A breakthrough in MDI cast elastomer technology: Bayer MaterialScience introduces line of MDI amine-curable prepolymers
A breakthrough in MDI cast elastomer technology: Bayer MaterialScience introduces line of MDI amine-curable prepolymers Bayer MaterialScience (BMS) continues its leadership in polyurethane chemistry with the introduction of the Baytecw MAC (MDI amine cured) prepolymer product line. The new Baytec MAC prepolymers, which complement currently available TDI-based prepolymers, are now available for sampling and will be commercially available later this year.
The Baytec prepolymers, consisting of novel polyester and polyether prepolymers produced from a specialty diphenylmethanediisocyanate, demonstrate reactivities similar to those of corresponding, free-monomer stripped 2,4-TDI prepolymers when extended with diamine co-reactants such as MbOCA and MCDEA,thereby producing polyurethaneurea elastomers with comparable physical properties. This represents a breakthrough in MDI cast elastomer technology,enabling formulators for the first time to produce MDI-based polyurethaneurea cast elastomers with superior mechanical properties and performance. Until now this was not possible, because the reaction of a MDI prepolymer with either an aliphatic or aromatic amine was too fast to be of any practical utility.
The processing and performance advantages of the new Baytec prepolymers include:
broader processing latitude compares to glycol chain-extended MDI hot cast systems;
low viscosities at processing temperature;
beneficial effect of free-MDI monomer on elastomer properties;
overall, property profile equal to or superior to TDI polyurethanerurea elastomers;
outstanding abrasion and tear properties;
low compression sets; and
non-MbOCA curatives may be successfully employed
Furthermore, MDI-based prepolymers offer another significant benefit compared with conventional TDI- based prepolymers: eliminating the concerns of TDI exposure in the workplace.
“Polyurethaneurea cast elastomers based on MDI chemistry are now a reality,” explained Dr Ashok Sarpeshkar, Principal Scientist, Cast Elastomer Group, Specialty System Group for BMS. “For the first time, with the introduction of the Baytec MAC prepolymer product line, the hot-cast elastomer industry now has MDI-based prepolymers that may be processed similar to TDI prepolymers using the same equipment.”
For more information about Bayer's Baytec MAC prepolymer product line, call 1-800-662-2927 or visit: www. BayerMaterialScienceNAFTA.com
BMS LLC is one of the leading producers of polymers and high- performance plastics in North America and is part of the global BMS business with nearly 19,000 employees at 40 sites around the world and 2005 sales of 10.7 billion euros. Our innovative developments in coating, adhesive and sealant raw materials, polycarbonates, polyurethanes and thermoplastic urethane elastomers enhance the design and functionality of products in a wide variety of markets,including the automotive, construction, electrical and electronics, household and medical industries, and the sports and leisure fields. Our inorganic basic chemicals unit produces chlorine and related essential products for the chemicals industry. Let us give life to your vision. Bayer MaterialScience– where vision works.
Bayer Corporation, headquartered in Pittsburgh, is a subsidiary of Bayer AG,an international health care, nutrition and innovative materials group based in Leverkusen, Germany. In North America, Bayer had 2006 net sales of e7.8 billion and employed 17,200 at year end. Bayer's three subgroups, Bayer HealthCare,Bayer CropScience and Bayer MaterialScience, improve people's lives through a broad range of essential products that help diagnose, prevent and treat diseases; protect crops and enhance yields; and advance automobile safety and durability. Bayer AG stock is a component of the DAX and is listed on the New York Stock Exchange (ticker symbol: BAY).
