Source: http://www.google.com/patents/US8167690?dq=5,941,947
Timestamp: 2015-07-30 04:27:30
Document Index: 645464914

Matched Legal Cases: ['Application No. 200780033122', 'Application No. 200910178369', 'Application No. 2006800259433', 'application No. 200780033122', 'Application No. 2006', 'Application No. 2006', 'Application No. 2006', 'Application No. 2007', 'Application No. 2007', 'application No. 2007', 'Application No. 2007', 'Application No. 10', 'Application No. 10', 'Application No. 096114785', 'Application No. 096114786', 'Application No. 096146036']

Patent US8167690 - Polishing pad - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA polishing pad of excellent durability has a polishing layer is arranged on a base material layer, and the polishing layer comprises a thermosetting polyurethane foam having roughly spherical interconnected cells with an average cell diameter of 35 to 300 μm....http://www.google.com/patents/US8167690?utm_source=gb-gplus-sharePatent US8167690 - Polishing padAdvanced Patent SearchPublication numberUS8167690 B2Publication typeGrantApplication numberUS 12/440,003PCT numberPCT/JP2007/058758Publication dateMay 1, 2012Filing dateApr 23, 2007Priority dateSep 8, 2006Also published asCN101511537A, CN101511537B, US20100029182, WO2008029538A1Publication number12440003, 440003, PCT/2007/58758, PCT/JP/2007/058758, PCT/JP/2007/58758, PCT/JP/7/058758, PCT/JP/7/58758, PCT/JP2007/058758, PCT/JP2007/58758, PCT/JP2007058758, PCT/JP200758758, PCT/JP7/058758, PCT/JP7/58758, PCT/JP7058758, PCT/JP758758, US 8167690 B2, US 8167690B2, US-B2-8167690, US8167690 B2, US8167690B2InventorsTakeshi Fukuda, Satoshi Maruyama, Junji Hirose, Kenji Nakamura, Masato DouraOriginal AssigneeToyo Tire & Rubber Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (89), Non-Patent Citations (28), Referenced by (9), Classifications (11), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetPolishing pad
US 8167690 B2Abstract
1. A polishing pad, comprising a polishing layer arranged on a base material layer,
the polishing layer comprising a thermosetting polyurethane foam having roughly spherical interconnected cells with an average cell diameter of 35 to 300 μm,
the thermosetting polyurethane foam comprising an isocyanate component and an active hydrogen-containing compound as raw material components, the active hydrogen-containing compound comprising 60 to 85% by weight of a high-molecular-weight polyol having a hydroxyl value of 20 to 100 mg KOH/g.
9. A method for manufacturing a substrate for a hard disk, which comprises polishing a surface of the substrate with the polishing pad of claim 4. Description
Patent Literature 1: JP-A 2003-37089 Patent Literature 2: JP-A 2003-100681 Patent Literature 3: JP-A 2004-291155 Patent Literature 4: JP-A 2004-335713 Patent Literature 5: JP-A 2006-75914 SUMMARY OF THE INVENTION
Post cure by heating the polyurethane foam, formed by applying the cell dispersed urethane composition onto the base material layer and then reacting the composition until it does not flow, has an effect of improving physical properties of the polyurethane foam and is thus extremely preferable. Post cure is carried out preferably at 40 to 70� C. for 10 to 60 minutes and conducted preferably at a normal pressure in order to stabilize the shape of cells.
The prepared polyurethane foam was sliced with a microtome cutter into measurement samples each with the thinnest possible thickness of 1 mm or less. A surface of a sample was photographed with a scanning electron microscope (manufactured by Hitachi Science System Co. with a model number of S-3500N) at a magnification of �200. An effective circular diameter of each of all cells in an arbitrary area was measured with an image analyzing soft (manufactured by MITANI Corp. with a trade name WIN-ROOF) and an average cell diameter was calculated from the measured values. In the case of an oval sphere-shaped cell, its cell diameter was expressed as the diameter of a circular cell equivalent in area to the oval sphere-shaped cell.
Determined according to JIS Z8807-1976. The prepared polyurethane foam cut out in the form of a strip of 4 cm�8.5 cm (thickness: arbitrary) was used as a sample for measurement of specific gravity and left for 16 hours in an environment of a temperature of 23�2� C. and a humidity of 50%�5%. Measurement was conducted by using a specific gravity hydrometer (manufactured by Sartorius Co., Ltd).
A hardness was measured in accordance with JIS K-7312. The prepared polyurethane foam was cut into samples with a size of 5 cm�5 cm (with arbitrary thickness), and the samples were left for 16 hours in an environment at a temperature of 23� C.�2� C. and humidity of 50%�5%. When measured, the samples were piled up to a thickness of 10 mm or more. A hardness meter (Asker C hardness meter, pressurized surface height 3 mm, manufactured by Kobunshi Keiki Co., Ltd.) was contacted with a pressurized surface, and 30 seconds later, the hardness was measured.
Glass plate: 6 inches φ, thickness 1.1 mm (optical glass, BK7) Slurry: Ceria slurry (Showa Denko GPL C1010) Slurry amount: 100 ml/min Polishing pressure: 10 kPa Number of revolutions of polishing platen: 55 rpm Number of revolutions of glass plate: 50 rpm Polishing time: 10 min/plate Number of glass plates polished: 500 First, the removal rate (Å/min) for each of polished glass plates is calculated. The calculation method is as follows: Removal rate=[amount of change [g] of glass plate before and after polishing/(glass plate density [g/cm3]�polished area [cm2] of glass plate�polishing time [min])]�108 A removal rate stability (%) is calculated by determining the maximum removal rate, minimum removal rate and average removal rate of from a first glass plate to a final treated glass plate (100 plates, 300 plates or 500 plates in total) and then substituting the above values in the following equation. A lower removal rate stability (%) is indicative of less change in removal rate even when a large number of glass plates are polished. In the present invention, it is preferable that the removal rate stability after treatment of 500 plates is within 10%. Removal rate stability (%)=[(maximum removal rate−minimum removal rate)/average removal rate of all glass plates]�100
The prepared cell dispersed urethane dispersion composition A was applied onto a base material layer (trade name: Pef, a polyethylene foam with a specific gravity of 0.18 and an Asker C hardness of 50, made by Toray) previously regulated by buffing to have a thickness of 0.8 mm, to prepare a cell dispersed urethane layer thereon. Then, the cell dispersed urethane layer was covered with a release sheet (polyethylene terephthalate, thickness 0.2 mm) previously subjected to release treatment. The cell dispersed urethane layer was regulated to be 1.0 mm in thickness with a nip roll and then cured at 70� C. for 40 minutes to form a polyurethane foam (average cell diameter, 70 μm; mean major axis/mean minor axis=1.3; specific gravity, 0.34; C hardness, 23 degrees). Thereafter, the release sheet on the polyurethane foam was released. Then, the surface of the polyurethane foam was buffed to a thickness of 0.8 mm by a buffing machine (manufactured by Amitec) to give a foam having regulated thickness accuracy. Thereafter, a double-sided tape (double tack tape manufactured by Sekisui Chemical Co., Ltd) was stuck by a laminator to the surface of the base material layer to prepare a polishing pad. FIG. 1 shows a photomicrograph of a cross section of the polishing pad. It can be seen that roughly spherical interconnected cells are formed in the polyurethane foam.
in treatment of 500
Removal rate stability (%)
plates in total (Å/min)
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS3049463Sep 9, 1959Aug 14, 1962Dennison Mfg CoDecorated foam and method of making the sameUS3284274Aug 13, 1962Nov 8, 1966Du PontCellular polymeric sheet material and method of making sameUS4216177May 16, 1979Aug 5, 1980Rogers CorporationPolyurethane foam product and process of manufacture thereof from thermosetting frothed mixtureUS5409770Mar 23, 1993Apr 25, 1995Shin-Etsu Handotai Co., Ltd.Elastic foamed sheet and wafer-polishing jig using the sheetUS5607982Jan 31, 1996Mar 4, 1997Basf CorporationFlexible open-cell polyurethane foamUS6099954Jun 8, 1999Aug 8, 2000Rodel Holdings, Inc.Polishing material and method of polishing a surfaceUS6107355Feb 13, 1996Aug 22, 2000Basf AktiengesellschaftProduction of polyurethane foamsUS6420448Jan 18, 2001Jul 16, 2002Foamex LpEnergy absorbing foamsUS6803495Jun 27, 2001Oct 12, 2004World Properties, Inc.Polyurethane foam composition and method of manufacture thereofUS7261625 *Feb 7, 2005Aug 28, 2007Inoac CorporationPolishing padUS7291063 *Jul 19, 2006Nov 6, 2007Ppg Industries Ohio, Inc.Polyurethane urea polishing padUS7762870 *Mar 2, 2006Jul 27, 2010Toyo Tire & Rubber Co., LtdPolishing pad and cushion layer for polishing padUS7927452 *Jul 7, 2006Apr 19, 2011Toyo Tire & Rubber Co., Ltd.Layered sheets and processes for producing the sameUS20030109209Jul 30, 2002Jun 12, 2003Rogers Inoac CorporationPolishing padUS20040024719Jul 31, 2002Feb 5, 2004Eytan AdarSystem and method for scoring messages within a system for harvesting community kowledgeUS20040142641Jan 6, 2004Jul 22, 2004Nihon Microcoating Co., Ltd.Polishing pad and methodUS20040166790Feb 21, 2003Aug 26, 2004Sudhakar BalijepalliMethod of manufacturing a fixed abrasive materialUS20050064709Oct 3, 2002Mar 24, 2005Tetsuo ShimomuraGrinding pad and method of producing the sameUS20050112354Mar 12, 2004May 26, 2005Fuji Spinning Co., Ltd.Polishing sheet and manufacturing method of elastic plastic foam sheetUS20050222288May 7, 2002Oct 6, 2005Hiroshi SeyanagiMethod of producing polishing pad-use polyurethane foam and polyurethane foamUS20060022368Nov 18, 2003Feb 2, 2006Kyu-Don LeeMethod of fabricating polyurethane foam with micro pores and polishing pad therefromUS20060280929Aug 24, 2006Dec 14, 2006Tetsuo ShimomuraPolishing pad and method of producing the sameUS20060280930Aug 24, 2006Dec 14, 2006Tetsuo ShimomuraPolishing pad and method of producing the sameUS20090011221Feb 10, 2006Jan 8, 2009Hiromasa KawaguchiCushioning Material for a Polishing PadUS20090093202Apr 19, 2007Apr 9, 2009Toyo Tire & Rubber Co., Ltd.Method for manufacturing polishing padUS20100003896Aug 17, 2007Jan 7, 2010Toyo Tire & Rubber Co., Ltd.Polishing padUS20100009611Apr 23, 2007Jan 14, 2010Toyo Tire & Rubber Co., Ltd.Method for manufacturing a polishing padUS20100029185 *Nov 27, 2007Feb 4, 2010Toyo Tire & Rubber Co., Ltd.Polishing pad and a method for manufacturing the sameUS20100317263Feb 26, 2009Dec 16, 2010Toyo Tire & Rubber Co., Ltd.Polishing padUS20110151240Jun 23, 2011Toyo Tire & Rubber Co., Ltd.Layered sheets and processes for producing the sameCN1407606AAug 23, 2002Apr 2, 2003株式会社罗捷士井上Grinding padCN1586002AOct 3, 2002Feb 23, 2005东洋纺织株式会社Grinding pad and method of producing the sameCN1625575AMay 7, 2002Jun 8, 2005东洋橡胶工业株式会社Manufacturing method of potishing pad use polyurethane foam and polyurethane foamJP3490431B2 Title not availableJP2000246620A Title not availableJP2001062703A Title not availableJP2002060452A Title not availableJP2002217149A Title not availableJP2002226608A Title not availableJP2002264912A Title not availableJP2002307293A Title not availableJP2002355754A Title not availableJP2003037089A Title not availableJP2003100681A Title not availableJP2003209079A Title not availableJP2003304951A Title not availableJP2004002788A Title not availableJP2004087647A Title not availableJP2004119657A Title not availableJP2004169038A Title not availableJP2004188716A Title not availableJP2004291155A Title not availableJP2004335713A Title not availableJP2004337992A Title not availableJP2005034971A Title not availableJP2005068175A Title not availableJP2005131720A Title not availableJP2005153053A Title not availableJP2005330621A Title not availableJP2006035367A Title not availableJP2006075914A Title not availableJP2006222349A Title not availableJP2006231429A Title not availableJP2006255828A Title not availableJP2006265303A Title not availableJP2006297515A Title not availableJP2006334745A Title not availableJP2006339570A Title not availableJP2006342191A Title not availableJP2006502300A Title not availableJP2006519115A Title not availableJP2007112032A Title not availableJP2007283712A Title not availableJP2007307700A Title not availableJP2008031034A Title not availableJP2008156519A Title not availableJPH0623664A Title not availableJPH02100321A Title not availableJPH04159084A Title not availableJPH04202215A Title not availableJPH05329852A Title not availableJPH06262633A Title not availableJPH11207758A Title not availableJPS6042431A Title not availableTW222390B Title not availableWO2001096434A1Jun 7, 2001Dec 20, 2001Toyo Tire & Rubber CoProcess for producing polyurethane foam, polyurethane foam, and abrasive sheetWO2005055693A2Nov 18, 2004Jun 23, 2005Freudenberg Nonwovens L PProcess and apparatus to continuously form a uniform sheet for use as a semiconductor polishing padWO2007123168A1Apr 19, 2007Nov 1, 2007Toyo Tire & Rubber CoProcess for producing polishing padWO2008026451A1Aug 16, 2007Mar 6, 2008Toyo Tire & Rubber CoPolishing pad* Cited by examinerNon-Patent CitationsReference1Chinese Decision on Rejection dated Apr. 15, 2011, directed to Chinese Application No. 200780033122.9; 16 pages.2Chinese Notification of First Office Action dated Dec. 19, 2011, directed to Chinese Application No. 200910178369.0; 21 pages.3Chinese Office Action mailed Dec. 18, 2009, directed to Chinese Patent Application No. 2006800259433; 11 pages.4CN Office Action dated Apr. 22, 2010 directed to application No. 200780033122.9; 13 pages.5Fukuda et al., U.S. Office Action mailed Nov. 8, 2011, directed to U.S. Appl. No. 12/439,992; 11 pages.6Fukuda, T. et al., U.S. Office Action mailed Nov. 16, 2011 directed to U.S. Appl. No. 12/519,339; 8 pages.7Hirose et al., U.S. Office Action mailed Sep. 26, 2011, directed to U.S. Appl. No. 13/038,849; 11 pages.8Hirose, J. et al., U.S. Office Action mailed Feb. 7, 2012, directed to U.S. Appl. No. 13/038,849; 11 pages.9Hirose, U.S. Office Action mailed May 4, 2010, directed to related U.S. Appl. No. 11/995,311; 9 pages.10International Search Report mailed Jun. 2, 2009, directed to International Patent Application No. PCT/JP2009/053481; 3 pages.11International Search Report mailed Jun. 5, 2007, directed to International Application No. PCT/JP2007/058757; 1 page.12International Search Report mailed Mar. 11, 2008, directed to International Application No. PCT/JP2007/072852; 4 pages.13International Search Report mailed on Jun. 5, 2007 directed at counterpart application No. PCT/JP2007/058758; 1 page.14International Search Report, mailed on Sep. 26, 2006, directed to International Patent Application No. PCT/JP2006/313597; 5 pages.15Japanese Notification of Reasons for Refusal mailed Apr. 8, 2011 directed towards Japanese Patent Application No. 2006-072873; 6 pages.16Japanese Notification of Reasons for Refusal mailed Apr. 8, 2011 directed towards Japanese Patent Application No. 2006-072945; 6 pages.17Japanese Notification of Reasons for Refusal mailed Apr. 8, 2011 directed towards Japanese Patent Application No. 2006-072957; 6 pages.18Japanese Notification of Reasons for Refusal mailed Feb. 2, 2012, directed to Japanese Application No. 2007-006224; 6 pages.19Japanese Notification of Reasons for Refusal mailed Jan. 10, 2012, directed to Japanese Application No. 2007-006229; 6 pages.20Japanese Notification of Reasons for Refusal mailed Jul. 22, 2010, directed at foreign application No. JP-2008-063034; 6 pages.21Japanese Office Action directed at counterpart application No. 2007-112032; 3 pages.22Japanese Office Action mailed Jan. 22, 2009, directed to Japanese Application No. 2007-227773; 3 pages.23Korean Notice to Submit a Response dated Mar. 30, 2011, directed to Korean Application No. 10-2009-7004682; 6 pages.24Korean Office Action dated Mar. 30, 2011, directed to corresponding Korean Application No. 10-2009-7004683; 7 pages.25Malaysian Substantive Examination Adverse Report dated Dec. 15, 2011 directed to Malaysian Patent Application No. PI 20080065; 3 pages.26Taiwanese Office Action dated Aug. 20, 2009, directed towards corresponding Taiwanese Application No. 096114785; 9 Pages.27Taiwanese Office Action issued Oct. 28, 2010, directed to Taiwanese Application No. 096114786; 6 pages.28Taiwanese Office Action mailed Sep. 7, 2011, directed to Taiwanese Application No. 096146036; 14 pages.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS8318298Mar 2, 2011Nov 27, 2012Toyo Tire & Rubber Co., Ltd.Layered sheets and processes for producing the sameUS8476328 *Feb 26, 2009Jul 2, 2013Toyo Tire & Rubber Co., LtdPolishing padUS8557376 *Sep 24, 2008Oct 15, 2013Fujibo Holdings Inc.Polishing padUS8602846Jul 18, 2012Dec 10, 2013Toyo Tire & Rubber Co., Ltd.Polishing pad and a method for manufacturing the sameUS9011212 *Apr 16, 2012Apr 21, 2015Fujibo Holdings, Inc.Polishing pad and manufacturing method thereforUS20100210197 *Sep 24, 2008Aug 19, 2010Fujibo Holdings Inc.Polishing padUS20100317263 *Feb 26, 2009Dec 16, 2010Toyo Tire & Rubber Co., Ltd.Polishing padUS20110269380 *Aug 13, 2010Nov 3, 2011Iv Technologies Co., Ltd.Base layer, polishing pad including the same and polishing methodUS20140106652 *Apr 16, 2012Apr 17, 2014Fujibo Holdings Inc.Polishing pad and manufacturing method therefor* Cited by examinerClassifications U.S. Classification451/533, 451/530, 451/528International ClassificationB24D11/00, B24B37/22, B24B37/24, H01L21/304Cooperative ClassificationB24D3/26, B24B37/24European ClassificationB24B37/24, B24D3/26Legal EventsDateCodeEventDescriptionMar 9, 2009ASAssignmentOwner name: TOYO TIRE & RUBBER CO., LTD.,JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FUKUDA, TAKESHI;MARUYAMA, SATOSHI;HIROSE, JUNJI;AND OTHERS;REEL/FRAME:022363/0607Effective date: 20090205Owner name: TOYO TIRE & RUBBER CO., LTD., JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FUKUDA, TAKESHI;MARUYAMA, SATOSHI;HIROSE, JUNJI;AND OTHERS;REEL/FRAME:022363/0607Effective date: 20090205RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services