Polyurethane-56 is an inorganic chemical compound, a segmented block copolymer derived from urethane and synthesised from isocyanates.
Il nome definisce la struttura della molecola:
- "Polyurethane" è un termine che descrive una classe di polimeri ampiamente utilizzati in varie applicazioni grazie alla loro versatilità e proprietà desiderabili come durata, flessibilità e resistenza all'abrasione e variazioni di temperatura.
- "-56" è un riferimento al tipo o al grado specifico del poliuretano, che può essere caratterizzato da fattori quali i tipi di isocianati e polioli utilizzati, le loro quantità relative e la presenza di eventuali additivi. . Si tratta di una designazione utilizzata per differenziare le diverse strutture molecolari o varianti del polimero. Nella chimica cosmetica, questi numeri possono aiutare i formulatori a identificare le caratteristiche o i comportamenti specifici di un determinato ingrediente, in particolare quando una famiglia di sostanze chimiche ha più derivati o forme.
Significant substances used in the production method:
4,4'-Isopropylidenediphenol, poly(1,4-butanediol)-3, Hydroxypropyl Methacrylate, isophoronediisocyanate (IPDI).
Description of raw materials used in production with their functions.
- 4,4'-Isopropylidenediphenol (Bisphenol A). Provides the rigid structure to the polymer and acts as a backbone for the polymer chain.
- Poly(1,4-butanediol)-3. A polyol that provides flexibility and contributes to the mechanical properties of the polyurethane.
- Hydroxypropyl Methacrylate (HPMA). A monomer with hydroxyl functionality, improving adhesion and chemical resistance.
- Isophorone Diisocyanate (IPDI). A diisocyanate used as a cross-linking agent to form urethane bonds, imparting strength and stability to the polyurethane.
Step-by-step summary of industrial chemical synthesis process.
- Poly(1,4-butanediol)-3 and 4,4'-Isopropylidenediphenol are reacted with IPDI to form a prepolymer.
- HPMA is then introduced into the mixture, reacting with the free isocyanate groups to extend and crosslink the polymer chain.
- The reaction continues until the desired polyurethane forms.
What it is used for and where
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.
CAS: 1342288-58-7
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.
