Carbomer 940 gel liquified

omer

I made gel for methyl ester in 40% ethanol using carbomer 940, ph 7.2
After 1 month the gel turn liquid. 
No significant ph change observed. 
What could be the reson and solution. 
Buffer?

Also i tried to change the gelling agebt and used hpmc but i gives dryout layer. 

Any suggestions for the carbomer. 
And if i want to change the geeling agent, any suggestions 
Thanks

chemicalmatt

@omer are you referring to soy methyl esters? Depending on how much you used, and how much %water, that likely dissolved/disrupted the cross-links in the Carbopol. Try using Acrylates Copolymer or another acrylic copolymer compatible with ethanol and see what happens. 

omer

@chemicalmatt
I am referring to conventional methyl ester. 
I used cellulose ether based gelling agent but i give bad after application effect.
I don't have many gelling agents choices. 
So i am looking to solve the problem if possible. 
What i am thinking about is:
Use buffer ph 6_7(unfortunately carbomer 940 electrolytes senstive) 
Looking for suggestions 

Andraous

Try carbopol ultrez 21 @ 0.3%+0.1 AMP95 or TEA
AND YOU WILL BE SATISFIED 

omer

Thanks Androus, 
Will try as soon as get it

Benz3ne

omer said:

@chemicalmatt
I am referring to conventional methyl ester. 
I used cellulose ether based gelling agent but i give bad after application effect.
I don't have many gelling agents choices. 
So i am looking to solve the problem if possible. 
What i am thinking about is:
Use buffer ph 6_7(unfortunately carbomer 940 electrolytes senstive) 
Looking for suggestions 

Which conventional methyl ester? 
How are you neutralising the carbomer? It should be controllable to around pH 6-7 fairly easily with TEA at 40% ethanol.
I agree that it is electrolytes sensitive, which is not ideal, but it is manageable.