Two Or More Heterocyclic Reactants Containing Rings Of One Oxygen And Two Carbon Atoms Patents (Class 528/419)
  • Process for the purification of polyethers using a tubular coil evaporator
    Patent number: 4143072
    Abstract: This invention relates to a process for the removal of troublesome secondary products, particularly small quantities of water, solvents, low molecular weight glycols, and pungent-smelling substances, from polyethers by means of a tubular coil evaporator.
    Type: Grant
    Filed: April 27, 1978
    Date of Patent: March 6, 1979
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hartmut Hetzel, Pramod Gupta, Hans-Joachim Sandhagen
  • Polymerizable compositions containing highly fluorinated aliphatic sulfonyl protonic acid catalyst
    Patent number: 4115295
    Abstract: Two-part polymerizable compositions are described which contain (a) organic material having epoxide functionality, (b) organic material having hydroxyl functionality, and (c) a catalyst comprising highly fluorinated aliphatic sulfonyl protonic acid or a compound capable of liberating such acid. The compositions polymerize essentially completely at room temperature (or at slightly elevated temperatures). The polymerized compositions have desirable dielectric properties and are therefore especially useful for potting electrical components.
    Type: Grant
    Filed: April 26, 1976
    Date of Patent: September 19, 1978
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Janis Robins, James E. Kropp, Chung I. Young