Magnetic recording medium comprising an oriented polyester substrate, an antistatic coating of a polymer with pyrrolidium rings in the main chain and a magnetic layer

• US 5,206,084 A
• Filed: 10/08/1991
• Issued: 04/27/1993
• Est. Priority Date: 12/04/1987
• Status: Expired due to Term

• Current Assignee: Diafoil Hoechst Company, Limited
• Original Assignee: Diafoil Hoechst Company, Limited
• Inventors: Kita, Masahiro, Takeda, Naohiro, Okajima, Nariaki, Otani, Yuzo
• Primary Examiner(s): Thibodeau, Paul J.
• Assistant Examiner(s): Resan, Stevan A.
• Application Number:
  US07/774,522
• Time in Patent Office: 567 Days
• Field of Search: 428/694, 428/900, 428/64, 428/480, 428/483, 428/500, 428/336, 428/704, 428/447
• US Class Current: 428/336
• CPC Class Codes: B41M 2205/02 Dye diffusion thermal transfer printing (D2T2)
• CPC Class Codes: B41M 2205/06 relating to melt (thermal) mass transfer
• CPC Class Codes: B41M 5/41 Base layers supports or substrates
• CPC Class Codes: B41M 5/42 Intermediate, backcoat, or covering layers B41M5/405 takes precedence; multilayer thermal transfer systems in general B41M5/38214
• CPC Class Codes: B41M 5/426 characterised by inorganic compounds, e.g. metals, metal salts, metal complexes
• CPC Class Codes: B41M 5/44 characterised by the macromolecular compounds
• CPC Class Codes: B41M 5/443 Silicon-containing polymers, e.g. silicones, siloxanes
• CPC Class Codes: G11B 5/73931 Two or more layers, at least one layer being polyester
• CPC Class Codes: Y10S 428/90 Magnetic feature
• CPC Class Codes: Y10S 428/91 Product with molecular orientation
• CPC Class Codes: Y10T 428/265 1 mil or less
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31797 Next to addition polymer from unsaturated monomers

Abstract

Disclosed herein are a stretched antistatic laminate film comprising at least one coating layer containing a polymer having pyrrolidium rings in the main molecular chain, and a polyester film layer, a magnetic recording medium using the same, and a recording material for heat sensitive transfer printing using the same.

Claims

1. A magnetic recording medium, comprising:

a stretched antistatic laminate film comprising at least one coating layer containing a polymer having pyrrolidium rings in the main chain of the polymer and a polyester film layer, and

a magnetic layer laminated over the coating layer,

wherein said stretched antistatic laminate film comprising at least one coating layer having a thickness in the range of from 0.01 to 5 μ

m and containing a polymer having pyrrolidium rings in the main chain of the polymer on a polyester film layer, said polymer having pyrrolidium rings in the main chain of the polymer containing the repeating unit represented by the following formula (I) or (II);

##STR7## wherein R¹ and R² independently represent respectively an alkyl or phenyl group which maybe substituted, R¹ and R² may chemically bond to form a ring, or one of R¹ and R² represents a hydrogen atom and X- represents a halogen atom, an inorganic acid residue, and organic sulfonic acid residue or a carboxylic acid residue, said coating layer being formed on the polyester film layer by an in-line coating method, said in-line coating method comprising applying said coating layer to a uniaxially stretched polyester film which has been uniaxially stretched by 2-6 times at a temperature from 60°

to 130°

C. by a roll stretching method and then optionally drying, stretching the resultant coated uniaxially stretched polyester film by 2-6 times at a temperature from 80°

to 130°

C., in the direction perpendicular to the uniaxial stretching direction and then heat treating the coated stretched polyester film at a temperature from 150°

to 250°

for 1 to 600 seconds.

2. The magnetic recording medium of claim 1, wherein said coating layer further comprises a polyvinyl alcohol and a cationic zirconium compound.

3. The magnetic recording medium of claim 1, wherein said coating layer further contains a crosslinking agent.

4. The magnetic recording medium of claim 2, wherein said coating layer further contains a crosslinking agent.

5. The magnetic recording medium of claim 1, wherein the molecular weight of said polymer having pyrrolidium rings in the main chain of the polymer is from 500 to 1,000,000.

6. The magnetic recording medium of claim 1, further comprising a silicone resin layer comprising an organo polysiloxane laminated over said coating layer.