I always thought LPI ink is mixed Epoxy with Acrylic resin. Acrylic defines image ( free radical propagation unit by opening double bond) and Epoxy give hardness and all kind of resistance properties. I am truly not aware there are also all epoxy and all acrylic LPI  around. Could anyone give me some information about advantage and disadvantage among these different LPI inks? Also I am wondering what photo reaction could be in all epoxy system ? and if chemical resistance would be good enough for all acrylic system? Sorry for being ignorant and all input welcomed.

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From: 	[log in to unmask][SMTP:[log in to unmask]]
Sent: 	Monday, June 16, 1997 4:18 PM
To: 	[log in to unmask]
Subject: 	Re: Re[2]: LPISM Stripping

To clarify more, there is all epoxy LPISM, and there is also all acrylic
LPISM, and there also is mixed epoxy/acrylic LPISM, and virtually any coating
with SOME acrylic functionality can be stripped with strong alkali and
solvent.

Pure epoxy anything, whether it is photo-imagable, or simply thermal cure is
 more proof to stripping than butter coat, as butter coat contains bromine,
which makes in liable to attack, if only slightly.

Hope this clarifies somewhat.

Rudy Sedlak
RD Chemical Company

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