Process of producing magnetic recording tape having textured backcoat

US5686142A · kind A · utility

Assignee

• Minnesota Mining and Manufacturing Company · US

Inventors

• David Wallack · Hillsboro, US
• Donald M. Lewis · River Falls, US
• John D. Munter · Oakdale, US
• Peter Silbernagel · Ochtrup, DE
• Robert V. Heiti · Hudson, US
• Yuko Yoshida · Platte City, US

Key dates

• Filing date: May 7, 1996
• Grant date: Nov 11, 1997
• Expiry date: May 7, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/30
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

Coated polymeric sheet comprising polymer substrate a cross-linked polymer, wherein the coating is characterized by: PA1 A. being smooth, having a surface roughness not greater than 0.05 nanometers R.sub.a, except that; PA1 B. in the otherwise smooth surface, a multiplicity of depressions having depth ranging from 1 to 90% of the thickness of the coating. Backside coatings (containing carbon black in the cross-linked polymer) for magnetic recording tapes benefit from this invention by improved winding characteristics. The concept described is a replacement for rough random surface texture, formerly used in backside coatings, with a controlled surface texture. The process disclosed can also be used to make alphanumeric symbols on the pigment binder coating.