The influence of material combination and processing on the adhesion in overmolded parts made from hard thermoplastics and soft thermoplastic elastomers will be discussed.A method for testing the adhesion and examples for applications are presented.In contrast to standard SEBS products, adhesion modified THERMOLAST K thermoplastic elastomers (TPE's) provide excellent adhesion to a broad range of commodity and engineering grade thermoplastics.The overmolding adhesion is demonstrated, highlighting the strong influence of processing parameters on adhesion performance.For optimum results, high TPE melt temperature and injection speed are extremely important.For high-melting semi-crystalline thermoplastics, the insert molding process can be difficult.The effect of tool temperature and holding pressure on the adhesive force are comparatively less important, however it is proven that the holding pressure should be as low as possible for an optimized bond.Humidity has a strong neg. influence on the adhesion characteristics between TPEs and polar thermoplastics.The adhesive force can often depend on the hardness of the TPE.Injection molding machine processing parameters can greatly improve adhesion results.Guidelines for users are given.

Plastverarbeiter

TPE based on styrene block copolymers in the weathering test. Permanently stable

Author: Beitzel, Markus ; Berger, Gerhard

The TP 8 HPZ type from the thermoplastic elastomer series Thermolast K, based on styrene block copolymers, and 2 standard TPE-types, based on styrene-ethylene-butylene-styrene triblock copolymer (SEBS) and EPDM/polypropylene, were subjected to an artificial weathering test for 4000 h.Results on light fastness and tensile strength measurements demonstrate the superior durability of the new compound

HSBC based TPE for higher temperature resistance

Author: Beitzel, Markus

Working temperatures of TPEs can be enhanced, leading to a new type of crosslinked hydrogenated styrenic block copolymers (HSBC).Derivatives of styrene, which allow chem. crosslinkage of the endblocks, should lead to an increase of tensile properties of the polystyrene, PS, domains at higher temperaturesChem. crosslinked styrene based endblocks do not loose their strength above glass transition point of PS.The working temperature shifts considerably to higher temperature and is only limited by the onset m.p. of PP.The production of such novel, chem. crosslinked HSBC (HSBC-V) can be done by dynamic vulcanization of chem. modified styrene endblocks in a twin screw extruder.

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