Patent · US Expired

Polyurethane foams prepared by a quasi-prepolymer technique

US3968061A · kind A · utility

1Cited by
5References
10Claims
0Family size

Assignee

Inventors

Key dates

Filing dateDec 30, 1974
Grant dateJul 6, 1976
Priority date—
Expiry dateDec 30, 1994

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC08G2110/0066
  • WIPO fieldMacromolecular chemistry, polymers
  • WIPO sectorChemistry

Abstract

This invention relates to a method of preparing polyurethane foam which comprises the steps of forming an isocyanate-terminated prepolymer by reacting a polyisocyanate with a copolymer having an --OH-functionality greater than 2.00 but less than 3.00 derived from an .epsilon.-caprolactone, an epoxide and a mixture polyhydric alcohol chain initiators; and reacting said prepolymer in the presence of a blowing agent and a catalyst with a reactant mixture which comprises a chain extending agent having at least two functional groups each containing an active hydrogen atom, dissolved in a liquid copolymer of a lactone and an epoxide. The polyurethane foams are useful in the manufacture of shoe soles.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.