The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 16, 1985
Filed:
Nov. 17, 1983
John R McCartney, Westtown, PA (US);
Norwood Industries, Inc., Malvern, PA (US);
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.