CS254945B1 - Additive polymers of propene for film production - Google Patents

Abstract

Additive polymers of propene with a melt flow index of 1.0 to 9.0 g/10 min. intended for the production of films, especially biaxially oriented, which allow the production of films with reduced electrification and reduced friction coefficients while achieving very good corona treatment efficiency, excellent optical properties and high heat seal strengths. These polymers of propene contain amines in an amount of 0.05 to 1% by weight, glyceryl esters of fatty acids in an amount of 0.01 to 0.5% by weight, amides of higher fatty acids in an amount of 0.02 to 0.25% by weight and alkylphenols with alkyls in positions 2, 4, 6 in an amount of 0.02 to 1% by weight.

Description

254945

BACKGROUND OF THE INVENTION The present invention relates to additive-polymerized films for the production of films, in particular biaxially oriented.

It is known from the technology of production and application of polypropylene films that, in addition to the properties of the polymer itself, its additive system, which is essential, affects both the manufacture of the product and its use. The decisive role of propylene-based polymeric systems is especially in the production and use of biaxially oriented films. Such additive systems generally must contain a slip agent and a suitable antistat. The mechanism of sliding agent action in polyolefins is well described by BIRKS, A.M. in PlasticsTechnology 23, 1977, No. 8, pp. 131-139. Contemporary ideas about the mechanism of electrical charge formation on the surface of plastics are described in Paskaging 23, 1984, No. 2, p. 44-47 ARMSTRONGOM, W.R. In particular, higher fatty acid amides are used as glidants in propene polymers. As these substances reduce friction, they also reduce the generation of electrical charge on the surface of plastic products. However, they deteriorate the heat sealing and corona treatment of the films. For the antistatic treatment of polyolefins, ethoxylated amines are used. Though they are effective even at low relative humidity, their disadvantage is that they migrate slowly to the surface of the plastic article and their use in higher concentrations is not permitted by health authorities. In contrast, the fatty acid glyceryl esters migrate relatively quickly, but their antistatic efficiency is low and starts at a relative air humidity of 50%. Above all, the optical properties of the films deteriorate, most strongly at higher temperatures and efficient finishes. However, they improve non-slippery properties. The individual components of the additive systems are important to one another and their composition needs to be ascertained above the particular product, the method of preparing the polymer and its processing.

These drawbacks remove the propylene-based additive polymers, which consist in the fact that they contain ethoxylated amines of the chemical structure

(CzHi) xH /

R — N \ t

(C 2 H 4 O) y H where R is alkyl of 8 to 20 carbon atoms, x, y is 1 to 25 in an amount of 0.05 to 1% by weight, glycerol esters of CH 2 OOCR 'fatty acids

AND

CHOH

CH 2 OH wherein R 1 contains 12 to 22 carbon atoms in an amount of 0.01-0.5% by weight, fatty acid amides of 16-22 carbon atoms in an amount of 0.02 to 0.25% by weight, alkylphenols with alkyls 1 to 1 4 carbon atoms at positions 2, 4, 6 in an amount of 0.02 to 0.5 wt.%. and calcium stearate in an amount of 0.02 to 0.12% by weight, wherein the aforementioned amounts are based on the polymer. Advantages are that such propene polymers can be successfully used for the production of various types of foils which have reduced electrification and reduced treble coefficients, which is a condition for their use on packaging machines operating at increased speeds, finally, the foils have a high corona treatment efficiency at the same time changing only minimally, which is a prerequisite for achieving a high quality coating, excellent optical properties and high thermal weld strength. Example 1

Isotactic polypropylene powder with a melt index of 2.2 g / 10 min. wt. pentaerythritol tetrakis 3- (3,5-di-tert-butyl-4-hydroxyphenylpropionate, 0.25pre, octadecyl 3- (3,5-di-tert-butyl-4-hydroxyphenylpropionate and 0.08% calcium stearate). The line BU 0 32 was prepared at band temperatures of 205, 220, 220, 220 and 210 ° C with a tubular foliage of 0.025 mm thickness. Foil / foil coefficients were measured according to DIN 53375 and the small values were: static - 0 , 43, kinetic - 0.41 The surface resistance according to CSN 341382 was 10 Ω, and this value did not change with time.

The isotactic polypropylene powder having a melt index of 2.2 g / min was added in a powder of 0.02% by weight. pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl)] propionate, 0.25 wt. 2,6-di-tert-butyl-4-methylphenol, 0.08 wt. % calcium stearate and 0.1 wt. erucylamide. The tubular film was prepared and its properties measured according to the procedures set forth in Example 1. The following values were measured: static coefficient of film / film coefficient 0.30, film / film kinetic coefficient of 0.29 and surface resistance, which did not change over time was ΙΟ11 Ω. Example 3

The isotactic polypropylene powder with a melt index of 2.2 g / 10 min was added with 0.02 µm. wt. pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl] propionate, 0.250.08% by weight of calcium stearate and 0.15% by weight of 2,6-di-tert.butyl The 4-methylphenol, the weight of glycerol monostearate, the folios were prepared and its properties measured as in Example 1. The following values were determined: static coefficient of friction foil / film 0.30, kinetic coefficient of friction film / foil 0.29, the surface resistivity with time was 10 ° C

The isotactic polypropylene powder having a melt index of 2.2 g / 10 min was added to Example 3 except that the additive system still contained 0.1% erucylamide. The foil was prepared and its properties measured according to the procedures of Example 1 The following values were measured: static coefficient of friction of the film / film 0.30, kinetic coefficient of friction of the film / foil 0.29, surface resistivity not changing with time was 1011 Ω. Example 5

The isotactic polypropylene powder with a melt index of 2.2 g / 10 min was added with 0.02 µm. wt. pentaerythritol tetrakis (3- (3,5-di-tert-butyl-4-hydroxyphenyl)] propionate, 0.25% by weight of 2,6-di-tert-butyl-4-methylphenol, 0.08% by weight. Calcium stearate, 0.1% orucylamide and 0.15% ethoxylated amine were prepared and measured as described in Example 1. The following values were found: static friction coefficient of foil / foil 0.31, kinetic coefficient of fractions / foil 0, 30, surface resistivity 1 day of film preparation 10 «, 28 days after preparation of 10« film.

The isotactic polypropylene powder having a melt index of 2.2 g / 10 min was added to Example 5 except that the additive system still contained 0.15% glycerol monostearate. The foils were prepared and their properties were measured as in Example 1. The following values were found: static coefficient of friction / foil 0.30, kinetic coefficient of friction / foil 0.28, surface resistance after 1 day of foil production 1013 3, 14 days after foil production 1012 28, 28 days after foil production ΙΟ12 Ω. Example 7

The isotactic polypropylene powder with an index of 2.2 g / 10 min was added to 0.0 µm. wt. pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 0.25pere. wt. 2,6-di-tert-butyl-4-methylphenol. % calcium stearate, 0.15 wt. of an ethoxylated amine, 0.1 wt. % eucucyl amide and 0.075 wt. the glyceryl ammonium process was used to make biaxial stearate. Polypropylene additivated with said oriented films of 20 gm thickness by sequential orientation technology. The properties of the films were as follows: static coefficient of friction film / film 0.35, haze according to ASTM-D1003 - 0.4%, gloss according to ASTM-D 2 457-70100%, corona treatment efficiency 47 mN / m, surface resistance to C3N 341382 seven days after the production of foils 10 Ω, 14 days after the production of foils 10 Ω. Example 8

The isotactic polypropylene powder having a melt index of 2.2 g / 10 min was additive and the bi-axially oriented film was produced as in Example 7. The film was varnished with polyvinylidene-coboride dispersions, with a coating thickness of 9.2 g / m 2. The properties of the films were as follows: static coefficient of film / foil according to DIN 53375 was 0.35, haze according to ASTM-D 1 003 was 3.5%, gloss of ASTM-D 2 457-70 - 100%, strength (110) ° C, 0.5 s, 0.3 MPa 2.6 N / 15 mm, surface resistivity according to CSN 341382 seven days after the production of foils 10 Ω, 14 days after the production of foils 10 Ω.

The isotactic polypropylene powder with a melt index of 2.2 g / 10 min was added with 0.02 µm. wt. pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) [propionate, 0.25pre. wt. 2,6-di-tert-butyl-4-methylphenol, 0.08% calcium stearate, 0.2% ethoxylated amine, 0.1% erucylamide and 0.05% glycerol monostearate. The so-doped polypropylene was used to produce coextruded biaxially oriented polypropylene films by a gradual orientation technique, the outer layer of which was a statistical propylene / ethylene copolymer with a melting index of 5 g / 10 min. The thickness of the foil foils 25 μπι was as follows: the static coefficient of friction of the foil / foil of the sub-DIN 53375 was 0.32, haze according to ASTM-D1003 - 1.8% gloss according to ASTM-D 2457-70bol 88.3%, strength heat sealing (130 ° C, 1 s, 0.1 MPa 12 N / 38 mm, corona treatment efficiency 45 mN / m. CSN 341382 surface resistance seven days after foil production10 «14, 14 days after production foil 1012 Ω.

The subject matter of the invention can be utilized in the production of films of propene polymers, especially biaxially oriented.

Claims (1)

SUBJECT Additivated propene polymers for the production of foils, characterized in that they contain ethoxylated amines of chemical structure (CzH4O) _x H / R — N \ (C ₂ H ₄ O) _y H wherein R is alkyl of 8 to 20 carbon atoms, x, y is 1 to 25 in an amount of 0.05 to 1% by weight, fatty acid glycerol esters INVENTION CH2OOCR ' I CHOH I CH 2 OH wherein R 'contains 12 to 22 carbon atoms in an amount of 0.01-0.5% by weight, higher fatty acid amides of 16 to 22 carbon atoms in an amount of 0.02 to 0.25% by weight, alkylphenols with alkyl 1 to 4 carbon atoms in the 2, 4, 6 positions in an amount of 0.02 to 0.5% by weight; and calcium stearate in an amount of 0.02 to 0.12% by weight, the above amounts being based on the polymer. Severography, n. p. Race 7, Most Price 2,40 Kčs