NL8301055A - POLYCARBONATE THERMOPLASTIC POLYMER MIXTURE. - Google Patents

Description

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Short designation: Thermoplastic polymer mixture based on polycarbonate

Polycarbonate is a resin known to have special mechanical properties, especially in impact strength, but it has certain drawbacks that prevent its use in many high-consumption applications.

Among these drawbacks, the main ones are significant fragmentation at a thickness greater than a certain critical thickness, very low resistance to many organic solvents, and low impact temperature at low temperature.

These negative properties have significantly limited the use of polycarbonate in an area, namely the automotive industry, which, while constantly looking for new materials with better mechanical properties, should ensure that they have excellent resistance to those agents (gasoline , lubricants, cleaning agents, etc.) which, either usually or occasionally, may come into contact with the object while it is operating.

The literature describes examples of blends prepared by blending a polycarbonate with a polyester (Australian Patent 555998, U.S. Pat. Nos. 4,188,314 and 3,494,885), or by blending a polycarbonate with a polyolefin and a third such as an acrylic polymer (US Patent 4,245,058), a hydrogenated block copolymer (US Patent 4,122,131), or an epoxidisable polydiene (British Patent 1,149,695).

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The literature has also described a thermoplastic polymer blend (British Patent 1,007,724) containing at least 50% by weight of polycarbonate and no more than 50% of an olefin polymer which may be partially substituted by a polyester resin, so that the weight ratio of the olefin polymer is always greater than 1 relative to the polyester.

However, because of the significant plasticizing effect polyolefins have on polycarbonate, this blend has a rather low loading / deformation temperature, which is a limiting property for many applications, including the automotive industry.

Applicant has now unexpectedly found that it is possible to prepare materials with improved thermal properties by suitably blending bisphenol A polycarbonate with one or more thermoplastic polyesters prepared by condensing terephthalic acid with 8301055

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-2- 83.3029 4% t glycols of the general formula H0- (CH2) n -OH, where n is between 2 and 10 / IScene elastomers, in such amounts that the weight ratio of the olefin elastomer to the thermoplastic polyester is smaller is then or equal to 1.

Although the resulting materials have an impact strength very close to that of polycarbonate, they have excellent solvent resistance, low sensitivity to thickness, improved low temperature impact strength and easy molding conditions compared to the latter.

These polymer blends and the products obtained thereby therefore have physical, chemical and electrical properties which are generally better than that of polycarbonate when used as such or as blends as described in the above patents.

The present invention relates to a thermoplastic polymer blend and the materials obtained thereby, and comprises: a) bisphenol A polycarbonate; b) one or more polyolefin terephthalates in which the number of carbon atoms of the olefin group is between 2 and 10; C) a modifier which modifies the impact energy absorption mechanism and is selected from: I) a polyolefin having two or three carbon atoms; II) an olefin copolymer of two to three carbon atoms (of the EPR or EPDM type); III) a mixture of (I) with (II); IV) a mixture of (I) with a copolymer of polyethylene vinyl acetate (EVA); V) a mixture of (I), (II). and a copolymer of polyethylene vinyl acetate (EVA).

The amount of component A varies between 5 and 95 wt%, the amount of components b + c varies between 5 and 95 wt%, and the weight ratio of component £ to component b is less than or equal to 1 .

The polycarbonate used is preferably selected from those having an intrinsic viscosity in methylene chloride at 20 ° C between 0.46 and 1.2 dl / g.

The modifiers for the impact energy absorption mechanism used may be either simple polyethylenes or polypropylenes, or copolymers of two or more olefins such as EPC (ethylene-propylene) or EPDM (ethylene-propylene-diene) or mixture thereof with a copolymer of polyethylene vinyl acetate (EVA ') type.

Although not essential, best results are obtained by premixing 5 or more ingredients, then comminuting the resulting mixture into granules, and then shaping the mixture. The device used for mixing is not particularly important. Thus, screw extruders, twin screw extruders, Banbuymixers, and any devices commonly used in industrial practice are therefore suitable for this purpose.

The thermoplastic polymer blend of the present invention may be in various forms, such as powder, granules, spheres, slices, or other forms made, for example, by extrusion or by injection.

The mixture may contain various additives such as stabilizers, dyes, flame retardants, lubricants or fillers (fiberglass, carbon fiber, asbestos fiber, glass wool, etc.). All embodiments are apparent from the following examples, which serve only to illustrate the invention without limiting it in any way.

EXAMPLES "I TO LXXVII

The mixed ingredient granules are dried and mixed and extruded in a single screw extruder at a temperature of 275 ° C.

The polymer mixture thus obtained is then granulated and subjected to injection molding at temperatures between 260 and 280 ° C depending on the composition, the mold temperature being 60 ° C.

The following tests were carried out with the products obtained; 30 q) Izod notched impact test (ASTM D 256-61 method) b) Vicat softening point at 5 kg (ASTM D 1525-72 method) c) Modulus of elasticity during bending (ASTM D 790-70 method) d) Stress corrosion test:

Pressure is applied by the ASTM D 638 method to samples that have been subjected to 0.7% tensile deformation before and immersed for 2 hours in a 1: 1 (volume) mixture of toluene and isooctane to which 15% methyl alcohol is added. The retention percentage of the ultimate tensile strength of the non-immersed sample was then measured.

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The numbers obtained in Examples I to LXXVII are shown in Tables A to J.

abbreviations PC polycarbonate 5 PET polyethylene terephthalate EPR ethylene-propylene rubber EPDM ethylene-propylene-diene monomer terpolymer PBT polybutene terephthalate PP polypropylene 10 PE polyethylene EVA ethylene-vinyl acetate copolymer.

8301055

Claims (3)

A thermoplastic polymer blend consisting of at least one compound selected from the following groups: a) a bisphenol A polycarbonate; b) one or more polyolefin terphalates in which the number of carbon atoms of the olefin group is between 2 and 10; c) a modifier of the impact energy absorption mechanism selected from: I) one or C3 polyolefin; II) a C8 -C18 olefin copolymer; III) a mixture of (I) and (II); IV) a blend of (I) with a copolymer of a polyethylene vinyl acetate (EVA) type; V) a mixture of (I), (II) and a copolymer of the polyethylene vinyl acetate (EVA) type, such that the weight ratio of the component opzichte to component b kleiner is less than or equal to 1. Thermoplastic polymer mixture according to the preceding claim. characterized in that the amount of component a varies between 5 and 95 wt. %. Thermoplastic polymer mixture according to claim 1 or 2, characterized in that the amount of the components bb + varies between 5 and 95% by weight. i i --J 8301055