Steel plate bonding process and primer composition
US3936342A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 1974 |
| Grant date | Feb 3, 1976 |
| Priority date | — |
| Expiry date | Feb 14, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31739
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.