Method for removing color from polymeric material

Details Method for removing color from polymeric material Method for removing color from polymeric material

2011-05-24

2011-05-24

Seidleck, James (Department: 1765)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Process of treating scrap or waste product containing solid...

C521S048500, C008S102000, C008S107000, C008S115510, C008S116100, C008S194000, C008S196000, C528S480000, C528S495000, C510S407000, C510S409000

Reexamination Certificate

active

07947750

ABSTRACT:
Color is removed from polymeric material by a method which comprises contacting a dyed or pigmented polymer composition with a non-aqueous extraction solvent comprising a nitrogen containing organic base, an ammonium salt and an alkanol. The present method is readily applied to a process for recycling colored polyamide substrates such as dyed nylon fiber.

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patent: 2006/0070188 (2006-04-01), Mauldin et al.
patent: 2007/0231283 (2007-10-01), Javet et al.

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