DE2713708A1 - TRIBAL MIXTURE FOR COLORING AND / OR MODIFYING HOMOPOLYMERIZED AND COPOLYMERIZED AND THESE PLASTIC COMPOSITION - Google Patents

Description

Henkel, Kern, Feiler for Kär-ie 'patent attorneys SOUTHWEST PLASTICS EUROPE S.A. Möhlstrasse 37

". . _. . D-8O00 Munich 80

Pepinster, Belgium

Tel .: 089/982085 87 Telex: 0529802 hnkld telegrams: ellipsoid

March 28, 1977

Stock mixture for coloring and / or

for the modification of homo- and copolymers

and plastic compound containing them

709840/0986

The present invention relates to improved masterbatches such as them usually for coloring or for improving and / or modifying certain properties of homopolymers such as polyethylene and polypropylene, polystyrene, polyvinyl chloride, or copolymers such as those made of acrylonitrile butadiene styrene (ABS) and similar, find use.

Master mixtures of this type are known to consist of low-pressure polyethylene, high-pressure polyethylene, ethylene-vinyl acetate copolymers or isotactic polypropylene, to which up to about 75 percent by weight of fillers and pigments are mixed. Furthermore, these mixtures can contain lubricants such as stearic acid, metal stearates, in particular calcium or aluminum stearate, or waxes, the metal stearate content generally being up to 2% and waxes up to 15%.

The fillers usually used • are calcium carbonate, kaolin, silica or talc.

The most commonly used pigments are titanium di-

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xid, carbon black., organic and

called inorganic pigments and organic dyes.

Furthermore, such mixture of stems can be different Additives such as antimony trioxide and halogenated substances, among other things Chloi ^ jparaff ine, contain, for example, to give the products to be manufactured from them flame-retardant properties. Such Additives can also be incorporated in the absence of the pigments mentioned.

These stock mixes are usually used in amounts of approximately 2 to 4 percent by weight of uncolored, powdered or granulated polymers and the thermoplastic compositions prepared in this way in a compression or injection molding process to make foils, cable insulation and other molded parts processed.

As has now been found, parent mixtures with improved properties are obtained when in the previously common compositions the low-pressure or high-pressure polyethylene, the ethylene-vinyl acetate copolymers or the isotactic polypropylene in whole or in part be replaced by atactic polypropylene.

The atactic polypropylene produced in the manufacture of normal or isotactic polypropylene became

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previously regarded as a hardly usable by-product or waste product, its elimination often difficulties prepared.

According to the invention, this atactic polypropylene can now used for the production of stock mixtures for coloring and / or modifying homo- and copolymers be, these master mixtures in addition to one or more pigments and / or one or more modifiers, and optionally a lubricant and / or filler up to about 25 percent by weight may contain atactic polypropylene.

The master mixtures according to the invention consequently consist essentially of a mixture of atactic Polypropylene and one or more polyolefins the series of low-pressure and high-pressure polyethylene, isotactic polypropylene and ethylene-vinyl acetate copolymers.

The use of atactic polypropylene in the masterbatches of the invention brings several advantages with himself.

Since the atactic polypropylene has hitherto been regarded as an inferior and therefore cheap by-product, results the use of which is much cheaper stock mixtures than those previously prepared with low-pressure polyethylene Base mixes.

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The ewe item shows the master mixes according to the invention a better flowability than the previously prepared mixtures of similar composition and their mixtures with polymer granules can be diluted much more easily.

The better flowability and blending ability of the according to the invention a content of atactic polypropylene containing stock mixtures is also not due to increased filler and / or pigment contents impaired.

It was previously believed that the use of atactic polypropylene in the manufacture of press or Injection moldings would lead to a reduction in the physical properties of the same. However, it was found that when using the stock mixtures according to the invention with high solids contents, in which the content of atactic polypropylene is below 25 percent by weight, such minor ones Amounts of atactic polypropylene (approximately 0.5 to 1 percent by weight) in the finished molded products exist that their mechanical properties are practically unchanged.

In a preferred embodiment of the invention there is at least part of the filler content of a stock mixture of calcium carbonate according to the invention

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having a particle size of from about 0.5 to 15 microns, especially from about 0.5 to 4 microns. This Filler facilitates the processing of the thermoplastic masses, by counteracting the sticking tendency of atactic polypropylene.

Metal stearates such as calcium or Aluminum stearate, high molecular weight organic fatty acids such as stearic or palmitic acid, and others known lubricants ^ such as waxes or plasticizers incorporated will.

If a stock mixture according to the invention contains a white pigment such as titanium dioxide, it is advantageous to reduce the yellowing of the stock mixture or the finished thermoplastic compounds caused by the influence of light or by the action of various substances, including antioxidants containing phenol groups, by adding, for example, 1 to 5 percent by weight of one such discoloration preventing agent as citric acid or stearic acid ₍ to counteract.

The master mixtures according to the invention preferably contain between approximately 40 to 90 percent by weight of one or several pigments, between 0 and 40 percent by weight of a filler, with the use of calcium carbonate is preferred, zv / isehen 0 and about 5 weight

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Percent of a lubricant and a maximum of up to 25 percent by weight of atactic polypropylene, as well as optionally one or more additional polyolefins such as low pressure polyethylene, high pressure polyethylene, isotactic polypropylene and / or an ethylene-vinyl acetate copolymer.

The molecular weight of the substance to be used in the present invention Atactic polypropylene is not critical.

The invention also relates to plastic compounds for Production of molded goods such as foils, hoses, cable insulation and the like, in a compression or injection molding process, which consists of a mixture of about GO to 99 percent by weight of a polymer, for example a polyolefin such as polyethylene, isotactic polypropylene, polystyrene, polyvinyl chloride, an ABS copolymer or analogous polymers, and about 1.0 to 20 percent by weight of a master mixture according to the invention with an atactic polypropylene content, which preferably does not exceed about 25 percent by weight lies.

The following exemplary embodiments, which do not limit the invention, illustrate some improved embodiments according to the invention Master mixtures obtained by intimate mixing of the listed Ingredients have been prepared.

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27137Q8

EXAMPLE 1 Components by weight Titanium dioxide 52 Calcium carbonate 35 Atactic polypropylene 13 EXAMPLE 2 Components by weight Soot black SRF ^ 7.5 Calcium carbonate 23.8 Low pressure polyethylene (melt index 20) 15.0 Atactic polypropylene 13.7

100.0

Melt index at 1S0 ° C and one
Load of 2.16 kg

EXAMPLE 3 Components by weight Titanium dioxide (rutile) 50.0 Potassium carbonate 25.0 Low pressure polyethylene (melt index 20) 12.5 Atactic polypropylene 12.5

100.0

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EXAMPLE 4 ΑΧ

Components Weight percent Soot black SRF 40 calcium carbonate 25th Kaiziurastearate 2 Low pressure polyethylene 23 Atactic polypropylene 10 EXAMPLE 5 Components Weight percent Titanium dioxide 50 Calcium carbonate 35 Calcium stearate 1 citric acid 1 Low pressure polyethylene (melt index ²⁰ > 6.5 Atactic polypropylene 6.5

EXAMPLE 6 Components by weight

Carbon black SRF 40

Calcium carbonate 25

Aluminum stearate 1

Low pressure polyethylene 12

High pressure polyethylene 12

Atactic polypropylene 10

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EXAMPLE 7 Ingredients: titanium dioxide, calcium carbonate, stearin, high pressure, isotactic atactic

EXAMPLE 8 Ingredients Carbon Black Calcium Carbonate Low Pressure Isotactic Atactic

EXAMPLE S Constituent

Titanium dioxide calcium carbonate aluminum etearate Citric Acid Low Pressure Polyethylene High Pressure Polyethylene Isotactic polypropylene Atactic polypropylene

Components Weight percent Titanium dioxide 50 Calcium carbonate 35 Stearic acid 1 High pressure polyethylene 3.25 Isotactic polypropylene 3.25 Atactic polypropylene 6.5 EXAMPLE 8 Components Weight percent Soot black SRF kO Kaiζ ium carbonate 25th Calcium stearate 1 Low pressure polyethylene 12th Isotactic polypropylene 12th Atactic polypropylene 10 EXAMPLE 9 Components Weight percent

50 34 1 1 2 3 2 8

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IC
EXAMPLE 10 2713708 Components Percentage by weight Soot black SRF 40 KaIz iumk a rbonate 24 Calcium stearate 2 Low pressure polyethylene 8th High pressure polyethylene 8th Isotactic polypropylene 8th Atactic polypropylene 10 EXAMPLE 11 Components Weight percent Titanium dioxide (rutile) 50 Calcium carbonate 25th High pressure polyethylene 10 Atactic polypropylene 15th EXAMPLE 12 Components Weight percent Antimony trioxide 25th Chloroparaffin 25th Low pressure polyethylene 35 Atactic polypropylene 15th

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EXAMPLE 13 Components

Titanium dioxide calcium carbonate Ethylene-vinyl acetate copolymer atactic polypropylene

2713708 Weight percent 50 25th 12, 12, , 5 , 5

^K / ~ claims

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OWQINAU INSPECTED

Claims (19)

PATElJT AK PROVERBS 1.- Mixture for coloring and / or modification of homo- and copolymers ^ containing one or more pigments and / or codification agents, optionally a lubricant and / or a Fillers, as well as atactic polypropylene. 2. caulking mixture according to claim 1, characterized in that the content of atactic polypropylene does not exceed is about 25 percent by weight of the mixture. 3.- stock mixture according to claim 1, consisting essentially of a mixture of atactic polypropylene and at least one further polymer from the series of low-pressure and high-pressure polyethylene, des isotactic polypropylene and ethylene-vinyl acetate copolymers. 4.- stock mixture according to one of claims 1 to 3, characterized in that the filler is calcium carbonate is. 5 - stock mixture according to claim 4, characterized in that that the calcium carbonate used as a filler has a particle size of 0.5 to 15 and in particular of 0.5 to 4 microns. 6.- stock mixture according to one of claims 1 to 5, characterized in that it is an organic acid contains to prevent yellowing in the presence of the in - 13 709840/0986 the mixture contained white pigment (s). 7.- stock mixture according to claim 6, characterized gekennzoic'mct, that the organic acid stearic acid or lemon? öurc is. 8.- Mixture of seeds according to one of the preceding Claims containing furthermore a fer.tes lubricant from the series of stearic acid metal salts, waxes, plasticizers and similar products. 9.- stock mixture according to one of the preceding claims, characterized by a content of pigment (en) between about 40 and 90 percent by weight. 10, - stock mixture according to one of the preceding claims, characterized by a filler content between 0 and approximately 40 percent by weight, as Filler preferably calcium carbonate is used. 11.- stock mixture according to one of the preceding claims, characterized by a content of lubricant between 0 and about 5 percent by weight. 12.- Plastic compound for the manufacture of molded products after a press or injection molding process, 709840/0986 - 14 - consisting of a mixture of about 80 to 99 percent by weight of an uncolored or unmodified one Hcmo- or copolymers and about 1.0 up to 20 percent by weight of a stamina mix according to one of the preceding claims. 13.- Plastic compound according to claim I2, characterized in that that the polymer is a polyolefin. 14.- Plastic compound according to claim I3, characterized in that that the polyolefin is a polyethylene. 15.- Plastic compound according to claim 15, characterized in that that the polyolefin is an isotactic polypropylene. 16 - plastic compound according to claim 12, characterized in that that the polymer is polystyrene. 17.- Plastic compound according to claim 12, characterized in that that the polymer is polyvinyl chloride 1 8.- plastic composition according to claim 12, characterized in that the polymer is a copolymer of acrylonitrile, butadiene and styrene. 19 .- plastic compound according to claim 12, characterized in that the polymer is a copolymer is made of ethylene and vinyl acetate. 709840/0986