the organic high polymer.
Even in the presence of such agents having the above mentioned activities, however, the decomposition rate of organic high polymers at a high temperature on burning and the generation of flammable gas can not be completely prevented. There is thus an limitation in the flame resistivity of organic high polymers by the use of these agents, and it is impossible by mere increase of the amount of such agents to obtain high degree flame resistivity of organic high polymers which is strongly required in recent years.
Under these circumstances, the present invention provides organic high polymer compositions being greatly improved in flame retarding property.
DISCLOSURE OF INVENTION
The present invention relates to an organic high polymer composition being greatly enhanced in flame retarding property which comprises a flame retarding composition containing (a) an organic high polymer, (b) an organic flame retardant and (c) incombustible active inorganic powder in a proportion of (a):(b):(c)=100:5-100:10-300 by weight and as supplemental components to be added thereto (d) a polyfunctional compound and (e) an organic compound represented by the formula: ##STR2## wherein Z is an oxygen atom or a sulfur atom, A is a substituted or unsubstituted C.sub.2 -C.sub.20 divalent hydrocarbon group forming a ring together with the adjacent two carbon atoms and the group B, and B is an oxygen atom or an imino group: --NY-- (Y being a hydrogen atom, a halogen atom or an organic group having not more than 30 carbon atoms) or its hydrolyzate, the amount of each of the supplemental components (d) and (e) being at least 0.05 part by weight to 100 parts by weight of the component (a).
In the present invention, it is essential to employ the components (d) and (e) in addition to the organic flame retardant as the component (b) and the incombustible active inorganic powder as the component (c) which have been conventionally employed. By the use of these supplemental components, the high degree flame resistivity of the component (a) can be realized.
As to the mechanism of the remarkable flame retarding effect by the use of the components (d) and (e), the present inventors have the following supposition, though it is not yet completely clarified.
As already mentioned, an organic high polymer is decomposed through a radical reaction at a high temperature to release low molecular weight combustible gas. The poly-functional compound as the compone
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Kato Hiroshi
Momose Chiaki
Dainichi-Nippon Cables Ltd.
Hoke V. P.
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