NL8500696A - POLYPROPENENE RESIN PRODUCT RESISTANT TO RADIATION. - Google Patents

Description

: 71

Radiation resistant polypropylene resin product.

The invention relates to a polypropylene resin product which is resistant to radiation.

Polypropylene resin is hygienically excellent and its articles are translucent (transparent) to such an extent that its contents can be seen from the outside. Therefore, they have found widespread technical application in food containers, medicine containers, medical instruments and the like.

However, in areas of application, such as food containers, medicine containers and the like, it is important to be able to check (verify) whether dust and other foreign material has been mixed with its contents.

It is also desirable to be able to control the natural colors of its contents without being adversely affected by the containers.

In the areas of application described above, there is a great demand for improvements in the transparency of containers, instruments, and the like, which are made of polypropylene resin.

Furthermore, food containers, drug containers, medical devices and the like must be sterilized prior to use for their fields of application.

The sterilization thereof is generally accomplished with steam, ethylene oxide gas with high sterilization, hydrogen peroxide, etc.

Radiation sterilization, which is accomplished by exposure to radiation, has developed over the past few years and has proven increasingly useful for the sterilization of food containers or medicine containers and instruments.

8500696 '* ί - 2 -

Polypropylene resin is resistant to steam sterilization and gas sterilization. However, it has the disadvantage that it is poorly resistant to radiation sterilization, because yellowing occurs and the properties also deteriorate.

Particularly with regard to the deterioration of the properties, it is noted that the shock resistance of polypropylene resin is reduced by half upon exposure to radiation as compared to its shock resistance to radiation exposure. This deterioration in properties becomes even more apparent when the polypropylene resin is heated after exposure to radiation. Thus, the embrittlement of the polypropylene resin is promoted, whereby brittle fractures are developed.

Certain specific stabilizers (stabilizers) can be added to the polypropylene resin to prevent deterioration in properties of the polypropylene resin after radiation exposure. For example, it is known to use a triaryl phosphite alone, a triaryl phosphite and a hindered phenolic antioxidant in combination, or a triaryl phosphite and light and weather stabilizer of the hindered amine type in combination (see Japanese Patent Publication 179,234 / 1982) .

With a single addition of a triaryl phosphite, such as tris (2.5-di-tert-butylphenyl) phosphite or tris (2,4-di-tert-butylphenyl) phosphite, it is still difficult to make polypropylene resin moldings (articles) sufficiently resistant. against radiation. It is therefore desirable to use yet another stabilizer in combination.

A combined use of such a triaryl phosphite with a hindered phenolic antioxidant, such as 2,6-di-tert-butyl-p-methylphenol or tetrakis / methylene-3- (3.5-35 di-tert-butyl-4-hydroxyphenyl) propionate / methane, however, results in the difficulty of yellowing poly-8500696. * -3- propylene resin moldings when used in quantities / sufficient to maintain the stability of the moldings immediately after exposure to radiation / and when subjected to heat treatment after exposure.

When such a triaryl phosphite is used in combination with a hindered amine light and weather stabilizer such as bis (2.2.6.6-tetramethyl-4-piperidyl) sebacate, N.N'-bis (2.2.6.6-10 tetramethyl) -4-piperidyl) hexamethylenediamine polymer or a condensation product of dimethyl succinate and 2- (4-hydroxy-2,2,6,6-tetramethyl-1-piperidyl) ethanol, the resulting polypropylene resin moldings have satisfactory radiation stability and are free from yellowing difficulties. However, they have difficulties with regard to transparency.

Of the different combinations, the combined use of tris (2,4-di-t-butylphenyl) phosphite and N.N1-bis (2.2.6.6-tetramethyl-4-piperidyl) hexamethyl-20-lendiamine polymer is good, especially in terms of resistance to radiation. Because these stabilizers are safe, products using these stabilizers in combination are excellent for use in areas of application, such as food containers and medical equipment, except for transparency difficulties.

Although polypropylene resin moldings incorporating these stabilizers, as noted above, exhibit good irradiation resistance, they are substantially opaque (opaque). When such moldings (articles) are used as containers intended to receive materials or chemicals therein, for example, food containers, drug containers, medical devices such as syringes, and the like, they exhibit the serious disadvantages that their transparency is still insufficient and that they do not allow the easy control (observation) of small dust particles or foreign material mixed with the content, nor the perception of the natural colors of the content.

5 Due to the recent cost reduction requirements, there is a demand for molded articles with thinner walls and high production by injection molding (injection molding). Thus, there is a demand for a polypropylene resin product with a high molding flowability.

An object of this invention is to provide a polypropylene resin product which is irradiation resistant, exhibits no yellowing and deterioration in properties and has excellent transparency.

Another object of this invention is to provide a polypropylene resin product which is resistant to irradiation, exhibits no yellowing and deterioration of properties, and which has excellent transparency and moldability.

Other objects of this invention will become apparent from the following description.

The invention provides the following polypropylene resin product:

A radiation-resistant polypropylene resin product with excellent transparency, comprising: (a) a polypropylene resin, (b) a sorbitol derivative represented by the general formula 1, wherein R represents a hydrogen atom or an alkyl group of 1-18 carbon atoms, (C) a phosphite compound represented by the general formula 2, wherein R 1 is a tertiary butyl, 1,1-dimethylpropyl, cyclohexyl or phenyl group and R 1 is a hydrogen atom or a methyl, tertiary butyl, 1,1-di -methylpropyl, cyclohexyl or phenyl group, and (d) a polyamine compound represented by the general formula 3, wherein n represents an integer 8500696 * tt-5 - number from 1 to 40 on average, with the contents of the said compounds (b), (c) and (d) 0.005-8 parts by weight, 0.01-4 parts by weight and 0.01-4 parts by weight, respectively, all based on 100 parts by weight of the polypropylene resin ( a).

The flowability of the above resin product can be further improved by subjecting it to thermal degradation at a temperature of 190-270 ° C in the presence of (e) an organic peroxide.

Below is a more detailed description of the invention.

The polypropylene resin which can be used in the practice of this invention may be a propylene homopolymer, a propylene-ethylene copolymer having an ethylene content of 0.1-7% by weight, a propylene-α-olefin. copolymer, which has an α-olefin content of 0.1-20% by weight and may optionally contain ethylene, or the like. On the other hand, the polypropylene resin can be a mixture of these polymers. The α-olefin preferably contains 4-8 carbon atoms, with butene-1, hexene-1 and 4-methylpentene-1 being particularly preferred.

Examples of the sorbitol derivative represented by the formula 1 which can be used in the practice of the present invention include di-benzylidene sorbitol, 1,3,2,4-di (methylbenzylidene) sorbitol, 1,3,2,4-di (ethylbenzylidene ) sorbitol, 1,3,2,4-di (propyl-benzylidene) sorbitol, 1,3,2,4-di (butylbenzylidene) sorbitol, 1,3,2,4-di (hexylbenzylidene) sorbitol, etc. Each of the compounds mentioned above have three isomers, that is, the ortho isomer, the meta isomer and the para isomer, depending on the position of the substituent group R in the formula 1. However, there is a significant difference in quality between the isomers. From a practical point of view, their para-isomers are preferred because of their easy availability.

8500696 »t - 6 -

The sorbitol derivative is taken up in an amount of 0.005-8 parts by weight, preferably 0.01-8 parts by weight. parts and in particular 0.05-1 parts by weight, all based on 100 parts by weight of the polypropylene resin. Amounts of less than 0.005 parts by weight are not able to improve transparency to any significant degree. If the said derivative is added in amounts greater than 8 parts by weight, leakage difficulties will occur.

It is therefore not preferable to include the sorbitol derivative in amounts outside the former range.

As typical examples of the phosphite compound represented by the formula 2 which can be used in the practice of this invention, mention may be made of tris (2,5-di-tert-butylphenyl) phosphite, 15 tris (2-tert.-) butylphenyl) phosphite, tris / 2- (11-dimethylpropyl) -phenyl-7-phosphite, tris (2-phenylphenyl) phosphite, tris (2-cyclohexylphenyl) phosphite, tris (2,4-di-tert-butylphenyl) phosphite, tris (2 -tert.-butyl-4-phenylphenyl) phosphite and the like.

The phosphite compound is added in an amount of 0.01-4 parts by weight or preferably 0.02-2 parts by weight. When added in amounts of less than 0.01 part by weight, no significant effects on stability after radiation exposure are obtained. Even if it is included in amounts greater than 4 parts by weight, the effects thereof are not greatly improved. On the other hand, such an excessive inclusion leads to a higher price.

The latter is certainly not desirable.

The polyamine compound represented by the formula 3 which can be used in the practice of this invention is added in an amount of 0.001-4 parts by weight or preferably 0.02-2 parts by weight. Amounts less than 0.1 parts by weight have no significant effect on stability after radiation exposure.

Even if this compound is incorporated in amounts greater than 4 parts by weight, its effect is not improved to any significant extent. On the other hand, such an excessive inclusion leads to a higher price. The latter is certainly not desirable.

As examples of organic peroxides, tert can be mentioned. -butyl peroxypivalate, lauroyl peroxide, benzoyl peroxide, cyclohexanone peroxide, tert-butyl peroxy isopropyl carbonate, tert-butyl peroxybenzoate, methyl ethyl ketone peroxide, dicumyl peroxide, 2,5-dimethyl-tert-butylperyl. -butyl peroxide, 2,5-dimethyl-10 2,5-di (tert-butyl peroxy) hexyn-3 and the like. They can be used either individually or in combination. The amount of the organic peroxide to be taken may vary depending on the melt index of each polypropylene resin and the target melt index to be obtained after the molecular weight adjustment. It may generally be convenient to add the organic peroxide in an amount of 0.001-0.1 parts by weight per 100 parts by weight of the polypropylene resin.

The product of this invention may have various additives commonly used in such a product, for example, neutralizing agent, nucleating (nucleating) agent, antioxidant, ultraviolet light absorbing agent, ultraviolet light stabilizer, pigment, dispersant and the like, if desired, 25 are added.

Illustrative examples of the antioxidant which can be incorporated into the product of this invention include 2,6-di-tert-butyl-p-methylphenol, n-octadecyl-3- (4-hydroxy-3,5-di-tert-butylphenyl) propionate, tetrakis / methylene-3- (3,5-di-tert-buty 1-4-hydroxyphenyl) -propionate-methethane, etc. However, these antioxidants cause yellowing of the resins when exposed to radiation. Therefore, there is a limitation on the amount of antioxidant that can be included in the product of the invention.

.... ............ _ ______ _______ It is also possible to use 8500696 * ft - 8 - of a sulfur type antioxidant such as pentaerythritol-tetrakis (β- lauryl thiopropionate), dilauryl dithiopropionate or the like. However, such a sulfur type antioxidant causes hemolysis difficulties. Therefore, its application should be limited.

As representative ultraviolet light absorbers, mention may be made of 2-hydroxy-4-n-octoxy-benzophenone, 2- (2-hydroxy-3,5-di-tert-butylphenyl) -5-chlorobenzotriazole, etc.

As the typical ultraviolet light stabilizer, mention can be made of bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate.

The product according to the invention is preferably prepared in the following manner. The polypropylene-15 resin (a), the sorbitol derivative (b) represented by the formula 1, the phosphite compound (c) represented by the formula 2, and the polyamine compound (d) represented by the formula 3 and, optionally, the organic peroxide (e), as well as additives commonly used in the art, for example, a neutralizing agent, such as calcium tearate, nucleating agent, antioxidant, ultraviolet light absorber, ultraviolet light stabilizer, and the like, all are mixed in a mixer, such as a Henschel mixer, to disperse uniformly. The resulting mixture is then melted and pelleted using an extruder (extruder).

If desired, the product of this invention containing the polypropylene resin, the sorbitol derivative, the phosphite compound and polyamine compound can then be subjected to thermal degradation at a temperature of 190-270 ° C in the presence of an organic peroxide. This thermal degradation can be accomplished by adjusting the melt extrusion temperature at the above pelletization step within the above range. Temperatures below 190 ° C will be unsuitable for the melting and mixing of the product 8500696 * #.

- 9 - (mixture). On the other hand, the use of temperatures above 270 ° C is not preferred, because such higher temperatures will lead to deterioration and discoloration of the resin.

The polypropylene resin product of this invention has an extremely high radiation resistance and also a super transparency. Using these properties, it can be used effectively for food packaging, medical devices (syringes, needle bases, protective materials (protectors), etc.), drug containers and other applications. Furthermore, the thermally degraded product has excellent flowability.

The present invention will be described more specifically below with reference to the following examples of this invention and comparative examples.

However, the examples are illustrative of the invention only and do not limit it in any way.

Example I

To 100 parts by weight of a disordered ethylene-propylene copolymer containing 3.5% by weight of ethylene, and having an intrinsic viscosity of 1.62, as measured in tetralin of 135 ° C, were added 0.3% by weight. parts of 1,3,2,4-di (ethyl-benzylidene) sorbitol, 0.02 parts by weight of tris (2.4-di-tert-butyl-phenyl) -phosphite, 0.02 parts by weight of a polyamine compound represented by the general formula 3, and with an average molecular weight of 1800-2200, and 0.07 part by weight of calcium stearate. The resulting mixture was then mixed and then pelleted at an extrusion temperature of about 240 ° C using a conventional extruder. Using an injection molding machine, the thus prepared pellets were molded at an injection molding temperature of about 240 ° C into a sheet 160 mm long, 80 mm wide and 1 mm thick.

After exposing the plate obtained above to 2.5 Mrad γ rays from a cbbalt-60 radiation 8500696-10 plate, the plate was allowed to stand in an atmosphere of 80 ° C for 2 weeks.

The shock resistance, transparency and yellowing discoloration of the plate were examined both before and after exposure (to the radiation).

The shock resistance was measured by placing the plate on a pipe with an inner diameter of 50 mm, attaching a shock core with a diameter of 1.27 cm to the plate and then dropping a weight from above on it. The shock resistance was expressed in terms of the shock energy corresponding to the height at which the plate was broken.

Transparency was measured using a technical turbidimeter (procedure ASTM D-1QQ3 was followed).

The yellowing discoloration was determined visually based on the following four-level standard: No yellowing discoloration was observed. 20: some yellowing discoloration was observed.

Δs a yellowing discoloration was observed.

If severe yellowing discoloration was observed.

The results are shown in Table A.

Example II

The procedures of Example I were repeated with the exception that the levels of tris (2,4-di-tert-butylphenyl) phosphite and the polyamine compound were increased to 0.05 parts by weight and 0.05 parts by weight, respectively. Ir

The results of the measurement of the physical properties of the plate thus obtained are shown in Table A.

Example III

The procedures of Example I were repeated with the exception that the levels of tris (2.4-8500696-11-di-tert-butylphenyl) phosphite and the polyamine compound were increased to 0/08 parts by weight and 0, respectively. , 08 wt. dl.

The results of the measurement of the physical properties of the plate thus obtained are shown in Table A.

Comparative example X

The procedures of Example X were repeated with the exception that 0.1 part by weight of tetrakis / methyl-10-lene-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate-7-methane was added in place of the use of tris (2,4-di-tert-butylphenyl) phosphite and the polyamine compound.

The results of the measurement of the physical properties of the plate thus obtained are shown in Table A.

Its radiation resistance was inferior to that of the products of the invention. Comparative Example II

The procedures of Example III were repeated with the exception that 1,3,2,4-di (ethylbenzylidene) sorbitol was not used.

The results of the measurement on the physical properties of the plate thus obtained are shown in Table A.

Its radiation resistance was good, but its transparency was low.

Comparative Example III

The procedures of Example III were repeated with the exception that the polyamide compound was not used.

The results of the measurement of the physical properties of the plate thus obtained are shown in Table A.

Its radiation resistance was inferior to that of the products of the invention.

8500696 - 12 -

Comparative example IV

The procedures of Example III were repeated with the exception that tris (2,4-di-tert-butylphenyl) phosphite was not used.

The results of the measurement of the physical properties of the plate thus obtained are shown in Table A.

Its radiation resistance was inferior to that of the products of the invention.

10 Comparative example V

A plate was prepared in the same manner as in Example III with the exception that 0.1 parts by weight of tetrakis / methylene-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate / methane instead of the polyamine compound 15 was used.

The results of the measurement of the physical properties of the plate thus obtained are shown in Table A.

The plate developed a severe yellowing discoloration immediately after its exposure to radiation.

Comparative Example VI

A plate was prepared in the same manner as in Example III, except that 0.1 part of 25 bis (2.2.6.6-tetramethyl-4-piperidyl) sebacate was used in place of the polyamine compound.

The results of the physical properties measurement are shown in Table A.

Its radiation resistance was inferior to that of the products of the invention.

Comparative Example VII

A plate was prepared in the same manner as in Example III with the exception that 0.1 parts by weight of a dimethyl succinate / 2- (4-hydroxy-2,2,6,6-tetramethyl-35-piperidyl) ethanol condensation product was used in instead of using 1,3,2,4-di (ethylbenzylidene) - 8500696 - 13 - sorbitol and the polyamine compound.

The results of the measurement of their physical properties are shown in Table A.

The radiation resistance thereof was good, 5 but the transparency was low.

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Example IV

To 100 parts by weight of a disordered ethylene-propylene copolymer containing 3.5% by weight of ethylene, and having an intrinsic viscosity of 1.62, as measured in 135 ° C tetralin, were added 0.3% by weight. dl of 1,3,2,4-di {ethylbenzylidene) sorbitol, 0.08 parts by weight of tris- (2,4-di-tert-butylphenyl) phosphite, 0.08 parts by weight of a polyamine compound represented by the general formula 3, and with an average molecular weight of 1800-2200, 10 and 0.02 parts by weight of 2,5-dimethyl-2,5-bis (tert-butylperaxy) hexane, as well as 0.07 parts by weight of calcium stearate. The resulting mixture was then mixed and then pelleted through a conventional extruder at an extrusion temperature of about 240 ° C. Using an injection molding machine, the thus prepared pellets were formed at an injection molding temperature of about 240 ° C into a plate 160 mm long, 80 mm wide and 1 mm thick.

On the other hand, the melt flow index of the 20 pellets was measured according to procedure ASTM D-1238.

After the exposure of the plate obtained above to 2.5 Mrad γ rays from a cobalt-60 radiation source, the plate was allowed to stand in an atmosphere of 80 ° C for 2 weeks.

The shock resistance, transparency and yellowing discoloration of the plate were examined both before and after exposure in the manner described in Example X.

The results are shown in Table B.

30 Example V

The procedures of Example IV were repeated with the exception that the levels of tris (2,4-di-tert-butylphenyl) phosphite and the polyamine compound were reduced to 0.05 parts by weight and 0.05 parts by weight, respectively. dl.

The test results are shown in table 8500696 - 16 - call Β »

Example VI

The procedures of Example IV were repeated with the exception that the levels of tris (2.4-5 di-tert-butylphenyl) phosphite and the polyamine compound were changed to 0.02 parts by weight and 0.02 parts by weight, respectively. .

The test results are shown in Table Ξ ..

Comparative Example VIII

The procedures of Example IV were repeated with the exception that 0.1 part by weight of tetrakis / methylene-3- (3,5-di-tert-butyl-4-hydroxyphenyl) prop ionic acid-7-methane was added instead of the use of tris (2,4-di-tert-butylphenyl) phosphite and the polyamine compound.

The test results are shown in Table B.

Its radiation resistance was inferior to that of the products of the invention.

Comparative Example IX

The procedures of Example IV were repeated with the exception that 1,3,2,4-di (ethylbenzylidene) sorbitol was not used.

The test results are shown in Table B.

'The radiation resistance was good, but the transparency was low.

Comparative example X

The procedures of Example IV were repeated with the exception that the polyamine compound was not used.

The test results are shown in Table B.

Its radiation resistance was inferior to that of the products of the invention.

8500696 - 17 -

Comparative example XI

The procedures of Example IV were repeated with the exception that tris (2,4-di-tert-butylphenyl) phosphite was not used.

The test results are shown in Table B.

Its radiation resistance was inferior to that of the products of the invention. Comparative Example XII

10 The. procedures of Example IV were repeated except that 0.1 part by weight of tetrakis / methylene-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate-7-methane was used instead of the poly amine compound.

The test results are shown in Table B.

The product developed a severe yellowing discoloration immediately after its exposure to radiation.

Comparative Example XIII

The procedures of Example IV were repeated with the exception that 0.1 parts by weight of bis (2.2.6.6-tetramethyl-4-piperidyl) sebacate was used in place of the polyamine compound.

The test results are shown in Table B.

Its radiation resistance was inferior to that of the products of the invention. Comparative example XIV

The procedures of Example IV were repeated except that 0.1 part by weight of a dimethyl succinate / 2- (4-hydroxy-2,2,6,6-tetramethyl-1-piperidyl) -ethanol condensation product was used instead of using 1,3,2,4-di (ethylbenzylidene) sorbitol and the polyamine compound.

The test results are shown in Table B.

8500696 - 18 -

The radiation resistance thereof was good, but the transparency was low.

Example VII

The procedures of Example IV were repeated with the exception that the content of 2,5-dimethyl-2,5-bis (5-butylperoxy) hexane was changed to 0.04 parts by weight.

The test results are shown in Table C.

Example VIII

The procedures of Example IV were repeated with the exception that the content of 2,5-dimethyl-20-5-bis (5-butylperoxy) hexane was changed to 0.06 parts by weight.

15 The test results are shown in Table C.

For comparison, the MI value and other physical data of the pellets of the product of Example III are also shown in Table C.

The irradiation resistance of the product of this example did not differ from that of the other products of this invention, but the flowability of the pellets of the former product was somewhat inferior to that of the latter products.

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Claims (15)

1. A radiation-resistant polypropylene resin product with excellent transparency, characterized in that this product comprises (a) a polypropylene resin, (b) a sorbitol derivative of the general formula 1, wherein R is a hydrogen atom or an alkyl group with 1-18 carbon atoms, 10 (c) a phosphite compound of the general formula 2, wherein R 1 represents a tertiary butyl, 1,1-dimethylpropyl, cyclohexyl or phenyl group and R 1 represents a hydrogen atom or a methyl, tertiary butyl, 1,1-dimethylpropyl, cyclohexyl or phenyl group, and 15 (d) a polyamine compound of general formula 3, wherein n represents an integer from 1 to 40 on average, the contents of the compounds ( b), (c) and (d) 0.005-8 parts by weight, 0.01-4 parts by weight and 0.01-4 parts by weight, respectively, all based on 100 parts by weight of the polypropylene resin (a) , to be. A radiation-resistant polypropylene resin product according to claim 1, characterized in that it further comprises (e) an organic peroxide. A radiation-resistant polypropylene resin product according to claim 1, characterized in that the resin product is thermally degraded at a temperature of 190-270 ° C in the presence of an organic peroxide. A radiation-resistant polypropylene resin product according to claim 1, characterized in that the polypropylene resin polypropylene homopolymer, a propylene-ethylene copolymer with an ethylene content of 0.1-7% by weight or a propylene-ct olefin copolymer having an α-olefin content of 0.1-20% by weight. A radiation-resistant polypropylene resin product according to claim 1, characterized in, 850 0 6 9 & * -η - that the sorbitol derivative (b) dibenzylidene sorbitol, 1,3,2,4-di (methylbenzylidene) sorbitol or 1.3,2.4- di (hexyl-benzylidene) is sorbitol. 6. A radiation-resistant polypropylene resin product according to claim 1, characterized in that the content of the sorbitol derivative (b) is 0.05-1 parts by weight per 100 parts by weight of the polypropylene resin. A radiation-resistant polypropylene resin product according to claim 1, characterized in that the phosphite compound (c) tris (2,5-di-tert-butylphenyl) -phosphite, tris (2-tert-butylphenyl) phosphite , tris / 2- (1,1-dimethyl-propyl) phenyl / phosphite, tris (2-phenylphenyl) phosphite, tris (2-cyclohexylphenyl) phosphite, tr is (2,4-di-tert-butylphenyl) -phosphite or tris (2 -tert.-butyl-4-phenyl) phosphite. A radiation-resistant polypropylene resin product according to claim 1, characterized in that the content of the phosphite compound (c) is 0.02-2 parts by weight per 100 parts by weight of the polypropylene resin (a). A radiation-resistant polypropylene resin product according to claim 1, characterized in that the content of the polyamine compound (d) is 0.02-2 parts by weight per 100 parts by weight of the polypropylene resin (a). 10. A radiation-resistant polypropylene resin product according to claim 2, characterized in that the organic peroxide (e) tert. -butyl peroxypivalate, lauroyl peroxide, benzoyl peroxide, cyclohexanone peroside, tert.-butyl peroxyisopropyl carbonate, tert-butyl peroxybenzoate, methyl ethyl ketone peroxide, dicumyl peroxide, 2,5-dimethyl-2-tert-hexane-butyl. 2,5-dimethyl-2,5-di (tert-butylperoxy) -hexyn-3. 11. A radiation-resistant polypropylene resin product according to claim 3, characterized in that the organic peroxide (e) tert-butyl peroxypivalate, lauroyl peroxide, benzoyl peroxide, cyclohexanone peroxide, tert-butyl peroxyisopropyl carbonate, tert. -butyl peroxybenzoate, 85006S6 * -23 - 1 methyl ethyl ketone peroxide, dicunyl peroxide, 2,5-dimethyl-2,5-di- (tert-butylperoxy) hexane, di-tert. -butyl peroxide or 2,5-dimethyl-2,5-di (tert-butylperoxy) -hexyn-3. 12. Use of a radiation resistant polypropylene resin product as defined in claims 1-11 for food containers. Use of a radiation resistant polypropylene resin product as defined in claims 1-11 for drug containers. Use of a radiation-resistant polypropylene resin product as defined in claims 1-11 for medical instruments. 15. Methods and products, including articles, as described in the description and / or examples. 20 85 0 0 69 6