DD206783A1 - HIGH-EXPANSION POLYMERGEMIC - Google Patents

Abstract

NORBORNE COPOLYMERS AND ELASTICS WERE DEVELOPED BY HIGH-EXPANSION POLYMERGEMICS, WHICH ARE WELL PROCESSABLE AND DESIGNED AS CONSTRUCTION MATERIALS. THESE PROVISIONS ARE FULFILLED BY MIXTURES OF 90 TO 65% MASS NORBOBORN ETHYLENE COPOLYMERISATE, 10 TO 35% MASS OF A HIGH MOLECULAR WEIGHT ELECTRODE AND, IF APPROPRIATE, UP TO 100%. THE PARTICLE SIZES OF DISPERS DISTRIBUTED ELASPARTICLES ARE IN THE FIELD OF 1 TO 5UM. POLYMER COMBINATIONS OF THE TYPE DESCRIBED HEREBY APPLY AS MATERIALS FOR FORMKOERPERS EXPOSED TO HIGH IMPACT AND SHOCK PROBLEMS IN THE FIELDS OF ELECTRICAL ENGINEERING AND MACHINE AND VEHICLE MANAGEMENT.

Description

-1 ~ O ^ r ^ ^ ι

Ä. W o y y!

YSB Leuna-Werke Leuna, 11.11.1981

"Walter Ulbricht"

LP 81 101

Title of the invention High impact polymer blends

Field of application of the invention

The invention relates to polymer mixtures of horbornene Ethyieη-Kopolymereη and elastomers, which have high impact resistance and notched impact resistance »

The polymer mixtures are used in fields for which, in addition to high impact resistance and notched impact strength, high values of tensile strength, hardness, softening temperature are required.

Characteristic of the known technical solutions

It is known that urorbornene-ethylene copolymers are hard and brittle thermoplastics (US Pat. No. 2,799,668, British Pat. No. 777,414, DD-PS No. 109,224). Such thermoplastics have insufficient resistance to impact or impact stress. There are therefore limits to their use as mechanically loaded Porm bodies.

Furthermore, it is known that the impact resistance of horbornene-ethylene copolymers can be improved by modification with elastomers. According to DD-PS 129 799, mixtures of norbornene-ethylene copolymers and elastomers have an increased impact resistance compared with the unmodified ethylene-ethylene copolymers. High-impact polymer combinations of the! Jorbornene-ethylene copolymer are not known.

Object of the invention

The aim of the invention is the development of high-impact and readily processable polymer blends of horbornene-ethylene copolymers and elastomers *

Explanation of the essence of the invention

The invention has for its object to develop high-impact polymer mixtures of horbornene-ethylene copolymers and elastomers, which are used as construction materials ·

This object is achieved by high-impact polymer mixtures of horbornene-ethylene copolymers and elastomers, according to the invention, the mixtures 90 to 65% by mass norbornene ethylene copolymer, 10 to 35 mass%, preferably up to 25% by mass, of an elaston with high Molecular weight and optionally a gel content of up to 100%, 0.01 to 5% by mass, preferably 0.1 to 3% by mass, of a stabilizer or stabilizer mixture and / or 0.1 to 5% by mass of a lubricant.

Elastomers may include the blends with polybutadiene, elastomeric butadiene copolymers and terpolymers, natural rubber, polyisoprene, polyisobutylene, elastomeric ethylene copolymers and terpolymers, polychloroprene, acrylate rubber, chlorinated or chlorosulfonated polyethylene, silicone rubber, chlorohydrin rubbers, polyurea rubber,

Fluororubber, nitroso, Polyurethanelastoinere, Polypentenamer, high molecular weight butyl rubber and optionally a gel content up to 100 % or mixtures of these elastomers contain Iororbornene ethylene copolymers having a Horbornengehalt of 25 to 95 mol-SS, preferably 40 to 80 The high molecular weight elastomers with a gel content up to 100 % can be prepared in various ways, but preferably by suitable polymerization or by subsequent irradiation with electron or gamma rays or by addition of crosslinking agent. The increase in molecular weight and Occurrence of gel contents is indicated by an increase in the Mooney viscosity and / or a decrease in the melt index of the elastomers. The norbornene-ethylene copolymers used are products which are prepared from horbornene and ethylene with the aid of Ziegler mixed catalysts For applications which require increased heat distortion resistance, it is necessary to provide for the use of highly norbornene-containing copolymers.

The constituents of the polymer combinations are metered either vorgemisGht or individually in heatable kneading and then homogenized in the melt ·

The mixtures of elastomers and forbornene-ethylene copolymers are two-component systems for which a dispersed distribution of the soft elasto component in the matrix of the hard polymer is characteristic. It has proved to be advantageous if, in such multiphase systems, particle sizes of the slag phase in the range from 1 to 5 / In the incorporation of high molecular weight elastomers and optionally a gel content up to 100 % in lorbornene-ethylene copolymers, particle sizes range from 1 to 5 ^; / ** Hi and narrow particle size distribution ·

23539] 7

embodiments

example 1

From each 78-Ig Horbornen lthylen-copolymerizate, 21.5 ig in melt index and gel content of different Bthylen-vinyl acetate Kopolymerisaten with 30 to 35 mass $ vinyl acetate, 0.4 kg of a mixture of 4.4 ^f-thiobis ( 3-iaethyl-6-tert-buty! Phenol) and ß, ß'-thiodipropionic acid dilauryl ester and 0.1 ig calcium stearate four different mixtures are prepared · The starting components are thoroughly mixed in a high-speed mixer and then at a melt temperature of 503 K homogenized in an extruder with an average residence time of 3 minutes.

For the four different mixtures, the values of impact resistance are included in the table. As a comparison, pure orthorbornene ethylene copolymer was used.

The measures of impact strength used in the table are normalized quantities, for which the measured value of the pure norbornene ethylene copolymer was based on "1" ·

Example 2

84 g of lorbornene-ethylene copolymer and in each case 16 g of different styrene-butadiene copolymers in the gel fraction having a styrene content of 25 % are homogenized in a Brabender Plastograph at 473 K melt temperature. The two polymer mixtures are each processed into press plates, from which the test specimens be prepared for the determination of impact resistance. The values of the impact resistance are to be taken from the table «

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Example 3

8 kg of Forborn en-ethyl ene copolymer and 2 kg each in the Scamelzindex various ethylene-propylene-terpolymers terpolymeriaate be thoroughly mixed in a sonic mixer and then homogenized at 493 K melt temperature in an extruder ·

The impact strength values of the three mixtures can be taken from the table.

table

Polymermiachung Slast- Slast- relative 1 * melting gel blow index (Maase-%) toughness (g / 10 min / value J 463K) ς iJorbornen-ethylene -3 Kopolymeriaat - - 8th (Vergleichawert) 9 Mixtures of norbornene Ethylene Kopolymeri- 70 ο sat / ethylene Yinyl- 7 O acetate Kopolymeriaat / "s 10 ^ ' 0.6 3 Not 77 measurable IU Mixtures of horbornene Ί A 1 R Ethylene Kopolymeriaat / 14 1 ^ / Styrene-butadiene-co Go > 20 ^ polymeriaat Gemiache SOrbornen- TO Sthylen-Kopolymeriaat / / »^ Xthylen-propylene-diene A S terpolymer τ * ί vj * 0.7

unbroken

Claims (3)

- 7 - i V J J j Invention claim 1. High impact polymer blends of urorbornene-ethylene copolymers and elastomers, characterized in that the mixtures 90 to 65% by mass Uorbornen-Sthylen-Kopolymeriaate, 10 to 35% by mass, preferably 15 to 25% by mass, of a high elastic Molecular weight and optionally a gel content up to 100%, 0.01 to 5 mass%, preferably 0.1 to 3 mass%, of a stabilizer or stabilizer mixture and / or 0.1 to 5 mass% of a lubricant. 2 High-impact polymer mixtures according to item 1, characterized in that the mixtures as Slastkomponenten polybutadiene, elastomeric butadiene co- and terpolymer, natural rubber, polyisoprene, polyisobutylene, elastomeric ethylene co- and terpolymers, polychloroprene, acrylate, chlorinated or chlorosulfonated polyethylene , Silicone rubber, chlorohydrin rubber, polysulfide rubber, fluoroelastomers, nitrosocarbon polyurethane elastomers, polypentenamer, high molecular weight butyl rubber and optionally a gel content up to 100%, or mixtures of these elastomers. 3. High-impact polymer mixtures according to item 1, characterized in that the STorbornene ethylene copolymers contain from 25 to 95 mol%, preferably from 40 to 80,% by volume, of urorbornene.