Methods for making urethane molded products for polishing pads
First Claim
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1. A method for making urethane molded products for polishing pads, which method comprises the steps ofproviding a mixture of expanded microballoons (A1), an isocyanate-terminated urethane prepolymer (B), and an active hydrogen-containing compound (C), wherein said expanded microballoons (A1) are present in an amount of 0.1 to 10 parts per 100 parts by weight, in total, of said isocyanate-terminated urethane prepolymer (B) and said active hydrogen-containing compound (C), mixing water (D) in an amount of 0.02 to 0.05 wt % with said mixture, and forming cells derived from said water (D) in the molded products.
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Abstract
Urethane molded products for polishing pad comprise two types of cells having different sizes in urethane molded products formed by mixing and curing an isocyanate-terminated urethane prepolymer and an active hydrogen-containing compound. The molded products may be made by a procedure comprising mixing expanded microballoons or non-expanded, thermally expandable microspheres and water with the isocyanate-terminated urethane prepolymer and active hydrogen-containing compound and curing the mixture.
48 Citations
8 Claims
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1. A method for making urethane molded products for polishing pads, which method comprises the steps of
providing a mixture of expanded microballoons (A1), an isocyanate-terminated urethane prepolymer (B), and an active hydrogen-containing compound (C), wherein said expanded microballoons (A1) are present in an amount of 0.1 to 10 parts per 100 parts by weight, in total, of said isocyanate-terminated urethane prepolymer (B) and said active hydrogen-containing compound (C), mixing water (D) in an amount of 0.02 to 0.05 wt % with said mixture, and forming cells derived from said water (D) in the molded products.
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4. A method for making urethane molded products for polishing pads, comprising the steps of:
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pre-mixing expanded microballoons (A1) with an isocyanate-terminated urethane prepolymer (B) and/or an active hydrogen-containing compound (C), mixing water (D) with a mixture of expanded microballoons (A1), an isocyanate-terminated urethane prepolymer (B), and an active hydrogen-containing compound (C) under agitation in an amount of 0.02 to 0.05 wt % based on the mixture, reacting an isocyanate-terminated urethane prepolymer (B) and an active hydrogen-containing compound (C) to produce urethane polymer and vaporizing water (D) by reaction heat, subjecting the reaction mixture to primary curing at a temperature in the range 90 to 120°
C., andsubjecting the reaction mixture to secondary curing at a temperature in the range 90 to 120°
C., to produce urethane molded products including two types of cells having different sizes formed on the basis of the expanded microballoons (A1) and the water (D).
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5. A method for making urethane molded products for polishing pads, which method comprises the steps of
providing a mixture of non-expanded, thermally expandable microspheres (A2), an isocyanate-terminated urethane prepolymer (B), and an active hydrogen-containing compound (C), wherein said non-expanded thermally expandable microspheres (A2) are present in an amount of 0.1 to 10 parts per 100 parts by weight, in total, of said isocyanate-terminated urethane prepolymer (B) and said active hydrogen-containing compound (C), mixing water (D) in an amount of 0.02 to 0.05 wt % with said mixture, and forming cells by expanding said non-expanded, thermally expandable microspheres (A2) and cells derived from said water (D) by application of heat of reaction and also of heat from outside.
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8. A method for making urethane molded products for polishing pads, comprising the steps of:
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pre-mixing non-expanded thermally expandable microspheres (A2) with an isocyanate-terminated urethane prepolymer (B) and/or an active hydrogen-containing compound (C), mixing water (D) with a mixture of non-expanded thermally expandable microspheres (A2), an isocyanate-terminated urethane prepolymer (B), and an active hydrogen-containing compound (C) under agitation in an amount of 0.02 to 0.05 wt % based on the mixture, reacting an isocyanate-terminated urethane prepolymer (B) and an active hydrogen-containing compound (C) to produce urethane polymer, expanding the non-expanded thermally expandable microspheres (A2) and vaporizing water (D) by reaction heat, subjecting the reaction mixture to primary curing at a temperature in the range 90 to 120°
C., andsubjecting the reaction mixture to secondary curing at a temperature in the range 90 to 120°
C., to produce urethane molded products including two types of cells having different sizes formed on the basis of the non-expanded thermally expandable microspheres (A2) and the water (D).
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Specification
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Current AssigneeFuji Spinning Company Limited
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Original AssigneeFuji Spinning Company Limited
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InventorsMochizuki, Yoshimi, Kihara, Katushi
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Primary Examiner(s)COONEY, JOHN M
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Application NumberUS09/384,554Time in Patent Office1,495 DaysField of Search428/313.5, 428/317.9, 521/130, 521/137, 521/155, 521/159, 521/163, 521/170US Class Current521/159CPC Class CodesC08G 18/12 using two or more compounds...C08G 18/3814 PolyaminesC08G 18/3868 the sulfur atom belonging t...C08G 18/4854 Polyethers containing oxyal...C08G 18/6674 with compounds of group C08...C08G 18/6685 with compounds of group C08...C08J 2203/22 Expandable microspheres, e....C08J 2375/04 PolyurethanesC08J 9/32 from compositions containin...Y10T 428/249972 Resin or rubber elementY10T 428/249986 Void-containing component c...
