Patents Examined by Marion McCarnish
  • No-bake foundry mixes and their use
    Patent number: 5859091
    Abstract: This invention relates to polyurethane-forming foundry binder systems and foundry mixes which comprise a foundry aggregate, said foundry binder system, and a liquid amine curing catalyst. The binder system comprises a polyol component containing a polyether polyol and a monomeric glycol, and an organic polyisocyanate component. The foundry mixes are used to prepare foundry shapes made from foundry mixes by a no-bake process.
    Type: Grant
    Filed: June 13, 1997
    Date of Patent: January 12, 1999
    Assignee: Ashland Inc.
    Inventors: Chia-hung Chen, Thomas E. Dando