Polyurethane elastomers prepared from high equivalent weight polyahls
Patent 4687851 Issued on August 18, 1987. Estimated Expiration Date: 
August 15, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 15, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3445525 Internal mold release agent for use in reaction injection molding Patent #: 4519965 InventorApplicationNo. 06/766152 filed on 08/15/1985US Classes:544/398, Chalcogen attached indirectly to the piperazine ring by nonionic bonding544/401, The chalcogen is single bonded to both acyclic carbon and hydrogen546/248, Chalcogen attached indirectly to the piperidine ring by nonionic bonding546/312, Chalcogen attached indirectly to the six-membered hetero ring by nonionic bonding564/505PolyoxyalkyleneExaminersPrimary: Welsh, Maurice J.International ClassesC08G 18/00 (20060101)C08G 18/48 (20060101) C08G 18/50 (20060101) C08G 65/00 (20060101) C08G 65/26 (20060101) AbstractThe disclosed invention is a polyurethane and/or polyurea polymer which is the reaction product of a reaction mixture comprising(a) a polyisocyanate, and(b) a polyether polyahl having an equivalent weight of at least about 2000 and a level of unsaturation of less than 0.1% by weight.The polyurethane and/or polyurea polymer of this invention is an elastomeric material having surprisingly good properties. In particular, the polyurethane and/or polyurea is highly resilient and has excellent tensile properties. |
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