Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1995-11-09
1998-05-19
Nagumo, Mark
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525268, 525321, 525189, 526901, 526943, C08F29708
Patent
active
057537739
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to multiphase block copolymers of propylene comprising -C.sub.10 1-alkenes, -C.sub.10 1-alkenes, 155.degree. C. and a stiffness (shear modulus G) conforming to the following condition (I): ##EQU2## where M.sub.a) denotes the amount of propylene polymer a) and M.sub.co denotes the amount of the multiphase block copolymer.
The invention further relates to the use of the multiphase block copolymers thus obtained for producing fibers, films/sheets and shaped articles, and also to the thus obtainable fibers, films/sheets and shaped articles comprising the multiphase block copolymers as essential component.
Because of their property profile, multiphase block copolymers are widely used, for example in motor vehicle construction, in the production of impact-modified consumer durables such as hard shell suitcases or plastic storage vessels, and also for producing office film/sheet.
DE-A-38 27 565 and DE-A-40 01 157 disclose copolymers based on propylene and ethylene which are produced using supported titanium catalysts. However, these copolymers have a wide molecular weight distribution which is undesirable for technical reasons. In addition, the copolymers disclosed by these laid-open applications no longer have fully satisfactory mechanical properties in particular when their melting points are distinctly reduced.
EP-A-433 990 describes a process for producing block copolymers of propylene wherein a metallocene catalyst was used for the polymerization, and the first stage of the two-stage process involves the production of a crystalline propylene polymer in liquid monomer. The block copolymers described therein have good low temperature impact toughness, in particular.
DE-A-41 30 429 discloses a process for producing multiphase block copolymers of propylene with the aid of metallocene catalyst systems that leads to block copolymers having satisfactory mechanical properties. For some sectors, however, the shape stability of the prior art copolymers of propylene is not always sufficiently high. This is in particular the case when such copolymers have a low melting point to facilitate their processing.
It is an object of the present invention to remedy the disadvantages described and to develop novel copolymers of propylene which shall possess, inter alia, a high shape stability combined with ease of processing.
We have found that this object is achieved by the above-defined multiphase block copolymers of propylene.
They comprise a polymer of propylene a) with from 0 to 5% by weight, in particular with from 0 to 3% by weight, of further C.sub.2 -C.sub.10 1-alkenes and a copolymer of propylene b) with from 5 to 98% by weight, in particular with from 10 to 96% by weight, of further C.sub.2 -C.sub.10 1-alkenes. In particularly preferred block copolymers of propylene, polymer a) is a propylene homopolymer and copolymer b) is a copolymer of propylene with from 15 to 95% by weight of further C.sub.2 -C.sub.10 1-alkenes. The term C.sub.2 -C.sub.10 1-alkenes is to be understood as meaning in particular C.sub.2 -C.sub.18 1-alkenes such as, for example, ethylene, 1-butene, 1-pentene, 1-hexene, 1-heptene or 1-octene and also mixtures of a plurality of these 1-alkenes. Preferred C.sub.2 -C.sub.1 1-alkenes are ethylene, 1-butene and mixtures thereof.
If desired, the block copolymers of the present invention may also comprise two or more mutually different copolymers of propylene b), in which case these copolymers may differ not only in respect of the level of copolymerized C.sub.2 -C.sub.10 1-alkene but also in respect of the nature of the copolymerized C.sub.2 -C.sub.10 1-alkene. Preference, however, is given to diphase block copolymers with one copolymer b).
The multiphase block copolymers of the present invention have a melt flow index of from 0.1 to 100 g/10 min, in particular of from 0.5 to 50 g/10 min, at 230.degree. C. under a weight of 2.16 kg. The melt flow index is that quantity of polymer in grams which the test apparatus standardized to DIN 53 735 extrudes within 10 minutes at a temperat
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Kersting Meinolf
Kerth Juergen
Langhauser Franz
Mueller Patrik
Schweier Guenther
BASF - Aktiengesellschaft
Nagumo Mark
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