Polymer composition

 

(57) Abstract:

Use: medical products, resistant to sterilization conditions. The inventive composition includes 100 hours of a copolymer of vinyl chloride (I) 3,4 - 9,0 hours of thermo stabilizer. Copolymer I get grafted copolymerization I on a copolymer of ethylene with 10 - 32% vinyl acetate, it contains 15 - 55% I and has a MFR of 7.5 - 175,0 g/10 min Copolymerization is carried out in suspension in the presence of a suspension stabilizer and initiator solution, synthesized before the introduction I directly in the polymerization zone interaction chloroformiate with hydrogen peroxide (1:2 mol/mol). table 1.

The invention relates to polymeric compositions based on thermoplastic elastomer grafted copolymer of vinyl chloride (I) a copolymer of ethylene-vinyl acetate (EVA) for medical products that do not contain low molecular weight plasticizer, characterized by increased flexibility, transparency, resistance to various types of sterilization.

Usually for medical devices used plasticized polyvinyl chloride (PVC). The most versatile of the plasticizer di-2-ethylhexylphthalate (DOP). The main nedostatkama, extraction, migration from products in contact environment (water, chromosonal); however, there may be cases falling traces of plasticizer in the human body. In recent years appeared in the literature information on the potential Carcinogenicity DOP. In this regard, in the present medical devices appropriate to apply thermoplastic elastomers, the use of which instead of the polymer and plasticizer would provide similar materials.

Known grafted copolymer containing 15 to 70 wt. I synthesized by adding 1/3 of the total number of I to latex EVA copolymer with a content of 30 to 70 wt. E.

Grafted copolymer I get in the presence of latex EVA copolymer containing 20 to 70 wt. E. the Number of input added during polymerization is 50 to 95 wt.

The polymerization is carried out at a temperature of 0 45oC.

Grafted copolymer I get and suspension polymerization. Copolymers I have a high transparency. Improved processability are characterized by grafted copolymers REF. They are grafted polymerization of I at 0 70oC in the presence of EVA copolymer with a content of 30 to 65 wt. E without dissolving sprinklers the stew, get grafted polymerization of 10 to 250 wt.h. When I 20 100oC in the presence of 100 wt.h. the EVA copolymer with a content of 40 to 70 wt. E.

Elastic graft copolymer I with good processability and transparency, containing 70% EVA copolymer, get the suspension graft copolymerization at 40 90oC 30 85 h. I 15 70 wt. hours of EVA copolymer (the content of e 35 to 75 wt.). These grafted copolymers I get in the presence of radical polymerization initiators, for example peroxides of lauroyl, benzoyl, azodiisobutyronitrile.

When developing compositions based on thermoplastic elastomers that do not contain plasticizer and used for medical products, an important indicator is the elasticity. The film is more elastic, the lower the absolute value of the indicator 100% of module (ultimate tensile stress at 100% elongation.

In the processing of compositions based on thermoplastic elastomers methods of injection molding and extrusion, it is important to know their turnover, defined melt flow index equal to the weight of the composition flowing through the calibration nozzle device for a certain time at a certain load and temperature.

Famous which contains, wt.h. 100 grafted copolymer I, 100 copolymer e and 5 to 70 wt. VA, 0.01 to 5 magnesium oxide and/or calcium.

Also known polymer composition used for the manufacture of medical vessels. The polymer composition contains a resin obtained by copolymerization of 100 wt.h. the EVA copolymer (5 to 70 wt. VA) 60 900 wt.h. REF.

Polymer compositions are characterized by the following properties: 100% modulus is 150 155 kgf/cm2the melt flow index of 5 to 5.5 g/10 min.

Closest to the technical essence and the achieved effect to the present invention is a polymer composition for the manufacture of bags for blood. The composition comprises: 100 wt.h. product vaccinations on a copolymer of 30 to 80% VA with ethylene, vinyl chloride, or mixtures thereof, with copolymerizing monomers by suspension method at 50 70oC in the presence of radical initiators for the polymerization, 0.5 to 3 wt.h. calcium zinc compounds, 0.1 to 5 wt.h. amide of the formula RC(O)NH2(R is a saturated hydrocarbon radical C5-C29and 3 5 epoxidizing soybean oil (EFM). 100% modulus polymer composition is 140 145 kgf/cm2the melt flow index of 6 to 6.5 g/10 min (see table 14).

Technical ie processing AIDS (increase of melt flow index) of the polymer composition.

For this polymer composition comprising a copolymer I with ethylene and vinyl acetate and thermo stabilizer, as a copolymer of I contains a grafted copolymer of 15 to 55 wt. I on a copolymer of ethylene with vinyl acetate content in the last 10 to 32 wt. vinyl acetate and a melt flow index of 7.5

175 g/10 min in the following ratio, wt.h.

Specified grafted copolymer BX 100

Thermo stabilizer 3,4 9

Grafted copolymer I was obtained as follows.

In the reactor-polymerization capacity of 20 liters, equipped with a thermostatic jacket, impeller stirrer and a universal regulator of speed, load 2.5 kg of EVA copolymer containing 10 32% VA, 10 kg of demineralized water containing 0,01 0,06% (from water) dispersant (PVA or methylcellulose derivatives), 1 to 1.5 g of NaOH, 1.5 to 2.0 g of hydrogen peroxide (28%). Then download the 3.5 4.8 g of 2-ethylhexylcarbonate and mix the contents of the reactor for 45 min at room temperature. Download carbon tetrachloride (1 3% I), 300 2500 g I increase the temperature to 54oC carry out the synthesis of the graft copolymer to a given composition, which controls the pressure drop in the reactor. Blow out the residual I, conduct the distillation of volatile when the rate is oC and examined for the content of the mass fraction of chlorine (GOST 25303-82). The melt flow index of the copolymer of 7.5 175 g/10 min.

As thermo stabilizer composition comprises a mixture of calcium stearate (Stsa THE 6-09-4104-85), zinc stearate (Zn THE 6-09-4262-86) and the EFM 6-10-722-77.

Comparative analysis of the proposed technical solutions to the prototype allows to conclude that the proposed polymer composition is different from the known use in the composition of the grafted copolymer I-EVA with a certain amount of grafted I 15-55% and a melt flow index of the copolymer of 7.5 175 g/10 min, obtained as described above. I.e. the proposed solution meets the criterion of "novelty". The analysis of other known polymer compositions showed that a sign that distinguish the claimed technical solution is not revealed in these inventions, and such properties, showing the proposed polymer composition as improved processability and flexibility, significantly higher than similar properties in the known technical solutions. This allows, according to the authors, to make a conclusion on the conformity of the proposed solutions to the criterion of "inventive step".

Use luceat elasticity films: 100% module 30 115 kgf/cm2the melt flow index of the composition 15 130 g/10 min (see table of examples 1 to 13).

Example 1. In the mixer load, wt.h. 100 copolymer I-EVA (the content of grafted BX 15% ratio e and BA in the copolymer 90:10, the melt flow index (MFR) of 18 g/10 min), 0.75-Stsa, 0,15 Zn and 5 EFM, is stirred at a temperature of 60 70oC 20 30 min and unload. From the song, roll film thickness of 0.5 to 0.05 mm at a temperature of 100oC for 10 min and GOST 11262-80 determine the ultimate tensile stress at 100% elongation (100% modulus), GOST 11645-73 determine the melt flow index.

Examples 2 to 13 according to the invention, example 14 for comparison. The compositions and properties of the polymer compositions shown in the table. The method of preparation of the compositions and methods of tests similar to that shown in example 1.

From the table it is seen that the use in the composition of the proposed polymer composition grafted copolymer of 15 to 55 wt. I on the EVA copolymer with a content of 10 to 32 wt. VA and MFR of 7.5 175 g/10 min, obtained as described in the application method, increases the elasticity of the films: the 100% modulus is 30 -115 kgf/cm2the melt flow index of songs 15 of 130 g/10 m is 5 wt. or with the VA content in the EVA copolymer is less than 10 wt. and more than 32 wt. or on the basis of the grafted copolymer I obtained in the presence of a conventional radical initiators, it is difficult recycled and do not allow to obtain a material with good properties.

Polymer composition comprising a copolymer of vinyl chloride with ethylene and vinyl acetate and thermo stabilizer, characterized in that as a copolymer of vinyl chloride with ethylene and vinyl acetate, it contains a grafted copolymer of vinyl chloride on ethylene copolymer with 10 to 32 wt. vinyl acetate content of vinyl chloride 15 to 55 wt. the grafted copolymer and the melt flow index of 7.5 175,0 g/10 min, obtained by suspension copolymerization of vinyl chloride and a copolymer of ethylene with vinyl acetate in the presence of a suspension stabilizer and initiator solution, synthesized before the introduction of vinyl chloride directly into the polymerization zone interaction chloroformiate with hydrogen peroxide in aqueous alkaline medium at a molar ratio of chloroformiate and alkali 1:2, in the following ratio, wt.h.

Specified grafted copolymer of vinyl chloride 100

Thermo stabilizer 3,4 9,0 C

 

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