Polyurethane foam sealing material and process for producing the same
AssigneeNHK Spring Co., Ltd.
InventorsTakao Maruyama, Koichi Kusakawa, Toshiaki Kimura, Noboru Murata
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Abstract
A flexible or semi-rigid open-cell, polyurethane foam sealing material prepared from a polyisocyanate and a polyol component, a major portion of said polyol component consisting of a polyol derived from a dimer acid or castor oil, castor oil, or a mixture thereof in the presence of a blowing agent, a foam stabilizer, a catalyst, and, optionally, a lipophilic filler.
Claims11
A flexible open-cell, polyurethane foam sealing material prepared from a polyisocyanate and a polyol component a major portion of which consists of (1) a polyol derived from a dimer acid having a number average molecular weight of 600 to 5000 and an average functionality of 1.6 to 4.0, or (2) castor oil or a polyol derived from castor oil having a number average molecular weight of 600 to 5000 and an average functionality of 3 to 4, or a mixture thereof in the presence of a blowing agent, a surfactant and a catalyst and having an air permeability of 10 cc/cm2/sec or less at a thickness of 10 mm.
A flexible open-cell, polyurethane foam sealing material prepared from a polyisocyanate and a polyol component a major portion of which consists of (1) a polyol derived from a dimer acid having a number average molecular weight of 600 to 5000 and an average functionality of 1.6 to 4.0, or (2) castor oil or a polyol derived from castor oil having a number average molecular weight of 600 to 5000 and an average functionality of 3 to 4, or a mixture thereof in the presence of a lipophilic filler, a blowing agent, a surfactant, and a catalyst and having an air permeability of 10 cc/cm.sup.2 /sec or less at a thickness of 10 mm.
A process for producing a polyurethane foam sealing material which comprises reacting a polyisocyanate and a polyol component a major portion of which consists of (1) a polyol derived from a dimer acid having a number average molecular weight of 600 to 5000 and an average functionality of 1.6 to 4.0 or (2) castor oil or a polyol derived from castor oil having a number average molecular weight of 600 to 5000 and an average functionality of 3 to 4, or a mixture thereof in the presence of a blowing agent, a surfactant, and a catalyst under such a condition as to provide a polyurethane foam having an air permeability of 10 cc/cm.sup.2 /sec or less at a thickness of 10 mm.
Dependencies are inferred from the claim text.