Polyester film for laminated metal sheet drawing and processing containing solid lubricant and having specified protrusion rate
US5372867A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 1991 |
| Grant date | Dec 13, 1994 |
| Priority date | — |
| Expiry date | Sep 6, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A polyester film for metal sheet lamination processing which comprises a co-polyester containing a lubricant having an average particle diameter of 2.5 .mu.m or less and the co-polyester having a melting point of 210.degree. to 245.degree. C.; and wherein the refractive index in the direction of film thickness is 1.505 to 1.550, the refractive index in the direction of the film plane is 1.61 to 1.66 about all directions, subpeak by DSC is 150.degree. to 205.degree. C., and optionally, protrusions on the film surface satisfy the formula EQU 0.1.ltoreq.Nd/N.ltoreq.0.5 wherein N is the number of all the protrusions on the film surface and Nd is the number of the protrusions each containing the lubricant as its nucleus and having a sunk hollow around it.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.