KPR developer is listed here as a mixture of xylenes, ethylbenzene, and 2-methoxyethylacetate (cas110-49-6). Another name for the latter is ethanol, 2-methoxy, 1-acetate. In other words, it is ethyl acetate with a methoxy attached to the end of the ethyl group.
http://www.mgchemicals.com/msds/english/718.pdfShelf life is probably quite good. The 2-methoxyethylacetate might hydrolyze a little, if any water is present. As for making it, one might be able to omit the ethylbenzene entirely from a workable substititute, or substitute toluene for it. If you eliminate the ethylbenzene, increase the amount of xylenes to compensate. If you use toluene, I would consider reducing its concentration to about half of the ethylbenzene concentration and making up the difference with xylenes.
I suspect the methoxyethylacetate or something similar is essential. Diglyme might work. You won't be able to find either at a consumer store. Since you will end up ordering something, it might as well be the original methoxyethylacetate.
John
----- Original Message -----
From: lemar
To: Homebrew_PCBs@yahoogroups.com
Sent: Thursday, March 08, 2012 7:13 PM
Subject: [Homebrew_PCBs] Re: KPR developer
Thanks, I'll give that a try. Any idea what the shelf life is for KPR?
--- In Homebrew_PCBs@yahoogroups.com, "bebx2000" <bebx2000@...> wrote:
>
>
>
> I think the Datak negative spray-on photoresist is the same as the old KPR. The resist and developer are listed at the bottom of this page,
>
> http://shop.vetcosurplus.com/catalog/default.php?cPath=94_153
>
> Baxter
>
> --- In Homebrew_PCBs@yahoogroups.com, "lemar" <doyle51241@> wrote:
> >
> > i have some Kodak KPR photoresist left over from experimenting several years ago but I have not more developer. Any ideas for a substitute for the original? Something simple?
> > Thanks,
> >
> > LeMar
> >
>
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