Process for composite polymer beads
Patent 4447475 Issued on May 8, 1984. Estimated Expiration Date: 
May 8, 2001. 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.
May 8, 2001. 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 3884871 Process for preparing direct imaging pressure fixable magnetic toners Process for making composite magnetic material Patent #: 4211664 InventorsAssigneeApplicationNo. 06/220024 filed on 12/03/1980US Classes:427/213.31, With post-treatment of encapsulant or encapsulating material (e.g., further coating, hardening, etc.)252/62.54, Synthetic resin427/213.34, Solid-walled microcapsule formed by in situ polymerization428/402, Particulate matter (e.g., sphere, flake, etc.)428/900, MAGNETIC FEATURE524/459Solid polymer utilized contains vinyl alcohol unitsExaminersPrimary: Lovering, Richard D.Attorney, Agent or FirmInternational ClassesH01F 1/113 (20060101)B01J 20/28 (20060101) B01J 13/06 (20060101) B01J 13/14 (20060101) C08F 2/44 (20060101) H01F 1/032 (20060101) AbstractA process of incorporating non-polymeric particulate matter such as magnetic materials, pigments and minerals, into a cross-linked styrene-based polymeric matrix, which process comprises dispersing the non-polymeric particles with a polymeric dispersant in a medium containing one or more vinyl monomers and a crosslinking agent, and adding a polymerization initiator. Typical polymeric dispersants are copolymers, styrenes and tertiary-nitrogen-containing vinyl monomers. Non-polymeric particulate matter incorporated into polymeric beads by this process is resistant to chemical attack and the beads may be used to prepare composite adsorbents or ion exchange resins. | |
