no1 - 7-8-2007 at 19:19
Hi everybody
i just wanna ask you about the preparation of the polymer attached
known that this polymer is prepared from ethylene oxide and ethylene glycol
i tried finding the procedure for this polymer and i found these sites
http://www.polymersource.com/shoppingCart/product.asp?ID=659
http://www.freepatentsonline.com/7009033.html
the second one contain the procedure for polymers similar to the one i want but not the same
as i think we can do polymerization for the ethylene glycol
by ring opening and then addition of carboxyl group
the catalyst used in this process may be NaNH2 and using aquous alkali to control th epolymerization process 
but the rest of the steps are still unknown to me '
anybody help
thnx
not_important - 7-8-2007 at 20:19
The patent reference dos describe how to do it.
You will need to start with the hydroxy-butyric acid, treat if base so that the salt is formed and there is enough excess base to serve as a catalyst
to cause ethylene oxide to react with the hydroxy group. There's goig to have to be several purification steps to remove by-products.
no1 - 8-8-2007 at 05:31
Excuse me in my question
where can i find the patent reference ?
not_important - 8-8-2007 at 06:13
The very patent you gave in your first posting.
I suspect that a little searching of the patent literature on modified PEOs and and ethylene oxide will turn up a number related processes, for what
the sometimes sketchy descriptions are worth.
chemrox - 18-8-2007 at 23:06
Excuse me but what's going on here? You posted the patent procedure and then asked how to make it??? You don't like the patent method? You don't
want to buy the hydroxy butyric acid? You bought a bunch of stuff from Fluka and didn't pay your bill? What?