Alloys of cycloolefin polymers and polyaryl ether ketones

Details Alloys of cycloolefin polymers and polyaryl ether ketones Alloys of cycloolefin polymers and polyaryl ether ketones

1993-09-08

1994-12-27

Seidleck, James J.

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

Synthetic resins

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

526221, 526223, C08L 2318, C08L 2320, C08L 2324, C08L 6116

Patent

active

053767250

DESCRIPTION:

BRIEF SUMMARY
The synthesis and properties of cycloolefin polymers have been the subject of many publications recently. It is known that these olefins can be polymerized by means of various catalysts. Depending on the catalyst, the polymerization proceeds via ring opening (U.S. Pat. No. 3,577,072, U.S. Pat. No. 4,178,424) or by opening of the double bond (EP-A-156464, EP-A-283164, EP-A-291208, EP-A-291970, DE-A-3922546).
Cycloolefin homo- and copolymers are a class of polymer with an outstanding level of properties. They are distinguished, inter alia, by a high heat distortion point, stability to hydrolysis, a low absorption of water, resistance to weathering and transparency. Nevertheless, processability at high temperatures and high shearing forces is limited due to oxidative and thermal processes. Additives such as antioxidants and heat stabilizers are employed to extend the thermal processing range. High contents of additives can lead to a severely adverse impairment of the mechanical properties, such as the E modulus and yield stress, occurring. Additives can thus act as plasticizers, the shear modulus also being reduced over a wide temperature range.
To guarantee the processability of a polymer without occurrence of high shearing forces, the flow properties of the polymer can be improved by flow improvers, such as PE waxes. However, a severely adverse impairment of the abovementioned mechanical properties is also recorded here.
Polyaryl ether ketones are likewise well-known, which is demonstrated by the large number of publications on synthesis and properties: U.S. Pat. No. 3,953,400; U.S. Pat. No. 3,956,240; U.S. Pat. No. 4,247,682; U.S. Pat. No. 4,320,224; U.S. Pat. No. 4,339,568; Polymer 22 (1981), 1096-1103; Polymer 24 (1983), 953-958.
Polyaryl ether ketones are also a valuable class of polymer which is distinguished, inter alia, by a good impact strength and high heat resistance. Some polyaryl ether ketones are highly crystalline and exhibit melting temperatures far in excess of 300.degree. C., while others are amorphous. Amorphous and partly crystalline polyaryl ether ketones can be synthesized with various molecular weights by electrophilic aromatic substitution (U.S. Pat. No. 3,065,205; U.S. Pat. No. 3,956,240) or nucleophilic aromatic substitution (J. Polymer Sci., 1967, A-1, 5, 2415-2427; U.S. Pat. No. 4,107,837; U.S. Pat. No. 4,175,175, DE-B-1545106, CA-A-847963, DE-A-2803873).
Both classes of polymer are processed thermoplastically. Exposure to high temperatures over long periods of time leads to decomposition and oxidation products in cycloolefin polymers. Shorter intervals of exposure to heat, i.e. higher outputs by improving the flow properties, during extrusion or injection molding would therefore be of advantage. For some uses of polyaryl ether ketones, for example as matrix materials for composites, their mechanical properties, for example the E modulus or the shear modulus, continue to be in need of improvement. In this connection, the high absorption of water by amorphous polyaryl ether ketones is troublesome. It limits long-term use at a high humidity, since the dimensional stability is not guaranteed. A lower absorption of water would therefore be of advantage. It is now known that important properties of polymers, such as those mentioned above, can be modified by alloying polymers with other polymers. However, predicting the properties of an alloy from the properties of the individual components with certainty is to date still a long way off.
The object of the present invention is therefore to provide alloys of cycloolefin polymers and polyaryl ether ketones having increased flow properties and a further improvement in the mechanical properties.
The invention relates to polymer alloys comprising at least two components (A) and (B), wherein amounts of 99 to 1% by weight and the amounts of (A) and (B) relatively making up 100% by weight with respect to the total alloy.
Cycloolefin polymers (A) which are suitable for the alloys according to the invention contain structural units which are deriv

REFERENCES:
patent: 4720537 (1987-01-01), Brugel
patent: 4948856 (1990-08-01), Minchak et al.
patent: 5089562 (1992-02-01), van de Meer et al.

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