DE2257730A1 - THERMOPLASTIC COMPOSITION - Google Patents

Description

PATENT LAWYERS DR -ING. H. FlNCKE

DIPL.-ING.H BOHR lh. NOV. 1972

DIPL-1NÖ. S. STAtGER

MÖNCHEN 5 MOLLERSTR. 31

Imperial Chemical Induetries Limited, London,

Great Britain! Ehermoplastiaessön

The invention relates to xhermoplastic compositions.

The use of disposable packaging, containers and

309822/11

the like and the deliberate or accidental throwing away of these plastic items has that Plastic waste problem caused. The use of the plastic compositions according to the invention can alleviate these difficulties.

According to the invention contains a thermoplastic material as A free carboxylic acid and a decomposition aid Metal salt of a carboxylic acid, the metal having an atomic number of 22 to 29 and both of these Components are present in such an amount that

(a) the total amount of metal salt and free carboxylic acid between 0.001 and 40% by weight of the total mass matters and that

(b) the amount of free carboxylic acid 10 to 95% by weight, preferably 50 to 90% by weight, based on the Total amount of metal salt and free carboxylic acid.

The metals with atomic numbers from 22 to 29 are Ti, T ₁ Cr, Mn, Fe, Co, Ni and Cu. Among these, the metals iron and manganese are preferred.

The thermoplastic compositions described include both

- 3 309822/1100

ready-to-use hats ale also Eonsentrat ©, i.e. highly concentrated masses that are underneath the pure polymer Formation of a ready-made hatred may be added can. In the case of the ready-to-use masses, the Concentration (a) mostly 0.01 to 2%, preferably 0.1 to 1%. The mass can be a single polymer or contain a polymer mixture »

The free carboxylic acid preferably, but not necessarily, corresponds to the carboxylic acid metal salt In used In both cases, the carboxylic acid is preferably one with the formula R.COOH, where R is a hydrocarbon represents a group with up to 30 carbon atoms. Particularly suitable acids are those in which R is a straight-chain hydrocarbon group with 8 to 21 carbon atoms and with represents less than 3 double bonds.

The degradation aid according to the invention is suitable to accelerate the rate of degradation of, in particular, olefin polymers, copolymers of olefins and other monomers copolymerizable therewith as well as mixtures of olefin polymers and / odes? -copolymers »

Preferred olefin polymers are:

- 4 -. 309822/1100

O) homopolymers of ethylene, propylene, butene-1, 4-methylpentene-i and styrene;

(2) Copolymers of the above monomers with each other as well as with other α-olefins.

The preferred olefin copolymers consist of those which contain at least 50% by weight of ethylene, propylene, butene-1, 4-methylpentene-t and / or styrene together with at least contain one of the following comonomers in copolymerized form:

Vinyl chloride Vinyl acetate Methyl acrylate Methyl methacrylate Acrylic acid Methacrylic acid Bydroxyethyl methacrylate

The preferred olefin copolymers also include those Ionomers obtained by neutralizing or partially neutralizing the carboxylic acid groups of those Copolymers containing carboxylic acid groups are prepared.

309822/1100

Copolymers in which at least 50% by weight of ethylene are polymerized are particularly useful.

In addition to the polymer and the decomposition aid, one hater according to the invention can also use others for thermoplastic « contain a lot of common additives. With polyolefins Can the haters e.g. antiblocking agents, lubricants, stabilizers to stabilize the haters at theirs Processing and stabilizers ott stabilization the hate included in use (i.e. after processing).

The invention relates to packaging materials, string and containers (including container lids) made from the plastic compound as defined. Possible containers are, for example, bags, sacks, boxes _for cardboard boxes, bottles, perfume bags, cups and cartridge cases.

The invention also relates to an object of sale which is packaged in a material made of a plastic compound according to the invention.

In the following, several hats according to the invention are described in more detail, for example. In all examples, pulverulent isene (III) stearate and a pulverulent carboxylic acid or a liquid carboxylic acid were used

- 6 309822/1100

dissolved in an alcohol (in some cases also an antioxidant) ground with polyethylene. After the mixture was prepared, milling was continued for 10 minutes to produce a milled sheet. The Valzenfell was pressed between sheets of polyethylene terephthalate at a suitable temperature to form a continuous film 125 μm thick. Samples measuring 1 × 5 cm were cut from this film and tested in the FS / BL test.

FS / BL breakfast

The samples were exposed to UV rays from a combination of equal numbers of 20 watt fluorescent sun lamps and 20 watt black lamps irradiated. The samples circled around the lamps in a propriety Sound 10 cm from the lamps in order to achieve even irradiation. The rehearsals were daily examined and checked for bite formation when bending. The time to a positive result with this one Testing indicates the effectiveness of the breakdown aid, with a shorter time being a more effective breakdown aid indicates.

Table 1 shows the embrittlement times for

- 7 -309822/1100

FS / BL test on samples made of high pressure polyethylene nit the specified amounts of egg (XII) stearate (metal salt) and free stearic acid in days The table also shows the results for Testing samples that additionally contain 0.02% by weight BHT (a common name for the antioxidant 2,6-di-tert. -butyl-4 »methylphenol) are given.

Free acid
Weight% Table 1 % _t free
Acid im
total
degradation
middle Lifespan (days) with
0.02 wt%
BHT Metal salt 0.002 Total degradation
tools
6ev% 20th without
BHT - !
Weight% 0.102 0.01 93 23 11 | 0.008
0.008 0.02 0.11 20th 12th 13th 0.08 0.12 0.1 60 14th 15th 0.08 0.22 0.2 73 .- 6th 0.08 0.52 0.3 86.5 2 - 0.08 0.6 2

The control test (i.e. on high-pressure polyethylene without additives) showed an embrittlement time of 23 days.

Table 2 shows the corresponding results of low-pressure polyethylene with the specified amounts of iron (III) stearate (metal salt) and free stearic acid.

... 8 309822/1100

Table 2 Metallic Free Acids Total Degradation % Free Life

auxiliary acid im

- 'Geeemtn. >

Gew * Gew * Ge «* JjJttel ^Τβ * ^β

O 0 0 - 50 0.008 0.002 0.01 20th 35 0.08 0.02 0.1 20th 20th 0.20 0.0 0.2 0 24 0.10 0.10 0.2 50 19th 0.08 0.12 0.2 60 17th 0 0.20 0.2 100 35 0.08 0.22 0.3 73.4 15th 0.08 0.52 0.6 86.5 18th

The four results at 0.2 * total breakdown aid show that both the acid and the SaIs are effective as breakdown agents that the two together but have an increased effect »

Table 3 shows the results that when various other acids are added to the same basic mixture. In all In some cases the mixture contains:

. 9 -309822/1100

0.08 wt% isene (IIX) stearate 0.02 wt # stearic acid

0.1 wt% other acid (as indicated) (i.e. 0.2 wt% total degradation aid and free acid based on the bulk building aid)

Table 3 Art L @ b ©: aromatic nsclauer acid number of (T saturated age) C atoms saturated - 19th Benzoic acid 7th saturated. η. Feiargonic acid 9 1 double bond
containing 13th Lauric acid 12th 2 double bonds
containing 18th Stearic acid 18th saturated 15th Oleic acid 18th 18th Linoleic acid 18th 18th Behenic acid 22nd

From Table 3 it can be seen that the A ^ t of the radical B in the acids of the formula E. COOH, in which E is a hydrogen free radical ₉ "does not significantly influence" the rate of degradation.

An examination of the degradation of hangan stearate as a degradation aid

309822/11

With a content of 0.6 wt% manganese stearate and 1 wt% Stearic acid (i.e. a content of 1.6% total * degradation aids, of which 62% consisted of acid) the service life 2 days after the FS / KL-iest. Without acid the lifespan was 9 days. When using the Manganetearats made the polyethylene less colored than when using the iron salt.

The degradation-promoting effect of the synergistic Combination of 0.08% by weight isen (III) stearate and 0.02% by weight of stearic acid can be found in Table 4, in which the results of the above test on a number of thermoplastics are given.

Table 4

Thermoplastic lifetime in days.

with dismantling agent without dismantling agent

7.5% vinyl acetate / ethylene ♦ Polypropylene homopolymer · * SOHLYU®A 1555 ♦ ··

34 75 46 10 13th 71

- 11 -

309822/1100

Schmelsindex 2.0. Density 0.926 g / cm ^. The film was pressed to a thickness of 125 μια »

* ♦ The polypropylene was 0.1 % 0.1% 2,6-di-tert. -> butyl "4-methyl phenol © tabilieiert and below a tubular film with a strong 20 \ m blown at 220 ⁰ C.

*** A partially neutralized copolymer of ethylene and methacrylic acid that has been pressed into a film having a strength of 125 \ m '

- 12 309822/1100

Claims (1)

- 12 patent claims \ λ) Thermoplastic compound, in particular a polyolefin compound with, for example, polyethylene, which contains a metal salt of a carboxylic acid with an atomic number of metal from 22 to 29 as a decomposition aid, characterized in that the Hasse also contains a free carboxylic acid, the salt and the acid in such There are quantities that (a) the total amount of metal salt and free carboxylic acid between 0.001 and 40% by weight of the total mass matters and that (b) the amount of free carboxylic acid 10 to 95% by weight based on the total amount of metal salt and free carboxylic acid. 2. Thermoplastic composition according to claim 1, characterized in that the amount of free carboxylic acid 50 to 90% by weight based on the total amount of metal salt and free carboxylic acid. 3. Thermoplastmas se according to claim 1 or 2, characterized in that the free carboxylic acid as well the carboxylic acid from which the metal salt is derived - 13 -309822/1100 is, from the group of carboxylic acids of Eöitfiei B.GOOH, wherein H is a straight-chain hydrocarbon group with 8 to 21 carbon atoms and less than 3 Represents double bonds, is selected. 4- Thermoplastic compound according to claim 3, characterized in that that R represents the group 0 .., JEUc 5. Thermoplastic compound according to one of the preceding claims, characterized in that the same acid is chosen as the free carboxylic acid as the carboxylic acid, from which the metal salt is derived. 6. Thermoplastic compound according to one of the preceding claims, characterized in that iron or hangan is selected as the metal of the metal salt. 7. Thermoplastic compound according to one of the preceding claims, characterized in that the concentration (a) is between 0.01 and 2 wt #. PATENT LAWYERS IHt- (NG. H. FINCKü, D'Pl.-ING. H. ΒΟΗ « ..- ING. S. ί! Λ, · & ΐ.» 309822/1100