TACKY FLOOR PAD

• US 3,717,897 A
• Filed: 06/18/1970
• Issued: 02/27/1973
• Est. Priority Date: 06/18/1970
• Status: Expired due to Term

• Current Assignee: Edward T. Strickland, Homer C. Amos
• Original Assignee: Edward T. Strickland, Homer C. Amos
• Inventors: Amos, Homer C., Strickland, Edward T.
• Primary Examiner(s): Machlin, Leon G.
• Application Number:
  US05/047,453
• Time in Patent Office: 985 Days
• Field of Search: 15/215,105 134/6-10
• US Class Current: 15/215
• CPC Class Codes: A47L 23/266 Mats
• CPC Class Codes: B08B 7/0028 by adhesive surfaces

Abstract

At an entrance doorway leading into a clean room is a pad for cleaning shoes and wheels. The pad is substantially as wide as said doorway and longer than a large step taken by a person walking, and it is adhesively adhered to the passageway floor in front of the doorway. The pad has a thin base material and a thin water-washable adhesive covering its upper surface for removing dirt and other foreign matter from shoes and wheels. The adhesive presents a fairly high temporary tack for grabbing dirt aggressively and firmly, yet releasing it readily when washed.

Claims

1. A cleaning pad adapted to be adhesively and removably secured to the floor outside the doorway and disposed before it to remove dirt and other foreign matter from shoes and wheels in contact therewith, said pad being paper-thin and having an upper coating of water-washable solid adhesive.

2. The cleaning pad of claim 1 wherein said adhesive has a Young'"'"''"'"'s modulus of 20 to 50 p.s.i., a tack of from about 3.5* to about 8*, and a viscosity of from 12 min. to 50 min., as measured by the tests described in the specification.

3. The cleaning pad of claim 1 in which the pad has a lower coating of adhesive with a Young'"'"''"'"'s modulus of 150 to 250 p.s.i., and an internal viscosity and free surface energy to stop at between 30* and 70* and to come within 5* of its final position in 80 to 800 minutes.

4. The cleaning pad of claim 1 in which the pad has a lower coating of adhesive with a Young'"'"''"'"'s modulus of about 210 p.s.i., and an internal viscosity and free surface energy to stop at about 45* and to come within 5* of its final position in about 500 minutes.

5. A pad as in claim 1 for cleaning shoes and wheels substantially as wide as said doorway and longer than a large step taken by a person walking, said pad being adhered to said floor just before said doorway, said pad having a thin base material and a thin water-washable adhesive covering its upper surface for removing dirt and other foreign matter from shoes and wheels, said adhesive presenting a fairly high temporary tack for grabbing dirt aggressively and firmly, yet releasing it readily when washed, the water-washable adhesive being a true-solid elastomer having a Young'"'"''"'"'s modulus of elasticity between about 20 and 50 p.s.i., an internal viscosity and a free surface energy sufficiently high to stop at a position between about 3.5* and 8*, when a 1-mil film is cast in a 1-mil polyester terephthalate strip, placed over a polished steel cylinder to obtain 100 percent contact area and a 100 gram weight hung on a trailing edge and allowed to peel under static conditions, coming to a point within 5* of its final position in from about 12 min. to about 50 min.

6. The pad of claim 5 in which the pad has a lower coating of adhesive with a Young'"'"''"'"'s modulus of about 150 to 250 p.s.i., and an internal viscosity and free surface energy to stop at about 30* to 70* and to come within 5* of its final position in 80 to 800 minutes.

7. The pad of claim 5 wherein said pad upper surface has two marginal non-adhesive covered areas exposing said base material, one on the edge facing the doorway and one on the opposite edge.

8. The pad of claim 5 wherein said adhesive on said upper surface has a modulus of about 30 p.s.i., a tack angle of about 5*, and a viscosity of about 12 minutes.

9. A method for keeping foreign matter from being tracked into a clean room, comprising placing at an entrance doorway leading into the clean room, a pad for cleaning shoes and wheels, the pad being substantially as wide as said doorway and longer than a large step taken by a person walking, said pad being adhered to the passageway floor just before said doorway, providing said pad with a thin base material and a thin water-washable adhesive covering its upper surface, removing dirt and other foreign matter from shoes and wheels by said adhesive presenting a fairly high temporary tack for grabbing dirt aggressively and firmly, yet releasing it readily when washed, and occasionally washing dirt and foreign matter from said adhesive to expose a clean surface.

10. The method of claim 9 in which the water-washable adhesive is a true-solid elastomer having a Young'"'"''"'"'s modulus of elasticity between about 20 and 50 p.s.i., an internal viscosity and a free surface energy sufficiently high to stop at a position between 3.5* and 8* when a 1-mil film is cast in a 1-mil polyester terephthalate strip, placed over a polished steel cylinder to obtain 100 percent contact area and a 100 gram weight hung on a trailing edge and allowed to peel under static conditions, coming to a point within 5* of its final position in from 12 min. to 50 min.