Does cationic polymer help deposition of bad things like CMIT MIT from Shampoo?

Cationic polymers from Shampoo help and increase the deposition of ingredients like Piroctone olamine and zinc pyrithione which is good thing.
will it increase the deposition and retention of bad thing like CMIT MIT too? 

If not, why not? 

How does polymers choose what should it help deposit and what not? 

Comments

  • chemicalmattchemicalmatt Member, Professional Chemist
    I do not think CMIT/MIT will deposit, especially at 10ppm. Polyquats must form coacervates with the surfactants and those coacervates must bring with them only whatever they can associate with, dimethicone being the most dependable.  
  • I do not think CMIT/MIT will deposit, especially at 10ppm. Polyquats must form coacervates with the surfactants and those coacervates must bring with them only whatever they can associate with, dimethicone being the most dependable.  
    Thanks for sharing your opinion.

    Yes 10ppm is very small amount but my concern was this
    Anti dandruff ingredient like Piroctone olamine for example is used up to 1% with a polymer in shampoo and 0.1-0.3% in a leave on product. So it looks like from this 1% in shampoo at least 0.1-0.3% is deposited with the help of polymer.

    Now if we consider 10ppm CMIT instead of 1% Piroctone olamine, if 1-3 ppm CMIT gets deposited, it would not be a good thing because we don't want any amount of that. 




  • PhilGeisPhilGeis Member, Professional formulator
    edited February 12
    Suggest 5 ppm for the CMIT/MIT product.  Might check stability - CMIT is unstable with ZPT, another hydoxamic acid-based active.   Not aware of data for piroctone.
  • PhilGeis said:
    Suggest 5 ppm for the CMIT/MIT product.  Might check stability - CMIT is unstable with ZPT, another hydoxamic acid-based active.   Not aware of data for piroctone.
    Thanks for suggestion. 
    I am currently using 3ppm CMIT MIT+100ppm formalin+ 1000ppm tetrasodium EDTA in cleansing products. 
    I am not using zpt or Piroctone olamine is cleaning product.

    My concern was if guar hptc deposits CMIT in hair too the same way as it deposits zpt and Piroctone olamine from Shampoo.
    Any comments on this issue?
  • PhilGeisPhilGeis Member, Professional formulator
    CMIT aq solubility is much greater than those - I'd not worry
  • PhilGeis said:
    CMIT aq solubility is much greater than those - I'd not worry
    That is good.
    Thanks
  • PhilGeisPhilGeis Member, Professional formulator
    and it is not "bad"
  • PhilGeis said:
    and it is not "bad"
    I mean it is bad if it was deposited in hair by polymers. Isn't it?

    If it doesn't deposit then it is not bad as you say. 
Sign In or Register to comment.