Re: Adhesion

> Did you find the patent numbers you mentioned?

Not yet.

> Do you actually make silver gelatin emulsion, mix
> 3-aminopropyltriethoxysilane and coat glass with it? Do you see any
> adverse effect like increased fog (especially with gold
> sensitization)? If there's no increased fog, what kind of emulsion are
> you using?

Yes, I make a SH emulsion (ultra-fine grains of 10 - 30nm size) and I mix,
prior to coating, a small amount of 3-aminopropyltriethoxysilane. I don't
see any fogging. I did not yet carry out any gold sensitization but plan to
do that in the next weeks.
I did quite some plates, using simple bathing methods, forming the silver
halide grains in situ in an already coated gelatin layer. I assume that
method may be applied to emulsions on other substrates too...

> Fuji even sells their stylene butadiene
> latex copolymer in a bottle.

Sounds interesting. I wonder if that stuff adheres also on polycarbonate.
With respect to optical performance, PC looks superior to PET since it's
inherently a non-birefringent material.

Martin

----- Original Message -----
From: "Ryuji Suzuki" <rs@silvergrain.org>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Sunday, February 13, 2005 8:36 PM
Subject: Re: Adhesion

> From: MARTINM <martinm@SoftHome.net>
> Subject: Re: Adhesion
> Date: Sun, 13 Feb 2005 12:25:32 +0100
>
> > I am not sure whether the 3-aminopropyltriethoxysilane is the best
> > silane to use when dealing with gum arabic
> > solutions. 3-aminopropyltriethoxysilane used to be the standard
> > agent to promote gelatin (silver-halide emulsions) adhesion on
> > glass.
>
> Did you find the patent numbers you mentioned? I've never seen a
> silane agent used for improved adhesion in the photosensitive layer.
> Silane compounds are often used as a reduction sensitizing agent
> and/or a crosslinking agent in silver gelatin patents.
>
> Do you actually make silver gelatin emulsion, mix
> 3-aminopropyltriethoxysilane and coat glass with it? Do you see any
> adverse effect like increased fog (especially with gold
> sensitization)? If there's no increased fog, what kind of emulsion are
> you using?
>
> Cases I've seen of using 3-aminopropyltriethoxysilane and other amino-
> epoxy- and other silane compounds as an agent to improve adhesion use
> a separate subbing layer of material more hydrophillic than the base
> substrate but less hyrdophilic than gelatin, such as butadiene
> copolymers, methacrylate copolymers, vinylidene chlorides,
> polyurethane, etc. These are described in US Patent numbers 6,300,048
> and 6,348,305, and references therein.
>
> These polymers, butadiene and vinylidene chloride in particular, are
> used as a subbing material on corona discharge treated polyester film
> bases to improve adhesion. Fuji even sells their stylene butadiene
> latex copolymer in a bottle.
>
> --
> Ryuji Suzuki
> "Well, believing is all right, just don't let the wrong people know
> what it's all about." (Bob Dylan, Need a Woman, 1982)
Received on Mon Feb 14 05:44:43 2005