Browse Prior Art Database

RECYCLING PROCESS FOR MIGRATION IMAGING MEMBERS

IP.com Disclosure Number: IPCOM000027036D
Original Publication Date: 1994-Dec-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 4 page(s) / 171K

Publishing Venue

Xerox Disclosure Journal

Abstract

Migration imaging members as disclosed in U.S. Patents 5,215,838 and 4,536,458 and comprising an aluminized polyester base sheet coated with a blend of a styrene-acrylate copolymer (such as Neocryl A-6221,- N,N'-diphenyl- N,N'-bis(3"-methylphenyl)-(l,l'-biphenyl)-4,4'-diamine, and selenium in a thickness of about 1.5 to 2 microns, and optionally further overcoated with a blend of metal free phthalocyanine and a styrene-acrylate resin (such as Neocryl A-622), can be recycled, enabling recovery of selenium, the styrene-acrylate resin, N,N'-diphenyl-N,N'-bis(3"-methylphenyl)-(l,l'-biphenyl)-4,4'- diamine charge transport material, and (if present), metal free phthalocyanine.

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

RECYCLING PROCESS FOR Proposed Classification MIGRATION IMAGING MEMBERS U.S. C1.430/041 Shadi L. Malhotra Int. C1. G03g 13/00

selenium +charge transport material HzPc + resin

(optional layer)

aluminium 60 % 40%

                                                 Distilled off at selenium +transport saturation compound 4f

t.i +resin

aluminium

POI

              Continuous toluene Extraction

i precipitatese i

I resin + charge I transport mat!. +

f solvent (acetone

I-,-,,,

1

I resin I I + solvent I I
I (acetone + 1 I methanol) I

1

polyester

r----- I

I precipitate i

I H~Pc 1

-----

-----A

_------

--------

Waste FI pl U

XEROX DISCLOSURE JOURNAL - Vol. 19, No. 6 NovembedDecember 1994 523

+methanol) I

I I - - - - - - - -

I I

polyester

_------

acetone 90% +

methanol 10%

resin

[This page contains 1 picture or other non-text object]

Page 2 of 4

RECYCLING PROCESS FOR MIGRATION IMAGING MEMBERS( Cont'd)

Migration imaging members as disclosed in U.S. Patents 5,215,838 and 4,536,458 and comprising an aluminized polyester base sheet coated with a blend of a styrene-acrylate copolymer (such as Neocryl A-6221,- N,N'-diphenyl- N,N'-bis(3"-methylphenyl)-(l,l'-biphenyl)-4,4'-diamine, and selenium in a thickness of about 1.5 to 2 microns, and optionally further overcoated with a blend of metal free phthalocyanine and a styrene-acrylate resin (such as Neocryl A-622), can be recycled, enabling recovery of selenium, the styrene- acrylate resin, N,N'-diphenyl-N,N'-bis(3"-methylphenyl)-(l,l'-biphenyl)-4,4'-
diamine charge transport material, and (if present), metal free phthalocyanine.

The phthalocyanine-containing coating, if present, is treated with a solventhonsolvent composition, such as a mixture of about 60 percent by weight acetone and about 40 percent by weight methanol. This treatment with a solventhonsolvent mixture removes the coating containing the phthalocyanine and the styrene-acrylate copolymer resin. Phthalocyanine is subsequently filtered out as a precipitate, leaving the styrene-acrylate copolymer in solution. If desired, the solventhonsolvent mixture can be used repeatedly to strip and extract phthalocyanine-containing layers from several successive migration imaging members. When the filtrate becomes saturated with the Copolymer, typically when it reaches a concentration of about 50 to about 60 percent by weight solids content, it is collected as a first filtrate (concentrate). The phthalocyanine precipitate can be washed with toluene to recover any copolymer resin which may still be associated with the phthalocyanine, thus yielding reasonably pure phthalocyanine as the precipitate and a second filtrate containing the copolymer resin.

The phthalocyanine-containing migration imaging member thus treated, or the original non-phalocyanine-containing migration imaging member, can be treated with a solventlnonsolvent composition, such as a mixture of about 60 percent by weig...