gel stiffness - Chemists Corner

Formulating

gel stiffness

Posted by ssdc on December 15, 2014 at 8:46 pm

I would like to know if glyceryl oleate alone can affect the gel stiffness of a shaving gel. If it can what properties of the glyceryl oleate which contribute to this effect? Is it due to the heavy metal content?

Below is the list of ingredients of a shaving gel I got from internet.

Water, Palmitic Acid, Triethanolamine, Stearic Acid, Isopentane, Glyceryl Oleate, Glycerin,

Isobutene, Sorbitol, Hydroxyethylcellulose, PTFE, Menthol, PEG-90M, Tocopheryl

Acetate, PEG-23M, Propylene Glycol, Glyceryl Acrylate/Acrylic Acid Copolymer, PVM/MA

Copolymer,

Thank you for your input

ssdc replied 9 years, 8 months ago 3 Members · 9 Replies
9 Replies

David

Member
December 16, 2014 at 5:42 am

Glyceryl oleate is an emulsifier, and as with all emulsifiers it has an effect on emulsion stability and viscosity. Note that this is a special formulation containing gas though. “Post”-foaming gel.
Bobzchemist

Member
December 16, 2014 at 3:23 pm

Glyceryl Oleate has no heavy metal content. Neither do any other cosmetic ingredients. Where are you getting your information?
ssdc

Member
December 17, 2014 at 5:56 am

@bobzchemist I am just guessing. Sometimes the the heavy metal comes from the reactor tank

I have customer complaining that my glyceryl oleate is not giving the same gel stiffness as the previous supplier.

I was just wondering what is the chemistry behind this
Bobzchemist

Member
December 17, 2014 at 9:22 am

“Heavy metal” has a very specific meaning jn chemistry: http://en.wikipedia.org/wiki/Heavy_metal_%28chemistry%29

It is possible to get tiny amounts of metallic oxides in a raw material as contaminants from the reactor/manufacture/storage, but it’s very unlikely, and it would be even more unlikely for those contaminants to affect performance.
ssdc

Member
December 17, 2014 at 7:13 pm

ok thanks.

can anyone tell me other possibilities of bad performance?
ssdc

Member
January 12, 2015 at 2:06 am

can somebody tell me how is gel stiffness measurement is made?

through rheometer or penetrometer?

and how does the C value quantify the gel stiffness?

Thank you so much for your input
Bobzchemist

Member
January 12, 2015 at 8:41 am

Ideally, a Brookfield viscometer with a helipath stand and t-bar spindles is used. I’ve never worked with anything called a C value - do you mean Cps?

Just fyi, a rheometer is a much more precise instrument than a viscometer, and costs between 10x - 100x more. That level of precision is not typically needed for cosmetics.
ssdc

Member
January 12, 2015 at 8:58 pm

@Bobzchemist Thank you for your input

The below article stated that they measure the gel stiffness in C value penetration

Please have a look

http://www.google.co.ao/patents/US3775448
ssdc

Member
January 12, 2015 at 9:02 pm

Refering to the ingredients above, in your opinion which holds the more responsible in forming a gel?

The copolymer or the glyceryl oleate?