Back to results
US 4,266,043 AGranted
Resilient hydrophobic foamed polymer
AssigneeToyo Rubber Chemical Industrial Corporation
InventorsOsamu Fujii, Toshio Kishimoto, Akio Kobayashi
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeToyo Rubber Chemical Industrial Corporation
InventorsOsamu Fujii, Toshio Kishimoto, Akio Kobayashi
Estimating the term…
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 and another epoxide, and said starting material being selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol; dipropylene glycol; butylene glycol; hexylene glycol; glycerol; trimethylolethane; trimethylol propane; 1,2,6-hexanetriol; pentaerythritol; .alpha.-methylglycoside; sorbitol and sucrose.
A resilient hydrophobic foamed polymer obtained by reacting a mixture of an isocyanate terminated urethane prepolymer and a polyisocyanate (A) with water, 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 oxyethylene content, said water amounting to 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:
A method of producing a resilient hydrophobic foamed polymer, comprising the steps of reacting a polyetherpolyol containing 15 to 50% by weight of oxyethylene with a molar excess of a polyisocyanate (B) so as to prepare a relatively hydrophilic urethane prepolymer, and reacting a mixture of the prepolymer and about 5 to 15% by weight of a polyisocyanate (A) based on the prepolymer with about 15 to 150% by weight of water based on the 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:
Dependencies are inferred from the claim text.