Polyisobutenes
Patent 4152499 Issued on May 1, 1979. Estimated Expiration Date: 
December 23, 1997. 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.
December 23, 1997. 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 2559984 2918508 3634383 3726842 3778487 InventorsApplicationNo. 05/863914 filed on 12/23/1977US Classes:525/381, Three or more amine groups508/293, Nitrogen attached directly or indirectly to the hetero ring by nonionic bonding526/237, Material contains metal halide, boron halide or organic complexes thereof, hydrogen halide, elemental halogen, or compound containing only halogen atoms526/272, Interpolymerized with hydrocarbon monomer526/348.7, Isobutylene585/18, Acyclic585/525B-containing catalystExaminersPrimary: Holler, AlanAttorney, Agent or FirmInternational ClassesC08F 10/00 (20060101)C08F 10/10 (20060101) C08F 8/00 (20060101) C08F 8/32 (20060101) Foreign Application Priority Data1977-01-22 DEAbstractIsobutene polymers having a mean degree of polymerization P of from 10 to 100 and a proportion E of double bonds, capable of reaction with maleic anhydride, of from 60 to 90%, where E=100% corresponds to the calculated theoretical value for the case where each molecule of the isobutene polymer contains such a reactive double bond. |
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