Process for producing polishing pads comprising a fully impregna

Details Process for producing polishing pads comprising a fully impregna Process for producing polishing pads comprising a fully impregna

1983-11-17

1985-04-16

McCamish, Marion E.

Coating processes

Foraminous product produced

Microporous coating

427342, 427392, 427439, B05D 500

Patent

active

045116059

ABSTRACT:
A method for producing a polishing pad is disclosed. The method involves uniformly fully impregnating a fibrous batt with an aqueous polyurethane dispersion, coagulating the polyurethane dispersion to form an impregnant and drying the impregnant. The aqueous polyurethane dispersion may include colloidal silica. Heat and pressure are applied simultaneously to at least one surface of the impregnant to form a composite having a bulk density approaching the actual density of the impregnant at the polishing surface while maintaining microporosity throughout the structure. An adhesive is applied to the surface opposing the polishing surface to form an adhesive backed polishing pad. The polishing pad is comprised of a polymer homogeneously impregnated fibrous batt with the polishing surface having a bulk density approaching its actual density.

REFERENCES:
patent: 4171391 (1979-10-01), Parker
"Politex--The Right Porochemistry for Polishing," The GEOS Corporation, pp. 1 and 2.
"Polishing Media," The GEOS Corporation, No. 1, Feb. 1982, pp. 1 and 2.

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