Patents Examined by p Morton Foelak
  • Open-celled flexible polyurethane foams and a process for their production
    Patent number: 5039712
    Abstract: Open-celled, elastic, flexible polyurethane foams are made without using a chlorofluorocarbon blowing agent. A polyisocyanate is reacted with a polyether in the presence of water and from about 0.1 to abour 10% by weight (based on polyether) of an organic blowing agent selected from dicarbonic acid alkyl esters, dicarbonic acid cycloalkyl esters, dicarbonic acid benzyl esters and combinations thereof. Optional starting materials include catalysts, chain lengthening agents, emulsifiers and other commonly used additives.
    Type: Grant
    Filed: February 26, 1991
    Date of Patent: August 13, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventor: Martin Brock