Kraton polymer range

Well-known materials are the Kraton polymer range, originally developed by Shell, and are produced in several types. The D series has an unsaturated rubber midblock - styrene/butadiene/styrene (SBS), and styrene/isoprene/styrene (SIS) - and the G series has a saturated midblock - styrene ethylene/butylene styrene (SEES) and styrene ethylene/propylene (SEP). The G series has increased resistance to oxidation and weathering, higher service temperature and better processing stability. 

KRATON polymers are high-performance elastomers used to improve the properties of a wide range of end products. KRATON G polymers are triblock copolymers, with a random ethylene/propylene copolymer forming the saturated midblock and styrene forming the two other blocks (styrene-ethylene/propylene-styrene, SEPS). 

General Description Kraton Polymers are a range of unhydrogenated styrenic block copolymers, compounds with an unsaturated rubber midblock (styrene-butadiene-styrene [SBS] and styrene-isoprene-styrene [SIS])J ° ]... 

The TPO part is power washed and the olefinic color coat is applied on the untreated, non-polar TPO surface. The ability of the Kraton Liquid Polymer to be formulated into a production color coat is a recent development and the adhesion mechanism is believed to be based on diffusion of very similar materials into each other with the aid of heat and solvents during the paint bake cycle. There may be other adhesion mechanisms occurring simultaneously. QC method TPO surface 1/visual, on-line identifies the color of the pigmented color coat ranging in thickness between 0.9-1.2 mils Painted part 1/ cross-hatch adhesion, 2/ other tests. 

Styrenic TPEs have strength properties equal to vulcanized rubber, but they do not require vulcanization. Properties are determined by polymer type and formulation. There is a wide latitude in compounding to meet a wide variety of application properties. According to application-driven formulations, Kratons are compounded with a hardness range from Shore A 28 to 95 (Shore A 95 is approximately equal to Shore D 40), sp gr from 0.90 to 1.18, tensile strengths from 150 to 5000 Ib/in (1.03 to 34.4 MPa), and flexibility down to 112°F (-80 C) (see Table 3.1).2... 

Two blends were reprocessed, namely PET/PP 1 with equal amounts of the two polymers and PET/PP 2 where the content of PET is two times that of PP. The concentration of Kraton ranged from 0 to 10%. 

The structural elucidation of multiphase polymers is a continuing problem as, at times, the few commonly used staining reagents are not satisfactory. Osmium tetroxide has the widest range of applicability, but there are polymers that cannot be differentiated by this stain. Mercuric trifluoroacetate has been described for the staining of several polymers [154] polystyrene, poly(2,6-dimethyl-l,4-phenylene oxide) and saturated styrene-butadiene-styrene block copolymers (Kraton G, trademark. Shell Oil Company). 

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