Web material with an ultrathin coating varnish allowing rapid sustained spreading and/or very rapid, sustained transport of fluids

• US 7,638,190 B2
• Filed: 01/11/2008
• Issued: 12/29/2009
• Est. Priority Date: 01/19/2007
• Status: Expired due to Fees

• Current Assignee: Tesa SE (maxingvest GmbH & Co. KGaA)
• Original Assignee: Tesa SE (maxingvest GmbH & Co. KGaA)
• Inventors: Neubert, Ingo, Klose, Maren
• Primary Examiner(s): Chen; Vivian
• Application Number:
  US11/972,918
• Publication Number:
  US 20080176068A1
• Time in Patent Office: 718 Days
• Field of Search: None
• US Class Current: 428/341
• CPC Class Codes: B01L 3/5023 with a sample being transported to, and subsequently stored in an absorbent for analysis
• CPC Class Codes: C08K 5/42 Sulfonic acids; Derivatives thereof
• CPC Class Codes: C09D 7/47 Levelling agents
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/2495 Thickness [relative or absolute]
• CPC Class Codes: Y10T 428/24967 Absolute thicknesses specified
• CPC Class Codes: Y10T 428/26 Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
• CPC Class Codes: Y10T 428/263 Coating layer not in excess of 5 mils thick or equivalent
• CPC Class Codes: Y10T 428/265 1 mil or less
• CPC Class Codes: Y10T 428/269 including synthetic resin or polymer layer or component
• CPC Class Codes: Y10T 428/27 Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
• CPC Class Codes: Y10T 428/273 of coating
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]

Abstract

Material in web form intended in particular for use in a diagnostic strip and composed of a carrier material coated on one or both sides with an ultrathin coating varnish comprising at least one anionic surfactant based on a sulphosuccinic ester salt, the ultrathin coating varnish having, after drying, a coating distribution of from 5 to 100 mg/m².

Claims

1. Material in web form comprising a carrier material coated on one or both sides with a coating solution consisting essentially of at least one anionic surfactant based on a sulphosuccinic ester salt, the coating solution forms an ultrathin coating varnish having a dried coating application weight of 5 to 52 mg/m², wherein the sulphosuccinic ester salt has the following chemical structure:

R′

OOC—

CH₂—

CH(SO₃⁻

)—

COOR″

M⁺

wherein,

M⁺=Na⁺, and

R′ and

R″

=an alkyl chain.

2. Web material according to claim 1, wherein the ultrathin coating varnish possesses the following properties:

a surface tension of at least 65 mN/m

a contact angle with water of less than 30° and

/or

an areal spread with 0.5 ml of water of at least 10 cm².

3. Web material according to claim 2, wherein the areal spread is 0.5 ml of water on the ultrathin coating varnish after storage at 40°

C. for 10 weeks or at 70°

C. for 10 weeks is at least 85% of the original value prior to storage.

4. Web material according to claim 1, wherein the coating solution is applied over the whole area.

5. Web material according to claim 1, wherein the dried coating application of the ultrathin coating varnish is 15-30 mg/m².

6. Web material according to claim 1, wherein the at least one anionic surfactant consists essentially of sodium bis-2-ethylhexyl sulphosuccinate.

7. Web material according to claim 1, wherein the carrier material is composed of a polyester film having a thickness of 12 to 350 μ

m.

8. Web material according to claim 1, wherein the transport rate of an aqueous test fluid (deionized water and 0.1% by weight of methyl blue) in a channel (75 μ

m×

1 mm) in which the ultrathin coating varnish forms one wall of the channel, is at least 20 mm/s.

9. Web material according to claim 1, wherein the transport rate of an aqueous test fluid (deionized water and 0.1% by weight of methyl blue) in a channel (75 μ

m×

1 mm), in which the ultrathin coating varnish forms one wall of the channel, after storage at 40°

C. for 10 weeks or at 70°

C. for 6 weeks is at least 20 mm/s.

10. A diagnostic strip, biosensor, point-of-care device or microfluidic device used to analyse biological fluids, wherein said diagnostic strip, biosensor, point-of-care device or microfluidic device comprises web material according to claim 1.

11. Process for producing a web material according to claim 1, comprising applying a coating solution comprising a solvent consisting essentially of in solution at least one anionic surfactant based on a sulphosuccinic ester salt, the solids content in the coating solution being less than 2% by weight, to a carrier material and the carrier material with the coating solution is dried so that, after drying, a coating application in the form of an ultrathin coating varnish of 5 to 52 mg/m² is produced, wherein the sulphosuccinic ester salt has the following chemical structure:

R′

OOC—

CH₂—

CH(SO₃⁻

)—

COOR″

M⁺

wherein,

M⁺=Na⁺, and

R′ and

R″

=an alkyl chain.

12. Process according to claim 11, wherein the carrier material is coated on both sides with the coating solution and then dried.

13. Process according to claim 11, wherein the coating of the ultrathin coating varnish takes place with an alcoholic solution that is subsequently dried.

14. Process according to claim 13, wherein the alcoholic solution comprises exclusively the anionic surfactant based on a sulphosuccinic ester salt without further additives.

15. Web material according to claim 1, wherein the alkyl chain is selected from the group consisting of butyl, hexyl and 2-ethylhexyl.

16. Process according to claim 11, wherein the alkyl chain is selected from the group consisting of butyl, hexyl and 2-ethylhexyl.