SU865130A3 - Thermoplastic mouldable composition - Google Patents

Abstract

Thermoplastic compositions moldable to articles of high impact strength are disclosed which comprise an intimate admixture of a polyphenylene ether resin, a styrene resin, and a radial teleblock copolymer comprising a vinyl aromatic compound, a saturated rubber, and a coupling agent. Also included within the scope of this invention are reinforced and flame-retardant compositions of said thermoplastic materials.

Description

one

This invention relates to polyether compositions, namely thermoplastic molding compositions based on polyphenylene ether resins, and can be used in the chemical industry.

Known thermoplastic molding composition based on a mixture of polyphenylene ether resins and various fillers, dyes G13

. The disadvantage of this composition is relatively low physical and mechanical properties, in particular, impact resistance.

Closest to the proposed invention in technical terms is a thermoplastic molding composition containing a poly (2, b-dimethyl-1, 4-phenylene) ether and a polystyrene resin selected from the group consisting of polystyrene and modified with butadiene rubber polystyrene C23.

The disadvantage of this composition is also relatively low impact resistance.

The purpose of the invention is to increase the impact strength of the composition.

The goal is achieved by the thermoplastic molding composition.

containing poly (2, b-dimethyl-1, 4-phenylene) ether and a polystyrene resin selected from the group consisting of polystyrene and polystyrene modified with butadiene rubber, further contains a hydrogenated radial teloblochny block copolymer of styrene and butadiene in the following ratio of components , weight:

10 Poly- (2, b-dimethyl-1,4phenylene) ether 5.0-55 Polystyrene resin 30-42 Hydrogenated radial teloblok block15 copolymer8-15 Preferred styrene resins are homopolystyrene and rubber-modified polystyrene resins with high impact strength, t . resins that are modified with natural or synthetic polymeric materials that conduct themselves as elastomers at room temperature (for example, 20-25 seconds),

25 in particular polystyrene resins containing polybutadiene or rubbery styrene-butadiene copolymers.

A suitable polystyrene with a high impact strength is 30

FG-834, manufactured by Fostergrant Co., which is a rubber-modified high impact polystyrene containing approximately 8% polybutadiene rubber. A preferred low molecular weight homopolystyrene is KPTL-5 product, which is commercially available from Arco Polymer, Inc., with an average molecular weight of approximately 40,000. Preferred homopolystyrene with a relatively high molecular weight is DYL-8G, The average MS medical weight is about iso 000, also produced by Arco.

Radial teleblock block copolymers are technically available products. They are obtained by copolymerization with styrene in the presence of an organometallic initiator, such as n-butylity, to produce copolymers that contain an active metallic atom, in particular lithium, at one end of each of the polymer chains. These polymers with metal atoms at the ends of the molecules are then used to react with a coupling reaction agent, the molecules of which contain at least three active sites that are suitable for reacting with the carbon-metal atom in the polymer chains and replacing the metal atoms of the chains. This leads to the formation of polymers that have relatively long branches, which come in the form of beams from the ring formed by the polyfunctional coupling agent.

Combination reaction agents for radial teleblock copolymers can be selected from the class of polyepoxides, polyisocyanates, polyimines, polyaldehydes, polyketones, polyesters polyanhydrides, polyhalides

etc.

The hydrogenation of radial teleblock block copolymers to produce hydrogenated radial teleblock block copolymers can be carried out by any known method.

The molecular weight of the hydrogenated radial teleblock block copolymer and the quantitative ratios between its comonomers can vary over a wide range. In preferred embodiments, the molecular weight of the hydrogenated radial teleblock copolymer is in the range of about 75,000 to 350,000, it contains 1 to 45 wt.% Of the vinyl aromatic units and 99 to 55 in. % saturated rubber in terms of the weight amount of the radial teleblock copolymer. The amount of coupling agent in the copolymer depends on the specific agent used and the amount of organometallic initiator. I usually use relatively small amounts of a combination agent, e.g. 0.1-1 wt. hours for every 100 weight.h. used resin.

The proposed compositions may include other components, in particular, flame retardants, fillers, substances to improve the technological properties of pigments, stabilizers and other agents added for the same purpose. It is possible to use reinforcing fillers in an amount sufficient to impart an improvement in the strength properties, in particular aluminum, iron, nickel, etc., as well as non-metallic reinforcing agents, in particular carbon fiber, silicates, in particular calcium needle silicate, asbestos, dioxide titanium, potassium titanate and titanate filamentous crystals, glass flakes, glass fibers, and the like.

Flame retardant compositions that contain flame retardant additives belonging to the class of halogenated organic compounds in mixture with antimony compounds, elemental phosphorus or phosphorus compounds, or compounds in molecules that have phosphorus-nitrogen bonds, are also proposed. or a mixture of two or more of the above components.

Claims (2)

1. Patent of Great Britain No. 930993, cl. 2 (5) R, pub. 1963. 2. US patent 3383435, cl. 260-874, published. 1968 (prototype). ;