Forum Replies Created

Page 4 of 57
  • chemicalmatt

    Member
    May 24, 2024 at 12:17 pm in reply to: Incompatibility of dermosoft® OMP

    None that I can think of.

  • chemicalmatt

    Member
    May 24, 2024 at 12:15 pm in reply to: lip gloss stability problem

    Affirmative. Not compatible with most of those listed. Try Plan B.

  • chemicalmatt

    Member
    May 24, 2024 at 12:12 pm in reply to: Are these active surfactants and PQ7?

    Looks like “as is” activity concentrations to me. Considering PQ-7 is always 10% active, 0.025% doesn’t do much conditioning there. I also question adding 3.0% PEG-10 dimethicone when 1.0% will do fine.

  • chemicalmatt

    Member
    May 24, 2024 at 12:06 pm in reply to: Polyquaternium-37 & Quaternium-80

    First, let me agree - as usual - with @ketchito: polyquaternium-37 has different function and application than BTMS, so not to make a 1:1 correlation. On the other questions: yes, disperse PQ-37 into water first as it is difficult to hydrate when other materials are vying for water. Adding later will be MUCH more difficult unless it happens to be in the emulsion format like Salcare SC-96. Yes, PQ-37 will successfully allow oils & silicones, and much more than 10%, since it’s 3D structure in water makes for a Pickering effect with good apparent yield value; but…BTMS happens to be one of the best cationic emulsifiers for dimethicone. Finally, polyquaternium-80 has modest hair conditioning activity so I recommend 0.50% as floor. PQ-80 finds its best use in hair color retention formulations being a good film-former.

  • chemicalmatt

    Member
    May 24, 2024 at 11:48 am in reply to: Formulation Requirement of Floor Cleaner ?

    We do not hand out final formulas here @psemwal2010 , we only share knowledge. SHould you want to obtain a starter formulation I suggest visiting websites of the major surfactant manufacturers, such as Stepan, Pilot, Synesqo, etc.

  • chemicalmatt

    Member
    May 21, 2024 at 12:42 pm in reply to: Stabileze QM Discontinued

    Try Stabylen 30 from 3V Sigma USA or SpA depending on which continent you are on. Works same only pH range is a tad higher: 5.0 - 12.0

  • chemicalmatt

    Member
    May 21, 2024 at 12:23 pm in reply to: Alpha arbutin

    Add a little bit of lactic acid to steady the pH at 5.0 - 6.0 and a bit of mannitol to inhibit redox reactions with light, oxidizers.

  • chemicalmatt

    Member
    May 21, 2024 at 12:15 pm in reply to: Is SLS milder than ALS?

    Ammonium Lauryl Sulfate (ALS) is much milder than SLS, this is true. Same goes for the ethoxylates: ALES is milder on skin than SLES.

  • chemicalmatt

    Member
    May 21, 2024 at 10:33 am in reply to: Quats e Non- quats

    BTAC is the most substantial behenyl quaternary ammonium salt simply because it has the highest charge-mass ratio. The other behenyl and brassicyl quats have weaker ones, simple as that. Now if the user maintains contact with the other ones for a longer time - 20 to 30 minutes maybe - they might match BTAC. The brassicyl quats have a sensorial finish not nearly as soft as the behenyls, so keep that in mind. That could be the source of the “chalky” response.

  • chemicalmatt

    Member
    May 14, 2024 at 3:49 pm in reply to: EDTA gel viscosity problem

    I am with gordof here: why so much EDTA? It doesn’t make any sense. Is there a decimal point missing? Also not especially safe orally.

  • This formula needs a hydrotrope with all that anionic surfactant and glucoside, glucamide as ketchito points out. Try disodium cocoamphodiacetate or dipropionate - or sodium xylene sulfonate if you can bear that on your label - at low concentration and you may resolve this. Also consider which polymer size of Polyquaternium-10 used. The common one for cleansing products is 400, but if you happen to be using 30,000 well…fugettabottit.

  • chemicalmatt

    Member
    May 14, 2024 at 3:30 pm in reply to: Grainy lip balms / blooming issue / HELP!

    Besides the helpful advice from graillotion and Mike, all legit, I’ll add that addition of lower HLB polyglyceryl fatty esters are used in foods and cosmetics to solve this problem of crystallization. Try adding some polyglyceryl-3 diisostearate to the mix and find out.

  • chemicalmatt

    Member
    May 14, 2024 at 3:23 pm in reply to: Suncare Emulsions & FT

    Affirmative, if your formulation is an invert system such as w/o or w/Si then you’ll see that separation. All of these invert emulsions are intrinsically unstable at elevated or reduced temperature conditions. I’ve had many that were stable for many years at RT though.

  • chemicalmatt

    Member
    May 14, 2024 at 3:19 pm in reply to: Sedimentation problem (Problème de décantation)

    As said by @ketchito You will find that acrylic disruption especially with divalent salts such as Mg, Ca as found in “l’eau marin”. Also, the acrylic opacifiers have ranges of pH compatibility and you must always add into water first before anything else, never last.

  • chemicalmatt

    Member
    May 14, 2024 at 3:11 pm in reply to: Seeking Polymer Chemist for deformulation

    @Greglar the formulation you refer to may actually be a cross-polymer of cyanoacrylate/acrylic acid and that “soy” material could refer obliquely to the x-linker used. Essentially it is Super-Glue. This likely involves peroxide radical-initiated polymer synthesis, not simple mixing. Be advised of this if results from mixing are not favorable.

  • chemicalmatt

    Member
    May 4, 2024 at 1:48 pm in reply to: Need help with gel turbidity

    Sounds like an oil or similar lipid might have been added without pre-solubilizing in a surfactant cocktail. You used some good ones there attempting to mitigate but in my experience once that oil is dispersed into the carbomer gel it will not solubilize afterward. The other possibility is somebody added a cationic-charged material before the carbomer was neutralized. BTW, those cross-links are strong, it takes many months or years before they break down depending on how much UV exposure your gel gets. This is why we’ve always added benzephoenone-4 into clear carbomer gels for retail presence; 0.05% is plenty also.

  • chemicalmatt

    Member
    May 4, 2024 at 1:41 pm in reply to: Menthol Incorporation In Hair Removal Cream

    Menthol will dissolve directly into mineral oil or any other paraffinic. Plan your order of addition accordingly.

  • chemicalmatt

    Member
    May 4, 2024 at 1:39 pm in reply to: Strange phenomenon between paraffin oil and castor oil

    @Fekher first thing is CONGRATULATIONS! You discovered something unique and thanks for sharing. Now, get to that patent attorney office pronto my friend! OK, there is some “prior art” involved here. The fatty acid 12-hydroxystearic acid derives directly from castor oil hydrolysis. This is a known gellant for apolar oils such as mineral oil. It works on medium polarity oils too but not as well. What is surprising is how that castor oil underwent hydrolysis - alkali are used for this industrially - yielding all that 12-hydroxystearin. Even so, you got a pretty thick substance with only 1.0% castor oil too. Pretty cool, dude!

  • chemicalmatt

    Member
    April 26, 2024 at 12:57 pm in reply to: Improve W/O emulsion stability without increasing viscosity

    @LabGuy It must be restated here that virtually ALL invert emulsions are entropically unstable. You will generally find thermodynamic instability at 45C sooner or later with these creations, so don’t feel bad when it happens. Having said that, you were wise to include that BENTONE Gel to stabilize the continuous phase. The issue appears mainly in your water phase. Add much more NaCl, 3.0% will do, and reduce that Tween 80 in half. This may help but your chief problem here is the low level of water in there! Doing the math here and excluding the metal insolubles there is ~16% water and ~60% oils. Not good. You will need much more to keep this viable so some of that oil phase has to go. You may try increasing the Abil EM90, as higher the ratio of oil: water inside, the greater level of w/o emulsifier required. Honestly at this rate I would just forego a water phase entirely and go to an anhydrous system serum. Q.s. with esters and get on with your day.

  • chemicalmatt

    Member
    April 26, 2024 at 12:32 pm in reply to: Vitamin C + Alpha Arbutin Serum - Stability Issue

    @AMS It is not clear what is described by “PPG” or even “PEG-40” and those polyols (we know what those acronyms mean) are your key thickening ingredients. E.g. PPG-15 Stearyl Ether + PEG-40 Stearate: now we have something to go on. That combo would produce a nice emulsion, BTW, one that is oxidatively stable as well. You might also use a Poloxamer PPG/PEG block copolymer to achieve 1000 cps sustainably. But alas…

  • chemicalmatt

    Member
    April 26, 2024 at 12:11 pm in reply to: Master of Science in Cosmetic Science | UC Online

    I cannot recommend this program enough. It is the longest-lived MS Cosmetic Science program (USA) in existence for a reason.

  • chemicalmatt

    Member
    April 25, 2024 at 8:07 am in reply to: EDTA , viscocity

    @Aanchal If we assume CATC is cetyltrimethylammonium chloride (CETAC as we know it) the means of thickening that low solids formulation is NaCl, just plain sodium chloride salt. Add into the batch as a 20% solution at 40C and you will be surprised how much viscosity you will gain. This is the reason all those inexpensive hair conditioners on the market appear to be much richer than they are.

  • chemicalmatt

    Member
    April 25, 2024 at 7:59 am in reply to: Urea in shampoo

    @Hairlover I can only surmise the effect you observed with urea is one where the urea lifts the cuticles - literally swells the hair shaft - allowing more of the conditioning agent to incur. That would lead to a softer sensorial. Kudos to you for the discovery, my friend! A historical aside: back in the thioglycolate permanent wave era urea was used for this same purpose: lift the cuticle layer to allow faster penetration of thio into the hair cortex where it worked its cysteine cleavage chemical magic. If not for that Jennifer Aniston and her straight hair revolution we would all still be making money on perm kits.

  • chemicalmatt

    Member
    April 24, 2024 at 2:44 pm in reply to: Neck priming serum (silicone base)

    C12-15 alkyl benzoate is a fragrance fixative that is miscible with all those silanes, also with those esters. Triethyl citrate is also a fine fixative, but I am not so sure it will be miscible with silanes. It will be miscible with the esters though.

  • chemicalmatt

    Member
    April 24, 2024 at 2:35 pm in reply to: Scrub Formulation Separating

    @Xenk more information would be needed to give you an intelligent answer here, i.e. exactly what is SLSA (acronym violation: arrrgghhh!); how much SLSA is involved here solid state, likewise the CAPB; which “exfoliant” is used and how much; does “xantum” = xanthan and which grade/how much was used - a critical element. I could go on….

Page 4 of 57
Chemists Corner