Binary alloys based on polyether-amides and cycloolefin polymers

Details Binary alloys based on polyether-amides and cycloolefin polymers Binary alloys based on polyether-amides and cycloolefin polymers

1993-08-16

1995-06-06

Carrillo, Ana L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525184, C08L 6700, C08L 7712

Patent

active

054223970

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

Both amorphous and partially crystalline aromatic polyether-amides which can be processed as thermoplastics can be prepared in various molecular weights. These thermoplastic aromatic polyether-amides have been described in a German Patent Application (P 40 38 393) which has an earlier priority date, but was not published before the date of application of the present application; express reference is made to this patent application. These aromatic polyether-amides are a valuable class of polymers which has a high level of properties and is distinguished, inter alia, by good solvent resistance.
However, for some applications, for example as matrix materials for composites, it is desirable for these polyether-amides to have lower melt viscosities and lower water-absorption capacities.
It is known that technologically important properties of polymers, such as melt viscosity and water-absorption capacity, can be adjusted by alloying polymers with other polymers. However, reliable prediction of the properties of an alloy from the properties of the individual components is hitherto still distant. Alloying of polymers therefore remains substantially empirical.
DD-A-203 060 discloses alloys of norbornene-ethylene copolymers and polyamides. Polyamides which can be employed are, in particular, aliphatic polyamides, such as nylon 6 and nylon 6,6, and polyamides containing cycloaliphatic or aromatic chain members. The only example of a fully aromatic polyamide mentioned is poly-m-phenylene isophthalamide, but this cannot be processed by standard techniques for processing thermoplastics, such as extrusion or injection molding.
The object of the invention is therefore to provide alloys of thermoplastic aromatic polyether-amides with other polymers, which alloys have lower melt viscosities and lower water-absorption capacities than do the polyether-amides alone.
The invention relates to polymer alloys containing at least two components (a) and (b), wherein (a) is at least one thermoplastic aromatic polyether-amide of the formula (I) ##STR1## in which the symbols --Ar--, --Ar'--, --Ar.sub.1 --, --Ar.sub.2 --, --R--, --R'--, --Y--, x, y and z are as defined below: heteroaromatic radical or an --Ar*--Q--Ar*-- group, --bridge, and --Ar*-- is an aromatic radical, is a --C(CH.sub.3).sub.2 -- or --O--Ar*--O-- bridge, substituted or unsubstituted para- or meta-arylene radical, for example meta- or para-phenylene, --C(CF.sub.3).sub.2 -- bridge, it being possible for up to two different radicals Y to be bonded in the same polymer, equal to y, and x can adopt the value zero, --R and --R' which do not react further in the polymer, where --R and --R', independently of one another, are identical or different, and 40,000, and 99-50% by weight, and the proportion of (b) is 1-50% by weight, based on the sum of the proportions of (a) and (b). It is preferred to employ 1 or 2 components (a).
It is preferred for the proportion of component (a) to be 98-60% by weight, in particular 95-85% by weight, and that of component (b) to be 2-40% by weight, in particular 5-15% by weight, based on the sum of components (a) and (b).
In component (a), z is preferably greater than x. The molecular weight is adjusted during the preparation of a) by adding the monomer units in non-stoichiometric amounts. The polyether-amides (a) are prepared by polycondensation. When the polycondensation reaction is complete, the ends of the polymer chains are fully blocked by adding at least stoichiometric amounts of monofunctional reagents which react in the polymer to form groups R and R' which do not react further. The terminal groups R and R' are independent of one another and are identical or different, preferably identical. The terminal groups --R and --R' are preferably selected from the group comprising the radicals of the formulae II, III, IV and/or V ##STR2##
In the terminal groups IV and V, the terminal nitrogen in the formula I is in the form of an imide nitrogen (and not of NH); in the terminal groups II and III, the terminal nitrogen is in the for

REFERENCES:
patent: 5278214 (1994-01-01), Moriya et al.
Chemical Abstract 100 (1984), 140334v., "Thermoplastic Combinations".

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