DE2338710A1 - FIRE-COMBUSTIBLE MOLDING COMPOUNDS BASED ON POLYMERIZED PROPYLENE - Google Patents

Description

BASF Aktiengesellschaft 2338710

Our reference: O. Z. 30 O35 HWz / Be 6700 Ludwigshafen, JO.7.1973

Flame-resistant molding compounds based on propylene polymers

The present. The invention relates to flame-retardant molding compositions on the basis of

a) 100 parts by weight of a homopolymer of propylene or a copolymer of propylene, which is at least 50 percent by weight consists of polymer-bound propylene,

b) 0.5 to 9 parts by weight of an aliphatic bromohydrocarbon, which consists of at least 45 percent by weight chemically bound bromine,

c) 0.2 to 7 parts by weight of antimony trioxide,

d) 0.05 to 3 parts by weight of an organic phosphite and

e) 0.2 to 6 parts by weight of a mixture

e) 20 to 80 weight percent of a present at temperatures up to at least 100 ⁰ C in the solid state alkanepolyol having 4 to 12 carbon atoms and 4 to 12 hydroxyl groups and

e) 20 to 80 percent by weight of an oligomer of a diisopropylbenzene.

The known molding compounds of this type (see German Offenlegungsschrift and Auslegeschrift 1 79 ^ 072) have so far proven themselves well in practice. This also made it desirable to adapt the molding compounds to the practical requirements that have grown over the course of time, which, among other things, are aimed at good permanent workability even at higher and higher processing temperatures.

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O.Z. 30 035

It has been found that these requirements can be met if one in molding compositions of the type mentioned as Oligomer of a diisopropylbenzene (component e2) uses a special mixed oligomer of para and meta-diisopropylbenzene and in the molding compositions an additional component (component f) in the form of a specific metal salt mixture brings in.

The subject matter of the present invention are accordingly flame-retardant molding compounds based on

a) 100 parts by weight of a homopolymer of propylene or a copolymer of propylene which consists of at least 50 percent by weight of polymer-bound propylene,

b) 0.5 to 9 parts by weight of an aliphatic bromohydrocarbon, which consists of at least 45 percent by weight chemically bound bromine,

c) 0.2 to 7 parts by weight of antimony trioxide,

d) 0.05 to 3 parts by weight of an organic phosphite and

e) 0.2 to β parts by weight of a mixture

e) 20 to 80 weight percent of a present at temperatures up to at least 100 ⁰ C in the solid state alkanepolyol having 4 to 12 carbon atoms and 4 to 12 hydroxyl groups and

e) 20 to 80 percent by weight of an oligomer of a diisopropylbenzene.

The molding compositions according to the invention are characterized in that they contain

ο
e) as an oligomer of a diisopropylbenzene, a substance of

general formula

- 3 509807/1204

HC-CH

ΑΛ

CH,
t 3

CH

where η stands for a number from 3 to 30 (based on the "average molecular weight of the substance) and the points of attachment of the benzene rings with the aliphatic groups (on average) are 15 to 45 % para-position and 85 to 55 % meta-position, and as an additional component

f) 0.01 to 3 parts by weight of a mixture of 25 to 40 Weight percent barium laurate and 75 to 60 weight percent cadmium laurate.

As far as the non-characterizing components (a) to (d) and (e) are concerned in the case of such molding compositions, there is no need in the the present context, because for these components the same applies to the corresponding components in the German Offenlegungsschrift or Auslegeschrift 1 794 072 and British Patent 1,037,392 in general. It should be noted, however, that within the scope of the present invention Generally preferred as component (a) are homopolymers of propylene; as component (b) 1,2,5 * 6,9 * 10-hexabromocyclododecane; as component (d) often mixtures of two different phosphites, for example mixtures of Tris-nonylphenyl-phosphite and diphenyl-isooctyl-phosphite, im Weight ratio 1:10 to 15: 1; and as component (e) pentaerythritol.

The following can be said of the characteristic components of the new molding compositions: Component (e) is without difficulty available, e.g. from a corresponding mixture of the underlying diisopropylbenzenes (i.e. para- and meta-diisopropylbenzene mixture) by poly recombination reaction, as described in the work of V. V. Korshak and co-workers in "Polymer Science U.S.S.R.", Volume 1 (i960), pages 341 bis 350 and Volume 3 (1962), pages 925 to 935. - The sub-components of component (f) are commercially available

Fabrics. - 4 -

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% ffo

The molding compounds can be produced in the relevant customary manner, e.g. by bringing the components together closely by means of an extruder (suitable mixing temperatures: 170 to 180 ° C), the masses being immediately thereafter can bring into the desired shape, e.g. a granulate or a finished molded part.

In this connection it should also be mentioned that the low-flammability molding compositions in question, in addition to those according to the invention indispensable KomparEnten contain other relevant auxiliaries or additives in the usual amounts can, e.g. stabilizers, such as j5,5-di-tert.-butyl-4-hydroxyß-phenylpropionic acid stearyl ester, coloring substances, lubricants, antiblocking agents, minor amounts of others Polyolefins such as polyethylene and the like.

The molding compounds are suitable for the relevant usual areas of application, e.g. for the production of injection molded parts, pipes, fittings and plates for the construction sector.

example

A molding compound consisting of is produced in a conventional manner

a) 100 parts by weight of a homopolymer of propylene = 2.2),

b) 2.1 parts by weight 1,2,5,6,9,10-hexabromocyclododecane,

c) 1.1 parts by weight of antimony trioxide,

d) 0.7 parts by weight of tris-nonylphenyl-phosphite-diphenyl-isooctyl-phosphite mixture (Weight ratio 8: 1), *

e) 0.6 parts by weight of a mixture

e) 60 percent by weight of pentaerythritol and

formula

e) 40 percent by weight of a substance of the formula

509807 / 120A

? ^Η 3
ρ - 5 - ι η CH, O.Z. 30 035 t \ 17 ^CH 3 2338710 CH ^
HC- / -V
ι \ / CH ^ CH,
' ³ / "Λ
! \ / CH, CH
/ "\ _ 4η ³ CH ^ ^V - ^y CH, ^{X = a} ' ^ = ^ CH,

(where the index YJ is based on the average molecular weight of the substance) and the linking parts of the benzene rings with the aliphatic groups (on average) are 30% para-position acwfe 70 % meta-position, and

f) 0.3 parts by weight of a mixture of 33 percent by weight of barium laurate and 6 percent by weight of cadmium laurate.

0.2 parts by weight of 3> 5-di-tert-butyl-4-hydroxy-β-phenylpropionic acid stearyl ester can also be incorporated into the molding composition for particular stabilization.

The molding compound is made by injection molding at a melt temperature from 240 ° C a rectangular container with the dimensions 118 60 χ 40 mm was made (wall thickness; .2 mm); he behaves better than a corresponding container, for the production of which a comparable known molding compound is used.

509807/1204

Claims (1)

Claim Flame-resistant molding compounds based on a) 100 parts by weight of a homopolymer of propylene or a copolymer of propylene, which is at least 50 percent by weight consists of polymer-bound propylene, b) 0.5 to 9 parts by weight of an aliphatic bromohydrocarbon, which consists of at least 45 percent by weight chemically bound bromine, c) 0.2 to 7 parts by weight of antimony trioxide, d) 0.05 to 3 parts by weight of an organic phosphite, and e) 0.2 to 6 parts by weight of a mixture e) 20 to 80 weight percent of one at temperatures up to. at least 100 ⁰ C in the solid state present alkanepolyol having 4 to 12 carbon atoms and 4 to 12 hydroxyl groups and e) 20 to 80 percent by weight of an oligomer of a diisopropylbenzene, characterized in that they contain e) as an oligomer of a diisopropylbenzene a substance of the general formula * ~ ? ^H 3 -C CH, where η stands for a number from 3 to 30 (based on the mean molecular weight of the substance) and the linkage '- 7 -509807/1204 - 7 - O.Z. 30 055 represent the benzene rings with the aliphatic groups (on average) to 15 to 45 <fo para _T constantly and 85 to 55 % meta-permanent, and as an additional component f) 0.01 to 3 parts by weight of a mixture of 25 to 40 percent by weight Barium laurate and 75 to βθ percent by weight Cadmium laurate. ■ BASF Aktiengesellschaft 50 9 8 07/1204