Alloys made from partly crystalline and amorphous poly (aryl eth

Details Alloys made from partly crystalline and amorphous poly (aryl eth Alloys made from partly crystalline and amorphous poly (aryl eth

1993-04-30

1994-08-30

Buttner, David

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

525471, C08L 7110

Patent

active

053426649

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

The invention relates to alloys of partly crystalline and amorphous poly(ether ketones) and to their use for the production of shaped articles or as a matrix material for composite materials.
In recent years, a large number of publications have appeared which describe the synthesis and properties of poly(aryl ethers). One of the earliest works is concerned with electrophilic substitution of aromatic dihalides using unsubstituted aromatic compounds, such as diphenyl ethers (U.S. Pat. No. 3,065,205). Johnson et al. (Journal of Polymer Science, A-1, 5, 1967, 2415-2427; U.S. Pat. Nos. 4,107,837 and 4,175,175) describe nucleophilic aromatic substitutions (condensations). This synthesis route has led to a novel class of poly(aryl ethers), the poly(aryl ether ketones).
The interest in poly(aryl ether ketones) has increased recently, as the appearance of a number of publications shows: U.S. Pat. Nos. 3,953,400; 3,956,240; 4,247,682; 4,320,224; 4,339,568; Polymer, 22 (1981), 1096-1103; Polymer 24 (1983), 953-958.
Some poly(aryl ether ketones) are highly crystalline and exhibit melting temperatures far in excess of 300.degree. C., while others are amorphous. Amorphous and partly crystalline poly(aryl ether ketones) can be synthesized with various molecular weights. Poly(aryl ether ketones) are a valuable class of polymers having a high level of properties. They are distinguished, inter alia, by a high thermal resistance and hydrolytic stability. Moreover, the partly crystalline poly(aryl ether ketones) have a good resistance to solvents.
Several partly crystalline poly(aryl ether ketones) are already commercially available, for example those having the following structure: ##STR1##
For some uses, for example as matrix materials for composites, the elongations at break and melt viscosities achieved to date for the partly crystalline poly(aryl ether ketones) are still in need of improvement.
It is now known that technologically important properties of polymers, such as those mentioned above, can be adjusted by alloying the polymers with other polymers. However, the ability to predict with certainty the properties of an alloy from the properties of the individual components is as yet a long way away. The alloying of polymers therefore remains largely empirical. The object of the present invention is therefore to provide alloys based on partly crystalline poly(aryl ether ketones) having an increased elongation at break and improved processibility in the melt, in particular for the preparation of composite materials.
It has now been found that alloys of partly crystalline poly(aryl ether ketones) and amorphous poly(aryl ether ketones) have both higher elongations at break and lower melt viscosities than the partly crystalline poly(aryl ether ketones) by themselves. Nevertheless, the alloys (in contrast to the amorphous poly(aryl ether ketones)) are resistant to solvents and have high moduli. The invention thus relates to polymer alloys comprising ether ketone) having a intrinsic viscosity of 0.2 to 5.0 dl/g ketone) having a intrinsic viscosity of 0.2 to 3.0 dl/g, the weights being based in each case on the total amount of components (a) plus (b) in the alloy.
The partly crystalline poly(aryl ether ketones) are preferably employed in amounts of 80 to 95 percent by weight, and in particular 90 to 95 percent by weight. The content of amorphous poly(aryl ether ketones) is preferably 20 to 5 percent by weight, in particular 10 to 5 percent by weight.
The alloys of the present invention comprise, as partly crystalline components, poly(aryl ether ketones) having one or more recurring units of the following formulae: ##STR2## in which Ar, independently of one another, is a divalent aromatic radical chosen from phenylene, biphenylene or naphthylene, X, independently of one another, is O, CO or a direct bond, n is an integer from zero to 3, b, c, d and e are zero or 1 and a is an integer from 1 to 4. Preferably, d is zero if b is 1. However, at least one of the recurring units contained in the component must have at l

REFERENCES:
patent: 4609714 (1986-09-01), Harris
patent: 4985293 (1991-01-01), Keep

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