Chemist77
Forum Replies Created
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Then it’s ok but choose your grade wisely and make sure that there is no allergic reaction. Some kids might develop it but it’s rare.
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Are you going to formulate a diaper rash cream??????
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You have to optimize the formula by doing it as same as earlier, then go one step at a time. Since it is a baby product I am sure you can dedicate your time and efforts by optimizing and bringing out the best.
Yes you can start by keeping the formula same and adding Isoamyl laurate or any other product that seems better. You can follow Bobz advice as well, he is a senior and I am sure his suggestions are better than mine. -
@Perry BTW this site of yours is pure dope, even FB pales before it. Did you know it is highly habit forming??????
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You can try Isoamyl Laurate which is very very smooth and light, am sure it can be used for baby products too.
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I agree with vitalys on Titanium Dioxide, it would highlight the tones of your brown and yellow pigments if it is for a light skin. Maybe a filler can help you too with a better coverage e.g. Nylon -12 or BPD series polymers from Kobo. As for the addition of blue pigment you have to do the color matching for the skin tone that it is going to be used for.
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For sure you are lacking on Iron oxides, try to add little Black Iron Oxide too. It will enhance the effect of your brown and yellow oxide, if not then take out a little Zinc Oxide and stick to the same level of brown and yellow oxides and see where you stand on coverage. Sorry it’s not a bull’s eye but then color cosmetics is all about trials and more trials.
Cheers
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@Bobzchemist Is it ok if cyclomethicone is is added as cool down phase, since cyclomethicone as such is highly evaporative and heating it to 75C would accelerate the evaporation and the final formula may not have as much cyclomethicone as intended.
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Try Cetyl Ricinoleate and Oleyl Erucate by part replacement of some fatty alcohols and maybe complete removal of fatty acid, with this combo you can get rid of jojoba oil as well and probabbly get a velvety satin feel. @Bobzchemist & MakingSkincare, by removing all the fatty alcohols and fatty acid Priya would end up with an unstable emulsion. Arlacel 2121 aint robust enough as shown in few comparative studies, though again I would stick to the ‘trial & check’ method. Please correct me if I am wrong.
cheers
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@Perry great one.
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@Chemwizard IIRC correctly it was Selvol Ultalux FA. You can find further information on their website mentioned below. I liked the end results though the final choice depends on the viscosity you are looking for. Since these are partially hydrolyzed grades you have to heat and hold for at least 30 minutes and thats what I did too.
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Are you talking about ‘rub-in’ time or really the penetration into the skin??????? Because these 2 terms are entirely different.
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Since I haven’t used Aculyn 88 I couldn’t comment on that, chemically same but still I haven’t used this grade.
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If your PVA quality is consistent and from a reputed company then all I could think of is either a problem with water source or the utensils used to prepare the dispersion. Beats me for any other reason.
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U r welcome
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Apart from the origin, the basic function remains same i.e. thickening and stabilizing the emulsions or the formula in general. Their use is a matter of choice though again the compatibility with other ingredients has to be kept in mind. As for the thickening capability yes they differ in the yield values and hence they have different suspension abilities.
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My experience is to straight add to water and heat. Later you can add the alcohol and which is also very effective in de-aerating the PVA/water solution. Make sure you choose the right viscosity PVA, to start with you can check with SEKISUI. They have different grades, guess I used Selvol FA and the product came out pretty darn good.
Hope that helps. -
@Bill hence we use polymers to take it towards non newtonian behavior but keeping in mind the ever present gravity and thats where the optimization and selection of ingredients come into play.
cheers
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One at a time, why dont you start by eliminating that silicone gum??? On the second go you could reduce the salt as you already have some in betaine as well. Once you are done with these, evaluate the shampoo again and see where you stand on moisture and lather harshness.
Or reduce the silicone gum to half and come down to 2% on salt and check again. -
@Bobzchemist Thats what!!!!!!!!!!! So higher degree of ethoxylation doesnt mean higher aq. solubility?????? Depends what is being ethoxylated???????
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@merit87 Congrats, finally you got the reply. But for a dumbhead like me the clarification is more confusing than the original puzzle
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See the post below by Bobzchemist and check the link, wonderful article
Suspension ability is a function of yield value/yield stress, not viscosity/thickness. It’s possible to formulate a relatively thin gel with good suspending capacity.
(http://www.lubrizol.com/Home-Care/Documents/Technical-Data-Sheets/TDS-244-Measurement-Understanding-Yield-Value-Personal-Care-Formulations.pdf )How this holds up for high-surfactant formulas isn’t something I’m familiar with. -
nasrins viscosity only slows down the sedimentation process otherwise its the yield value that controls suspension properties.
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Technically they are but trade names don’t have poly
just a banter nasrins -
You mean the MW is of 6000 compared to 600??????????