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:
Sep. 03, 1996
Filed:
Jun. 07, 1995
Frederick A Kish, Wheeling, IL (US);
Michael J Rancich, Mundelein, IL (US);
Illinois Tool Works, Inc., Glenview, IL (US);
Abstract
In a railroad track comprising a railroad rail having a lower flange and a railroad tie made from concrete, a polyurethane pad is mounted between the lower flange of the rail road rail and an upper surface of the railroad tie. A bonding layer at least as flexible as the polyurethane pad is bonded to a lower surface of the polyurethane pad. An adhesive layer is bonded to the upper surface of the railroad tie. The bonding and adhesive layers are bonded to each other, whereby the polyurethane pad and the railroad tie are bonded to each other via the bonding and adhesive layers. Preferably, the adhesive layer comprises a methacrylate ester composition, and the bonding layer comprises either a product of polymerizing a solution of methyl methacrylate copolymer in n-butyl acrylate monomer with an addition of cumene hydroperoxide to the solution or a product of curing or drying a water-based acrylic emulsion. Alternatively, the bonding layer is a product of polymerizing a solution of a thermoplastic elastomer in methyl methacrylate monomer. The solution may have an addition of 1% (by volume) of cumene hydroperoxide to catalyze polymerization. The solution may have a sprayed coat of a dispersion of benzoyl peroxide in a plasticizer or in water to catalyze polymerization.