Re: PVA for gum printing

Dear Katherine,

FWIW, maybe your friend can look for high or middle viscosity water soluble
PVA adhesives used in bookbinding / lamination / glueing packaging material
and experiment. These are quite soluble in "hot" water or acetone/water
mixture (best). After finding one that works well, he can get the necessary
information about that particular PVA directly from the manufacturer. While
I was researching PVA I had encountered this document:
http://www.sagebrushcountry.com/pdfs/adhesives.pdf maybe some key sentences
in the text will provide some help choosing the right PVA for the job.

Regards,
Loris.

----- Original Message -----
From: "Katharine Thayer" <kthayer@pacifier.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Thursday, June 17, 2004 1:19 PM
Subject: PVA for gum printing

> I've got a physical chemist interested in working out the chemistry of
> dichromated gum, but because gum is so complicated and variable and the
> structure isn't completely worked out, and the structure of PVA is
> simple, he wants to start with PVA and see if he can understand what
> happens there first, before considering gum.
>
> I told him that I had printed with gloy, which I believe to be mostly
> PVA, and it seemed to work very similarly to gum. But we need to use a
> pure PVA of course for these experiments, so I need to find a grade and
> molecular weight of PVA that would be similar to that used in gloy. I
> don't know where one would find that out about the PVA in gloy, can
> anyone give me a clue? Or suggest a grade and molecular weight that
> might be close?
>
> I googled "gloy" and found some places to buy gloy in UK, but not a
> manufacturer. But (gloy printers should appreciate this) I did find a
> composer who composed "Ode to Gloy" a parody of Beethoven's 9th, "in
> honor of the glue."
> Katharine
>
Received on Thu Jun 17 12:12:50 2004