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US 5,028,285 AGranted
Process for bonding leather to leather
OwnerAdolf Wylerinventor
Life of this patent
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Abstract
Bonding of leather to leather without the use of any adhesives is achieved by pressing together the two leather portions to be bonded at a pressure of at least about 50 bar and at a bonding temperature of from about 60.degree. to about 200.degree. C. for at least 10 seconds and subsequently cooling them or allowing them to cool while maintaining a pressure of at least about 10 bar at any time during said cooling when the temperature is above about 85.degree. C., the entire process being conducted in an oxygen-poor environment.
Claims13
A process for bonding two portions consisting essentially of natural leather to each other, which comprises
- pressing said portions together at a constant zone at which the bonding is to be effected, at a pressure of at least about 50 bar and at a bonding temperature of from 60.degree. to about 200.degree. C. for at least 10 seconds, and
- subsequently cooling the thus pressed portions while maintaining a pressure of at least about 10 bar during said cooling when the temperature is above about 85.degree. C.;
- the entire process being conducted in an oxygen-poor environment and without use of any auxiliary bonding agent.
Dependencies are inferred from the claim text.