Abstract: A method for manufacturing a low density rubber foamed body is provided which comprises the steps of forming a sheet from a mixture of 100 parts by weight of natural rubber or a synthetic rubber, 10 to 80 parts by weight of a foaming agent, and 0.5 to 15% by weight of a crosslinking agent; enclosing said sheet within a mold and heating said mold under pressure from the exterior to thereby foam said sheet; forcibly cooling said mold; and releasing a foamed body from said mold. When 10 to 60 parts by weight of a thermoplastic synthetic resin are further added to the mixture, a rubber foamed body of still lower density and lower shrinking property is obtained.

Abstract: A continuous production process for making a slab of polyurethane foam comprises preparing a foamable polyurethane composition, continuously feeding the composition to a horizontally moving trough to form a foaming mass on the trough, continuously pressing the top surface of the foaming mass with a pressure means over a zone including a zone extending from the foaming completion point to a point just prior to the completion of curing so as to make flat the top surface of the foaming mass, and horizontally moving the pressure means in synchronism with and in the same direction as the trough. Preferably, the composition is fed to the trough at such a rate as to produce a slab about 40 mm to 250 mm thick. The process can produce at a low cost polyurethane foam slabs which have no cavities and no cracks and which therefore have a uniform density or porosity.

Abstract: A mold equipment comprises a water tub having a metal mold transfer conveyor therein, a first lift chamber for placing the metal mold onto a first lift from the outlet side of said conveyor and lifting it to an upper stage of the first lift chamber, a first push-in cylinder for transferring the metal mold from the outlet of the first lift chamber into a ceiling oven including a conveyor and held in an atmosphere of curing, a second lift chamber for placing said metal mold onto a second lift from the outlet of the ceiling oven and lowering it to a lower stage outlet, a second push-in cylinder for transferring the metal mold from the outlet of the second lift chamber into a mold release work station including a conveyor, a third lift chamber for placing the metal mold onto a third lift at the outlet of the mold release work station and lowering it to the position of the mold transfer conveyor in the water tub, and a third push-in cylinder for transferring the metal mold into the water tub from the outlet of sai

Abstract: A resilient hydrophobic foamed polymer obtained by reacting a mixture of an isocyanate terminated urethane prepolymer and a polyisocyanate (A) with aqueous material, said prepolymer being relatively hydrophilic and the reaction product of a molar excess of a polyisocyanate (B) with a polyetherpolyol having from 15 to 50% by weight of oxethylene content, said aqueous material having a water content between about 15 to 150% by weight based on said prepolymer, the amount of said polyisocyanate (A) ranging between about 5 to 15% by weight based on said prepolymer, said polyetherpolyol being selected from the group consisting of (a) the addition polymerization product of a starting material, ethylene oxide and another epoxide and (b) a mixture of at least two of the following:(1) The addition polymerization product of a starting material and ethylene oxide;(2) the addition polymerization product of a starting material and an epoxide other than ethylene oxide;(3) the addition polymerization material, ethylene oxide

Abstract: An antistatic polyurethane foam contains quaternary ammonium salt as an antistatic agent. The quaternary ammonium salt is added either to a raw material for polyurethane foam or to a prepared polyurethane foam by causing the foam to be impregnated with a solution containing the quaternary ammonium salt and drying it.