chemicalmatt
Forum Replies Created
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Well, if that is the case, there is a Midwest SCC meeting tonight, 14-NOV-17, so I may well see these folks there.
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I didn’t know that Universal Beauty Products even had a VT color cosmetics operation, Bob. Are we talking about the same parent company based here in Chicago’s suburbs?
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I like the glyphosphate analogy there, DAS. I just read in C&EN today about limiting DINP (diisononyl phthalate, one of the best plasticizers for PVC, HDPE resins) to 0.10% total, an ineffective level for its purpose. This is one of the most thoroughly studied compounds on planet earth, and has yet to be found substantially harmful at even the most unrealistic exposure levels possible. Perhaps the DINP suppliers should just start calling their product “vegan” like the HBA marketers in the U.S. so bogusly do. Might help their cause.
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Federal - see the monograph.
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ryanou, this is simpler than you may suppose. You only need to add a hydrotrope as co-surfactant here, as nonoxynol-9 is a not exactly hydrophyllic, despite any HLB value attached. I suggest disodium cocoamphodiproprionate, a useful amphoteric hydrotrope (Solvay, Ele’ for sources). A little dab will do ‘ya. Also, CMC doesn’t have any yield value to suspend whatever is to be suspended. I’d drop it.
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Try adding the albumin below 35C. I’ve found when I add serum albumin at too high a temp I get “scrambled eggs” - quite literally!
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I’ve found USP or FG to have a lower cloud point than other grades. Also, try a little butylene glycol to help clarify. Helps “detackify” your formula also.
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Nice little synapsis, David08848, regarding shaving soaps. I’ll add that the order of addition of the alkali has much to do with the outcome as well. Being a soap guy, you know that already. I’ll also add that if the formulator can get past the idea of “soap” and use a “gel” for shaving, the attributes get more diverse and the ingredients and outcome more interesting. I’ll say no more except to hint that luukheum may be onto something with his/her(?) CETAC idea.
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You are in North America I presume? I may be able to help. Most folks do not like to handle methyl methacrylate, etc., etc. Needs certain process controls.
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All that rhelogical mess…just to place a tiny bit of shea butter into your formula. DEL and just add 0.01% shea butter extract, likely miscible in glycerin & PG . Also, I can’t fathom how such a wee level of Zn Sulfate is contributing to “sebum control.” Can you?
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Use C12-15 alkyl benzoate to solubilize the fragrance oil first (assuming it is miscible; most are) then disperse this into cyclomethicone, then slowly add the dimethcones and higher MW silicone derivatives. If it clouds, you may need to increase your cyclomethicone level at the expense of the others - or reduce the fragrance level. What CAN’T Finsolv TN do, I ask you?
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…what Bill Toge said, and I always admire how Bill is always so politely glib about these things (even when stating the obvious, eh, Bill?) That said - and it IS obvious - we need to answer Avirock’s original question here: there is no realistic substitute for SDA in it’s role in personal care formulation as a solvent, or as a safe-to-use bacteriostat. I mean, you can apply phenol if you want to, but that will get you into trouble. Reminds me of when the U.S. reduced SDA usage in products to 55%, and hair spritz customers would ask “Can you make it so it still dries just as fast?” Me: “Uhhhh…..no.”
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Cool move, Belassi. They say “necessity is the mother of invention.” Maybe throw some BIT (aka Kathon) in there next time and make it “mold-resistant” concrete crack filler? I smell a patent here for you.
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Virtually all of the colours you folks mention are not stable at certain pH levels. This could be the cause of your problem, not UV light.(Cibafast works quite well in normal conditions.) Also, if you have alkyl quats or alkyl amines present in your formula - watch out.
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Two things here, friends: definitely apply the lactate buffer to his at pH 5.0 - plus, and add a lot of propylene glycol, not only to solvate SalAcid but to lower the water activity stabilizing urea even more. Also: urea at 5.0% or more softens keratin (that would be skin, right?) remarkably well. That is why it has been used in skin-softening creams for over 80 years. Urea is one the oldest known skin-care treatments in our industry.
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The presence of urea in solution will greatly increase the solubility of allantoin. You will just have to deal with urea in your formula then, not the worst thing for a skin-care product, eh?
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Natasha, try acrylamide copolymers for this effect. In English the word to describe is “pituity”. (Most English speakers don’t know this too.) Liquid stretching between hands like spider web.
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Use oxalic acid it at 5.0 - 7.0% for stone floor polish, where it creates the effect you name specifically because it reacts with divalent alkali metals such as Ca and Mg present in stone surfaces. You are not going to eat this product, just treat your floor with it, right?. Standard safe handling procedures apply.
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With all that Leucidal, all that acidity (pH about 3.0 thereabouts?), plus low water activity, why bother with any other preservative? Remember that K-sorbate has much lower water solubility the lower the pH, so your immediate problem is one of pH adjustment to stop the sorbate from precipitating. But again, why bother? Leave it out.
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Try getting accepted as a “user” with UL Prospector. You may need an active industry chemist to qualify you. Once in, you can request samples from the many chemical ingredient suppliers who subscribe. I do know that independent consultants often get ignored by manufacturers and distributors, who don’t often realize these folks may be recommending their materials to their clients for further commercialization. Too bad, this is short-sighted.
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I was the batch validation and analytical chemist on record for the very first pilot batch of tolanaftate foot cream for OTC treatment of athlete’s feet. This was while working for Schering-Plough, which no longer exists. To this day, whenever I see that product on the store shelves (all private label now; patent expired) I have a sense of nostalgia.
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Lose the xanthan gum immediately, and as my esteemed colleagues have suggested use Bentone GEL instead of the raw Bentone colloid because this was only partially activated if at all. Also keep in mind that virtually all W/Si emulsions are unstable intrinsically over time. “Shake before using” on your label will help here too. And, oh yeah, homogenize but do not over-homogenize this or it will fail.
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Beeswax/borax is OK (quite “retro, actually) to use, scorpio35, and it will always form a w/o emulsion. You have too much water in this formula, you need to increase your oil ratio, plus as Perry alludes, you need to add a co-emulsifier called an absorption base to keep this together. Reduce the beeswax (and borax) and add a small level of sorbitan sesquioleate or sorbitan oleate, plus some lanolin or microcrystalline wax. If this were made with mineral oil, it would hang together nicely. If you are using all triglyceride oils (e.g. vegetable, botanical), then you may be SOL here and there may be no hope but to resort to mineral colloids.
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Better yet,lopamudra, don’t add any Na(x) EDTA at all if you are using any type of carbomer including Ultrez. This is an electrolyte and it WILL crash the acrylate polymer chain extension resulting in poor or no viscosity. If you have to use it for whatever reason, add it after you have hydrated the Ultrez and don’t use much of it or you will be defeating the purpose of the Ultrez.
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Holy crap, that is a lot of PVP K-90! That is your sole problem here, both with the flaky ppt and with the lack of gel firmness in the end product. Lower that to 2% or less and you should not see flaking, plus you should have a firm w/s pomade. Even better, use PVP K-30 as johnb suggests.