Process of manufacturing a microporous sheet material
Patent 4237083 Issued on December 2, 1980. Estimated Expiration Date: 
February 13, 1999. 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.
February 13, 1999. 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 3228896 3351495 3536796 Hydrophobic microporous materials and process for producing same Battery separator Patent #: 4024323 InventorsAssigneeApplicationNo. 06/011900 filed on 02/13/1979US Classes:264/41, PORE FORMING IN SITU (E.G., FOAMING, ETC.)264/179, With purifying or replenishing of bath264/45.3, Incorporating particulate material, fibers, or batts in a random distribution within a foamed body521/62, Mixture of solid polymers present during cell formation521/64, Removing a liquid to form a cellular product524/296, Only two carboxylic acid or ester groups directly attached to an aryl group, e.g., phthalic acid, etc.524/314Ester derived from dicarboxylic acidExaminersPrimary: Anderson, PhilipAttorney, Agent or FirmInternational ClassesB29C 67/20 (20060101)B01D 39/08 (20060101) C08J 9/28 (20060101) C08J 9/00 (20060101) H01M 2/16 (20060101) AbstractA process of manufacturing a microporous sheet by forming a blend of a polyolefin, silica and a water insoluble plasticizer, forming a sheet from the blend, and contacting the sheet with water for a time sufficient to render the sheet microporous. The plasticizer, being essentially insoluble in water, is easily separated therefrom and recycled. The preferred plasticizers are dialkyl phthalates and dialkyl adipates having between about two and about eleven carbon atoms in the oxo-alcohol moiety. | |
