The present invention provides an abrasive pad for abrading a surface to be abraded in the presence of an abrasive solution, which includes a hydrophobic polymer as a base material, and in which a graft-polymer chain having a hydrophilic group is introduced into the surface of the hydrophobic polymer. The hydrophilic group possessed by the graft-polymer chain is preferably a nonionic hydrophilic group selected from the group consisting of hydrophilic groups having an N-monoalkyl substituted structure and hydrophilic groups having an N-dialkyl substituted amide group. An amount of the hydrophilic graft-polymer to be introduced into the base material is preferably 10.0% to 150.0% in terms of graft ratio.
1. An abrasive pad for abrading a surface to be abraded in the presence of an abrasive solution, the abrasive pad comprising (a) a base material comprised of a hydrophobic polymer and (b) a graft-polymer chain, wherein the polymer chain has a hydrophilic group and is directly bound to a principal polymer constituting the hydrophobic base material only at one terminal of the polymer chain and the surface of the base material has a continuous hydrophilic region over the entire surface owing to a free terminal of the graft-polymer chain.
2. The abrasive pad according to claim 1 , wherein the hydrophilic group of the graft-polymer chain is a nonionic hydrophilic group selected from the group consisting of hydrophilic groups having an N-monoalkyl substituted structure and hydrophilic groups having an N-dialkyl substituted amide group.
3. The abrasive pad according to claim 1 , wherein an amount of the graft-polymer chain introduced into the base material is 10.0% to 150.0% in terms of graft ratio.
4. The abrasive pad according to claim 2 , wherein an amount of the graft-polymer to be introduced into the base material is 10.0% to 150.0% in terms of graft ratio.
5. The abrasive pad according to claim 1 , wherein the base material comprises a polymer selected from the group consisting of a polyolefin- type polymer, an aryl-type polymer, a diene-type polymer, a silicone-type polymer and a fluorine-type polymer.
6. The abrasive pad according to claim 1 , wherein the graft-polymer chain having a hydrophilic group has a molecular weight Mw ranging from 500 to 5,000,000.
7. The abrasive pad according to claim 1 , wherein the graft-polymer chain having a hydrophilic group has a molecular weight Mw ranging from 1,000 to 1,000,000.
8. The abrasive pad according to claim 1 , wherein the graft-polymer chain having a hydrophilic group has a molecular weight Mw ranging from 2,000 to 500,000.
9. The abrasive pad according to claim 1 , having a thickness of 0.2 to 30 mm.
10. The abrasive pad according to claim 1 , having a thickness of 0.3 to 10 mm.
11. The abrasive pad according to claim 1 , having a thickness of 0.5 to 3 mm.
12. The abrasive pad according to claim 1 , further comprising a cushion layer on one face of the base material.
13. The abrasive pad according to claim 12 , the cushion layer comprises a material selected from the group consisting of a nonwoven fabric impregnated with a resin, an elastomer, a foam elastic material and a foam plastic.
14. The abrasive pad according to claim 12 , wherein the cushion layer has a thickness in the range of 0.1 to 100 mm.
15. The abrasive pad according to claim 12 , wherein the cushion layer has a thickness in the range of 0.2 to 5 mm.
16. The abrasive pad according to claim 12 , wherein the cushion layer has a thickness in the range of 0.5 to 2 mm.
17. The abrasive pad according to claim 1 , wherein the graft-polymer chain is additionally present inside the base material.