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United States Patent | 5,009,948 |
Debe | April 23, 1991 |
A polymorph of a phthalocyanine, designated M-phthalocyanine or M-metal phthalocyanine, has spectroscopic properties different from those of any of known crystalline polymorphs of phthalocyanine, the polymorph having been prepared in an environment of at most 0.1 G. In a further aspect, a process is disclosed for preparing novel organic films comprising a closed chamber physical vapor transport (PVT) in a low gravity environment. Films of novel polymorphs have a surface roughness factor in the range of greater than 1.000000 and less than 1.000010, a density of at least 50 percent increase over any polymorph of the same molecules produced in unit gravity, and in which at least 50 weight percent of the molecules of said film have a common uniaxial orientation.
Inventors: | Debe; Mark K. (Stillwater, MN) |
Assignee: | Minnesota Mining and Manufacturing Company (St. Paul, MN) |
Appl. No.: | 327898 |
Filed: | March 23, 1989 |
Intern'l Class: | B32B 005/16; B32B 009/00; B05D 003/00 |
Field of Search: | 428/338,141,187,426,689,698,702 540/141 |
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Foreign Patent Documents | |||
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TABLE I ______________________________________ Summary of order parameter and average thickness values for the LEO and ground based (GB) samples Relative Thickness Sample (all values .+-. 30%) Order Parameter ______________________________________ LEO #1 1.00 1.00 LEO #2 0.85 0.92 GB #1 0.9 0.95 GB #2 0.5 0.53 GB #3 0.85 0.66 GB #4 1.0 0.74 GB #5 0.5 0.53 GB #6 0.4 0.68 GB #7 0.6 0.85 ______________________________________