Source: http://www.google.com/patents/US7241408?dq=7,003,515
Timestamp: 2016-02-14 15:52:59
Document Index: 486800966

Matched Legal Cases: ['Application No. 91117406', 'Application No. 91117406', 'Application No. 91117406', 'art 110', 'art 110', 'art 210', 'art 210']

Patent US7241408 - Method of fabricating polishing pad having detection window thereon - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsThe present invention provides a method of fabricating a polishing pad having a detection window thereon. A mold having a cavity therein and a transparent thermosetting plastic part that is incompletely hardened are provided. The transparent thermosetting plastic part is disposed in the mold and a high...http://www.google.com/patents/US7241408?utm_source=gb-gplus-sharePatent US7241408 - Method of fabricating polishing pad having detection window thereonAdvanced Patent SearchPublication numberUS7241408 B2Publication typeGrantApplication numberUS 11/411,077Publication dateJul 10, 2007Filing dateApr 24, 2006Priority dateNov 19, 2002Fee statusPaidAlso published asUS7875335, US20040094855, US20060197249, US20060198992Publication number11411077, 411077, US 7241408 B2, US 7241408B2, US-B2-7241408, US7241408 B2, US7241408B2InventorsWen-Chang Shih, Yung-Chung Chang, Min-Kuei Chu, Lung-Chen WeiOriginal AssigneeI.V. Technologies Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (6), Referenced by (14), Classifications (23), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetMethod of fabricating polishing pad having detection window thereon
US 7241408 B2Abstract
The present invention provides a method of fabricating a polishing pad having a detection window thereon. A mold having a cavity therein and a transparent thermosetting plastic part that is incompletely hardened are provided. The transparent thermosetting plastic part is disposed in the mold and a high molecular weight foam is injected into the cavity of the mold. The transparent thermosetting plastic part and the high molecular weight foam are hardened at the same time. After the step of demolding is performed, a polishing pad having a detection window thereon is formed. Moreover, the transparent thermosetting plastic part can be designed to have the central portion thicker than its peripheral portion for preventing deformation that is caused by the material difference of the detection window and other portions of the polishing pad.
1. A method of fabricating a polishing pad having a detection window thereon, comprising:
providing a transparent thermosetting plastic part and a mold with a cavity, wherein the transparent thermosetting plastic part is not completely hardened and the profile of a side surface of the transparent thermosetting plastic part is an uneven surface selected from a group consisting of a serrated shape, a wavy shape and a toothed shape;
placing the transparent thermosetting plastic part into the cavity of the mold;
injecting a high molecular weight foam into the cavity of the mold, wherein the high molecular weight foam and the transparent thermosetting plastic part become completely hardened at the same time; and
performing demolding to remove the mold, so as to obtain the polishing pad with the detection window.
2. The method of claim 1, wherein a material of the transparent thermosetting plastic part is selected from the following group consisting of a fully transparent high molecular weight material and a semi-transparent high molecular weight material.
3. The method of claim 1, wherein a material of the transparent thermosetting plastic part is selected from the following group consisting of acrylic resin (PMMA), polyurethane (PU), polyvinyl chloride (PVC), epoxy resin and unsaturated polyester (UP).
4. The method of claim 1, wherein the transparent thermosetting plastic part has a hardness ranging from 70 Shore A to 75 Shore D.
5. The method of claim 1, wherein the transparent thermosetting plastic part has a central portion thicker than a peripheral portion.
6. The method of claim 1, wherein the high molecular weight foam comprises a polyurethane foam.
7. The method of claim 1, wherein the transparent thermosetting plastic part has a shape selected from the following group consisting of round, elliptical and tetragonal.
8. The method of claim 1, wherein the polishing pad has an attrition rate equivalent to that of the detection window.
9. The method of claim 1, wherein a side surface of the transparent thermosetting plastic part is coated with a thermal adhesive.
10. A method of fabricating a polishing pad having a detection window thereon, comprising:
injecting a high molecular weight foam into the cavity of the mold;
forming a high molecular weight material layer on the high molecular weight foam in the cavity of the mold, wherein the high molecular weight foam, the high molecular weight material layer and the transparent thermosetting plastic part become completely hardened at the same time; and
11. The method of claim 10, wherein a material of the transparent thermosetting plastic part is selected from the following group consisting of a fully transparent high molecular weight material and a semi-transparent high molecular weight material.
12. The method of claim 10, wherein a material of the transparent thermosetting plastic part is selected from the following group consisting of acrylic resin (PMMA), polyurethane (PU), polyvinyl chloride (PVC), epoxy resin and unsaturated polyester (UP).
13. The method of claim 10, wherein the transparent thermosetting plastic part has a hardness ranging from 70 Shore A to 75 Shore D.
14. The method of claim 10, wherein the transparent thermosetting plastic part has a central portion thicker than a peripheral portion.
15. The method of claim 10, wherein the high molecular weight foam comprises a polyurethane foam.
16. The method of claim 10, wherein a material of the high molecular weight material layer is selected from the following group consisting of polyurethane (PU), silicon rubber, polybutyl rubber (PBR), polyvinyl chloride (PVC) latex and polyacrylic acid series (PMMA) latex.
17. The method of claim 10, wherein the transparent thermosetting plastic part has a shape selected from the following group consisting of round, elliptical and tetragonal.
18. The method of claim 10, wherein the high molecular weight foam has a hardness larger than that of the high molecular weight material layer.
19. The method of claim 18, wherein the hardness of the high molecular weight foam ranges from 30 Shore D to 80 Shore D.
20. The method of claim 18, wherein the high molecular weight material layer has a hardness ranging from 5 Shore A to 60 Shore A.
21. The method of claim 10, wherein the polishing pad has an attrition rate equivalent to that of the detection window.
22. The method of claim 10, wherein a side surface of the transparent thermosetting plastic part is coated with a thermal adhesive.
23. A method of fabricating a polishing pad having a detection window thereon, comprising:
providing a transparent thermosetting plastic part and a mold with a cavity, wherein the transparent thermosetting plastic part is not completely hardened;
placing the transparent thermosetting plastic part into the cavity of the mold, wherein a side surface of the transparent thermosetting plastic part is coated with a thermal adhesive;
injecting a high molecular weight foam into the cavity of the mold, wherein the thermal adhesive has chemical reactions with the high molecular weight foam, and wherein the thermal adhesive, the high molecular weight foam and the transparent thermosetting plastic part become completely hardened at the same time; and
24. The method of claim 23, wherein a material of the transparent thermosetting plastic part is selected from the following group consisting of a fully transparent high molecular weight material and a semi-transparent high molecular weight material.
25. The method of claim 23, wherein a material of the transparent thermosetting plastic part is selected from the following group consisting of acrylic resin (PMMA), polyurethane (PU), polyvinyl chloride (PVC), epoxy resin and unsaturated polyester (UP).
26. The method of claim 23, wherein the transparent thermosetting plastic part has a hardness ranging from 70 Shore A to 75 Shore D.
27. The method of claim 23, wherein the transparent thermosetting plastic part has a central portion thicker than a peripheral portion.
28. The method of claim 23, wherein the high molecular weight foam comprises a polyurethane foam.
29. The method of claim 23, wherein the transparent thermosetting plastic part has a shape selected from the following group consisting of round, elliptical and tetragonal.
30. The method of claim 23, wherein the side surface of the transparent thermosetting plastic part is an uneven surface.
31. The method of claim 30, wherein the side surface of the transparent thermosetting plastic part is configured to have a shape selected from the following group consisting of a serrated shape, a wavy shape and a toothed shape.
32. The method of claim 23, wherein the polishing pad has an attrition rate equivalent to that of the detection window.
This application is a continuation of application Ser. No. 10/438,663 filed on May 14, 2003, now allowed and abandoned, which claims the priority benefit of Taiwan application serial No. 91133681, filed on Nov. 19, 2002.
The present invention provides a method of fabricating the polishing pad having a detection window, which can improve the prior problems, such as distortion or warp, of the transparent window.
The present invention provides a method of fabricating the polishing pad having a detection window, for improving the slurry leakage problems resulting from in-complete contact between the polishing pad and the transparent window.
The present invention provides a method of fabricating the polishing pad having a detection window, which increases the polishing uniformity of the polishing pad having a detection window.
As embodied and broadly described herein, the present invention provides a mold having a cavity and a transparent thermosetting plastic part. The transparent thermosetting plastic part is not completely hardened. The parent thermosetting plastic part is made of a fully transparent high molecular weight material or a semi-transparent high molecular weight material, for example. The transparent thermosetting plastic part can be designed to be round, elliptical, tetragonal or in any other suitable shapes, from the top view. The side surface of the transparent thermosetting plastic part is designed to be an uneven and rugged surface. The transparent thermosetting plastic part is placed inside the cavity of the mold and a high molecular weight foam is injected into the cavity of the mold. The transparent thermosetting plastic part and the high molecular weight foam become completely hard (hardened) at the same time. The high molecular weight foam is, for example, a PU foam. The manufacturing method of the PU foam and related parameters have been disclosed in the Taiwanese Application No. 91117406 under the same inventors. After demolding, the polishing pad having the detection window is obtained. There is a uniform attrition (polishing) rate toward either the polishing pad or the detection window.
As embodied and broadly described herein, the present invention provides a mold having a cavity and a transparent thermosetting plastic part. The transparent thermosetting plastic part is not completely hardened. The parent thermosetting plastic part is made of a fully transparent high molecular weight material or a semi-transparent high molecular weight material, for example. The transparent thermosetting plastic part can be designed to be round, elliptical, tetragonal or in any other suitable shapes, from the top view. The side surface of the transparent thermosetting plastic part is designed to be an uneven and rugged surface. The transparent thermosetting plastic part is placed inside the cavity of the mold and a high molecular weight foam is injected into the cavity of the mold. The high molecular weight foam is hardened for a short period. The high molecular weight foam is, for example, a PU foam. The manufacturing method of the PU foam and related parameters have been disclosed in the Taiwanese Application No. 91117406 under the same inventors. Afterwards, a high molecular weight material layer is injected into the cavity and on the high molecular weight foam in the mold. The transparent thermosetting plastic part, the high molecular weight foam and the high molecular weight material layer become completely hardened (hard) at the same time. The high molecular weight material layer is made of, for example, polyurethane (PU), silicon rubber, polybutyl rubber (PBR), polyvinyl chloride (PVC) latex or polyacrylic acid series (PMMA) latex. In this embodiment, the high molecular weight foam has a hardness larger (higher) than that of the high molecular weight material layer, so that the high molecular weight material layer is used as a buffer layer. After demolding, the polishing pad having the detection window is obtained. There is a uniform attrition (polishing) rate toward either the polishing pad or the detection window.
As embodied and broadly described herein, the present invention provides a mold having a cavity and a transparent thermosetting plastic part. The transparent thermosetting plastic part is not completely hardened. The parent thermosetting plastic part is made of a fully transparent high molecular weight material or a semi-transparent high molecular weight material, for example. The transparent thermosetting plastic part can be designed to be round, elliptical, tetragonal or in any other suitable shapes, from the top view. The side surface of the transparent thermosetting plastic part is designed to be an uneven and rugged surface. The transparent thermosetting plastic part is placed inside the cavity of the mold and an incomplete reactive material is coated to the side surface of the thermosetting plastic part. The incomplete reactive material is a thermal adhesive, for example. A high molecular weight foam is injected into the cavity of the mold. The incomplete reactive material has a chemical reaction with the high molecular weight foam, so that the incomplete reactive material, the high molecular weight foam and the transparent thermosetting plastic part become hardened at the same time. The high molecular weight foam is, for example, a PU foam. The manufacturing method of the PU foam and related parameters have been disclosed in Taiwanese Application No. 91117406 under the same inventors. After demolding, the polishing pad having the detection window is obtained. There is a uniform attrition (polishing) rate toward either the polishing pad or the detection window.
In addition, the transparent thermosetting plastic part 110 can be designed to be round, elliptical, tetragonal or in any other suitable shapes, from the top view. Preferably, the transparent thermosetting plastic part 110 is in an ellipsoid shape, from the top view.
In addition, the transparent thermosetting plastic part 210 can be designed to be round, elliptical, tetragonal or in any other suitable shape, from the top view. Preferably, the transparent thermosetting plastic part 210 is in an ellipsoid shape, from the top view.
1. Since the transparent thermosetting plastic part and the high molecular weight foam become hardened at the same time, the method of the present invention can lessen the distortion or deformation of the transparent thermosetting plastic part and the high molecular weight foam resulting from hardening at different time points. The method of the present invention for manufacturing the polishing pad having the detection window can increase planarity of the polishing pad. 2. The method of the present invention for manufacturing the polishing pad having the detection window further comprises coating an incomplete reactive material on the transparent thermosetting plastic part, in order to enhance adhesion of the transparent thermosetting plastic part and the polishing pad, so that the slurry will not leak from the cleavage between the transparent thermosetting plastic part and the polishing pad. 3. In the manufacturing method of the present invention, the side surface of the transparent thermosetting plastic part is designed to be uneven and rugged. Since the side surface of the transparent thermosetting plastic part is uneven, the total contact area between the transparent thermosetting plastic part and the high molecular weight foam is increased and the adhesion between the two is strengthened. The shape of the transparent thermosetting plastic part is adjustable. It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS5605760Aug 21, 1995Feb 25, 1997Rodel, Inc.Polishing padsUS5893796Aug 16, 1996Apr 13, 1999Applied Materials, Inc.Forming a transparent window in a polishing pad for a chemical mechanical polishing apparatusUS6696005May 13, 2002Feb 24, 2004StrasbaughMethod for making a polishing pad with built-in optical sensorUS6832950Oct 28, 2002Dec 21, 2004Applied Materials, Inc.Polishing pad with windowUS6875077Mar 17, 2003Apr 5, 2005Raytech Innovative Solutions, Inc.Polishing pad for use in chemical/mechanical planarization of semiconductor wafers having a transparent window for end-point determination and method of makingUS20010036805May 22, 2001Nov 1, 2001Applied Materials, Inc., A Delaware CorporationForming a transparent window in a polishing pad for a chemical mehcanical polishing apparatusReferenced byCiting PatentFiling datePublication dateApplicantTitleUS7629554Mar 19, 2007Dec 8, 2009San Fang Chemical Industry Co., Ltd.Sheet for mounting polishing workpiece and method for making the sameUS7789738Jul 3, 2006Sep 7, 2010San Fang Chemical Industry Co., Ltd.Sheet for mounting polishing workpiece and method for making the sameUS7875335 *Apr 24, 2006Jan 25, 2011Iv Technologies Co., Ltd.Method of fabricating polishing pad having detection window thereonUS9017140Jan 13, 2010Apr 28, 2015Nexplanar CorporationCMP pad with local area transparencyUS9028302Dec 6, 2013May 12, 2015Nexplanar CorporationPolishing pad for eddy current end-point detectionUS9156124Jul 8, 2010Oct 13, 2015Nexplanar CorporationSoft polishing pad for polishing a semiconductor substrateUS20060198992 *Apr 24, 2006Sep 7, 2006Wen-Chang ShihMethod of fabricating polishing pad having detection window thereonUS20080003927 *May 7, 2007Jan 3, 2008Chung-Chih FengSheet for mounting polishing workpiece and method for making the sameUS20080003932 *Jul 3, 2006Jan 3, 2008Chung-Chih FengSheet for mounting polishing workpiece and method for making the sameUS20080003933 *Jul 3, 2006Jan 3, 2008Chung-Chih FengSheet for mounting polishing workpiece and method for making the sameUS20080003934 *Mar 19, 2007Jan 3, 2008Chung-Chih FengSheet for mounting polishing workpiece and method for making the sameUS20080064310 *Sep 8, 2006Mar 13, 2008Chung-Chih FengPolishing pad having hollow fibers and the method for making the sameUS20090252876 *Jun 10, 2009Oct 8, 2009San Fang Chemical Industry Co., Ltd.Sheet for mounting polishing workpiece and method for making the sameUS20090305610 *Dec 10, 2009Applied Materials, Inc.Multiple window pad assembly* Cited by examinerClassifications U.S. Classification264/46.4, 264/271.1International ClassificationB29C45/14, B29C44/12Cooperative ClassificationY10T428/249953, Y10T428/31, B29C44/1271, B32B2266/0278, B32B3/263, B32B27/065, B32B2432/00, B24B37/205, B32B2307/412, B32B27/08, Y10T428/24355, B32B25/045, Y10T428/24628European ClassificationB24B37/20F, B32B27/06F, B32B3/26A, B32B27/08, B32B25/04F, B29C44/12MLegal EventsDateCodeEventDescriptionFeb 14, 2011REMIMaintenance fee reminder mailedApr 6, 2011FPAYFee paymentYear of fee payment: 4Apr 6, 2011SULPSurcharge for late paymentJan 12, 2015FPAYFee paymentYear of fee payment: 8RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services