Thomas West, Inc.

Peter McKeever

Thomas E West

Pepito Galvez

Gary Quigley

Long Van Nguyen

Kevin H Song

Matt Richardson

Suli Holani

Donald Dietz

Jorge Craik

Koli Holani

A method and systems for controlling optical transmissivity of a polish pad material are provided. The method and systems may include adjusting control parameters to determine the optical transmissivity of a polish pad material. The control parameters may also include pre-processing controls, casting controls, and/or curing controls. Methods and systems also provided for assembling a polish pad that controls the optical transmissivity of the polish pad. Additionally, a polish pad with a controlled optical transmissivity is provided.

Method and systems to control optical transmissivity of a polish pad material

A method for making a polishing pad includes rotating a cylinder about a central axis. The cylinder encloses in an interior space a polymer mixture. The method also includes forming the polishing pad from at least some of a polymer formed after the polymer mixture has gelled. The rotating of the cylinder may be continued until the polymer has cured. The method may include forming at least two distinct layers in the polishing pad by casting and gelling sequentially at least two different polymer mixtures. A system for manufacturing a polishing pad includes a centrifugal caster adapted to rotate. A polishing pad made by a method is provided.

Methods and systems for centrifugal casting of polymer polish pads and polishing pads made by the methods

A method for making a multilayer polishing pad includes rotating a cylinder about a central axis. The cylinder encloses in an interior space a single polymer mixture that phase separates under centrifugal force. The method also includes forming the polishing pad from at least some of a polymer formed after the polymer mixture has reacted. The method includes forming at least two distinct layers in the polishing pad by casting and gelling sequentially at least two different polymers.

Multilayer polishing pads made by the methods for centrifugal casting of polymer polish pads

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Redwood City, CA, United States of America

Peter McKeever