Minnesota Mining and Manufacturing Company

Manfred E Riechert

Craig Allen Perman

William A Hendrickson

James S Stefely

John E Gozum

Richard C Kao

Joanne M Bartkus

Kelvin J Witcher

Hye-Ok Choi

Foamed thermoplastic articles, both filled and unfilled foamed articles have a foamed density of greater than 0.03 grams per cubic centimeters (g/cm.sup.3), cell sizes in the range of 10 to 300 micrometers (.mu.m) with cell wall thicknesses of greater than 0.1 .mu.m but less than 2 .mu.m and a process for making the same.

Method of making thermoplastic foamed articles using supercritical fluid

Method of polymer impregnation

Methods of impregnating various polymer substrates with an impregnation additive, by simultaneously contacting the polymer substrate with an impregnation additive, carrier liquid, and supercritical fluid are provided. The impregnation additive is substantially insoluble in the supercritical fluid, and the carrier liquid is preferably substantially insoluble in the supercritical fluid.

Methods of polymer impregnation

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Maplewood, MN, United States of America

Manfred E Riechert