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Styrene Block Copolymers as Impact Modifiers

Unpublished work at BASF has shown that using these S-EB-S block copolymers the highest notched impact strength is obtained with a high molecular weight product. Thus for the S-EB-S block copolymers of the Kraton [Pg.418]

Volume average Izod notched impact Modulus in SPS (wt%) Impact modifier particle size (pm) strength (kgcm/cm) tension (kg/cm2) [Pg.419]

The use of olefin rubbers [18] as good impact modifiers for sPS when used in conjunction with S-B or S-B-S block copolymers, which may be hydrogenated in the butadiene phase, has also been described. Instead of butadiene, isoprene can be used. Examples of the olefinic polymers are polyethylene, ethylene-propylene rubbers (EPR) and polypropylene-(ethylene propylene rubber) block copolymers. Here the styrene block copolymers presumably function as [Pg.421]

Similar blends and also blends containing additionally polyphenylene ether and glass fibres are described in EP 767 211 [19]. [Pg.423]

Instead of block copolymers, the use of pseudo-random linear copolymers of an aliphatic a-olefin and a vinyl aromatic monomer has been reported [20], where the styrene content of the polymer must be higher than 40 wt%. Preferred are styrene and ethylene copolymers. These blends may contain, amongst other things, an elastomeric olefinic impact modifier such as homopolymers and copolymers of a-olefins. Presumably the styrene-ethylene copolymer acts as a polymer emulsifier for the olefinic impact modifier. Using 5 wt% of an ethylene-styrene (30 70) copolymer and 20% of an ethylene-octene impact modifier in sPS, a tensile elongation (ASTM D638) of 25 % was obtained. [Pg.423]


Blends with styrene-butadiene-styrene block copolymers as impact-modified molding materials W. Germany 2,713,455 1977 General Electric... [Pg.578]


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A block

A block copolymers

A- styrene

Block styrenic

Copolymer modifiers

Impact copolymers

Impact modifiers styrenic copolymers

Impact modifies

Styrene block

Styrene block copolymers

Styrene-copolymers

Styrenic impact modifiers

Styrenics impact modifiers

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