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AssigneeRohm and Haas Company
InventorsFrank T. Sanderson, Richard E. Zdanowski
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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.
In a process of adhering a substantially rigid object to a larger solid surface to which it conforms, the improvement of applying to said object or said surface a backing-free sheet consisting of a permanently pressure sensitive adhesive composition comprising a crosslinked addition polymer or a crosslinked addition polymer containing a finely divided bodying agent having a particle size of less than 25 microns, said adhesive having the resilience of a soft rubber, a thickness of 8 mils to 125 mils, a Tg of below 0.degree. C., a tensile strength of from about 15 to 60 psi, and a percent elongation at break of from 500 to 3000 percent, and applying said object to said surface with the adhesive sheet therebetween, whereby said object is permanently adhered to said surface.
An adhesive product consisting essentially of a backing-free layer of pressure sensitive adhesive on a release coated surface, the adhesive comprising a crosslinked addition polymer or a crosslinked addition polymer containing a finely divided bodying agent having a particle size of less than 25 microns, said adhesive having the resilience of a soft rubber, a thickness of 8 mils to 125 mils, a Tg of below 0.degree. C., a tensile strength of from about 15 to 60 psi, and a percent elongation at break of from 500 to 3000 percent.
A substantially rigid applique for an automobile body, said applique having adhered thereto a relatively massive layer of pressure sensitive adhesive comprising a crosslinked addition polymer or a crosslinked addition polymer containing a finely divided bodying agent having a particle size of less than 25 microns, said adhesive having the resilience of a soft rubber, a thickness of 8 mils to 125 mils, a Tg of below 0.degree. C., a tensile strength of from about 15 to 60 psi and a percent elongation at break from 500 to 3000 percent, whereby the adhesive compensates for irregularities of the applique or the automobile body and absorbs and cushions vibrations and blows applied to said applique.
Dependencies are inferred from the claim text.