DE2520229A1 - Frosted translucent PVC containers by blow extrusion - using PVC mix having low filler content and no plasticiser - Google Patents

Abstract

Process is claimed for producing hollow bodies and containers with a frosted effect from a PVC moulding compsn., the compsn. contg. vinyl chloride homo- or copolymerisers of K value 55-65 pref. 58-61 and contg. stabilisers, lubricants and opt pigments, plasticisers and reinforcing agents. etc. The process comprises moulding the compsn. at 170-240 (180-220) degrees C to obtain a frosted or icy effect on the hollow body using a blow extruding or deep drawing technique and finally cooling.

Description

Process for the production of hollow bodies, containers and the like.

The present invention relates to a method for producing Hollow bodies, containers and the like. With a frost or ice effect using a polyvinyl chloride molding compound, with which crystal clear to transparent during blow extrusion Hollow bodies can be produced. The one used in the polyvinyl chloride molding compound Vinyl chloride homo- and / or copolymer is plasticizer-free or low-plasticizer, has a K value between 55-65, preferably 58-61, and contains besides Stabilizers and lubricants, possibly pigments, plasticizers and one or more Impact strength-improving components, the polyvinyl chloride molding compound in addition a certain, very small amount of a propellant per 100 parts by weight of polyvinyl chloride and / or small amounts of up to 4 parts by weight of a finely divided talc and / or certain amounts by weight of a pulverulent vinyl chloride homo- and / or copolymer with a K value above 65, preferably above 70. According to the invention This molding compound is made after mixing the ingredients to achieve this process a frost or ice effect of hollow bodies at a temperature of approx. 170 -ca. 2400 C, preferably 180-2200 C, using the blow extrusion process or processed according to the deep-drawing process and subsequently those produced in this way Cooled hollow body.

It is already known to use bottles, cans and the like. B. Perfume bottles, To provide beverage bottles, etc. with a surface coating that can be used in a or several additional work steps applied to the bottle or can or is sprayed on to achieve certain surface effects. The disadvantage of such Coatings exist in addition to the additional work steps of the application process that such coatings can easily come off or that additional binding, Swelling agents or other surface coating agents prior to application of the Coating must be used.

In the CA-PS 773 156 was therefore to produce an opalescent or mother-of-pearl-like effect proposed, per 100 parts by weight of a vinyl chloride homo- or copolymers about 80-180 parts by weight of a certain talc as filler of a certain hardness and shape to be added. When processing these with a high content of fillers However, polyvinyl chloride molding compounds have difficulties due to the high Filler content are conditional, especially if such molding compounds after the process the blow extrusion are to be processed. Furthermore, these molding compounds must be a A higher proportion of plasticizers can be added so that processing can take place at all can. The method is therefore not for plasticizer-free or low-plasticizer Polyvinyl chloride suitable. In addition, the high content of talc does not a frost or

Ice effect, but rather an opalescence in the form of a cloudiness.

It is also known, the polyvinyl chloride for the production of To add chemical blowing agents to foam parts in amounts by weight of 0.5-3% by weight (see DT-OS 2 256 o) 6). However, after this procedure there are no frost or ice effects obtained, but molded parts with foam structure, so that the strength the molded parts is greatly reduced.

The aim and object of the present invention was therefore to provide a method For the production of hollow bodies, containers and the like. That have a frost or ice effect have to be found, avoiding the aforementioned disadvantages. The procedure should enable low-plasticizer or plasticizer-free polyvinyl chloride molding compounds processed in this way by the blow extrusion process or by the deep-drawing process can be that those produced using the process of the invention Hollow bodies have the desired frost or ice effect. In addition, should the grip of the hollow body can also be improved.

According to the invention it was found that hollow bodies, containers and the like. with a frost or ice effect, advantageously using a polyvinyl chloride molding compound, with which crystal clear to transparent hollow bodies are achieved during blow extrusion, can be produced. The vinyl chloride homo- and / or copolymer should be plasticizer-free or low-plasticizer, one K value between 55-65, preferably 58-61, and can in addition to stabilizers and lubricants, possibly pigments, Plasticizers as well as one or contain several impact strength-improving components.

The vinyl chloride homo- or copolymer can after the suspension, bulk or optionally also after be made by the emulsion process.

The inventive method consists in that this polyvinyl chloride molding compound Per 100 parts by weight of polyvinyl chloride, 0.01-0.05 parts by weight, preferably 0.020 - 0.055 parts by weight of a propellant, which is in the presence or absence a kick substance decomposed at over 1700 C, and / or 0.5-4 parts by weight, preferably 1.5 - 2.5 parts by weight of a finely divided talc and / or 3 - 30 parts by weight, preferably 10-20 parts by weight, of a pulverulent vinyl chloride homo- and / or copolymers with a K value above 65, preferably above 70, the K value is at least 5 points, preferably 10 or more than 10 points, higher than that Contains the K value of the polyvinyl chloride in the polyvinyl chloride molding compound used, wherein the molding compound after mixing the ingredients for the production of a frost or ice effect of hollow bodies, at a temperature of about 170 -ca. 2400 C, preferably 180-2200 C, according to the blow extrusion process or according to the deep-drawing process processed and then cooled.

According to one embodiment, the process is used as polyvinyl chloride a plasticizer-free or low-plasticizer Suspension vinyl chloride homopolymer with a K value of 55-65, preferably 58-61, is used, which is per 100 parts by weight Polyvinyl chloride D - 30 parts by weight, preferably 10-20 parts by weight of a powdery one Suspension vinyl chloride homopolymer with a K value above 65, preferably over 70, with the K value by at least 5 points, preferably 10 or more than 10 points, higher than the K value of the polyvinyl chloride in the polyvinyl chloride molding compound used, contains.

According to the invention, the molding compound is formed after the components are mixed likewise at a temperature of approx. 170 - approx. 2400 C, preferably 180 - 2200 C, processed by the blow extrusion process or by the deep-drawing process and then cooled. This embodiment has the advantage that a filler, z. B. the talc, does not need to be added at all, what for hollow bodies, for certain areas of application, e.g. B. impact modified hollow body, a certain Role can play.

According to another embodiment, polyvinyl chloride is used in the molding compound a plasticizer-free or low-plasticizer powdery suspension vinyl chloride homopolymer with a K value between 55-65, preferably 58-61, is used, which is 100 Parts by weight of polyvinyl chloride 0.01-0.05 parts by weight, preferably 0.020-0.035 Parts by weight of an organic chemical blowing agent, which is in the presence or decomposed in the absence of a kick substance at over 1700 C, preferably azodicarbonamide and / or 0.5-4 parts by weight, preferably 1.5-2.5 parts by weight, of a finely divided Talc.

Here, too, the molding compounds are made after the components have been mixed at a temperature of approx. 170 - approx. 2400 ° C., preferably 180 - 2200 ° C., after Process of blow extrusion or processed by the deep-drawing process and then cooled down. The sole use of the propellant has the in some formulations Disadvantage that the frost or ice effect is not strong enough so that advantageously a combination of an organic chemical blowing agent with the finely divided one Talc is used in the specified amounts by weight. As talc is preferred a very finely divided microtalk was used.

According to an advantageous embodiment, however, a combination all three components are used, whereby the polyvinyl chloride is a plasticizer-free or low-plasticizer suspension vinyl chloride homopolymer with a K value between 55-65, preferably 58-61, is used, the per 100 parts by weight of polyvinyl chloride 0.01-0.05 parts by weight, preferably 0.020-0.035 parts by weight of a propellant, which decomposes in the presence or absence of a kick substance at over 1700 C, preferably azodicarbonamide and 0.5-4 parts by weight, preferably 1.5-2.5 parts by weight, of a finely divided talc and 3 - 30 parts by weight, preferably 10 - 20 parts by weight, of a pulverulent suspension vinyl chloride homopolymer with a K value above 65, preferably over 70, with the K value by at least 5 points, preferably 10 or more than 10 points, higher than the K value of the polyvinyl chloride in the Polyvinyl chloride molding compound used contains. With this combination, the individual Components or additives each in a concentration (within the weight ranges) can be added. This molding compound is also after the mixing of the ingredients in a known mixing device z. B. a fluid mixer, at a temperature of approx. 170 - approx. 2400 C, preferably 180 -2200 C according to the blow extrusion process or the deep-drawing process to form hollow bodies processed and then cooled.

In the process, the molding compound is preferably free of plasticizers Polyvinyl chloride used. When using low-plasticizer polyvinyl chloride the plasticizer content should preferably be 20% by weight, based on polyvinyl chloride Do not exceed 5 wt. #, Based on polyvinyl chloride.

The mean particle size of the talc used should be less than 500 #un, preferably below 300mm. The talc can be up to 90% by weight, preferably up to 50 wt. ffi due to finely divided calcium carbonate with an average particle size below 500, preferably below 300, can be replaced. These are used as stabilizers used, which in principle allow the polyvinyl chloride in a crystal clear to transparent form. These include such stabilizers on the base of tin, lead, cadmium, calcium, zinc, phenylindole, aminocrotonic acid ester or Mixtures of these stabilizers.

The shape that is used to accommodate the hollow body is particularly advantageous is intended, pretreated beforehand by sandblasting.

The process is used in particular for the production of hollow bodies, Containers and the like with a frost and ice effect for use in the cosmetics industry.

Examples: Example 1: In a 75 l Henschel fluid mixer 9 kg of suspension PVC with a K value of 58, 1 kg of suspension PVC with a K value of 71, 100 g of one monohydric aliphatic alcohol with 16 to 18 carbon atoms, 20 g of a blueing masterbatch, Consists of 95 parts of S-PVC (K value 58) and 5 parts of ultramarine blue, 150 g of finely divided Presented talc and 2 g of azodicarbonamide, after starting the mixer from the stirring stage I switched to stirring level II, at 600 C 120 g of di-n-octyltin di- (isooctylthioglycolate) (as a stabilizer) added and mixed further up to 1200 C. The mixture was in cooled to 400 C in a separate, slow-running mixer and sagged.

Example 2: 7.5 kg of S-PVC were added to a 75 l Henschel fluid mixer with K value 58, 1.5 kg S-PVC with K value 71.1 kg of a resin based on MBS (methyl methacrylate-butadiene-styrene terpolymer) to improve the impact strength, 100 g of an acrylic-based processing aid, 100 g of a hardened castor oil, 30 g of montanic acid ester, 25 g of blueing masterbatch as in Example 1 and 5 g of bluing masterbatch, consisting of 90 parts of S-PVC and 10 parts of ultramarine red, mixed with one another on stirring level I / II. At 600 C were 150 g of di-n-octyltin di (isooctylthioglycolate) (as a stabilizer) added and up to 1200 C mixed. The mixture was cooled to 400 ° C. in the cooling mixer while stirring and sagged.

Example 3: 5 kg of S-PVC were added to a 15 l Papenmeier fluid mixer with a K value of 58, 50 g of finely divided talc, 1.25 g of azodicarbonamide, 50 g of C 16 - C 18 - Alcohol and 7.5 g of bluish masterbatch (from 95 parts of S-PVC plus 5 parts of ultramarine blue produced) mixed up to 600 C, then mixed with 50 g of tin stabilizer as above and mixed up to 1200 C. After cooling to 400 ° C., the mixture was sagged.

The processing of the molding compositions produced according to Examples 1-3 took place on a blow extrusion line from Maschinenfabrik Bekum, Type Bekum BA 3, with 50 mm screw diameter and 20 D screw length to 0.5 bottles under Maintain a temperature of approx. 170 - approx. 2400 C, preferably 180 - 2200 C. All bottles produced within the processing tests showed the desired frost or ice effect.

Claims (11)

Patent claims: Process for the production of hollow bodies, containers and the like. From a polyvinyl chloride molding compound, with which crystal clear to transparent during blow extrusion Hollow bodies can be produced, with that in the polyvinyl chloride molding compound Vinyl chloride homo- and / or copolymers used, free of plasticizers or low in plasticizers is, has a K value between 55 - 65, preferably 58 - 61 and in addition to stabilizer (s) and lubricant (s), optionally pigments, plasticizers and one or more Contains impact strength-improving components, characterized in that the Polyvinyl chloride molding compound per 100 parts by weight of polyvinyl chloride 0.01 - 0.05 parts by weight, preferably 0.020-0> 035 parts by weight of a propellant which is in the presence or decomposed in the absence of a kick substance at over 1700 C, and / or 0.5 - 4 parts by weight, preferably 1.5-2.5 parts by weight, of a finely divided talc and / or 3 - 30 parts by weight, preferably 10-20 parts by weight, of a powdery Vinyl chloride homo- and / or copolymers with a K value above 65, preferably over 70, with the K value at least 5 points, preferably 10 or more than 10 points, is higher than the K value of the polyvinyl chloride in the used Polyvinyl chloride molding compound, the molding compound after mixing the ingredients to achieve a frost or ice effect of hollow bodies at one temperature from approx. 170 - approx. 2400 ° C., preferably 180 - 2200 ° C., using the blow extrusion process or processed according to the deep-drawing process and then cooled. 2. The method according to claim 1, characterized in that in the molding compound as polyvinyl chloride, a plasticizer-free or low-plasticizer bulk or suspension vinyl chloride homopolymer and / or copolymer with a K value between 55 - 65, preferably 58 - 61, is used, the 100 parts by weight of polyvinyl chloride 3 - 30 parts by weight, preferably 10-20 parts by weight, of a pulverulent bulk or suspension vinyl chloride homopolymer and / or copolymers with a K value above 65, preferably above 70, where the K value at least 5 points, preferably 10 or more than 10 Points, is higher than the K value of the polyvinyl chloride in the polyvinyl chloride molding compound used, contains. 3. Process according to Claims 1 and 2, characterized in that in the molding compound as polyvinyl chloride a plasticizer-free or low-plasticizer Suspension vinyl chloride homopolymer with a K value between 55-65, preferably 58 - 61, is used that per 100 parts by weight of polyvinyl chloride 3 - 30 parts by weight, preferably 10-20 parts by weight, of a pulverulent suspension vinyl chloride homopolymer with a K value above 65, preferably above 70, with the K value at least 5 - approx. 20 points, preferably 10-15 points, higher than the K value of the polyvinyl chloride in the polyvinyl chloride molding compound used. 4. The method according to claim 1, characterized in that in the molding compound as polyvinyl chloride, a plasticizer-free or low-plasticizer bulk or suspension vinyl chloride homopolymer and or copolymer with a K value between 55-65, preferably 58-61, is used is that per 100 parts by weight of polyvinyl chloride 0.01-0.05 parts by weight, preferably 0.020-0.035 parts by weight, of a propellant which is in the presence or in Absence of a kick substance decomposes at over 1700 C, preferably azodicarbonamide and / or 0.5-4 parts by weight, preferably 1.5-2.5 parts by weight, of a finely divided Talc. 5. Process according to Claims 1 and 4J, characterized in that in the molding compound as polyvinyl chloride a plasticizer-free or low-plasticizer Suspension vinyl chloride homopolymer with a K value between 55-65, preferably 58-61, is used, which per 100 parts by weight of polyvinyl chloride 0.01-0.05 Part by weight, preferably 0.020-0.035 part by weight of an organic chemical Propellant that is in the presence or absence of a 6th Process according to Claim 1, characterized in that in the molding compound as polyvinyl chloride a plasticizer-free or low-plasticizer bulk or suspension vinyl chloride homopolymer and / or copolymer with a K value between 55 - 65, preferably 58 - 61, is used, which per 100 parts by weight of polyvinyl chloride 0.01 - 0.05 parts by weight, preferably 0.020-0.035 parts by weight of an organic chemical blowing agent, which decomposes in the presence or absence of a kick substance at over 170 OC, preferably azodicarbonamide and 0.5-4 parts by weight, preferably 1.5-2.5 parts by weight, of a finely divided talc and 3 - 30 parts by weight, preferably 10 - 20 parts by weight, a pulverulent bulk or suspension vinyl chloride homopolymerisates and / or copolymers with a K value above 65, preferably above 70, the K value is at least 5 points, preferably 10 or more than 10 points, higher than that K value of the polyvinyl chloride in the polyvinyl chloride molding compound used. Kick substance decomposed at over 170 ° C, preferably azodicarbonamide, and 0.5-4 parts by weight, preferably 1.5-2.5 parts by weight, of a finely divided Talc and 3 to 30 parts by weight, preferably 10 to 20 parts by weight, of a powdery one Bulk or suspension vinyl chloride homopolymer and / or copolymer with a K value over 65, preferably over 70, the K value at least 5 points, preferably 10 or more than 10 points higher than the K value of the polyvinyl chloride in the polyvinyl chloride molding compound used. 7. Process according to Claims 1 and 6, characterized in that in the molding compound as polyvinyl chloride a plasticizer-free or low-plasticizer Suspension vinyl chloride homopolymer with a K value between 55-65, preferably 58-61, is used, which per 100 parts by weight of polyvinyl chloride 0.01-0.05 Part by weight, preferably 0.020-0.035 part by weight of an organic chemical Propellant, which decomposes in the presence or absence of a kick substance at over 1700 C, preferably azodicarbonamide, and 0.5-4 parts by weight, preferably 1.5-2.5 Parts by weight of a finely divided talc and 3 to 30 parts by weight, preferably 10-20 parts by weight, of a pulverulent suspension vinyl chloride homopolymer with a K-value over 6 #, preferably over 70, whereby the K-value 5 - 20 points, preferably 10-15 points, higher than the K value of the polyvinyl chloride in the Polyvinyl chloride molding compound used contains. 8. The method according to claims 1, 4-7, characterized in that the mean particle size of the talc is below 500, preferably below 300 μm. 9. The method according to claims 1, 4-8, characterized in that the talc up to 90%, preferably up to 50%, through finely divided calcium carbonate with a particle size below 500 μm, preferably below 300 μm, is replaced. 10. The method according to claims 1-7, characterized in that as Stabilizers should be based on v @ n Zi @@, @@@@@ -Gadmium, Calcium, Zinc, Phenylind @@ e, @min @@@@ tonsau @@@@@@@@ or mixtures thereof can be used. 11. The method according to claims 1 - L, characterized .1, -that the mold for receiving the hollow @@@ is pretreated by v @@@ er @@@@@ sandblasting.