Manufacture of draw-redraw cans using an irradiated film laminated or extrusion coated steel sheet material
US4452374A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 1981 |
| Grant date | Jun 5, 1984 |
| Priority date | — |
| Expiry date | Apr 2, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D25/14
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The use of organic solvent-based coating compositions in the preparation of coated steel feedstock for use in the manufacture of draw-redraw food and beverage cans is eliminated by using as such can feedstock a laminated or extrusion coated steel sheet (e.g., such as electrolytic chrome/chrome oxide coated steel) having adhered to both major planar surfaces thereof an irradiated multilayered synthetic thermoplastic resin coating comprising: PA0 (1) an adhesive synthetic thermoplastic resin inner layer which is composed of at least a major proportion of a normally solid random copolymer of ethylene with from about 1 to about 30 weight percent, based upon the weight of such copolymer, of an ethylenically unsaturated carboxylic acid monomer and which is bonded directly to the surface of said steel sheet and PA0 (2) an outer layer of a synthetic thermoplastic polymer resin which has a crystalline melting point of at least about 250.degree. F. and which is adhered to said adhesive resin inner layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.