Bayblend

Blends of ABS with polycarbonates have been available for several years (e.g. Bayblend by Bayer and Cycoloy by Borg-Wamer). In many respects these polymers have properties intermediate to the parent plastics materials with heat distortion temperatures up to 130°C. They also show good impact strength, particularly at low temperatures. Self-extinguishing and flame retarding grades have been made available. The materials thus provide possible alternatives to modified poly(phenylene oxides) of the Noryl type described in Chapter 21. (See also sections 16.16 and 20.8.)... 

Trade name examples Bayblend, Multilon, Pulse, Strapon. 

A prototype heating and ventilation control panel produced by Bayer and Lumitec using a luminescent plastic film system incorporating a special electroluminescent electrode system. The panel can be produced in a single process step using Bayfol films and a PC/ABS blend (Bayblend ). 

The most important commercial blends of BPA-PC are poly(acrylonitrile-butadiene-styrene) (PC/ABS) and polybutylene terephthalate (PC/PBT) or polyethylene terephthalate (PET). Commercial grades of PC/ABS include CYCOLOY (GE), Bayblend (Bayer), and PULSE (Dow). PC/ABS blends exhibit improved flow and processability and enhanced low-temperature impact strength in comparison to PC (Fig. 3). These blends are widely used in applications requiring enhanced impact resistance, such as interior automotive parts and computer and electronics applications such as computer housings and cell phones. Non-halogenated flame-retardant PC/ABS blends are widely available. Poly(acrylic-styrene-acrylonitrile) (PC/ ASA) blends (GELOY , GE Luran , BASF) provide improved weatherability for outdoor applications such as exterior automotive parts, but exhibit reduced impact performance at low temperatures in comparison to PC/ABS. PC/PBT or PET blends (XENOY , GE Makroblend , Bayer) provide enhanced chemical resistance and weatherability for applications such as lawn and garden equipment and automotive bumpers and fasdas. 

Bayblend . [Bayer Miles Albis UK Ltd.] PC/ABS blends, some glass reinforced thermoplastic resins for business machine and automotive markets. 

BB. [G>mpounding Tech.) Glass-reinforced Bayblend resin. 

In 1983, Monsanto developed blends with co-continuous morphology, Triax 2000. These alloys comprised PC, ABS, and styrene-methylmethac-rylate-maleic anhydride (SMMA-MA) [Jones and Mendelson, 1985]. One year later, PC was reactively blended with either ABS, SAN-GMA, and NBR, or with graft copolymers of acrylonitrile-butadiene-a-methyl styrene-methyl-methacrylate (MeABS) and acryloiutrile-a-methyl styrene-methyl methacrylate copolymer (MeSAN) [Kress et al., 1986]. The blends were commercialized by Bayer as Bayblend . 

PC/ABS (Alphaloy . Bayblend Z Cvco/ov . Denka HS. Dialoy C. Excelov . lupilon . Lvnex B, Malecca P, MB2200. Multilon . Novaloy S. Proloy /Lexan . Pulse . PX. Ryulex , SC 250, Techniace TC, Toplex . Triax 2000. ABS/PC 7901)... 

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... 

Bayblend T, Triax 2000) PC/ABS blends require more heat to form than ABS. This can be accomplished by means of longer cycles and/or increased stock temperamre - the normal forming temperarnre for the blend is 205-230°C, i.e., 10°C higher than that for ABS. Stored sheets need to be dried at 82-93°C for up to 8 hours. 

Bayblend ) PC/ABS/SAN blends are thermoformed using standard methods at sheet tempera-... 

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