Mitsui Chemicals, Inc.

Masahiro Isobe

Tsukuru Izukawa

Kazuhiko Ohkubo

Satoshi Yamasaki

Ariko Nishikawa

Shinsuke Matsumoto

Seijiro Sakai

Usaji Takaki

Tadahito Nobori

Tamotsu Kunihiro

Kaoru Ueno

Akihiro Imai

Mikio Matsufuji

Kazuhiko Okubo

Yasunori Hara

Fumio Yamazaki

Atsuko Tachibana

Fumiaki Hirata

An aqueous polyurethane resin is prepared by reaction of an isocyanate group-terminated prepolymer with a chain extender containing polyamine. The isocyanate group-terminated prepolymer is obtained by reaction of at least a polyisocyanate containing 50 wt % or more of a non-multiple ring polyisocyanate that does not contain an aromatic ring and an aliphatic ring, or contains one aromatic ring or aliphatic ring; polyoxyethylene polyol; and a polyoxyethylene side chain-containing active compound having two or more hydroxyl groups or isocyanate groups at its molecular terminal and having a polyoxyethylene group in the side chain.

Aqueous polyurethane resin, hydrophilic resin, and film

An object of the present invention is to provide an aqueous polyurethane resin in which stable emulsion is formed, the balance between hydrophilicity and hydrophobicity is controlled and an obtained film has desired permeability and good stability, a method for producing the aqueous polyurethane resin, and a film obtained from the aqueous polyurethane resin. The aqueous polyurethane resin of the present invention includes a plurality of polyurethane resins obtained by reacting macropolyol, polyisocyanate, and a chain extender, and each of the aqueous polyurethane resins contains the macropolyols which are different from one another, and each of the aqueous polyurethane resins is chemically bonded partially to one another through the chain extender. By casting or coating the aqueous polyurethane resin, the film is obtained.

Aqueous polyurethane resin and method for producing aqueous polyurethane resin and film

The high-durability flexible polyurethane cold cure molded foam of the invention has an overall density of not less than 35 kg/m and not more than 45 kg/m and a wet heat compression set of not more than 15%, and preferably has a hardness change ratio, as determined in a repeated compression test, of not more than 15%. This foam can be obtained by the process of the invention. The process of the invention is a process for producing a flexible polyurethane cold cure molded foam obtained from a polyol and/or a polymer polyol containing dispersed polymer microparticles obtained by radical polymerizing a compound having an unsaturated bond in the polyol, water, a catalyst and a polyisocyanate, wherein the polyol is a polyol synthesized by the use of a catalyst containing at least one compound selected from the group consisting of a compound having a nitrogen-phosphorus double bond, cesium hydroxide and rubidium hydroxide. The foam of the invention has a low density and is excellent in durability, particularly in hardness change ratio in a repeated compression test and wet heat compression set. According to the process of the invention, such a foam can be obtained.

High-durability flexible polyurethane cold cure molded foam and process for producing the same

The object is to provide a method for producing a polyoxyalkylene polyol and a method for producing a derivative thereof wherein the remaining catalyst compound is efficiently removed from a crude polyoxyalkylene polyol by a simple manner, and a method for producing a polyoxyalkylene polyol wherein a crude polyoxyalkylene polyol is produced by addition polymerization of an epoxide compound to an active hydrogen compound using as a catalyst a compound having a P&boxH;N bond, then, the crude polyoxyalkylene polyol is allowed to contact with a solid acid having a specific surface area of 450 to 1200 m /g and an average pore diameter of 40 to 100 &angst; to control the catalyst-remaining amount in the polyoxyalkylene polyol to 150 ppm or less, and a method for producing a derivative of the-above-described polyol are provided.

Method for producing polyoxyalkylene polyol and derivatives thereof

A polymer dispersed polyol having a vinyl polymer dispersed in polyol, the vinyl polymer comprising containing 5 to 80 wt % of acrylamide compound (A) represented by the formula (1):

Polymer polyol and flame retardant polyurethane resin and foam prepared

A flexible polyurethane foam prepared by reacting polyisocyanate with polyol and/or polymer polyol containing dispersed polymer microparticles obtained by polymerizing an unsaturated compound, water, catalyst, surfactant and, when needed, crosslinking agent and other auxiliary agents, wherein a portion or the whole of the polyol and/or the polymer polyol is prepared in the presence of a compound having a nitrogen-phosphorus double bond as a catalyst, have excellent wet compression set, fatigue by constant-load pounding and dynamic durability.

Flexible polyurethane foam with high durability

Growing community of inventors

Kawasaki, Japan

Masahiro Isobe