Cellular material
Patent 4045380 Issued on August 30, 1977. Estimated Expiration Date: 
August 30, 1994. 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 30, 1994. 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 2271498 2404171 2807596 3354105 InventorsApplicationNo. 05/547061 filed on 02/13/1975US Classes:521/101, Ingredient is bituminous or asphaltic material521/125, Organic metal compound contains a Group I or Group II metal atom521/128, Ingredient is a nitrogen containing compound521/132, Said ingredient is substantially nonvolatile material, e.g., hydrocarbon waxes, greases, etc.521/148, With conjugated diene reactant521/150, From reactant containing two or more ethylenic unsaturated groups521/155, Cellular product derived from a -N=C=X containing reactant wherein X is a chalcogen atom521/902, CELLULAR POLYMER CONTAINING AN ISOCYANURATE STRUCTURE521/99, Cellular product formation prior to or during solid polymer formation in the presence of a stated ingredient other than water524/571, Conjugated diene hydrocarbon monomer524/572, Adding nonreactive material to chemically modified solid polymer524/575.5, Natural rubber524/65, Coal derived additive, e.g., lignite, etc.524/66, Tar or pitch524/705Coal or bituminous material, extract or derivative thereof, oil shale, or fatty still residue thereof, as DNRMExaminersPrimary: Briggs, Sr., Wilbert J.Attorney, Agent or FirmForeign Application Priority Data1972-04-06 UKAbstractA cellular material may be made by vulcanizing a mixture containing between 15% and 50% of an ebonite-forming rubber and sufficient vulcanizing agents to form an ebonite with the rubber, between 5% and 87% of a coal digested in pitch, tar or tar oil, between 10% and 40% of a particulate filler and a chemical blowing agent, whereby an ebonite structure is formed, so that, during the vulcanization, the chemical blowing agent decomposes or reacts to produce a gas, the viscosity of the composition during the production of the gas increasing whereby cells are retained in the composition. The digested coal has a penetration, converted to a Ring and Ball softening point of 85° C, of between 10 and about 45. Cellular plastics material produced by this process may contain at least 25% by volume of closed cells. | |
