Stapron

Stapron. [DSM DSM UK] SQnendma-teic anhydride copolymer, rubber-modified, some glass reinfoiced amorphous enginening plastic. 

Molten polyesters show low viscosity and small extmdate swell. For these reasons, they have been blended with amorphous polymers to improve the latter s processability and chemical resistance. Elastomers have also been added to polyesters to improve impact resistance. Blends of polyester (either PET or PBT) with polycarbonate, PC, are the most popular (viz., Bay/oF, BCT4201, Calibre , Dialoy P, Ektar MB (with PCTG), Idemitsu SC, MakroblencT, MB4300, NovadoF, Pocan , R2-9000, Sabre , SC 600, Stapron E, Ultra-blencF KR, Valox , Xenoy 1000, etc.). Presence of PC in PET/PC increases crystallization rate of PET, which translates into faster injection molding cycle and lower part distortion upon demolding than those observed for neat PET. 

The ester linkage is particularly susceptible to hydrolysis. Thus blends containing PEST must be dried to prevent splaying PC/PB/PET or PBT blends Stapron ), PCTG with PC or SMA Ektar MB), PBT/ABS Novalloy -B or Cev-ian), PC/PET or PBT/PB Stapron E), PC/ABS/ SAN Bayblend ) and PC/ABS BayblencT T). In PET/elastomer systems Rynite ), if moismre exceeds 0.2 wt% the processability and final... 

Eor PA/ABS blends, e.g., Alphaloy MPA, Elemid , Diaaloy N, Kane ace MUH, Malecca S, Maxloy A, Monkalloy N, N5, Novaloy -A, Stapron N, SX, Techniace TA, Toyolac Adloy, Triax 1000, Ultramid ), single or twin screw extruders are suitable. However, the latter are preferred. Typical ABS extrusion procedure should be followed. Eor two-stage screws, a first stage compression ratio of 25-2.1 and pump ratio 1.5-2 are recommended. 

For impact-modified blends (Xenoy 1200 and 5720, Stapron E), screw speed should be set at minimum, as low as possible (less than 50 rpm), just sufficient to assure a reasonable cycle time. Melt temperature should be kept as low as possible, without binding the screw. When temperature control is critical, as is the case here, the acmal melt temperature should be checked with a pyrometer or digital thermometer, rather than relying on barrel set points. The material runs best in thick parts with oversized gates. Injection speed of 25 mm/sec is suggested. When running a large shot (>70% of machine capacity), a flat or reverse barrel heat profile may help to convey the melt. 

Stapron N (DSM Polymers Inti., Netherlands) ADS/PA-6 Resistant to acid, alkah, alcohol and oil poor resistance in gasoline... 

Stapron S SM300 it[DSM Engineering Plastics http //www.dsmep.com]-, Stapron S SM400 t[DSM Engineering Plastics http //www.dsmep.com]-, Surfynol CT-151 [Air Prods./Perf. Chems. http //WWW. airproducts. com]... 

Dylark 132 Dylark 232 Dylark 238 Dylark 240 Dylark 250 Dylark 332 Dylark 350 Dylark 378 Dylark 480 Dylark 700 Intacol S-22 Intacol S-24 Intacol S-26 Intacol S-28 Intacol S-2240 Intacol S-2252 Intacol S-2425 NovaCote 1936 NovaCote 2000 Scripset 520 Scripset 540 Scripset 542 Scripset 550 Scripset 640 Scripset 700 Scripset 720 Scripset 740 Scripset 742 Scripset 745 Scripset 746 Scripset 747 Scripset 810 SMA 1000 SMA 1440 SMA 2000 SMA 2625 SMA 3000 SMA 3840 SMA 17352 SMA EF-30 Flake SMA EF-40 Flake Stapron S SM200 Stapron S SM300 Stapron S SM400 Styrene/MA copolymer Surfynol CT-151 9011-14-7 Altuglas BPA-500 Delag I as -A Delaprism ... 

Stapron C Polycarbonate/acrylonitrile-butadiene-styrene DSM Polymer Int. 

Stapron E Polycarbonate/PET or PBT with PB as impact-modifier for interior automobile door panels DSM Polymer Int. 

Stapron N Polyamide-6, PA-6, alloys with ABS with impact-modified PA-phase DSM Polymer Int. 

Stapron S Rubber modified amorphous SMA with glass fiber reinforcements or not DSM Polymer Int. 

Stapron S rubber modified (Dutch State Mines)... 

Stanyl, Nylon 4/6, DSM Engineering Plastics Stapron C, ABS/PC blends, DSM Engineering Plastics... 

Stapron E DSM PBT PIB addition of PIB lowers UV stability because of presence of double bonds... 

The use of homopolymers is frequently limited by a weaker property. For example, polycarbonate exhibits environmental stress-cradring, polyamide shrinkage, polyphenylene ether is difEcult to process, and ABS has low heat of distortion. Blending may diminish weak points and improve strong points. Stapron was developed with this principle in mind. PRODUCER... 

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