Antistatic polyester film

• US 5,194,327 A
• Filed: 04/22/1991
• Issued: 03/16/1993
• Est. Priority Date: 04/20/1990
• Status: Expired due to Fees

• Current Assignee: Teijin Limited
• Original Assignee: Teijin Limited
• Inventors: Takahashi, Teruo, Miura, Sadayoshi
• Primary Examiner(s): Thibodeau, Paul J.
• Assistant Examiner(s): NAKARANI, DHIRAJLAL S
• Application Number:
  US07/688,425
• Time in Patent Office: 694 Days
• Field of Search: 428/327, 428/341, 428/331, 428/483, 428/922
• US Class Current: 428/327
• CPC Class Codes: C08J 2367/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds; C08J2367/06 takes precedence
• CPC Class Codes: C08J 2451/00 Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds for ABS polymers C08J2455/02; Derivatives of such polymers
• CPC Class Codes: C08J 7/0427 with only one layer of a composition containing a polymer binder with more layers C08J7/042
• CPC Class Codes: C08J 7/043 Improving the adhesiveness of the coatings per se, e.g. forming primers adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50
• CPC Class Codes: C08J 7/044 Forming conductive coatings; Forming coatings having anti-static properties
• CPC Class Codes: C08J 7/046 Forming abrasion-resistant coatings; Forming surface-hardening coatings
• CPC Class Codes: C08J 7/056 Forming hydrophilic coatings
• CPC Class Codes: Y10S 428/922 Static electricity metal bleed-off metallic stock
• CPC Class Codes: Y10T 428/254 Polymeric or resinous material
• CPC Class Codes: Y10T 428/259 Silicic material
• CPC Class Codes: Y10T 428/273 of coating
• CPC Class Codes: Y10T 428/31797 Next to addition polymer from unsaturated monomers

Abstract

An antistatic polyester film comprises a polyester film having provided on one or both surfaces thereof a thin layer of a mixed composition, wherein

(1) the mixed composition is composed essentially of

(A) a polyester polyacrylic copolymer (component A);

(B) an anion-type high molecular weight antistatic agent (component B);

(C) a fine particle having an average particle diameter of no greater than about 0.5 μm (component C); and

(D) a wetting agent (component D); and wherein

(2) said components A, B, C, and D are present in amounts of about 20 to about 80 parts by weight, about 15 to about 70 parts by weight, about 5 to about 40 parts by weight, and 0 to about 30 parts by weight, respectively, per 100 parts by weight in total of the components A, B and C. Also, a method for producing such antistatic polyester film is described.

Claims

1. An antistatic polyester film comprising a polyester film having provided on one or both surfaces thereof a layer of a mixed composition, wherein

(1) said mixed composition is composed essentially of

(A) a polyester polyacrylic copolymer;

(B) an anionic antistatic agent having a weight average molecular weight of about 5000 to 500,000;

(C) particles having an average particle diameter of no greater than about 0.5 μ

m and being formed by at least one organic polymer selected from the group consisting of polymethyl methacrylate, methyl methacrylate copolymers and cross-linked methyl methacrylate copolymers;

(D) a wetting agent; and

wherein

(2) said components A, B, C, and D are present in amounts of about 20 to about 80 parts by weight, about 15 to about 70 parts by weights, about 5 to about 40 parts by weight, and 0 to about 30 parts by weight, respectively, per 100 parts by weight in total of said components A, B and C.

2. The polyester film as claimed in claim 1, wherein said components A, B, C, and D are present in amounts of about 30 to about 70 parts by weight, about 20 to about 60 parts by weight, about 10 to about 30 parts by weight, and 0 to about 20 parts by weight, perspectively, per 100 parts by weight in total of said components A, B and C.

3. The polyester film as claimed in claim 1, wherein said polyester film has a layer of said mixed composition, said layer having a thickness of about 0.01 to about 0.3 g per m² per surface.

4. The polyester film as claimed in claim 1, wherein said mixed composition is a homogeneous mixture composed of said components A, B, C, and D.

5. The polyester film as claimed in claim 1, wherein said component A is a water-soluble or water dispersible polyester polyacrylic copolymer.

6. The polyester film as claimed in claim 1, wherein said component A is at least one member selected from the group consisting of

A-1 a polyester polyacrylic graft copolymer whose backbone polymer is a polyester and whose branch polymer is an acrylic polymer;

A-2 a polyester polyacrylic graft copolymer whose backbone polymer is a polyacrylic polymer and whose branch polymer is a polyester; and

A-3 a polyester polyacrylic block copolymer;

each of said components A-1, A-2 and A-3 being water-soluble or water-dispersible.

7. The polyester film as claimed in claim 1, wherein said component A is said component A-1 being water-soluble or water-dispersible.

8. The polyester film as claimed in claim 1, wherein said component B is a water-soluble or water-dispersible anionic antistatic agent.

9. The polyester film as claimed in claim 1, wherein said component B is a water-soluble antistatic agent obtained by (co)polymerizing a monomer component consisting essentially of j

(i) about 30 to 100% by weight of a compound represented by formula (I) ##STR4## wherein R₁, R₂, and R₃ independently represent a hydrogen atom or a lower alkyl group;

R₄ represents an alkylene chain having 1 to 6 carbon atoms which can be optionally substituted with a lower alkyl group and wherein said alkylene chain may be interrupted with 1 to 3 hetero atoms selected from the group consisting of N, O and S;

X represents an alkali metal, or --NH(R₅)₃ where R₅ represents a hydrogen atom or a lower alkyl group; and

n is 0 or 1; and

(ii) 0 to 70% by weight of a compound which is other than the compound (i) above and is copolymerizable therewith.

10. The polyester film as claimed in claim 1, wherein said component C has an average particle diameter of about 0.01 to about 0.15 μ

m.

11. The polyester film as claimed in claim 1, wherein said component D is a surfactant an aqueous solution of which can have a surface tension of no higher than 50 dyne/cm on a surface of said polyester film.

12. The polyester film as claimed in claim 1, wherein said component D is an anionic or nonionic surfactant.