Process for producing polishing pads comprising a fully impregnated non-woven batt
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United States of America Patent
Stats
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Apr 16, 1985
Issued Date -
N/A
app pub date -
Nov 17, 1983
filing date -
Sep 18, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Cited Art Landscape
Patent Citation Ranking
- 24 Citation Count
- B05D Class
- 0 % this patent is cited more than
- 40 Age