water soluble elastomer?

[TJM]

Can anyone suggest a water-soluble elastomer, or a water-soluble plastic
with Tg>room temperature. I need a (hydrophobic) elastomeric coating for a
hydrophilic substrate. I've found a few polyurethanes but little else,
although I'm sure I'm missing something. Suggestions?

Thanks in advance,
Thomas
es...@mesh.net

[Mark Thorson]

TJM wrote:

> Can anyone suggest a water-soluble elastomer, or a water-soluble plastic
> with Tg>room temperature. I need a (hydrophobic) elastomeric coating for a
> hydrophilic substrate. I've found a few polyurethanes but little else,
> although I'm sure I'm missing something. Suggestions?

Latex can form an emulsion in water. Charged latex micelles
can be electrodeposited. Maybe you should look at the
polymer emulsions used for electrocoating/electropainting.
They are used to coat auto bodies with primer layer, and
for certain photoresist chemistries used on printed circuit
boards.

[Dale A Trynor]

TJM wrote:

This is probably useless and you must already know about it, but what about
vinyl alcohol. I used it as a mold release for fiberglass resins and it is a
water soluble plastic. I have pealed if off of various materials just as if it
were plastic film after it dried. You can recycle it too.

I could very easily be wrong, but seam to remember gloves made of it being
sold due to certain advantages in handling some types of hydrocarbons and or
etc. Anyone know about this or is it just another common error in my memory.
Sometimes its been years sense I read about a lot of this.

www.alternatescience.com

[Frank Logullo]

you need to be more specific.
Frank

[Charles B. Schroebel]

Polyvinyl alcohol, while not hydrophobic, would be a good bet.
Especially 100%.

Saponafication of polyvinylacetate to pvoh is available in a number
of grades. Monsanto, Air Products used to be big manufacturers of
it. Japanese make a lot of it. if i remember right, the usual
polymerization numbers are 50,000-300,000. that was a long time
ago and maybe the numbers have changed, but maybe not as applications
in paint (PVA) and release moldings (PVOH) showed no improvements
with #'s >300,000.

guess dupont still markets it

try: www.chemexpo.com/news/PROFILE980112.cfm

(google, 10K hits)

Charles B. Schroebel
Box 1205
Baltimore, MD 21203-1205
voice: (410) 396-3859
Fax: (410) 396-1523
Email: csch...@umaryland.edu
geht noch ein?
noch ein geht immer noch 'rein

[Frank Logullo]

"Charles B. Schroebel" <csc...@gl.umbc.edu> wrote in message
news:Pine.LNX.4.31L.02.0203...@linux1.gl.umbc.edu...

> Polyvinyl alcohol, while not hydrophobic, would be a good bet.
> Especially 100%.
>
> Saponafication of polyvinylacetate to pvoh is available in a number
> of grades. Monsanto, Air Products used to be big manufacturers of
> it. Japanese make a lot of it. if i remember right, the usual
> polymerization numbers are 50,000-300,000. that was a long time
> ago and maybe the numbers have changed, but maybe not as applications
> in paint (PVA) and release moldings (PVOH) showed no improvements
> with #'s >300,000.
>
> guess dupont still markets it
>

DuPont still makes Elvanol:
http://www.dupont.com/industrial-polymers/elvanol/
Better buy some before Chad sells the business.
My first thought on this thread was Neoprene latex (used to coat, make
gloves, etc.) since elastomers are crosslinked; but, I still say poster must
be more specific.
Frank

[Uncle Al]

Truly, what does he want in the way of coating properties and delivery
system? Water elastomer emulsions are common, water solutions are
not. Plasti-Dip comes in a dispersed aqueous version. It is the
stuff on tool handles - great cushion, but tough/leathery not
tough/bouncy.

--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
"Quis custodiet ipsos custodes?" The Net!

[a-s]

I've done something of the sort with alkali soluble acrylics. Make an
ammonia solution to deposit the coating, ammonia evaporates and coating
becomes hydrophobic. The actual materials I used are no longer available,
but Ciba and others may have something similar.

alan

"TJM" <es...@mesh.net> wrote in message
news:CwBf8.61980$GK7.79...@newssvr30.news.prodigy.com...

[The Mekon]

"Frank Logullo" <frank....@dol.net> wrote in message
news:IDPf8.6$rc....@monger.newsread.com...

There is also a company called environmental polymers:
http://www.epgplc.com/company.html

[TJM]

Sorry for the vagueness, but of course the request has a commercial
application.

I need an elastomer (or low Tg thermoplastic) that is molecularly soluble in
water, not dispersed or a latex, and is obviously not crosslinked. The pH is
not critical. The substrate is a hydrophilic metal oxide, which I need to be
hydrophobic after the polymer solution has been dried. The elastomer should
adhere strongly to the substrate after drying. Preferably, the solubilizing
groups (sulfonate, carboxylate or whatever) of the otherwise hydrophobic
polymer chain will interact with the oxide surface, leaving the hydrophobic
chain segments to extend from the surface, much the same way a low molecular
weight surfactant would behave (e.g., SDS).

I searched for "sulfonated SBR" and "water-soluble elastomer" with no luck.
I have gotten suggestions for gelatin, Surlyn, and various acrylates, in
addition to the ones in this thread, which are appreciated. I'm just curious
to know if I'm overlooking something obvious, or if there really are so few
such polymers.

Thomas

"Frank Logullo" <frank....@dol.net> wrote in message
news:IDPf8.6$rc....@monger.newsread.com...
>

[Mingxin Qiu]

Hi Thomas,
pls try to use the material of sodium polyacrylayes (light crosslinked)

Tom