Steel plate bonding process and primer composition
First Claim
1. A process for bonding steel sheets which comprises applying a primer composition comprising 0.1 to 2.5 weight parts of a bisphenol type A epoxy resin having a mean molecular weight greater than about 800 per 1 weight part of a thermosetting phenolic resin obtained by reacting an aqueous solution of a mixture of orthocresol and phenol in a weight ratio of orthocresol to phenol ranging from about 60 :
- 40 to 10 ;
90 with formaldehyde in the presence of an alkali catalyst, to the surface of the steel sheets, curing the applied primer composition on the steel sheet surfaces, and then bonding said steel sheets with a polyamide.
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Abstract
A process for bonding steel sheets, e.g., into metallic cans, which comprises applying first a primer comprising 0.1 to 2.5 weight parts of a bisphenol type A epoxy resin having a mean molecular weight of more than about 800, preferably 2000 to 4000, and 1 weight part of thermosetting phenolic resin, which is obtained by heating an aqueous solution comprising phenol, orthocresol and formaldehyde in the presence of a catalyst and reacting them with each other under refluxing conditions, on the surface of the steel sheets, heating the resultant steel sheets, and then bonding the steel sheets with a polyamide, and a primer composition for use in the process.
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Citations
8 Claims
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1. A process for bonding steel sheets which comprises applying a primer composition comprising 0.1 to 2.5 weight parts of a bisphenol type A epoxy resin having a mean molecular weight greater than about 800 per 1 weight part of a thermosetting phenolic resin obtained by reacting an aqueous solution of a mixture of orthocresol and phenol in a weight ratio of orthocresol to phenol ranging from about 60 :
- 40 to 10 ;
90 with formaldehyde in the presence of an alkali catalyst, to the surface of the steel sheets, curing the applied primer composition on the steel sheet surfaces, and then bonding said steel sheets with a polyamide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- 40 to 10 ;
Specification