Antistatic compositions and elements containing same

• US 4,335,201 A
• Filed: 11/24/1980
• Issued: 06/15/1982
• Est. Priority Date: 11/24/1980
• Status: Expired due to Term

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Miller, Donald N., Kydd, Richard A.
• Primary Examiner(s): Downey, Mary F.
• Application Number:
  US06/209,554
• Time in Patent Office: 568 Days
• Field of Search: 430/527, 430/631, 430/528, 430/529, 430/635, 430/636, 430/961, 252/8.6, 260/DIG. 15, 260/117, 57/901, 106/125
• US Class Current: 430/527
• CPC Class Codes: G03C 1/85 characterised by antistatic additives or coatings
• CPC Class Codes: Y10S 260/15 Antistatic agents not otherwise provided for

Abstract

Photographic base elements and radiation-sensitive elements are protected against the adverse effects resulting from accumulation of static electrical charges by incorporating therein an antistatic layer. Such layer is prepared from a coating composition comprising a hydrophilic binder, an anionic fluorinated surfactant and an inorganic nitrate.

Claims

1. A coating composition for use in forming an antistatic layer in a radiation sensitive element, said composition comprising an aqueous solution of:

(a) a hydrophilic binder;

(b) an anionic fluorinated surfactant; and

(c) an inorganic nitrate.

2. The composition of claim 1 wherein said anionic fluorinated surfactant has the formula R--X wherein R is partly or wholly fluorinated hydrocarbon;

and X is --SO₃ M, --OSO₃ M or --COOM wherein M is a monovalent cation.

3. The composition of claim 2 wherein R is partly or wholly fluorinated alkylene and X is --SO₃ M.

4. The composition of claim 1 wherein said nitrate is an alkali metal nitrate.

5. The composition of claim 1 wherein said anionic fluorinated surfactant is present in an amount in the range of from about 0.05 to about 5 percent, by weight, and said inorganic nitrate is present in an amount in the range of from about 5 to about 20 percent, by weight, both based on total dry solids content of said composition.

6. The coating composition of claim 1 additionally containing silica.

7. A photographic base element comprising a support coated with an antistatic layer, said antistatic layer comprising:

(a) a hydrophilic binder;

(b) an anionic fluorinated surfactant; and

(c) an inorganic nitrate.

8. The base element of claim 7 wherein said support is a film support.

9. The base element of claim 7 wherein said support is a paper support.

10. The base element of claim 9 wherein said support is a polyolefin-coated paper support.

11. A radiation-sensitive element comprising:

(1) a support,

(2) a radiation-sensitive, image-forming layer on one side of said support; and

(3) an antistatic layer on the other side of said support, said antistatic layer comprising;

(a) a hydrophilic binder;

(b) an anionic fluorinated surfactant; and

(c) an inorganic nitrate.

12. The radiation-sensitive element of claim 11 wherein said support is a polyolefin-coated paper support.

13. The radiation-sensitive element of claim 11 wherein said radiation-sensitive, image-forming layer is a photosensitive silver halide emulsion layer.

14. The radiation-sensitive element of claim 11 wherein said anionic fluorinated surfactant has the formula R--X wherein R is partly or wholly fluorinated alkylene;

and X is --SO₃ M, --OSO₃ M or --COOM wherein M is a monovalent cation.

15. The radiation-sensitive element of claim 14 wherein said anionic fluorinated surfactant has the formula CF₃ (CF₂)₇ SO₃ M.

16. The radiation-sensitive element of claim 11 wherein said inorganic nitrate is an alkali metal nitrate.

17. The radiation-sensitive element of claim 16 wherein said inorganic nitrate is sodium nitrate.

18. A method of providing antistatic protection for a radiation sensitive element, which method comprises coating a surface of said element with an antistatic coating composition and drying said coating, said antistatic composition comprising:

(a) a hydrophilic binder;

(b) an anionic fluorinated surfactant; and

(c) an inorganic nitrate.

19. A photographic element comprising:

(1) a support;

(2) a photosensitive image-forming layer on one side of said support; and

(3) an antistatic layer on the other side of said support, said antistatic layer comprising;

(a) gelatin;

(b) an anionic fluorinated surfactant having the formula CF₃ (CF₂)₇ SO₃ M wherein M is a monovalent cation; and

(c) an inorganic nitrate.