Test strips and a process for the production thereof

• US 4,820,489 A
• Filed: 07/09/1986
• Issued: 04/11/1989
• Est. Priority Date: 12/23/1982
• Status: Expired due to Term

• Current Assignee: Boehringer Mannheim GmbH (Roche Holding AG)
• Original Assignee: Boehringer Mannheim GmbH (Roche Holding AG)
• Inventors: Knappe, Wolfgang-Reinhold, Rothe, Anselm, Trasch, Heinz-Friedrich
• Primary Examiner(s): Richman, Barry S.
• Assistant Examiner(s): Johnson, Jill
• Application Number:
  US06/883,612
• Time in Patent Office: 1,007 Days
• Field of Search: 422/56, 422/57, 422/58, 436/169, 436/170, 435/805, 427/2, 427/3
• US Class Current: 422/421
• CPC Class Codes: G01N 33/525 Multi-layer analytical elements
• CPC Class Codes: Y10S 435/805 Test papers

Abstract

A test strip has a reagent-containing film layer coatingly embedded at least preponderantly on and into only one side of a carrier layer made of a multifilar fabric or fleece.

Claims

1. A test strip made by a process which comprises:

providing a carrier layer having an upper side and a lower side and being made of one of a multifilar fabric or fleece;

applying and thereafter drying a coating mass of one of a suspension or dispersion of at least one synthetic resin in a solvent as a layer on the carrier layer so that most of the coating mass remains on the upper side of the carrier layer to obtain a fabric or fleece coated with a film layer of said coating mass wherein said film layer is coatingly embedded at least preponderantly on and into only one side of the carrier layer; and

introducing at least one reagent by at least one of admixing with the resin before the film is formed or impregnating the coated film or fleece.

2. The test strip of claim 1, wherein said carrier layer consists of at least one substance selected from the group consisting of polyester, polyamide, cotton and cellulose.

3. The test strip of claim 1, further comprising a mesh covering which covers the coated fabric or fleece and fixes the carrier layer and the film layer to the synthetic resin film.

4. The test strip of claim 1, wherein said film layer has a thickness when dry, of from about 10μ

to about 200μ

.

5. The test strip of claim 1, wherein said reagent film layer has a thickness, when dry, of from about 15μ

to about 100μ

.

6. The test strip of claim 1, wherein said process further comprises connecting a synthetic resin film and said coated fabric or fleece by a connecting means.

7. The test strip of claim 1 wherein said process further comprises attaching at least one edge of said coated fabric or fleece to a synthetic resin film.

8. The test strip of claim 7 wherein said process further comprises providing an absorbent layer between the coated fabric or fleece and said synthetic resin film.