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Method of Measuring Amount of Crosslinker in Overcoat Bath

IP.com Disclosure Number: IPCOM000050271D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 13K

Publishing Venue

IBM

Related People

Alter, PC: AUTHOR [+2]

Abstract

Infrared quantitative analysis of the amount of crosslinker or hardening agent in a photoconductor overcoat bath is possible by the preparation steps of removing the bath solvent through evaporation and redissolving the solid residue into an infrared (IR) analysis compatible solvent. In the example discussed in detail below, the xylene solvent is incompatible with infrared spectroscopy in that it obscures the crosslinker IR band. The xylene solvent is removed by evaporation, and the solid residue is then dissolved in a chloroform solvent which is compatible with the IR spectroscopy procedure.

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Method of Measuring Amount of Crosslinker in Overcoat Bath

Infrared quantitative analysis of the amount of crosslinker or hardening agent in a photoconductor overcoat bath is possible by the preparation steps of removing the bath solvent through evaporation and redissolving the solid residue into an infrared (IR) analysis compatible solvent. In the example discussed in detail below, the xylene solvent is incompatible with infrared spectroscopy in that it obscures the crosslinker IR band. The xylene solvent is removed by evaporation, and the solid residue is then dissolved in a chloroform solvent which is compatible with the IR spectroscopy procedure.

An exemplary use of the method is for applying an infrared sprectroscopy procedure to determine the amount of melamine-formaldehyde crosslinker in uncrosslinked AT-50 polymer. The procedure is amenable to a quality assurance environment to control the amount of crosslinker and, consequently, the final degree of AT-50 cure. A precision of plus or minus 0.5 percent is obtainable.

Matched 0.2 mm CsBr liquid IR cells are calibrated to thickness [1]. A Perkin-Elmer 399B IR is used at the recommended settings for quantitative analysis [2], with the exceptions of a normal slit width and at a scan speed of 12 minutes. For this instrument and settings, 20 mg/ml AT-50 in CHC1(3) gives a full scale reading. Assuming 50 percent solids in AT-50 (determined experimentally and confirmed by Rohm and Haas), standards using AT-400 styrene/methyl methacryate copolymer and CYMEL 303* melamine- formaldehyde crosslinker are prepared. These standards are chosen because of availability and similarity...