"Descrizione" by admin (19344 pt) | 2023-Sep-20 19:13 |
Polyurethane-19 is an inorganic chemical compound, a segmented block copolymer derived from urethane and synthesised from isocyanates.
Significant substances used in the production method:
butanediisocyanate, polymer with 2,2-dimethyl-1,3-propanediol, 2,2-di(hydroxymethyl)butanol, 2,2-di(hydroxymethyl)propanoic acid, 2,2-di(hydroxymethyl)butanol, hexanedioic acid, tris(2-hydroxyethyl)amine salts, hydrazine, C1-8 alkanediamines.
The name describes the structure of the molecule:
Description of raw materials used in production and their functions.
Step-by-step summary of industrial chemical synthesis process.
What it is used for and where
It is a restricted ingredient as II/201 and III/62 a Relevant Item in the Annexes of the European Cosmetics Regulation 1223/2009. Substance or ingredient reported:
Trialkylamines, trialkanolamines and their salts. Do not use with nitrosating systems - Minimum purity: 99% - Maximum secondary amine content: 0.5% (applies to raw materials) - Maximum nitrosamine content: 50 microgram/kg - Keep in nitrite-free containers
Hydrazine, its derivatives and their salts
Cosmetics
Binder agent. Ingredient that is used in cosmetic, food and pharmaceutical products as an anti-caking agent with the function of making the product in which it is incorporated silky, compact and homogenous. The binder, either natural such as mucilage, gums and starches or chemical, may be in the form of a powder or liquid.
Hair fixative. This ingredient has the ability to create, with its protective film, stiffness and hold in the hair, and also has the ability to form, with its hydrophilic and elastic properties, bonds between the hair fibres, to keep the hair in a particular shape for a certain time.
It appears as a white powder or colorless liquid.
Safety
Urethane (also called ethyl carbamate) is a by-product of fermentation and is considered a genotoxic agent.
Polyurethanes are rather complex, inert and biostable materials that are also used in biomedical applications. They are typically synthesised by the reaction of a glycol or polyol with polyisocyanate or diisocyanate. It is known that exposure to isocyanates can cause asthma, contact allergies, conjunctival and skin irritation. However, a study by the Cosmetic Ingredient Review Expert Panel in 2017 found that the rates of harmful residues are not significant for human health.
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