Patent ID: 6949589
Filing Date: 2005-09-27
Classification: B24D,C08G

Abstract:
1. A polyurea elastic foamed grinder material for grinding and/or buffing, prepared by subjecting a composition comprising: a main ingredient component (A) including a polyisocyanate (A-1), and a component (B) including an aromatic diamine (B-1), a foaming agent (B-2), a foam stabilizing surfactant (B-3), and a curing catalyst (B-4), to foaming and curing in the presence of grinder granules (C), wherein said aromatic diamine (B-1) is an aromatic diamine oligomer (B-1-1) alone or a mixture of the aromatic diamine oligomer (B-1-1) and an aromatic diamine compound (B-1-2); wherein a ratio of the content of said aromatic diamine compound (B-1-2) in the aromatic diamine (B-1) is 50% by mass or less; wherein said main ingredient component (A) and said component (B) are contained in amounts in terms of a molar ratio of isocyanate groups in the isocyanate (A-1) as the main ingredient component (A) to amino groups in the aromatic diamine (B-1) in the component (B) (NCO/NH wherein the foaming agent (B-2) is in an amount more than 0% by mass to 30% by mass or less in the component (B); wherein the foam stabilizing surfactant (B-3) is in an amount more than 0% by mass to 6% by mass or less in the component (B); wherein the curing catalyst (B-4) is in an amount more than 0% by mass to 5% by mass or less in the component (B); and wherein an amount of said grinder granules (C) is 20 to 70% by mass of a total amount of the main ingredient component (A), the grinder granules (C) and the component (B) with the exception of the foaming agent (B-2).