Ruben
Forum Replies Created
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ebay!
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@milliachemist Maybe the trophy will go to Argentina this time
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@Bobzchemist. No problem. I, and I assume all of us, appreciate your input to almost every problem or question posted. I have learned a lot from your expertise.
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I am confused. Harry’s Cosmeticology 8th edition (Table 13.2, pag 267) lists PCA and lactate as NMF
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I emulsified 30% silicone in water with 2.5% of Momentive’s Silsoft SF1540 (Cyclopentasiloxane (and) PEG/PPG-20/15 Dimethicone). At the end I got a very nice thick lotion that is easily spreadable.
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As of this morning the world population is 7,232,701,900. So it seems men do not use toothpaste, sunscreen and soap as often as we thought
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I don’t think a sanitizing wand will be effective. UV light is not penetrating, doesn’t work well on porous structures, any scratch on a surface that can harbor microorganisms will be inaccessible to UV light, and the germicide effect is a function of power of the lamp and duration of the application. So it will be hard to judge the effectiveness unless you can measure the dose and you know the susceptibility of the microorganisms to UV light.
The most dangerous aspect is that can give a false sense of security.
The health care industry uses UV systems to sanitize rooms when people are not present. Still I don’t how effective is in areas that are not “illuminated” by the UV. -
In fact retinol comes dissolved in corn oil or fractionated coconut oil, among other oils, so it must be stable. I was thinking about silicone too. I tried silicone with other actives and I’m happy with the results. Thank you simona for the link. This proves there is a silicone-based retinol product in the market.
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@Zink I’ve been thinking about making an anhydrous retinol serum, but I haven’t seen any product of this type in the market and wonder why? Is it just because of the greasy feel? Or maybe there is another reason.
There is a company that offers retinol in cyclodextrin that is supposed to be stable -
I think 7% ewax is not enough emulsifier for a 50% oil phase
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Thank you all for your input. I was planing to avoid the oxidation issue by using an anhydrous system made with 100% silicone, but apparently the concept is protected with a patent. So, I think I will explore Mark’s suggestion on using other stable forms of ascorbic acid in a water system. Besides, silicone gel is expensive. Thanks again. Ruben
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Thank you Bobzchemist. I’ll ask for a sample and give it a try
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I like BTMS as well. The only problem I found is the smell. In some formulations, especially anhydrous ones, I can smell ammonia.I haven’t had that problem with emulsions, though.
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According to Croda BTMS-50 is “non-irritating on the skin”
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Polyglyceryl-5-oleate is a PEG-free emulsifier that can serve this purpose. You can get a transparent oil gel as far as you don’t introduce air bubbles while mixing.
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@Bobzchemist. Thank you taking the time to answer my question so comprehensively. This is exactly what I need. I am going to start with a Muller and then probably get a ball mill grinder. What size of grinding media do you think I need to achieve 50 microns? Thanks again.
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@milliachemist. I checked the specs. of a TiO2 supplier and they guarantee a particle size less than 20 nm. I wonder if you really need particles that small to avoid the gritty feel. Herbnerd mentioned talk. I found the finest talc is about 10 microns.
I’ve been trying to grind a compound to a very fine powder to suspend it in a an anhydrous system. The best I did so far is 150 microns (100 mesh) using a mortar and pestle. I still haven’t tested it in my formula, but I have the feeling it will be too coarse. I probably need to get a ball mill. Thanks
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Robert,
What kind of mill do you suggest to get ultra fine particles? Any idea of idea of the particle size needed to avoid a gritty feel.
Thank you
Ruben -
Obviously, slow mixing during cool down is not possible with a blender, or at least not ideal. The holding-part-for-that-long can be solved with a stock pot clamp
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Jasmine15. If you are successful at making lotions with a stick blender, what you probably need is just a bigger blender. I don’t know what your budget is, but commercial stick blenders can go from $150 to 600 or more depending on the power and other things. Check this one “Waring WSB50 12″ Big Stik Variable Speed…” Less than $300 at http://www.webstaurantstore.com/waring-wsb50-12-big-stik-variable-speed-heavy-duty-immersion-blender-120v-750w/929WSB50.html
I heard many people use these blenders for small commercial operations successfully -
I just found that they claim the ascorbic acid is “encapsulated” in dimethicone copolymer??
Look down in the Comments section -
After Mark’s suggestion about using an anhydrous system to preserve vitamin c, I found this serum with vitamin c and caffeic acid that contain the following ingredients (I copied exactly as they were listed):
Cyclomethicone (slip agent), Dimethicone Crosspolymer-3, Ascorbic acid (antioxidant), Dimethicone (slip agent), Bis-vinyl Dimethicone/Dimethicone Copolymer (slip agent), Tetrahexyldecyl Ascorbate (antioxidant), Tocopherol (antioxidant), Caffeic acid (antioxidant).
I assume ascorbic acid and caffeic acid are not soluble in silicone at all, so I wonder how they were incorporated into the serum. Are they just in suspension?
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I’ve read the patent. My question is how people/companies avoid infringing the patent.
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Perry. Is PVM/MA Decadience Crosspolymer an ingredient similar to Pemulen? Thanks