Antistatic plastic moldings

• US 5,372,924 A
• Filed: 05/16/1994
• Issued: 12/13/1994
• Est. Priority Date: 05/21/1992
• Status: Expired due to Term

• Current Assignee: Agfa-Gevaert AG (Agfa-Gevaert N.V.)
• Original Assignee: Agfa-Gevaert AG (Agfa-Gevaert N.V.)
• Inventors: Rehbein, deceased, Hans, Fischer, Wolfgang, Jonas, Friedrich, Quintens, Dirk, Ohst, Holger
• Primary Examiner(s): BRAMMER, JACK
• Application Number:
  US08/243,068
• Time in Patent Office: 211 Days
• Field of Search: 430/527, 430/530, 430/270, 430/271, 430/281
• US Class Current: 430/527
• CPC Class Codes: C08G 61/126 with a five-membered ring containing one sulfur atom in the ring
• CPC Class Codes: C08J 2323/06 Polyethene
• CPC Class Codes: C08J 2433/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C08J 7/042 with two or more layers, where at least one layer of a composition contains a polymer binder
• 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 7/06 with compositions not containing macromolecular substances
• CPC Class Codes: G03C 1/7614 Cover layers; Backing layers; Base or auxiliary layers characterised by means for lubricating, for rendering anti-abrasive or for preventing adhesion characterised by the inert particulate additive G03C1/95
• CPC Class Codes: G03C 1/85 characterised by antistatic additives or coatings

Abstract

Antistatically treated plastic moldings which contain two layers on the surface to be antistatically treated, the layer situated nearer the plastic surface being an antistatic layer and the more remote layer being a protective layer of a radiation-curing coating composition which is cured by exposure to ionizing radiation, are distinguished by excellent antistatic properties and very good surface properties.

Claims

1. An antistatic element comprising:

a plastic support having a surface;

a first layer on the surface of said plastic support, said first layer being polythiophene made up of units of the formula ##STR2## in which R₁ and R₂ independently of one another represent hydrogen or a C_1-4 alkyl group or, together form an optionally substituted C_1-4 alkylene radical, preferably an optionally alkyl-substituted methylene radical, an optionally C_1-12 alkyl- or phenyl-substituted 1,2-ethylene radical, a 1,3-propylene radical or a 1,2-cyclohexylene radical and

An.sup.(-) is a polyanion; and

a second layer, said second layer being a prepolymer which is curable by exposure to ionizing radiation.

2. A composition as claimed in claim 1, wherein the ionizing radiation-curable prepolymer is a prepolymer containing (meth)acryloyl groups.

3. A composition as claimed in claim 2, wherein the prepolymer contains 2 to 4 (meth)acryloyl groups per molecule.

4. A composition as claimed in claim 2, wherein the prepolymer is a urethane acrylate, an epoxyacrylate, a polyester acrylate, an amine-modified polyester acrylate, a polyether acrylate or an aromatic polyether urethane.

5. A composition as claimed in claim 1, wherein the prepolymer consists of

(a) 25 to 95 parts by weight (meth)acryloyl-functional prepolymer,

(b) 0 to 125 parts by weight reactive diluent,

(c) 0 to 35 parts by weight amine-modified polyether acrylate,

(d) 0 to 7.5% by weight UV initiator and

(e) 0.1 to 5.0% by weight other additives, the percentages by weight being based on the sum of (a), (b) and (c).

6. A composition as claimed in claim 1, wherein the plastic moldings are support materials for photographic elements.

7. An antistatic layered element comprising:

a plastic coated support;

a first layer of polythiophene made up of units of the formula ##STR3## in which R₁ and R₂ independently of one another represent hydrogen or a C_1-4 alkyl group or, together form an optionally substituted C_1-4 alkylene radical, preferably an optionally alkyl-substituted methylene radical, an optionally C_1-12 alkyl-or phenyl-substituted 1,2-ethylene radical, a 1,3-propylene radical or a 1,2-cyclohexylene radical,

An.sup.(-) is a polyanion; and

a second layer, which layer is a prepolymer curable by exposure to ionizing radiation.