Antistatic drafting films

• US 5,312,671 A
• Filed: 05/21/1991
• Issued: 05/17/1994
• Est. Priority Date: 05/21/1991
• Status: Expired due to Fees

• Current Assignee: Arkwright Incorporated (Andritz AG)
• Original Assignee: Arkwright Incorporated (Andritz AG)
• Inventors: Paul, Sankar K., Atherton, David, Gager, Morgan E.
• Primary Examiner(s): Loney, Donald J.
• Application Number:
  US07/702,803
• Time in Patent Office: 1,092 Days
• Field of Search: 428/156, 428/172, 428/142, 428/147, 428/212, 428/327, 428/331, 428/143, 428/402, 428/206, 428/913, 430/14, 430/162
• US Class Current: 428/143
• CPC Class Codes: G03F 1/68 Preparation processes not covered by groups G03F1/20 - G03F1/50
• CPC Class Codes: G03G 7/002 Organic components thereof
• CPC Class Codes: Y10T 428/24372 Particulate matter
• CPC Class Codes: Y10T 428/24405 Polymer or resin [e.g., natural or synthetic rubber, etc.]
• CPC Class Codes: Y10T 428/24612 Composite web or sheet
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/254 Polymeric or resinous material
• CPC Class Codes: Y10T 428/259 Silicic material

Abstract

A matte drafting sheet composite at least one side of which comprises a single polymeric matrix layer containing particulates to provide a matte or drafting surface and a quaternary ammonium salt of high charge density at a concentration sufficient to provide a resistivity of said matrix layer of at most about 1×10¹³ ohms/square.

Claims

1. A film composite comprising a substrate having on at least one side thereof a polymeric matrix layer which provides a matte drafting surface to the film composite and which contains particulates and a quaternary ammonium salt, the cation of the quaternary ammonium salt having a charge density of from 3.33×

10^-3 to 13.5×

10^-3 at a concentration sufficient to provide a surface resistivity of said matrix layer of at most about 1×

10¹³ ohms/square at 50% RH.

2. A film composite as recited in claim 1, wherein the charge density of the quaternary ammonium cation is from 6.67×

10^-3 to 13.5×

10^-3 at a concentration sufficient to provide a surface resistivity of said matrix layer of at most about 1×

10¹³ ohms/square at 50% RH.

3. A film composite as recited in claim 1 or 2, wherein said matrix layer has a surface resistivity of about 1×

10⁸ to 1×

10¹³ ohms/square.

4. A film composite as recited in claim 1 or 2, wherein said matrix layer has a surface resistivity of about 1×

10¹⁰ to 1×

10¹³ ohms/square.

5. A film composite as recited in claim 1 or 2, wherein said quaternary ammonium salt contains an anion of a strong acid.

6. A film composite as recited in claim 5, wherein said anion is selected from the group consisting of Cl^-, CH₃ SO₄^- and H₂ PO₄^-.

7. A film composite as recited in claim 5, wherein the quaternary ammonium salt is encompassed by the following Formula I:

##STR2## wherein R₁, R₂, R₃ and R₄ are the same or different and are selected from the group consisting of;

substituted or unsubstituted C₁ -C₃ alkyl groups wherein the alkyl groups may be substituted by hydroxy, C_1-3 alkoxy, amido or acyl, substituted or unsubstituted C₂ -C₃ alkenyl groups wherein the alkenyl groups may be substituted by hydroxy, C_1-3 alkoxy or amido, and substituted or unsubstituted C₂ -C₃ alkynyl groups wherein the alkynyl groups may be substituted by hydroxy, C_1-3 alkoxy or amido, and X is the anion of a strong acid;

with the proviso that the formula weight of the Formula I compound cation is from 74 to about 300 amu.

8. A film composite as recited in claim 1 or 2, wherein on a side of the film opposite the matte drafting surface is an image-forming layer.

9. A film composite as recited in claim 1 or 2, wherein said film composite comprises two separate matte drafting surfaces on opposite sides thereof.

10. A film composite as recited in claim 1, wherein the quaternary ammonium salt is present in the polymeric matrix layer in an amount of from about 0.3 to 1.2% by weight.

11. A film composite comprising a substrate having on at least one side thereof a thermoplastic polymeric matrix layer which provides a matte drafting surface to the film composite and which contains particulates and

a quaternary ammonium salt of the following Formula I:

##STR3## wherein R₁, R₂, R₃ and R₄ are the same or different and are selected from the group consisting of;

substituted or unsubstituted C₁ -C₃ alkyl groups wherein the alkyl groups may be substituted by hydroxy, C_1-3 alkoxy, amido or acyl, substituted or unsubstituted C₂ -C₃ alkenyl groups wherein the alkenyl groups may be substituted by hydroxy, C_1-3 alkoxy or amido, and substituted or unsubstituted C₂ -C₃ alkynyl groups wherein the alkynyl groups may be substituted by hydroxy, C_1-3 alkoxy or amido, and X is the anion of a strong acid;

with the proviso that the formula weight of the Formula I compound cation is from 74 to about 300 amu and that the charge density of the quaternary ammonium cation is from 3.33×

10^-3 to 13.5×

10^-3, and that the cation is present at a concentration sufficient to provide a surface resistitivy of said matrix layer of at most about 1×

10¹³ ohms/square at 50% RH.

12. A film composite as recited in claim 11, wherein the charge density of the Formula I compound cation is from 6.67×

10^-3 to 13.5×

10^-3 at a concentration sufficient to provide a surface resistivity of said matrix layer of at most about 1×

10¹³ ohms/square at 50% RH.

13. A film composite as recited in claim 11 or 12, wherein the Formula I compound anion is selected from the group consisting of Cl^-, CH₃ SO₄^- and H₂ PO₄^-.

14. A film composite as recited in claim 11 or 12 wherein on a side of the film opposite the matte drafting surface is an image-forming layer.

15. A film composite as recited in claim 14, wherein the image-forming layer is an electrostatic imaging layer.

16. A film composite as recited in claim 11 or 12, wherein said film composite comprises two separate matte drafting surfaces on opposite sides thereof.

17. A film composite as recited in claim 11, wherein the quaternary ammonium salt is present in the polymeric matrix layer in an amount of from about 0.3 to 1.2% by weight.

18. A film composite comprising a substrate having on one side thereof a thermoplastic polymeric matrix layer which provides a matte drafting surface to the substrate, and on a side opposite the matte drafting surface of the film an image-forming layer,

wherein, said matte drafting surface contains a particulate and a quaternary ammonium salt, the cation of the quaternary ammonium salt having a charge density of from 3.33×

10^-3 to 13.5×

10^-3 at a concentration sufficient to provide a surface resistivity of said matrix layer of at most about 1×

10¹³ ohms/square at 50% RH.

19. A film composite as recited in claim 18, wherein the charge density of the quaternary ammonium cation is from 6.67×

10^-3 to 13.5×

10^-3 at a concentration sufficient to provide a surface resistivity of said matrix layer of at most about 1×

10¹³ ohms/square at 50% RH.

20. A film composite as recited in claim 18 or 19, wherein said quaternary ammonium salt contains an anion of a strong acid.

21. A film composite as recited in claim 20, wherein said anion is selected from the group consisting of Cl^-, CH₃ SO₄^- and H₂ PO₄^-.

22. A film composite as recited in claim 18 or 19, wherein said quaternary ammonium salt is encompassed by the following Formula I:

##STR4## wherein R₁, R₂, R₃ and R₄ are the same or different and are selected from the group consisting of;

substituted or unsubstituted C₁ -C₃ alkyl groups wherein the alkyl groups may be substituted by hydroxy, C_1-3 alkoxy, amido or acyl, substituted or unsubstituted C₂ -C₃ alkenyl groups wherein the alkenyl groups may be substituted by hydroxy, C_1-3 alkoxy or amido, and substituted or unsubstituted C₂ -C₃ alkynyl groups wherein the alkynyl groups may be substituted by hydroxy, C_1-3 alkoxy or amido; and

X is the anion of a strong acid;

with the proviso that the formula weight of the Formula I compound cation is from 74 to about 300 amu.

23. A film composite as recited in claim 18, wherein the quaternary ammonium salt is present in the polymeric matrix layer in an amount of from about 0.3 to 1.2% by weight.

24. A film composite as recited in claim 22, wherein the quaternary ammonium salt is present in the polymeric matrix layer in an amount of from about 0.3 to 1.2% by weight.

25. A film composite comprising a substrate having on at least one side thereof a single polymeric matrix layer which provides a matte drafting surface to the film composite and which contains particulates and a quaternary ammonium salt, the cation of the quaternary ammonium salt having a charge density of from 3.33 ×

10^-3 to 13.5×

10^-3 at a concentration sufficient to provide a surface resistivity of said matrix layer of at most about 1×

10¹³ ohms/square at 50% RH.