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May 30, 2016

2 Min Read
Japanese supplier promotes novel modifiers for impact, tribological improvement

A range of novel graft copolymers from Japanese company NOF Corp. consisting of a polyolefin or polycarbonate as the main chain and a vinyl-based copolymer (i.e., one with a double bond) as the branch polymer imparts various properties to a variety of resins when used as modifiers in dosages of the order of 5-10%. The branch polymer may be styrenic, a methyl methacrylate, or an acrylonitrile-styrene entity, for example.

Additive confers scratch resistance (above) to polypropylene and TPO grades used in auto interiors. The photo below shows an unmodified compound.

One particular grade, Modiper A1100, when added in a 10% dosage to polybutylene terephthalate (PBT) resin, reduces abrasion loss in gears by half compared with grades employing a PTFE modifier. PBT is being increasingly applied in gears in the auto sector. Modiper series modifiers can also be used to modify polyacetal (POM), polyamide (PA) and polyphenylene sulfide (PPS) gears, bearings, door hinges, rails and other mechanical components according to NOF.

Another Modiper grade, AS100, can reduce the risk of squeaking from POM gears as well as reduce abrasion loss. It can also reduce such noise in sliding and moving parts such as interior mirror covers and arm rests molded from materials such as PC/ABS and ABS.

A further application of the Modiper A series is impact modification, examples of which include connectors and housings. “In the auto sector, wire harness connectors must exhibit good thermal impact properties over a temperature rang spanning -40°C through to 120°C,” says Yasuhiro Ohara, Manager, Fine Polymer Group at NOF. “A 5-10% loading of Modiper A4300 will ensure no cracking occurs as a result of thermal shock.”

Modiper also functions as a compatibilizing agent for alloys such as PC/PET, PC/PBT, PC/ABS, and PBT/ABS. Other functionalities it is known to deliver are paintability improvement, adhesion improvement. flowability improvement, weatherability improvement and as a dispersant for inorganic fillers, pigment, and additives.

NOF has also utilized its polymer grafting expertise to develop scratch resistance improvers such as Nofalloy KA832 for use in car exterior and interior trim components molded from polypropylene (PP) or TPO. The additive also improves the elongation and Izod impact properties of PP.

NOF offers technical service for Modiper and Nofalloy out of Shanghai (China), Frankfurt (Germany) and White Plains, NY.

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