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United States Patent | 3,955,016 |
Robertson | May 4, 1976 |
In a double-pass lamination and coating process, aluminum foil is laminated on one side with paper and then rolled for temporary storage before being coated on the other side with polyethylene. Contaminants from the paper impair the ability of aqueous solutions of chromium complex adhesion promoters to bond the polyethylene to the foil. A wash coat of polyvinyl alcohol before rolling eliminates this impairment.
Inventors: | Robertson; James Adolph (West Chester, PA) |
Assignee: |
E. I. Du Pont de Nemours and Company
(Wilmington,
DE)
|
Appl. No.: | 05/496,852 |
Filed: | August 12, 1974 |
Current U.S. Class: | 427/178 ; 156/184; 156/280; 427/209; 427/211; 427/327; 427/388.4; 427/409 |
Current International Class: | B32B 15/08 (20060101); B32B 015/20 (); B32B 027/32 (); B05D 003/00 () |
Field of Search: | 427/178,409,179,209,211,327,388 156/90,280,184 117/75,66,76P,72 242/1 |
3479197 | November 1969 | Mork |
3488252 | January 1970 | Lamar |
3696498 | October 1972 | Leontaritis et al. |
3787326 | January 1974 | Deyrup |