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Method to Promote Adhesion of Thermoplastic Polyurethane to a Substrate of Metal or Plastic

IP.com Disclosure Number: IPCOM000050796D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Ehn, DS: AUTHOR [+2]

Abstract

Thermoplastic urethane is adhered to a metal or plastic substrate by placing a reactive urethane coating on a primer with this urethane remaining uncured while a thermoplastic urethane coating is applied. The process is believed applicable wherever thermoplastic urethane has no reactive characteristics adequate for bonding to the substrates.

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Method to Promote Adhesion of Thermoplastic Polyurethane to a Substrate of Metal or Plastic

Thermoplastic urethane is adhered to a metal or plastic substrate by placing a reactive urethane coating on a primer with this urethane remaining uncured while a thermoplastic urethane coating is applied. The process is believed applicable wherever thermoplastic urethane has no reactive characteristics adequate for bonding to the substrates.

In a typical example, a substrate of metal, such as aluminum, is initially primed with a wash primer. The substrate is coated with a low cross-link density moisture cured urethane such as Hughson Chemicals Z004. The solvent is allowed to evaporate, but the coating is not cured. Thermoplastic urethane dissolved in a suitable solvent is sprayed or otherwise coated on the prepared substrate. The solvents are evaporated, and the assembly is baked in an oven at 60 degrees C for two hours.

The moisture-cured urethane is a prepolymer urethane which crosslinks in the presence of moisture to form a thermosetting urethane coating. The thermoplastic urethane has hydroxyl sites and urethane linkages which are available to react with the isocyanate in the moisture-cured urethane forming chemical bonds. Hence the two coatings are chemically bonded together, resulting in adhesion between the metal substrate and the thermoplastic urethane.

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