Method and means for reducing undesirable effects of dirt particles on a flexible record device

• US 4,335,173 A
• Filed: 09/22/1980
• Issued: 06/15/1982
• Est. Priority Date: 09/22/1980
• Status: Expired due to Term

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Caraballo, Angel
• Primary Examiner(s): Robinson, Ellis P.
• Application Number:
  US06/189,503
• Time in Patent Office: 631 Days
• Field of Search: 428/64, 428/65, 428/480, 428/521, 428/411, 428/518, 428/520, 428/522, 428/483, 358/128.5, 369/286, 369/287, 369/288, 346/76 L, 346/135.1, 346/137
• US Class Current: 428/64.9
• CPC Class Codes: G11B 17/32 Maintaining desired spacing between record carrier and head, e.g. by fluid-dynamic spacing damping of vibrations of record carriers on turntables by fluid-dynamic means G11B19/2018
• CPC Class Codes: G11B 23/505 of disk carriers
• CPC Class Codes: G11B 7/24 Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the arrangement of information on the carrier G11B7/007
• CPC Class Codes: G11B 7/252 of layers other than recording layers
• CPC Class Codes: Y10T 428/31504 Composite [nonstructural laminate]
• 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
• CPC Class Codes: Y10T 428/3192 Next to vinyl or vinylidene chloride polymer
• CPC Class Codes: Y10T 428/31928 Ester, halide or nitrile of addition polymer
• CPC Class Codes: Y10T 428/31931 Polyene monomer-containing
• CPC Class Codes: Y10T 428/31935 Ester, halide or nitrile of addition polymer

Abstract

Methods and means for reducing undesirable effects of dirt particles on a flexible record device are disclosed. These undesirable effects are alleviated in accordance with the present invention by using a multilayer cushioning device to absorb the effect of dirt particles. The multilayer cushioning device comprises an amorphous cushioning layer, a flexible encompassing layer and, optionally, a flexible protective layer. The cushioning device can be superposed on the backside of the flexible record device itself, on a rigid platen of a recording or reading apparatus, or on a separate insert to be placed between the record device and the platen.

Claims

1. In a flexible record device comprising a flexible support layer having a recording layer on one side thereof,

the improvement wherein said flexible record device has superposed on the opposite side of said recording layer a cushioning layer having an average thickness of from about 0.17 millimeter to about 0.64 millimeter completely enveloped either by a flexible encompassing layer or by a flexible encompassing layer and said flexible support layer;

said cushioning layer comprising an amorphous film-forming material and said flexible encompassing layer being immiscible with and inhibiting diffusion therethrough of said amorphous film-forming material.

2. The flexible record device of claim 1 wherein said amorphous film-forming material comprises a solution of from 5 percent to 25 percent by weight of a first polymer and from 95 percent to 75 percent by weight of a solvent for said first polymer, and said flexible encompassing layer comprises a second polymer which is insoluble in said solvent for said first polymer.

3. The flexible record device of claim 2 wherein said first polymer is a water-soluble polymer, said solvent is water and said second polymer is a water-insoluble polymer.

4. The flexible record device of claim 3 wherein said water-soluble first polymer is selected from:

(a) poly(acrylamide);

(b) poly(acrylamide-co-2-acetoacetoxyethyl methacrylate) (weight ratio 90/10); and

(c) poly(2-acrylamido-2-methylpropanesulfonic acid); and

said water-insoluble second polymer is selected from;

(d) cyclized polyisoprene; and

(e) poly(methyl methacrylate).

5. The flexible record device of claim 1 wherein said amorphous film-forming material comprises a solution of 10 percent by weight of poly(2-acrylamido-2-methylpropanesulfonic acid) and 90 percent by weight of water, and said flexible encompassing layer comprises cyclized polyisoprene.

6. The flexible record device of claim 2 wherein said first polymer is a water-insoluble polymer, said solvent is an organic solvent, said second polymer is a water-soluble polymer and said flexible record device comprises, superposed on said flexible encompassing layer, a flexible protective layer which is water-insoluble and inhibits diffusion of water therethrough.

7. The flexible record device of claim 1 wherein said flexible support layer is a reflective flexible support layer.

8. The flexible record device of claim 7 wherein said reflective support layer comprises a layer of poly(ethylene terephthalate) having aluminum superposed thereon.

9. The flexible record device of claim 1 wherein said recording layer comprises a dye and a binder.