Fomrez: Polyester Polyols from Lanxess

Polyol Chemistry

Polyols are divided into structural groups as polyether polyols or polyester polyols. Polyether polyols are produced through the reaction of epoxides with compounds containing active hydrogen atoms. Polyester polyols are typically produced through the condensation reaction of a glycol with a dicarboxylic acid. When selecting polyester polyol, functional group and molecular weight are quite important. Polyols with high molecular weight (2000–10000) are used to produce more flexible polyurethanes, while lower molecular weight products are used to produce more rigid polyurethane products. Polyols contain reactive hydroxyl (OH) groups that react with isocyanate (NCO) groups on isocyanates to form polyurethane. Polyols used for flexible applications contain a small number of functional groups (hydroxyl groups). Polyols selected for rigid applications contain a greater number of functional groups, namely hydroxyl groups. They are used to increase the load-bearing properties of polyurethane foams and to impart toughness to cast elastomers. Polyester polyols provide wear and cut resistance to polyurethanes. Elastomers, sealants and adhesives are produced using special polyols and exhibit superior weather resistance and good resistance to chemical and environmental attack. Polyol polyester provides better adhesion while increasing wear resistance and overall hardness. FOMREZ® polyester polyols are an extremely versatile material family used in many applications worldwide. LANXESS Urethane Systems has in-house technical capabilities to develop, produce and support all these chemicals. LANXESS is a global polyurethane raw material supplier for coatings, adhesives, sealants and elastomer (CASE) applications. FOMREZ® polyester polyols are raw materials combined with diisocyanates to provide a wide range of properties and are used in many different applications.   Ece Okçu C.A.S.E. PU Sales Manager Kimsel