Kuraray Co., Ltd.

Nobuo Takaoka

Kimio Nakayama

Mitsuru Kato

Jiro Tanaka

Tsuyoshi Yamasaki

Shuhei Yorimitsu

Hirofumi Kikuchi

Rei Nagayama

Masasi Meguro

Koichi Hayashi

It is an object of the present invention to provide a polishing pad that is resistant to scratching and also has excellent flattening performance. One aspect of the present invention is a polishing pad, comprising a fiber-entangled body formed from fiber bundles made up of ultrafine fibers in which the average cross sectional area is between 0.01 and 30 &#x3bc;m, and a macromolecular elastomer, wherein part of the macromolecular elastomer is present inside the fiber bundles, whereby the ultrafine fibers are bundled, the number of fiber bundles per unit of surface area present in a cross section in the thickness direction is at least 600 bundles per square millimeter, and the volumetric ratio of a portion excluding voids is between 55 and 95%.

Polishing pad, and method for manufacturing polishing pad

A leather-like sheet composed of a microfine-fiber entangled body made of bundles of microfine fibers and an elastic polymer impregnated therein. The bundles of microfine fibers are composed of microfine monofibers having an average cross-sectional area of 0.1 to 30 &#x3bc;mand have an average cross-sectional area of 40 to 400 &#x3bc;m. The bundles of microfine fibers exist in a density of 600 to 4000/mmon a cross section taken along the thickness direction of the microfine-fiber entangled body. The elastic polymer contains 30 to 100% by mass of a polymer of ethylenically unsaturated monomer. The polymer of ethylenically unsaturated monomer is composed of a soft component having a glass transition temperature (Tg) of less than &#x2212;5&#xb0; C., a crosslinkable component, and optionally a hard component having a glass transition temperature (Tg) of higher than 50&#xb0; C. and another component. The polymer of ethylenically unsaturated monomer is bonded to the microfine fibers in the bundles of microfine fibers. The leather-like sheet has a flexibility and hand such as dense feeling each resembling natural leathers and a high quality appearance. The leather-like sheet is highly stable in quality such as fastness and surface abrasion resistance and excellent in practical performance.

Leather-like sheet and method of manufacturing the same

The suede artificial leather of the present invention comprises a three-dimensional entangled body comprising a superfine fiber having a fineness of 0.2 dtex or less and an elastomeric polymer A, and satisfies the requirements (1) to (4) as specified in the specification. By meeting the requirements, the suede artificial leather acquires excellent color fastness to light and color development in a wide range of colors and a high quality with good suede feeling, surface touch, hand, mechanical properties and color fastness.

Suede artificial leather and production method thereof

Provided are a leather-like sheet fabricated by infiltrating an aqueous resin dispersion (A) into a fibrous substrate, which satisfies a requirement (I) that the aqueous resin dispersion, (A) comprises essentially a main resin (a) stabilized with a surfactant, a polymer (b) having a polyoxyethylene group in its side chains, and a surfactant (c), a requirement (II) that the main resin (a) comprises an urethane resin (a1) and/or an urethane-acrylic composite resin (a2), and the resin skeleton contains from 1 to 10 mmols of a carboxyl group per 100 g of the resin, a requirement (III) that the polymer (b) is obtained through polymerization of a polyoxyethylene group-having ethylenic unsaturated monomer (b1) and any other ethylenic unsaturated monomer (b2) in a ratio by mass (b1)/(b2)=60/40 to 100/0, and a requirement (IV) that the percentage, % by mass (&#x3b1;) of the polyoxyethylene group in the polymer (b) and the number of mols (&#x3b2;) of the amino group per gram of the polymer (b) satisfy 35&#x2266;&#x3b1;+&#x3b2;&#xd7;20000&#x2266;60; and an industrial advantageous method for producing the sheet. The leather-like sheet has a good feel and good physical properties.

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Okayama, Japan

Nobuo Takaoka