Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1998-01-20
2000-04-11
Short, Patricia A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525167, 525173, 525174, 525176, 525177, C08L 2304
Patent
active
060489375
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to thermoplastic molding materials containing, as essential components, melting point of less than or equal to 150.degree. C.
The present invention furthermore relates to processes for the preparation of these thermoplastic molding materials, their use for the production of fibers, films and moldings, and the fibers, films and moldings obtainable thereby and comprising the thermoplastic molding materials.
It is known that the processability of ethylene polymers can be improved by admixing small amounts of fluorine-containing polymers, such as polyvinylidene fluorides. However, the disadvantage here is that fluorine is contained in the end product and the fluorine elastomers are present as particles in the finished article and cause problems, for example during printing.
It is an object of the present invention to provide thermoplastic molding materials which are based on ethylene polymers, do not have the stated disadvantages and exhibit good processability and good surface properties.
We have found that this object is achieved by the thermoplastic molding materials defined at the outset.
We have also found processes for their preparation, their use for the production of fibers, films and moldings, and the fibers, films and moldings obtainable thereby.
The novel thermoplastic molding materials contain, as component A), from 95 to 99.99, preferably from 97 to 99.95, in particular from 99 to 99.9, % by weight of an ethylene polymer. This is understood as meaning homopolymers or copolymers of ethylene, preferably used comonomers being propylene, butenes, pentenes, including 4-methylpent-1-ene, and hexenes. However, higher alkenes, in particular alk-1-enes, such as oct-1-ene, may also be used as monomers for copolymers. Blends of different ethylene polymers may also be used. A part of the blends may also consist of polyolefins having polar comonomers and obtained by free radical polymerization.
There are virtually no restrictions with regard to the density of the ethylene polymers; it may vary within wide ranges, for example from 0.860 to 0.970 g/cm.sup.3. Particularly preferred ethylene polymers are those which have a very low density (ULDPE), which is generally from 0.880 to 0.910 g/cm.sup.3, those having a low density (LDPE), which is generally from 0.910 to 0.935 g/cm.sup.3, and those having a medium to relatively high density.
The molecular weight distribution (M.sub.w /M.sub.n) of the ethylene polymers used may also vary within wide ranges, for example from less than 2 to more than 30, an M.sub.w /M.sub.n of less than 16 being preferred.
The melt flow rates (MFR) of the ethylene polymers used may also vary within wide ranges, for example from less than 0.01 to 80 g/10 min (190/2.16).
Furthermore, there are virtually no restrictions with regard to the processes for the preparation of the ethylene polymers, preparation preferably being effected using Ziegler, Phillips or metallocene catalyst systems.
The novel thermoplastic molding materials contain, as component B), from 0.01 to 5, preferably from 0.05 to 3, in particular from 0.1 to 1, % by weight of a thermoplastic polyester having a maximum melting point of less than or equal to 150.degree. C.
Preferred components B) are polyesters which are obtainable by reacting a mixture containing, as essential components, containing, as essential components, ester-forming derivatives thereof, in particular di-C.sub.1 -C.sub.6 -alkyl esters, such as dimethyl, diethyl, dipropyl, dibutyl, dipentyl or dihexyl adipate, or a mixture thereof, preferably adipic acid or dimethyl adipate or a mixture thereof, acid or ester-forming derivatives thereof, in particular di-C.sub.1 -C.sub.6 -alkyl esters, such as dimethyl, diethyl, dipropyl, dibutyl, dipentyl or dihexyl terephthalate or a mixture thereof, preferably terephthalic acid or dimethyl terephthalate or a mixture thereof, having at least three, preferably from three to ten, in particular from three to six, groups capable of ester formation, preferably hydroxyl and/or carboxyl, compound of 2
REFERENCES:
patent: 3803259 (1974-04-01), Porchey
patent: 4328049 (1982-05-01), Richardson
patent: 4340528 (1982-07-01), Marsh
Kunststoff-Handbuch Bd 3/1, 1992, pp. 15-23.
Fortunato et al., Polymer, vol. 25, No. 18, pp. 4006-4010, 1994.
Bauer Peter
Faller Uwe
Seeliger Ursula
BASF - Aktiengesellschaft
Short Patricia A.
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