Mitsui Chemicals, Inc.

Hisashi Kawanabe

Satoshi Yamasaki

Kenichi Suzuki

Shigeyuki Motomura

Daisuke Nishiguchi

Hiroaki Sakaguchi

Takashi Abe

Kazuto Usaka

A fiber mixture according to the invention comprises fibers A comprising a polymer A containing a thermoplastic polyurethane elastomer and fibers B comprising a thermoplastic polymer B other than the thermoplastic polyurethane elastomer, said thermoplastic polyurethane elastomer having a starting temperature for solidifying of 65&#xb0; C. or above as measured by a differential scanning calorimeter (DSC) and containing 3.00&#xd7;10or less polar-solvent-insoluble particles per g counted on a particle size distribution analyzer, which is based on an electrical sensing zone method, equipped with an aperture tube having an orifice of 100 &#x3bc;m in diameter. An elastic nonwoven fabric comprises the fiber mixture.

Mixed fiber and stretch nonwoven fabric comprising said mixed fiber and method for manufacture thereof

A spunbonded elastic nonwoven fabric according to the invention comprises fibers formed from a polymer comprising a thermoplastic polyurethane elastomer, wherein the thermoplastic polyurethane elastomer has a starting temperature for solidifying of 65&#xb0; C. or above as measured by a differential scanning calorimeter (DSC) and contains 3.00&#xd7;10or less polar-solvent-insoluble particles per g as counted on a particle size distribution analyzer, which is based on an electrical sensing zone method, equipped with an aperture tube having an orifice of 100 &#x3bc;m in diameter, and wherein the fibers have diameters such that the standard deviation of fiber diameters (Sn) divided by the average fiber diameter (X) (Sn/X) gives a value of 0.15 or less.

Stretch nonwoven fabric and method for production thereof

The two-component type polyurethane composition according to the present invention is obtained from a principal component containing a compound having an isocyanate group and a curing agent containing a compound having active hydrogen, and is characterized in that both the principal component and the curing agent contain substantially no thixotropic agent, the mixture of the principal component and the curing agent has a specific thixotropy-developing time and a specific slump, the active hydrogen compound has a specific flash point, and that the mass change of the two-component type polyurethane composition before/after boiling in boiling water under specific conditions is in a specific range. The two-component type polyurethane composition according to the present invention develops excellent thixotropy immediately after mixing the principal component and the curing agent, thereby enables its application under a variety of conditions such as mechanical-application and hand-application, and has excellent sag resistance and other physical properties suitable for sealing materials.

Two-component type polyurethane composition and process of preparing the same

Growing community of inventors

Sodegaura, Japan

Hisashi Kawanabe