JPS61200161A - Thermoplastic molding composition based on polysiloxane/polycarbonate block - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides (A) a polymerization degree Pn of between 5 and 100, preferably between 20 and 80, containing α,ω-bishydroxyaryloxy end groups; was prepared by starting from polydiorganosiloxanes having the following properties and also using a chain terminating agent. 20-80 parts by weight of 10,000-30.0
00, preferably from 15.000 to 25.000, and in each case the total weight of the block copolymer. polydiorganosiloxane/polycarbonate blocks having a content of poly(diorganosiloxane) structural units of between 10% and 0.5% by weight, preferably between 7% and 1% by weight, based on (B) 70 to 5 weight parts of diene monomers, alkyl acrylates and ethylenically unsaturated monomers on rubber selected from EPDM rubber, in granular form, grafted weight; and (C) 5 to 60 parts by weight of a rubber-free thermoplastic vinyl monomer polymer, where components (A) + (B) + (C)
The total parts by weight of are 100 parts by weight in each case, and the components (
A) is a monoalkylphenol or dialkylphenol having a total of 8 to 20 carbon atoms in the alkyl substituent as a chain terminator, preferably a compound of formula (m) [in the formula.

Alk represents a linear or branched alkyl group having 8 to 15 carbon atoms. It is something.

Polydiorganosiloxane/polycarbonate block copolymers according to component (A) and their preparation are described in German patent application P35 filed by the applicant's company.
According to German patent application P3506472.2, about 10,000 to 30,000, preferably about 1
5,000 to 25,000, in each case based on the total weight of the block copolymer. between 10% and 0.5% by weight,
It preferably has a content of poly(diorganosiloxane) structural units of between 7% and 1% by weight, with poly(diorganosiloxane) structures between 5 and 100, preferably 20.
Thermoplastic poly(diorganosiloxane)/polycarbonate block copolymers having a degree of polymerization between -80 and a) between 5 and 100.

α with a degree of polymerization, preferably between 20 and 80.

ω-bis-human xyaryloxy-polydiorganosiloxanes, preferably those of formula (I), b) other diphenols, preferably those of formula (II), C) chain terminators, and optionally d) a branching agent, and phosgene by a known two-phase boundary process, wherein mono- or dialkylphenols having a total number of carbon atoms in the alkyl substituents of 8 to 20, preferably of the formula (III
1.) in a sufficient amount as a chain-terminating agent, preferably based on the diphenols used as component b).
Amounts of 0-10 mol % are used, where the reaction of the phenolic component is quantitative.

This German patent application P3506472.2 also. It also relates to block copolymers obtainable by this method which contain monoalkylphenol or dialkylphenol end groups.

These products have improved demoldability and flow properties and a toughness/brittleness transition point that shifts toward lower temperatures.

The α,ω-bishydroxy-aryloxy-polydiorganosiloxanes of component a) used according to this German patent application P 35 06 472.2 are e.g.
419,634.

Preferably used polydiorganosiloxanes containing α,ω-bishydroxyaryloxy end groups have the formula (I) RRI R′ [wherein the group Ar preferably has 6 to 30 carbon atoms] the same or different arylene groups from diphenols, R and R1 being the same or different, and linear alkyl, branched alkyl, halogenated linear alkyl, halogenated branched alkyl; branched alkyl, aryl or halogenated aryl, preferably methyl, and the number of diorganosiloxy units n=o+p+q=5 to 10
0, preferably 10 to 80].

In the above formula (I), alkyl is, for example, CICoo-
Alkyl and aryl in formula CI) above is, for example, c, -C14-aryl. In formula I above, the term halogenated means partially fully chlorinated, brominated or fluorinated. Examples of alkyl, aryl, halogenated alkyl, halogenated aryl are methyl, ethyl,
Propyl, n-butyl, tert-butyl, phenyl, naphthyl, chloromethyl and trifluoropropyl.

The diphenols used according to the invention for the preparation of the α,ω-bishydroxy-aryloxypolydiorganosiloxanes of component a), preferably of the formula (I), are hydroquinone, resorcinol, dihydroxy Diphenyls, bis-(hydroxyphenyl)-alkanes, bis-(hydroxyphenyl)-cycloalkanes, bis-(hydroxyphenyl)-sulfites,
Bis-(hydroxyphenyl)-ethers, bis-(
hydroxyphenyl)-sulfoxides, bis-(hydroxyphenyl)-sulfones and α,ω-bis-(
hydroxyphenyl)-diisopropylbenzenes, and their respective-alkylated and respective-halogenated compounds. These and other suitable aromatic dihydroxy compounds are described, for example, in U.S. Pat.
271.367 and 2,999,846 and German published specifications 2,063,050 and 2°211.9
It is listed in 57.

Component a) α,ω-bishydroxy-aryloxy-
Diphenols preferably used for the production of polydiorganosiloxanes have the formula (n) [wherein X is a single bond, fl3 and Y1 to Y4 are the same or different, and hydrogen, c, -c4-alkyl, preferably methyl, or halogen, preferably chlorine or bromine].

Examples of suitable diphenols are 2,2-bis-(4-hydrocyphenyl)-furopane, 1.1=bis=(4-
hydroxyphenyl)-cyclohexane, 2.2-bis=(3,5-dichloro-4-hydroxyphenyl)-propane, 2,2-bis=(3,5-dibromo-4-hydroxyphenyl)-propane, 2. 2-bis=(3,5
-dimethyl-4-hydroxyphenyl)-propane, bis-(3,5-dimethyl-4-hydroxyphenyl)-
methane and bis-(4-hydroxyphenyl) sulfide.

Other diphenols of component b) which can be used according to German patent application P 3506472.2 are those mentioned above, and those also mentioned as being suitable have the formula (
Corresponds to II).

Suitable monoalkylphenols and dialkylphenols according to German patent application P 3506472.2 can contain linear and branched alkyl groups. Examples of chain-terminating agents of component C) which can be used according to the invention are p -inoctylphenol, p-nonylphenol di-tert-butyl-phenol, p-tert-octylphenol, p-dodecylphenol,
2-(3,5-dimethyl-heptyl)-phenol and 4-(3,5-dimethyl-heptyl)-phenol.

Instead of monoalkylphenols and dialkylphenols, their halogenocarbonates can also be used.

The branched copper agents of component d) that can be used are those with more than three functional groups, especially those with more than three phenolic hydroxyl groups, and are generally used for branch opening. Known amounts are between 0.05 and 2 mol %, based on the diphenols of component b).
533 and in German Published Application No. 1,595,762 and in US Pat. No. 3,544,514.

Some examples of compounds that can be used with three or more phenolic hydroxyl groups are 2,4-bis-(4-
Hydroxyphenyl-isopropyl)-phenol, 2
, 6-bis-(2'-hydroxy-5'-methyl-benzyl)-4-methylphenol, 2-(4-hydroxyphenyl)-2-(2,4-dihydroxyphenyl)-
propane and 1,4-bis-(4,4'-dihydroxytriphenylmethyl)-benzene. Examples of other trifunctional compounds are 2,4-dihydroxybenzoic acid,
Trimesic acid, cyanuric chloride and 3,3-bis-L
-hydroxyphenyl)-2-oxo-2,3-dihydroindole, and 3,3-bis-(4-hydroxy-3-methyl-phenyl)-2-oxo-2,3-dihydroindole.

The polydiorganosiloxanes containing α,ω-bishydroxyaryloxy end groups and the chain terminator are added together with the other diphenols of component b) in a two-phase boundary process or before the addition of phosgene. It can be added separately during or after the addition of phosgene, but in each case it is added before the addition of the polycondensation catalyst.

Suitable organic solvents for the two-phase boundary process are those commonly known for use with thermoplastic polycarbonates, such as methylene chloride or chlorobenzene.

Basic compounds suitable for the generation of the alkaline aqueous phase are aqueous solutions of LiOH, Na0I (, KOH, Ca(OH)2 and/or Ea(OH)2).

Catalysts suitable for polycondensation by the two-phase boundary process are the tertiary aliphatic amine catalysts known for polycarbonate synthesis, such as trimethylamine, triethylamine, n-
) liprobylamine, n-tributylamine or N
-ethylpiperidine, optionally known quaternary ammorum salts such as tetrabutylammonium bromide,
can also be used.

The amount of catalyst for the two-phase boundary process depends on the phenols used and is between 0.2 and 5 mol% or 5% when using tetramethyl-substituted diphenols. ~10 mol %, based in each case on the total amount of diphenols of component b) used.

The amount of organic phase is preferably selected such that the two-phase boundary polycondensation is carried out in a 5-20% strength organic solution, preferably in a 10-15% strength organic solution.

The volume of the alkaline aqueous phase in the production by the two-phase boundary process is preferably equal to the volume of the total organic phase.

They may be more or less than the total amount of organic phase.

The pH value of the aqueous phase during the reaction is between pH 9 and 14, preferably between pH 12 and 13.

The specific reactant ratios between the other diphenols of l11b) and the polydiorganosiloxanes containing hydroxy-aryloxy end groups are as follows: ) unit content and the reaction of one reactant is usually quantitative.

Carbonic acid halides, especially carbonic acid chlorides, such as phosgene or COB r7 , or bis-chlorocarbonic acid esters of diphenols, are used in known manner as carbonate donors for the preparation by the two-phase boundary process of the corresponding compounds. and in each case less than 1/2 mol of diphenol per halogenocarbonate group is used.

Aromatic thermoplastic block copolymers can be isolated by methods known from polycarbonate synthesis by the two-phase boundary method. In these methods, the organic phase containing the dissolved copolycarbonate is separated, washed, and the copolycarbonate is then isolated by evaporation of the solution, here debo fa
t i l 1sation) An extruder is preferably used as the final stage of the process.

General additives can be added to the resulting block copolymers before, during or after their manufacture. In this connection, examples include dyes, pigments; stabilizers against moisture, heat and UV radiation; and fillers 1, such as glass powder, quartz products, graphite, molybdenum sulfide,
Metal powders and glass fibers may be mentioned.

'ljMA according to German patent application P3506472.2
The siloxane-containing acid, ie the moderate content of dimethylsiloxane in weight percent, based on the total weight of the block copolymer, was determined by nuclear magnetic resonance spectroscopy. The degree of polymerization n obtained by measuring the end groups on the polysiloxane starting material was expressed as the average siloxane block length.

Relative solution viscosities were determined at 25° C. and a concentration of 5 g/liter in methylene chloride.

Izot notch impact strength is 3.2mm wide or 6.
Measurements were made according to ASTM 256-56 on 4 mm test pieces.

Thermal strain point is determined by pie-cutting method (V S T/B/12
0) according to DIN 53460/15O368.

The demolding force was measured on the shell mold.

1. Preparation of polydimethylsiloxane with bisphenol A end groups 19.2 parts by weight of bisphenol A and 1.800 parts by weight of chlorobenzene were added into a vessel equipped with a condenser, dropping funnel and stirrer. The mixture was warmed to 100°C and 11.6 parts by weight of potassium carbonate were added.

A solution of 178 parts by weight of α,ω-bisacetoxypolydimethylsiloxane, Pn=84, in 178 parts by weight of chlorobenzene was then added to the mixture under reflux over 15 minutes, and stirring was continued for a further 2 hours. The mixture was cooled to about 80°C and filtered hot.

2. Preparation of polydimethylsiloxane/polycarbonate block copolymer In a flask equipped with a stirrer, phosgene inlet tube, reflux condenser, internal thermometer and dropping funnel, 3.0
35 parts by weight of bisphenol A, 3,024 parts by weight of sodium hydroxide, 34.700 parts by weight of water, 17,80 parts by weight
0 parts by weight of methylene chloride, 13,100 parts by weight of chlorobenzene and 164.7 parts by weight of 4-(1,1,3°3-tetramethylbutyl)-phenol were mixed with the bisphenol A end group described in 1. of polydimethylsiloxane. 2,216 parts of phosgene were passed through at room temperature, and the pH was kept between 12 and 13 by addition of 45% strength sodium hydroxide solution. The introduction took about 1 hour. Thereafter, 11 parts by weight of triethylamine were added and the mixture was then stirred for a further 45 minutes at pH 12-13. The co-condensate was processed by standard methods for polycarbonates.

Properties Example solution viscosity 1.200 Siloxane-containing star (X) 5.3 Siloxane block length n) 84 Melt viscosity at 300°C/103 g-1, Pa, s 113 Izots)
Notch impact strength according to (3,2go++) room temperature J/
m 557 pieces (zero toughness fracture) = 40℃
J/m 3814 Critical temperature ℃
-Notch impact strength according to Izot (8.4 foot m) below 40 J/m at room temperature 391 pieces -
40℃ J/m 7 X355 pieces/3X
320 Critical Temperature ℃0 Vicat Thermal Strain Point (VST/B/120) 'C141 Mold Cutting Force at 136℃ Mold Temperature/300℃ Material Temperature Bar 5 Component (A) is also polydiorganosiloxane/polycarbonate block Jtiffi composites and others It can also consist of a mixture of polysiloxane-free thermoplastic polycarbonates, the average molecular weight Mw of which in each case also ranges from 10,000 to 30°000, preferably 15.0
00 to 25,000 (Mw was determined by ultrafiltration or diffuse light measurement in a known manner), and the polydiorganosiloxane structural units in the polycarbonate mixture are in each case also the total weight of the block copolymer. between % and 0.5% by weight, preferably from 7% by weight based on
and all the polycarbonates of the mixture contain monoalkylphenyl or dialkylphenyl end groups having a total number of carbon atoms of 8 to 20 in their alkyl substituents, preferably of the formula (DIa) [Formula Among them, Alk is a linear or branched alkyl group having 8 to 15 carbon atoms.] It has a monophenyl terminal group.

The content of poly(diorganosiloxane) structural units is 10
These polydiorganosiloxane/polycarbonate block copolymers may also have a polydiorganosiloxane/polycarbonate block copolymer of at least 40% by weight, preferably 40% to 60% by weight, and a Mw of between 15,000 and 6o, ooo. Suitable for manufacturing types of products.

Such polydiorganosiloxane/polycarbonate block copolymers are described in German patent application P35 of Part E.
06472.2 with a content of poly(diorganosiloxane) structural units of 10% to 0.5% by weight.

Graft polymers (B) in the concept of the present invention are Φ from a system consisting of styrene and methyl methacrylate.
95-50% by weight of styrene, α-methylstyrene, nucleus-substituted styrene, methyl methacrylate or mixtures thereof and 5-50% by weight of acrylonitrile, methyl methacrylate, maleic anhydride, N-substituted It is obtained by grafting a monomer mixture of flemides or mixtures thereof to rubber by polymerization. Suitable rubbers are in particular polybutadiene, butadiene/styrene copolymers with up to 30% by weight of copolymerized styrene, copolymers of butadiene and acrylonitrile with up to 20% by weight of acrylonitrile, or 20% by weight. Lower alkyl esters of acrylic acid or methacrylic acid (up to
For example, copolymers of butadiene with methyl acrylate, ethyl acrylate, methyl methacrylate and ethyl methacrylate).

Examples of other suitable rubbers are polyisoprene or polychloroprene. Also suitable are alkyl acrylate rubbers based on c,-CB-alkyl acrylates, in particular ethyl, butyl and ethylhexyl acrylate. These alkyl acrylate rubbers can optionally contain up to 30% by weight of copolymerized monomers such as vinyl acetate, acrylonitrile, styrene, methyl methacrylate and vinyl ether.

These alkyl acrylate rubbers can also contain relatively small amounts (up to 5% by weight) of ethylenically unsaturated monomers with cross-linking activity. These include, for example, alkylene diol di(meth)acrylates,
These include polyester di(meth)acrylates, di- and trivinylbenzene, triallyl cyanurate, allyl(meth)acrylate, butadiene, imprene, and the like. Such alkyl acrylates are known. Acrylate rubbers as grafting substrates are products containing as a core diene rubbers crosslinked with one or more conjugated dienes, such as polybutadiene, or copolymers of conjugated dienes and ethylenically unsaturated monomers. Union,
Examples of other suitable rubbers, which can also be eg styrene and/or acrylonitrile, are EPDM rubbers, ie rubbers of ethylene, propene and non-conjugated diene monomers.

Diene monomer rubbers or alkyl acrylate rubbers are preferred.

The graft copolymers (B) contain 5-80% by weight, especially 2
It contains 0-70% by weight of rubber and 95-20% by weight, especially 80-30% by weight of monomers copolymerized by grafting. In these graft copolymers, the 5 rubber is 0.09 to 5 gm, especially 0.1 to Igm.
The at least partially cross-linked particle shape has an average particle size of m. Such graft copolymers are based on the presence of rubbers to which monomers from the system consisting of styrene, alpha-methylstyrene, acrylonitrile, methyl methacrylate, nucleus-substituted styrene and maleic anhydride are grafted. are prepared by free radical graft copolymerization as described below, and all of them are known. Suitable production methods for such graft copolymers are emulsion, solution, bulk or suspension polymerization.

Particularly preferred are so-called ABS polymers.

Rubber-free vinyl monomer polymers (C) are prepared from grafting monomers or similar monomers, in particular styrene, α-methylstyrene, halogenostyrene and nuclear-
At least one monomer from the system consisting of alkylated styrene and one monomer from the system consisting of acrylonitrile, methacrylonitrile, methyl methacrylate, maleic anhydride, vinyl acetate and N-substituted maleimides. It is made up of the body. They preferably contain 95-50% by weight of styrene, α-methylstyrene,
Methyl methacrylate or mixtures thereof and 5
-50% by weight of copolymers of acrylonitrile, methacrylonitrile, methyl methacrylate, maleic anhydride, N-substituted maleimide or mixtures thereof.

Such copolymers are often produced as a by-product during graft copolymerization, especially when large amounts of monomer are grafted onto small amounts of rubber.

The amount of copolymer (C) used according to the invention of 5-60 parts by weight per 100 parts by weight of A)+B)+C) does not include these by-products of the grafting polymerization.

Such copolymers, produced separately, are resinous, thermoplastic and rubber-free; they in particular contain styrene and/or alpha, optionally mixed with methyl methacrylate. It is a copolymer of methylstyrene and acrylonitrile.

Particularly preferred copolymers are 20-40% by weight acrylonitrile and 80-60% by weight styrene or α-
Made of methylstyrene.

Such copolymer compositions are known and can be prepared in particular by free radical polymerization methods, especially by emulsion.

It can be produced by suspension, solution or bulk polymerization.

The copolymers preferably have a molecular weight of 15,000 to 2X10S.

Polycarbonate and ABS polymeric thermoplastic mixtures based on aromatic dihydroxy compounds are known in principle (German Patent Specification 1.170,141 and German Published Specification 1°810.993), aromatic Mixtures of group polycarbonates and certain ABS systems are described in German Published Specification 2.259,565, German Published Specification 2,
329.548 and German Publication Specification 2,329°5
It is written in 46.

Very high technical demands are placed on such mixtures. In particular, high toughness, especially at low temperatures, and as high a thermal strain point as possible are required here. Furthermore, the best possible flowability is desirable for the production of very large molded articles. When using polycarbonate molding compositions known according to the prior art,
Such combinations of properties are either not obtainable or are obtained only at the detriment of individual important product properties.

It was therefore surprising that this improved overall property profile was obtained through the use of modified polycarbonates. At the same time, by thermally polymerizing polycarbonate modified with diorganosiloxane blocks into ABS polymer, despite the S+ block,
It was also surprising that molding compositions with good properties were obtained.

The addition of organopolysiloxane/polycarbonate polymers as an impact strength-improving component to mixtures of aromatic polycarbonate and polystyrene resins is known from DE 2,434.085, in which organopolysiloxane/polycarbonate polymers are added as components for improving impact strength. The polycarbonate polymers are those of US Pat. No. 3,189,862.

The organosiloxane/polycarbonate polymers according to U.S. Pat. ing.

Polydiorganosiloxanes known from the relevant literature/
It should also be noted that polycarbonate block copolymers are characterized by their improved mechanical properties at low temperatures (e.g. B, M,
Beach.

R, P, Kampur and A.

R. Schultz, The Fist of the Journal of Polymer Science (J. Polym, Sci.)
), Polym, Lett, Ed.

12.247 (1974)).

The present invention provides graft polymers of ethylenically unsaturated monomers on rubber in particulate form and organopolysiloxane/polycarbonate block copolymers in combination with rubber-free thermoplastic vinyl polymers. The present invention relates to thermoplastic molding compositions having very good flowability based on the present invention and high toughness when subjected to impact, especially at low temperatures, and having an excellent thermal strain point.

The molding compositions according to the invention may contain other known additives, such as stabilizers, pigments, flame retardants, demolding agents and/or
or antistatic agents.

Moldings according to the invention consisting of components A), B), C) and, if appropriate, other known additives, such as stabilizers, pigments, flame retardants, demolding agents and/or antistatic agents. The compositions for use are prepared by mixing the specified components in a known manner and melting the mixture in common equipment such as an internal kneader, extruder or twin screw extruder at a temperature of 200°C to 330°C. Manufactured by compounding or melt extrusion.

The invention therefore provides that after mixing components A), B) and C) and, if appropriate, stabilizers, pigments, flame retardants, demolding agents and/or antistatic IF agents, So 2
Components A), B) and C) and optionally stabilizers, pigments, flame retardants, demolding agents and/or, characterized in that they are subjected to melt compounding or melt extrusion at temperatures between 00°C and 330°C. The present invention also relates to a method for producing thermoplastic molding compositions comprising antistatic IF agents.

The individual components can be mixed in a known manner successively or simultaneously and in particular at 20° C. (room temperature) or at elevated temperatures.

The molding compositions of the invention can be used for producing molded articles of all types. In particular, molded articles can be produced by injection molding. Examples of molded articles that can be produced are household components of all types (for example for household appliances such as juice presses, coffee machines and mixers) or cladding panels for the building sector and components for the automotive sector. They have very good electrical properties and are therefore also used in the electrical industry.

Another type of processing example is the production of molded articles by deep stretching from preformed sheets or films.

Particle size is always W, Scholtan
Other colloid-2-rant ΦZ Polymere (Koolo
id-Z and Z, Polymere), 25
0 (1972), 782-796, as measured by ultra-stretch measurement.

The siloxane content based on the total weight of the block copolymer, i.e. the content of dimethylsiloxy units in % by weight,
was measured by gravimeter and by nuclear magnetic resonance spectrometer. The degree of polymerization, Pn, obtained by measuring the end groups on the siloxane prepolymer is expressed as the average siloxane block length.

X test 1 Polycondensates and polymers used: A, 1. ) German patent application P35064 cited above using inoctylphenol as chain-terminating F agent
72.2. 25°C in CH2Cl
and 1,20 measured at a concentration of 0.5% by weight.
Block length Pn) 84 with relative solution viscosity of 2
copolycarbonate based on bisphenol A and 5% by weight polydimethylsiloxane.

A.2. ) German patent application P35064 cited above using inoctylphenol as chain-terminating F agent
Lettuce prepared according to 72.2 at 25 °C in CH2Cl2
and 1,2 measured at a concentration of 0.5% by weight.
Block length Pn) 8 with relative solution viscosity of 46
Copolycarbonate based on 4% bisphenol A and 5% by weight polydimethylsiloxane.

A.3. ) at 25 °C and 0.5 °C in CH2Cl2, prepared according to the above-cited German patent application P3506472.2 using phenol as chain terminator.
A copolycarbonate based on bisphenol A of block length Pn) 40 and 5% by weight of polydimethylsiloxane, with a relative solution viscosity of 1,31 measured at a concentration of % by weight.

A, 4. ) was prepared using inoctylphenol as a chain-terminating agent. It has a relative solution viscosity of 1,20 measured in CH2Cl2 at 25° C. and a concentration of 0.5% by weight. Homopolycarbonate based on bisphenol A.

A.5. ) Chain stop! A homopolycarbonate based on bisphenol A having a relative solution viscosity of 1.25, measured at 25° C. and a turbidity of 0.5% by weight in CH2Cl2, prepared using inoctylphenol as F agent.

B.) Obtained by emulsion polymerization. SAN graft polymer of 501% by weight styrene/acrylonitrile mixture (72:28 weight ratio) on 50% polybutadiene in particle form with an average particle size (ds o ) of 0.4 pm.

C,) Styrene/acrylonitrile copolymer with a styrene/acrylonitrile ratio of 72:28 and an intrinsic viscosity of [η] = Q , 55 d l/g (measured in dimethylformamide at 20° C.).

All samples contained 0.25 parts by weight of pentaerydrift tetrastearate per 1001 parts of A)+B)+C) as demolding agent.

The molding compositions according to the invention and the comparative substances were prepared at 200-220°C in an internal kneader (volume 1.3 liters).
produced by melt blending at a temperature of .

The molded articles were manufactured by injection molding at 260°C.

Thermal strain point according to pie cut (method B) is DIN 534
Measured according to 60.

Notch impact strength according to Izotz is ASTM-D-2
Measurements were made on a bar with dimensions of 2.5X1/2X1/8 according to 56.

The flow properties were measured at a material temperature of 260° C. with spiral injection moldings of approximately 8 mm width and approximately 2 mm thickness.

The length of the spiral, in cm, represents the flowability measurement.

Flowability was further evaluated by the loading pressure required to produce a bar with dimensions of 2.5 inches x 1/2 inches x l/8 inches in an injection molder (material temperature: 260 °C).
Johannaber, Kunststoffe, 74 (1984)
), 1; see pages 1-5).

The composition of the molding compositions and specific test data are shown in the table below: Experiments according to the invention At (parts by weight) 80
EiOA2,,
80A3 tt A4 tt A5 // B /7 24
18 24G/f
1B 24 1 [1 Notch impact strength according to Izots at room temperature (J/■) 449
450 at 55-20℃ (J/m)
382 338 48 at 30℃ (J/m) 317 28
9 - at -40°C (J/m)
204 148 38 Thermal strain point ('C) according to Picut-B 11[i 117
II Flowability a) Spiral length am) 48
53 41b) (Load pressure, 260℃) (
Bar) 93 85 11 Comparative experiment 0B0 1e 24 16 24 24
1Ef24 1B 24 16
18 241 582 1319 831
428 b19 5377 100 13
4 110 90 123 +07 As shown in the table below, very good fluidity was obtained by using the polysiloxane/polycarbonate block copolymers according to the invention. The molding compositions according to the invention were also characterized by substantially better low temperature toughness compared to products based on pure bisphenol A polycarbonate.

Claims (1)

Claims: 1. (A) Starting from polydiorganosiloxanes with a degree of polymerization Pn between 5 and 100 containing α,ω-bishydroxyaryloxy end groups and also using chain terminators. 20 to 80 parts by weight of an average molecular weight Mw of 10,000 to 30,000 (determined by ultrafiltration or diffuse light measurement in a known manner) and in each case a block Poly(diorganosiloxane)/polycarbonate block copolymers having a content of poly(diorganosiloxane) structural units between 10% and 0.5% by weight, based on the total weight of the copolymer, (B ) 70 to 5 parts by weight of diene monomers, alkyl acrylates and ethylenically unsaturated monomers on rubber selected from EPDM rubber, in particulate form, and (C) 5 to 60 parts by weight. parts by weight of rubber-free thermoplastic vinyl monomer polymer, where the total parts by weight of components (A) + (B) + (C) are in each case 100 parts by weight; (A
) are thermoplastic moldings, such as those produced by a phase boundary method using monoalkylphenols or dialkylphenols having a total of 8 to 20 carbon atoms in the alkyl substituents or halogenocarbonate esters of these phenols as chain terminators. Composition for use. 2. Component (A) is a chain terminator using the general formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (III) [In the formula, Alk represents a linear or branched alkyl group having 8 to 15 carbon atoms. The thermoplastic molding composition according to claim 1, which is produced by a phase boundary method using a phenol represented by: 3. Claims 1 or 2 further contain a thermoplastic polycarbonate that does not contain other siloxanes, mixed with the diorganopolysiloxane/polycarbonate block copolymer of component (A). Thermoplastic molding composition as described. 4. The poly(diorganosiloxane)/polycarbonate block copolymer of component (A) is 15,000 to 25,
Claim 1 having an average molecular weight Mw of 000
The thermoplastic molding composition according to any one of items 1 to 3. 5. The content of poly(diorganosiloxane) structural units in the block copolymer of component (A) is between 7% and 1% by weight, in each case based on the total weight of the block copolymer. The thermoplastic molding composition according to any one of claims 1 to 4. 6. The thermoplastic molding composition according to any one of claims 1 to 5, wherein the chain terminator is any of the phenols specifically mentioned in the specification. 7. A thermoplastic molding composition according to claim 1, substantially as described in relation to any of the experiments identified in the Examples as experiments according to the invention. 8. Any one of claims 1 to 7, which contains at least one additive selected from stabilizers, pigments, flame retardants, mold cutting agents, and antistatic agents. The thermoplastic molding composition described in . 9. Components (A), (B) and (C) are mixed and then subjected to melt blending or melt extrusion in a blending or extrusion device at a temperature of 200° C. to 330° C. A method for producing thermoplastic molding compositions according to any one of Item 6. 10. For molding according to claim 8, in which at least one additive selected from stabilizers, pigments, flame retardants, mold release agents, and antistatic agents is included in the mixture. 10. A method according to claim 9 for producing a composition. 11. Substantially as described in the specification with respect to any of the molding compositions according to claim 1,
A method according to claim 9. 12. A molding composition produced by the method according to any one of claims 9 to 11.