Rohm and Haas Company

Frank Thomas Sanderson

Alexander Kowalski

Richard E Zdanowski

Roger H Kottke

In manufacturing industrial products such as automobiles, it is known to adhere rigid solid objects such as emblems, the manufacturer's name, body trim, and so forth to the automobile body by means of a relatively thick sheet of resilient foamed plastic such as polyurethane, for example, 30 one thousands of an inch (30 mils) in thickness, coated on each face with a pressure sensitive adhesive. This provides a cushioning effect to take care of the wide variations in the uniformity of the emblems and further provides a cushion so that when the emblem is struck a blow it does not pop off as would be the case with a thin adhesive layer absent the foam layer. The present invention, by providing a permanently pressure sensitive adhesive composition as a thick, backing-free sheet with the resilience of a soft rubber and certain critical characteristics as to the physical nature of the adhesive, makes it possible to completely eliminate the foam sheet and yet have a thick cushioning material which will permanently adhere the rigid body to the automobile or other surface. Specifically, the adhesive when cured retains its pressure sensitive characteristics, has the resiliency of a soft rubber, a thickness of 8 mils, and certain other critical physical characteristics relating to tensile strength, glass transition temperature, and elongation.

Backing-free massive thickness pressure sensitive adhesive sheet and

The pressure sensitive adhesive of this invention has improved shear resistance while still having good tackiness and stability in a humid atmosphere, it is prepared by solution polymerization, or by other methods, and has carboxylic acid groups therein, an alkoxyalkyl ester of an unsaturated carboxylic acid, an hydroxyalkyl ester of an unsaturated carboxylic acid having at least one hydroxyl functionality and, in many cases, an alkyl acrylate or an alkyl methacrylate. A crosslinker may be used, and the adhesive cured by heat, without destroying the proper relationship of tack and shear resistance.

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Huntingdon Valley, PA, United States of America

Frank Thomas Sanderson