DE1720387A1 - Flame-retardant synthetic resin compounds - Google Patents

Description

CHEMISCHE WERKE ALBERT, Wlesbaden-Biebrich, Albertstrasse 10-14 Flame-retardant synthetic resin compounds

The invention relates to flame-retardant synthetic resin compositions based on A) one or more curable synthetic resins of the groups a) epoxy resins, b) condensation products in the form of phenolic, amine resins and polyesters and B) mineral fillers, optionally hardeners and other customary additives.

From the German Auslegeschrift 1 173 641 it is known red Mixing phosphorus into polyurethanes as a flame retardant. However, this process is limited to the production of foams. In addition, because of their porous structure, these foams are not suitable for every application. You let yourself however, do not use it for high-quality electrical insulating material, which has high resistance values and at the same time high resistance to embers are required.

It is also known to produce synthetic resin compositions using curable synthetic resins which also contain fillers, for example mineral fillers such as asbestos, rock flour, silica or the like, and optionally hardeners for the synthetic resins. The properties of the hardened objects made from these known synthetic resins do not always meet the increased requirements with regard to the flame retardant properties of the products made from them, as is necessary when using such compounds, for example for certain applications for electrotechnical purposes is. Insulating bodies , such as those used for example in electrical switchgear, should have good electrical properties, such as good tracking resistance and resistance to arcing, in particular a high level of glow resistance and develop as little soot and no flammable gases as possible at high temperatures. Halogenate by adding common halogen compounds such as tetrabromic or tetrachlorophthalic acid or others

New documents (Art.? _S ι au ,, k ι . _R. Ι sentence 3 dea am _e rum _8fle3 ν, " ² "

10 98 25/1973

ρ, ΛΓ) ORiG

Phthalic acid compounds or dibromosuccinic acid as flame retardant Substances, however, especially at high voltages, do not achieve a sufficiently high creepage resistance. These substances can sometimes form flammable gases, even at high temperatures, which can easily ignite on contact with an open flame. aside from that Such halogen compounds can lead to corrosion of metal parts that are in contact with the hardened molded parts Standing touch.

These difficulties are overcome by the present invention

Artificial narcotics

be careful by providing that the / red phosphorus is in a proportion of up to 25% by weight, based on the total mixture. The synthetic resin compositions according to the invention enable production of solid, hardened masses, moldings or components, which are characterized by their surprisingly high flame retardancy and characterized by very good electrical properties. The synthetic resin compositions expediently contain the red phosphorus in an amount up to 25 percent by weight, based on the total mixture.

In particular, inorganic oxide, carbonate or boron compounds can be used as mineral fillers. Suitable fillers are for example silica, such as kieselguhr, quartz powder, calcium borate, calcium carbonate, aluminum oxide hydrate, antimony oxide, but also glass powder, alkaline earth silicates or the like.

When using the flame-retardant synthetic resin compounds for electrotechnical For this purpose it is important to note that even in the heat they practically do not cause any hull formation and must not form any flammable gases. As a rule, therefore, no sulfur- or halogen-containing or organic substances or carbon black will be used as fillers.

The fillers can be added to the mixture in a proportion of at least 50 to about 400, preferably 150 to 350 percent by weight, based on the resin. The proportion of fillers depends on the respective properties of the used Resin components, for example according to their viscosity

1 0 9 8 2 5/1 9 7 3 bad original - 3 -

■ ■ - 3 -:

and according to the desired properties of the synthetic resin compositions cured masses produced, for example molded articles, and their intended use. Usually one will Mix in fillers in relatively finely divided form in order to achieve the most homogeneous masses possible and thus flawless surfaces to achieve the body made from it. It is also possible to use the fillers in combination with one another, or to coordinate the filler components with one another, to achieve particularly good effects. The use of a filler mixture consisting of quartz powder and calcium borate, which optionally contains additional fillers, is particularly advantageous. Surprisingly, this combination results phosphorus, calcium borate and quartz powder significantly improve the flame retardancy in an open flame; In addition, the formation of soot is completely suppressed.

"The basis for the synthetic resin compounds are various curable ones Synthetic resins, optionally individually or in a mixture, suitable, for example amine resins such as melamine resins, urea resins, Phenolic resins, but preferably epoxy resins based on aromatic, aliphatic or cycloaliphatic glycidyl ethers and unsaturated polyester resins of the most varied types, which can also be largely modified.

As a rule, when using epoxy resins, the usual ^ epoxy resin types are used based on polyhydric phenols, for example diphenylolalkanes, such as diphenylolpropane, diphenylolmethane and epichlorohydrin, but also epoxy resins on the

al i Banis of polyvalent aliphatic or cyclophatic alcohols. Instead of / or together with the epoxy resin, it is also possible to use unsaturated polyester resins, for example based on phthalic acid, maleic acid and polyhydric alcohols, or any known modifications of the unsaturated polyester according to the invention. When using epoxy resins, it is possible to additionally use reactive diluents, for example isononyl glycidyl ether, 2-ethylhexyl glycidyl ether, trimethylhexyl glycidyl ether, tricyclodecane methyloluric i-d methylol glycidyl ether or the like.

10 9875 / 1q? ^ - 4 -

BATH ORIGINAL

This can increase the plasticity of the synthetic resin compounds. If polyester resins are used, it may be desirable instead of these glycidyl ethers used in epoxy resins Vinyl monomers, for example vinyl toluene, styrene or the like, to mix in as a solvent for the polyester. One will make use of this possibility above all, if the synthetic resins used are relatively highly viscous are.

In order to achieve perfect solidification of the synthetic resin compositions when they are used, it is expedient that they also hardeners for the synthetic resins used and, if necessary, other known additives such as accelerators or the like. As a rule, one will proceed in such a way that the phosphorus is first mixed with the fillers. Be on it the fillers are added to the resin or to the mixture of resin and hot hardener. When using cold hardeners, these are e.g. only added immediately before the desired hardening time, the hardeners for the epoxy resin components are the common known hot or cold hardeners, e.g. polycarboxylic acid anhydrides, Amine compounds, such as polyamines, in each case individually or in a mixture with one another, or containing polycarboxylic acid anhydrides or separating compounds are suitable. The acid anhydrides known per se, for example Maleic anhydride, dodecylsuccinic anhydride, hexahydrophthalic anhydride, endomethylenetetrahydrophthalic anhydride, Alkenyl carboxylic anhydrides, for example isooctenyl succinic anhydride, use individually or in a mixture. It is also possible to add amine compounds use, for example, tertiary amines, such as aniline derivatives, for example p-alkyldimethylaniline or the like. If the molding compounds are intended for cold curing, njan is preferred Polyamines, for example diethylenetriamine, xylylenediamines or the like, use as hardeners.

As hardeners for synthetic resin compositions containing polyester, the usual peroxide compounds suitable, for example benzoyl peroxide, Dichlorobenzoyl peroxide, lauryl peroxide, tertiary butyl peroxide, tert-butyl perbenzoate, methyl ethyl ketone peroxide / ^ cyclohexanone peroxide or similar. Depending on the structure of the synthetic resin and the "ηοοοπ / ιοτο, ν

109825/1973 bad original ^]

The hardener content can be used within the usual limits vary.

As a rule, you will use the usual quantities for heat curing, for example 1 Mo ^ ioarboxylic anhydride per epoxy group, use. The usual amount is also used for cold hardening, usually a small excess of 1 / mln hydrogen atoms per epoxy group. The peroxy compounds used to cure the polyester can be used, for example, in .an amount of 1 to 2 percent by weight, based on the amount of polyester, use.

The cured synthetic resin compositions according to the invention are distinguished by their surprising glow resistance and their self-releasing properties. Furthermore, the cured synthetic resin compositions have very good electrical properties, for example high arc resistance combined with high volume resistance, good dielectric strength and high tracking resistance. In contrast to such flame-retardant compounds, which were produced by adding chlorine or bromine compounds; the compositions according to the invention show no smoke and soot formation after their hardening when treated with an open flame. In addition, no flammable gases are formed during decomposition Due to these special properties of the hardened masses, they are suitable for the production of masses, components, castings and / or moldings, coatings and impregnations, which are used in particular for purposes in which the body is exposed to high thermal and electrical stresses They are eminently suitable, for example, as electrical insulating material, for the production of switches, insulators, housings, dielectric layers, base plates for printed circuits or the like, and plastic mixtures produced according to the invention are also suitable for the production of paints ln and coatings. The cold-hardening mixtures are also used for the production of

. 109825/1973 '_ ₆ _ bad

and cladding, for example for components, can be used. at These applications also benefit from the favorable mechanical properties of the cured products made from these compositions come into play. .

example 1

250 g of an unsaturated polyester, made from 25 Μοίίυ terephthalic acid, 25 mol # maleic anhydride and 50 Μσ1 # propylene glycol - 1.2 according to the melt condensation process, were mixed with 5 g of red, finely ground phosphorus stabilized with a small amount of metal oxide, for example iron oxide, mixed 10 g of diallyl phthalate, 10 g zinc stearate, 8 g of dibenzoyl peroxide (50 $ solution in dibutyl phthalate) dry, 217 g of ground limestone and 500 grams of ground kaolin in an unheated Doppelmuldenkneter and then plasticized on a heated roll mill at 70 ° to 9O ⁰ C and homogenized . The mixture was allowed to solidify at room temperature. Then it was granulated in a cross beater mill. The granules became

on a press at 140 ° C and 140kg / cm within 20 seconds Bars a) according to DIN 5.3 48θ and b) according to VDE 03 202 / lII-4T> manufactured.

The following properties were determined in the test specimens:

2 2

Flexural strength 750 kg / cm, impact strength 5 kg . cm / cm,

Notched impact strength 3 »5 kg. cm / cm, dimensional stability according to Martens 110 ^° C., water absorption (DIN 53 472) 20 mg. The processing shrinkage was 0.5 %

In addition, the electrical properties of the test specimens were determined from the synthetic resin compositions according to the invention. The tracking resistance (DIN 53 480) corresponded to level KA 3 c '. The surface resistance (DIN 53 482) was 13/13 before and after the treatment. The volume resistance was 5 ", 10 ^ ohm-cm tan £ - 0.008, the dielectric strength was over 100 kV / cm.

The flame resistance was tested according to ASTM D 757-49. A thermally treated test specimen was extinguished after 10 seconds. The synthetic resin compound is therefore considered "non- flammable" ν ■■ &% * embers? - - ^ i strength was carried out according to the above-mentioned VDE regulation. It corresponded to quality grade 4. This was the

109825/1973 - 7 -

BAD OR'GiMAL

Weight loss 70 mg and the spread of the flame 0.5 cm.

λna löge results were determined on test specimens that were immediately from the homogenized mixture, i.e. without prior granulation, have been produced.

Comparative experiment to Example 1 .

The same test specimens were produced as in Example 1 from the same synthetic resin composition, but without the use of Phosphorus. When measuring the flame resistance, the test specimens extinguished after 60 seconds. They are therefore considered to be "self-extinguishing". The glow resistance resulted in grade 3 the weight loss contributed 500 mg and the spread of the flame .2.2 cm.

The synthetic resin compositions according to the invention are therefore synthetic resin compositions superior in terms of their flame-retardant properties without the addition of phosphorus.

Example 2

400 g of a styrene-containing unsaturated polyester, consisting of 20 mol % phthalic anhydride, 30 mol % maleic anhydride, 50 mol % propylene glycol-1,2 and with a styrene content of 30 percent by weight were treated with 50 g of red, finely ground · stabilized phosphorus, 10 g of tert Butyl perbenzoate, 10 g zinc stearate, 50 g magnesium oxide and 200 g ground limestone are mixed in an unheated mixer until a paste is formed. Then 300 g of volanized, that is to say treated with methacrylic chromium chloride, staple glass fibers (length 6 mm) were added to the mixture. The mixture was solidified at room temperature and then processed as in Example 1 to give test specimens.

The examination of the body revealed the following properties:

■ 'P P

Flexural strength 900 kg / cm, impact strength 26 kg. cm / cm, notched impact strength 26 kg. cm / cm, heat resistance

- 8 109825/1973

Γ / 20387

according to Martens 135 ⁰ C, Wnsseraufnähme 6θ mg. The processing draft was 0.3 %.

The tracking resistance corresponded to level K A 3 c. Of the Surface resistivity was 12/12 versus 13/13 before treatment. Volume resistivity was

5. 10 ohms. cm, tan f> - 0.010, the dielectric strength was over 130 kV / cm.

The flame resistance had the result "non-flammable". One The sample was not ignited during thermal treatment with an open flame. The glow resistance according to that mentioned in Example 1 VDE regulation corresponded to quality grade 4. The was Weight loss 110 mg and the spread of the flame 0.7 cm.

Comparative experiment to example 2

The same samples were produced as in Example 2, but without the addition of phosphorus. The test of flame retardancy had the result "flammable". The glow resistance corresponded grade 2 with a weight loss of 700 mg and a flame spread of 2, B cm.

Example 3

28.25 g of an epoxy resin based on diphenylolpropane and Epichlorohydrin with an epoxy equivalent weight of about 200 were mixed with 4.25 g of a melted mixture of m-

Gawionts-phenylenediamine and m-toluenediamine (im / 2: deceived Dgut and 2.7 g of red, finely ground and stabilized phosphor, 10, Pi g ground limestone, 27 g of ground kaolin, 0.9 g of zinc stearate and 26 , 1 g staple glass fibers (length

6 mnrH ^ mixed in a double bowl mixer at about 40 ° C. That Mixture was mixed in a thin layer until the resin solidified through progressive polymerization at room temperature stored and then in a cross beater mill

-Q- - {) that have been pretreated with Silnnen Find

10 9 8 2 5/1973 BAD ORiGlNAL

granulated. The fibrous granules were in a press case 165 ° C and processed into rods as in Example 1 within 5 minutes.

> .n the test specimens i were compiled in the following table Properties determined: The glow resistance corresponded the quality grade 4, with the weight loss QO mg and the Spread of the flame was 0.6 cm

Comparative experiment to example 3

The same test specimens were used as in Example 3 from the same Synthetic resin compound, but made without the addition of red phosphorus. These determined properties are in the following compiled in the table. The glow resistance corresponded grade 2, with the weight loss βΟΟ mg and the spread the flame was 3.0 cm.

to OD K)

Example 3 Comparative experiment
to example 3 ο
Flexural strength kg / cm 1054 798 2
Impact strength kg.cm/cm 19th 19th 2
Notched impact strength kg.cm/cm 15th 17th Dimensional stability ° C 139 I4o Surface resistance VZ 13th '13 Specific Passage Disease 2.8.1O ¹⁴ 1.4.10 ¹⁴ The loss factor tan i 0.026 0.025 Dielectric strength kV / cm > 124 > 124 Tracking resistance level KJl 3 ο K Λ ^v ; C. Ember resistance quality grade 4th 2 Water intake mg 14th 11
BAD ORIGI ^

As the comparison of the values shows, the addition of phosphorus significantly increases the resistance to embers. However, the good electrical and mechanical values resulting from the respective synthetic resin are retained. It should be particularly emphasized that the flame-retardant additives do not provide the tracking resistance, which is important for electrical engineering affect. , Also, the water absorption and the Flexural strength increased. The molding compositions according to the invention are therefore in particular with regard to the molding compositions without phosphorus superior to their electrical and flame-retardant properties.

Example 4

A mixture of 100 g of an epoxy resin made from diphenylolpropane and epichlorohydrin with an epoxy equivalent of 182 to 194 and 80 g of hexahydrophthalic anhydride was dissolved in the heat and mixed with a mixture of 54 g of calcium borate, 225 g of quartz flour and 20.9 g of red phosphorus. The homogenized mixture was then poured into molds and hardened within 10 to 15 hours at a temperature of 14o to 18o ° C to form standard bars or plates according to DIN 16946. The glow resistance of the bodies corresponded to quality grade 4. These bodies showed flexural strength from 78? kg / cm, a dimensional stability by Martens of 115 ⁰ C, a surface resistance (DIN 53482) of 12/12 against a value of 15/13 prior to treatment.

Furthermore, the electrical properties of test bodies determined from the plastic mixtures according to DIN 16 $ 46. The ~ -

14 specific volume resistance was 3.1. 10 ohms. cm, tarn ^ = 0.007, the dielectric strength was over 120 kV / cm, and the tracking resistance corresponded to level KA 3 c. The flammability of the plastic mixtures was determined according to the Hammerl test (Lyth Annual Technical and Management conference Reinforced Plastic Division, February 1962, Chicago Section 12 H, pages 1 to 6) by measuring the arc resistance (ASTM D 495-61) and the so-called flame test determined. The arc resistance corresponded to level 4. The Hammer1 test gave a value of 100 points,

BAD ORfGiNAt 11 - ·

109825/1973

■ ■ ■ ■ - αϊ -

the

The above values leave / very good electrical properties the hardened body from the invention Recognize synthetic resin compounds.

The flame test was carried out as follows: The bodies were Held in a bunsen flame for 15 seconds. After removing it from the flame, the body must be within 15 Seconds without the formation of flammable gases or soot go out. The body then takes another 45 seconds held in the flame. After taking it out, it has to be returned go out within 15 seconds.

The test specimens according to Example 4 extinguished just 1 second after heating in the first stage. After the second treatment stage a, the samples were quenched within 4 seconds.

1. Comparative experiment to Example 4

The same epoxy resin-hardener mixture was used as in Example 4, but produced without the addition of phosphorus. A mixture of 225 g of powdered quartz and 54 g of calcium borate was introduced into this mixture. In the flame test, test specimens made from this mixture showed a considerably better behavior than those made from inventive masses. After the first stage of treatment, the sample extinguished after 6 seconds. However, after the second treatment stage, the sample no longer extinguished. Also educated 25 seconds after the second treatment, flammable gases and development of soot occurred. · ™

2. Comparative experiment to Example 4

It was with the same mixture as in Example 4,> however worked with 279 g of quartz flour and without calcium borate. Test specimen from this mixture extinguished in a flame test first treatment stage after 10 seconds with soot formation the second stage of treatment was severe after 20 seconds Soot and the sample no longer went out.

In connection with Example 4, the comparative experiments show the surprising synergistic effect of the flame-retardant

- 1? 109825/1973

BATH ORIGINAL

- Xd -

Properties with the simultaneous use of a combination of phosphorus, quartz powder and calcium boron in the mixtures. While after the two comparative tests the samples did not go out in the second stage of the flame test, samples did -us the synthetic resin compositions according to the invention in the second treatment stage a deletion after 4 seconds.

Example 5

100 parts by weight of the epoxy resin used in Example 4 were mixed with 80 parts of hexahydrophthalic anhydride, and the mixture was dissolved with heating. A mixture consisting of 279 g of ouarz flour and 20.9 g of red phosphorus was then introduced into this solution. The mass was homogenized, filled it in molds and cured for 20 hours under heating to I ₁ ⁰ C O. The properties of the test specimens were tested as in Example 4. The following values were found: Volume resistance 1.8. 10 ohms. cm, tan <j 0.012, dielectric strength over 120 kV / om, leakage current capability = level K P- 3 c. The arc resistance corresponded to level 4. The surface resistance was 12/12 in the treated and I3 / I3 in the untreated state.

After the flame test, the specimens extinguished after the first treatment stage after 1 second, after the second stage afterwards 14 seconds.

Example 6

A mixture of epoxy resin and hexahydrophthalic anhydride that was prepared and dissolved as in Example 4, with a filler mixture consisting of 53 »7 g calcium borate, 214 g Quartz flour, 10.45 g of antimony oxide and 20.9 g of red phosphorus were added. The mixture was then homogenized and then Cured at 170 ° C for 20 hours. The following test values were obtained

14 determined: Specific volume resistance 3.1. 10 ohms. cm, tan j 0.013, dielectric strength over 120 kV / cm, tracking resistance Level K A 3 c.

In the flame test, the specimens went out after the first Treatment level after 4 seconds, after, the second level afterwards

10982S / 1973 - 13 -

BAD ORiGiNAL

Ί / 20387

■ 3 seconds. The arc resistance corresponded to level 4.

Example 7

At the same epoxy resin hardener solution as in Example 4, a mixture of 54 g of calcium borate, 214 g of quartz powder, 20.9 g of red phosphorus and 10.5 g of alumina hydrate added, the mixture then poured into molds and 20 hours at 17O ⁰ C hardened.

E-s, the following test values were determined: Specific diameter

14 ι

input / resistance 3. 10 ohms. cm, tan 6 O.öl ?, dielectric strength over 116 kV / em, tracking resistance level KA 3 c, ^ arc resistance level 4. *

After the flame test, the specimens extinguished after the first treatment stage after 2 seconds, after the second stage afterwards 2 seconds.

Example ^g i . '■

A mixture of 100 g of the lipoxide resin used in Example 4 and 19.7 g of a mixture of m- and p-xylylenediamine was dissolved by melting. A mixture consisting of 40 g calcium borate, 120 g quartz flour and 14.4 g red phosphorus was added to this solution. The mixture, the mixture _ vmrde it, poured into molds and 8 hours at 20 ⁰ C allowed to stand ". Then v / urde further 4 hours at 100 ⁰ C fully cured.

After the first and second treatment stage, the test specimens extinguished immediately after the flame test.

lie lsplel 9

Kn'wurde a mixture of 20 g of a 70% solution of a Polyester, consisting of 1 mole each of maleic acid and phthalic acid and 2 moles of ethylene glycol, in styrene and from 0.2 g of one 50% benzene peroxide paste in methyl phthalate, produced, A mixture of 20 g of calcium borate and

109825/1973 _ψ _

BATH

i / 20387

Stir in 2.4 g of red phosphorus. The homogenised solution is then poured into molds and 2 to 4 hours at 10O ⁰ C .Husgehärtet.

üeLsplel 10

20 g of the same polyester solution as in Example 9 were at room temperature with 0.2 g of 50% benzoyl peroxide paste added in dimethyl phthalate and / the solution at room temperature a mixture of 9 * 6 g of aluminum oxide hydrate and 2.4 g of red Phosphorus introduced. Further processing was carried out as in the previous example.

Example 11

20 g of the polyester solution according to Example 9 were 0.2 g 50 # benzoyl peroxide paste added to dimethyl phthalate. A mixture consisting of 50 g of Cr.lciumborr.t and 2.4 g of red phosphorus, stirred into the mixture and the mixture is homogenized. The further processing took place as in example 9.

The test specimens produced according to Examples 9 to H. were heated in a strong bunsen flame for 15 seconds. It went out when it was removed from the flame file samples immediately.

BAO ORIGINAL

109825/1973

Austria 4771/68 1/20387

Example 12

400 g of a novolak resin, which consists of phenol and formaldehyde in one Molar ratio of 1: 0.7 was made with 60 g Hexamethylenetetramine, 240 g wood flour (soft type) 210 g coconut shell flour, 60 g limestone, 10 g magnesium oxide, 10 g lacquer black extra, 10 g zinc stearate and 20 g red phosphorus, stabilized, as indicated in Example 1, prepared, pressed into test specimens and tested.

The following table was used on the test specimens Adjectives determined. The glow resistance corresponded to quality grade 4, the weight loss due to burning 50 mg and the spread of the flame was 0.4 cm.

Comparative experiment to example 12

The same synthetic resin composition as in Example 12, but without an additive of phosphorus, was processed as stated there and the properties were tested. The values determined are in the following Table compiled. The glow resistance corresponded to quality grade 3, the weight loss due to burning being 170 mg and the flame spread was 0.8 cm. Comparative experiment

Example 12 for example processing shrinkage (DIN 53464) %
Post shrinkage (DIN 53464) %
Impact strength (DIN 53453) Kpcm / cm ²

Notched impact strength (DIN 53453) Kpcm / cm ²

Dimensional stability under heat according to Martens (DIN 53 ⁱ * 58) ^ C

Surface resistance (DIN 53482 VZ

Dielectric loss factor (DIN 53483) tg 6

Water absorption (DIN 53472) mg fire resistance (DIN 53459)

Quality grade l | 3

109825/1973/16

0.5-0.7 0.5-0.7 0.1-0.2 0.1-0.2 6-6.5 6-6.5 1.6-1.7 1.6-1.7 120-130 120-130 8-9 8-9 0.3 0.3 15-120 15-120

/ 20387

Example 13

550 g melamine-formaldehyde resin (molar ratio melamine: formaldehyde » 1: 2.1) were mixed with 201 g wood flour (soft type, 201 g wood flour (hard type), 35 g limestone, 10 g zinc stearate, 3 g titanium dioxide and 20 g of red phosphorus (stabilized NN) prepared as in Example 1, test specimens produced and the properties determined. The values determined are compiled in the table below. The resistance to air corresponded to quality grade 1, the weight loss through burning 110 mg and the flame spread 0.1 cm.

Comparative experiment to example 13

The same synthetic resin composition as in Example 13, but without the addition of phosphorus, was prepared as described above Test bodies processed and their values determined. The values obtained are compiled in the table below. the Slip resistance reached grade 3, the weight loss being 280 and the flame spread being 0.8 cm.

Comparative experiment

Processing shrinkage (DIN 53161) % post-shrinkage (DIN 53161) % impact strength (DIN 53153) Kpcm / cm ² notched impact strength (DIN 53 * 153) Kpcm / cm2

Dimensional stability under heat according to Martens (DIN 53158) ° C surface resistance (DIN 53482) VZ dielectric loss factor (DIN 53183) tg 6

Water absorption (DIN 53172) mg water resistance (DIN 53159) Quality grade

Example 13 for example 13 0.1-1.1 0.1-1.1 0.8-1.7 0.8-1.7 6 - 6.5 6 - 6.5 1.6-1.7 1.6-1.7 120-130 120-130 10-11 10-11 0.3 0.3 100-200 100-200

It can be seen from Examples 12 and 13 that the flame retardancy of the curable molding compositions is significantly improved by the additive according to the invention, but that the other criteria thereof are not influenced.
May 16, 1969
Sp / Ski 103825/1973

Claims (1)

_4Ί i / 20387 If P a t e η t a η s ρ r Ü c he 1. Flame-retardant synthetic resin compositions based on A) a or more curable synthetic resins of the groups a) epoxy resins, b) condensation products in the form of phenolic or amine resins and polyesters and B) mineral fillers, optionally hardeners and other conventional additives, characterized in that they contain red phosphorus in a proportion of up to 25% by weight, based on the total mixture. '■■' · ■ ' 2. synthetic resin compositions according to claim 1, characterized in that they contain inorganic oxide, carbonate or boron compounds as fillers. ■ 3. Synthetic resin compositions according to claims 1 or 2, characterized in that that they are calcium borate and preferably finely divided Contains silica as fillers. Λ. Synthetic resin compositions according to Claims 1 to 3, characterized in that they contain at least 50, preferably up to 400 percent by weight λ mineral fillers, based on the resin. 5. synthetic resin compositions according to claims 1 to 4, characterized in that that they contain epoxy resins as curable synthetic resins. January 21, 1970
Dr.LG / Her U niet lay en (Art. , * \ «Us, ζ wr, V Sau a des Alterationsuneajjea. V. .4» a. 109825/1973