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公开(公告)号：US20210309794A1
公开(公告)日：2021-10-07
申请号：US17262060
申请日：2019-07-19
申请人： KURARAY CO., LTD.
摘要： There is used a polyurethane for polishing layers that can be used as a material of a polishing layer of a polishing pad, the polyurethane including a thermoplastic polyurethane that is a reaction product of a polyurethane raw material including a polymer diol, an organic diisocyanate, and a chain extender, wherein the chain extender contains 50 mass % or more of a first chain extender including a straight-chain carbon backbone having 7 to 12 carbon atoms.
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公开(公告)号：US20170334034A1
公开(公告)日：2017-11-23
申请号：US15524339
申请日：2015-11-12
申请人： KURARAY CO., LTD.
CPC分类号： B24B37/24 , B24B37/26 , H01L21/304
摘要： Disclosed is a polishing-layer molded body including: a thermoplastic polyurethane that is a polymer of a monomer including: a polymer diol; an organic diisocyanate; a first chain extender including a diol having 4 or less carbon atoms; a second chain extender including a diol having 5 or more carbon atoms, a content ratio of nitrogen derived from an isocyanate group of the organic diisocyanate being 6.3 to 7.4 mass %, and the polishing-layer molded body being non-porous.
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公开(公告)号：US20170291275A1
公开(公告)日：2017-10-12
申请号：US15516607
申请日：2015-10-27
申请人： KURARAY CO., LTD
CPC分类号： B24B37/24 , B24B37/22 , B24D3/28 , C08G18/0895 , C08G18/3203 , C08G18/6607 , C08J2375/04 , H01L21/304
摘要： Disclosed is a non-porous molded article for a polishing layer, the non-porous molded article including a thermoplastic polyurethane, wherein the thermoplastic polyurethane has a maximum value of a loss tangent (tan 5) in a range of −70 to −50° C. of 4.00×10−2 or less. Preferably, the thermoplastic polyurethane is obtained by polymerization of a polymer diol having a number average molecular weight of 650 to 1400, an organic diisocyanate, and a chain extender, and a content ratio of nitrogen derived from an isocyanate group of the organic diisocyanate is 5.7 to 6.5 mass %.
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