WO1993015905A1 - Layer structure - Google Patents

Layer structure Download PDF

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Publication number
WO1993015905A1
WO1993015905A1 PCT/GB1993/000265 GB9300265W WO9315905A1 WO 1993015905 A1 WO1993015905 A1 WO 1993015905A1 GB 9300265 W GB9300265 W GB 9300265W WO 9315905 A1 WO9315905 A1 WO 9315905A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
layer structure
structure according
load spreading
comprises
Prior art date
Application number
PCT/GB1993/000265
Other languages
French (fr)
Inventor
Ian Walters
Original Assignee
Ian Walters
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to GB9202626.9 priority Critical
Priority to GB929202626A priority patent/GB9202626D0/en
Priority to GB9223275.0 priority
Priority to GB929223275A priority patent/GB9223275D0/en
Application filed by Ian Walters filed Critical Ian Walters
Publication of WO1993015905A1 publication Critical patent/WO1993015905A1/en

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02Physical, chemical or physicochemical properties
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63CSKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C19/00Design or layout of playing courts, rinks, bowling greens or areas for water-skiing; Covers therefor
    • A63C19/04Mats or carpets for courts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/065Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/30Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/32Layered products comprising a layer of synthetic resin comprising polyolefins
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04Interconnection of layers
    • B32B7/12Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C13/00Pavings or foundations specially adapted for playgrounds or sports grounds; Drainage, irrigation or heating of sports grounds
    • E01C13/04Pavings made of prefabricated single units
    • E01C13/045Pavings made of prefabricated single units the prefabricated single units consisting of or including bitumen, rubber or plastics
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/50Properties of the layers or laminate having particular mechanical properties
    • B32B2307/56Damping, energy absorption
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2471/00Floor coverings

Abstract

A layer structure for safety floor covering which comprises a non-foamed rigid load-spreading sheet layer, and at least one impact-absorbing foam layer bounded to the sheet layer. The bottom surface of the layer structure is provided with a layer of adhesive suitable for bonding to a ground surface, the layer of adhesive being preferably covered by a peelable film layer.

Description

Layer Structure

The present invention is concerned with layer structures and in particular, layer structures suitable for safety floor covering. There is a continuing need for improved safety covering surfaces for children's playgrounds, sporting areas and the like which provide impact resistance in a layer which is not of great thickness.

According to the present invention, there is provided a layer structure suitable for such uses, which comprises, in the order specified, an outer covering layer, a non- foamed substantially rigid load spreading sheet layer and at least one impact absorbing foam layer bonded to the undersurface of said load spreading layer, the surface of the layer structure remote from said load spreading layer being provided with a bottom layer of bonding adhesive suitable for bonding to a ground surface or the like.

The foam layer is typically bonded to the sheet layer by means of a hot melt adhesive. This is generally a thermoplastic synthetic hydrocarbon polymer based formulation, such as atactic polypropylene or other amorphous polyolefin, such as polybutene. The adhesive is preferably one which retains some tack at room temperature and is substantially incurable by means of elevated temperature alone. The adhesive should be hydrophobic and substantially free of hygroscopic ingredients, such that the layer structure is suitable for external use.

The hot melt adhesive may be applied by spraying, for example, largely as described in specification WO91 /00804; however, in a preferred embodiment, the polymer adhesive is spread on one or other of the surfaces to be adhered using a hot blade.

Typically, such a hot blade is at a temperature of about 190°C (for example, 180 to 200°C) such that the polymer contacting the face to which it is applied is at a rt temperature of about 90°C.

The load spreading layer is typically an integral body, which preferably ~" comprises an extruded plastics material such as PVC, polypropylene or the like, which in one embodiment is a unitary sheet member. In a further embodiment, the load spreading layer comprises: (i) a first sheet member bonded to the undersurface of said outer layer; (ii) a second sheet member, spaced from, and substantially parallel to said first sheet member; and (iii) web means arranged to extend between facing surfaces of said sheet members, so as to partition the space between said sheet members into a plurality of chambers.

It is preferred that the web means comprise a plurality of discrete partition walls provided in a substantially vertical alignment relative to facing surfaces of the sheet members. It is further preferred that the partition walls are arranged as a plurality of substantially parallel rows, each row extending between opposed edge regions of the layer structure. The load spreading layer therefore typically comprises a plurality of substantially parallel passages which longitudinally extend between opposed edge regions of the layer structure, so as to provide continuous paths extending longitudinally through the load spreading layer of the structure.

The impact-absorbing foam layer is typically of closed cell foam of, for example, polyethylene. There is preferably at least two (such as three or more) of such impact-absorbing foam layers.

It is further preferred that a flexible foam layer is provided between the outer covering layer and the load spreading layer.

The bonding layer of adhesive (for bonding to a ground surface or the like) preferably provides a "peel and stick" layer where a peelable film layer is arranged to cover the adhesive; the bonding adhesive is preferably a pressure-sensitive material which is applied in a similar manner to the adhesive preferably used for bonding the layers together, as described above. The film part of the "peel and stick" layers is typically of polyethylene or PVC film.

The use of such peel and stick layers enables the layer structure according to the invention to be secured to a ground surface or the like.

A top layer or further layer of bonding adhesive is preferably provided for bonding the outer covering layer to the load spreading sheet layer; the top or further layer of adhesive typically comprises a pressure-sensitive adhesive as described above.

The outer covering of the layer structure typically comprises a known type of rubber crumb surfacing conventionally used in safety flooring. A layer structure comprising an outer rubber crumb surfacing is eminently suitable for outdoor use, such as patio covering, swimming pool surrounds, impact absorbent surfacing for areas such as children's playgrounds, covering for golf driving areas (such as "winter tees"), and playing surfaces for games such as bowls, tennis, cricket, football and the like.

Alternatively, the outer covering layer may comprise a preformed fabric. Tre preformed fabric may be any suitable preformed (self-supporting) textile fabric, such as a tufted or woven fabric, which may be conventional Wilton or Axminster carpeting material. It is a particular advantage of the present invention that when the outer layer is patterned, the layer structures can be laid with good pattern matching between abutting units. The outer layer may have a pile, typically of depth 4 to 13mm.

A layer structure having a preformed fabric outer layer is particularly suitable for use as indoor floor covering and may be in the form of room-filling modules (that is, one such layer structure may cover substantially the entire floor area in a room). The layer structure may be used for other purposes such as, for example, vehicle floor covering or wall covering. Typical indoor floor coverings include coverings for children's play areas, indoor sport areas, or the like.

Typically, a layer structure according to the present invention may be in the form of tiles or other space filling shapes. It is preferred that a layer structure be provided with interlocking means capable of complementarily engaging with interlocking means provided on an adjacent layer structure. Preferred interlocking means comprise male and female engaging means, typically comprising complementarily shaped edge regions of the layer structures.

There is further provided by the present invention, a kit for use in providing a surface covering for an underlying surface, such as a floor area, which kit comprises:

(a) at least one layer structure substantially as hereinbefore described provided with first interlocking means; and

(b) at least one layer structure substantially as hereinbefore described provided with

<--* second interlocking means; wherein the first interlocking means is capable of complementarily engaging with the second interlocking means.

Preferred interlocking means comprise male and female engaging means comprising complementarily shaped edge regions of the layer structures. There is further provided by the present invention a surface covering comprising a plurality of layer structures substantially as hereinbefore described.

There is still further provided by the present invention, an underlying surface (such as a floor area, wall or work surface) provided with layer structure, or surface covering, substantially as hereinbefore described.

The present invention will now be described in more detail with reference to the accompanying drawing (not to scale) in which Figures 1 to 4 are all exemplary layer structures according to the invention.

Referring to Figure 1 , the layer structure comprises a top film 1. an adhesive layer 2, a closed cell foam layer 3. a sheet layer 4 adhered to foam layer 3 by means of a further adhesive layer 5, and two further foam layers 6 and 7. in which layer 6 is bonded to the sheet layer by adhesive layer 8. and foam layers 6 and 7 are bonded to one another by adhesive 9.

The bottom surface of layer 7 is covered by layer of adhesive 10. which is itself covered by a layer of peelable film 1 1. In use. peelable film 11 is removed and the layer structure is adhered to the base of a previously excavated depression or a substantially flat surface: when the layer structure has been secured in place and it is desired to secure a top surfacing layer, the top film is then removed to allow the surfacing to be secured thereto.

Referring to Figure 2. there is shown a layer structure generally designated 21. comprising an outer rubber crumb layer 22, a load spreading layer 23, a foam layer 24 an adhesive layer 25 and film 25a.

Load spreading layer 23, comprises upper and lower sheets 26 and 27 respectively, and walls 28. Walls 28 connect sheets 26 and 27 and, although not shown in Figure 2. extend between opposed edge regions of the sheets 26 and 27. Sheets 26 and 27, and walls 28, typically comprise extruded polypropylene.

A suitable load spreading layer is tlie extruded plastics sheet material commercially available under the trade mark "Correx".

Layer 29 comprises an atactic polypropylene adhesive arranged as a continuous bonding layer between load spreading layer 23 and foam layer 24. Foam layer 24 comprises a closed cell , polyethylene foam.

Adhesive layers 25 respectively provide a bonding layers for outer layer 22 and film 25a. Referring to Figure 3, there is shown a layer structure 30 which is a modification of layer structure 21 shown in Figure 2. Load spreading layer 23 of structure 30 comprises a single sheet of PVC material. PVC layer 23 is bonded to outer crumb surfacing 22 by pressure-sensitive adhesive 25, and to foam layer 24 by hot melt adhesive 29.

Figure 4 shows a layer structure 31 which is a modification of the layer structure 30 shown in Figure 3. Structure 31 comprises a plurality of foam layers 24 bonded to the undersurface of PVC layer 23. Foam layers 24 are bonded together by hot melt adhesive layers 29.

f

Claims

CLATMS:
1. A layer structure suitable for safety floor covering, which comprises, in the order specified, an outer covering layer a non-foamed substantially rigid load spreading sheet layer, and at least one impact absorbing foam layer bonded to the undersurface of said load spreading layer, the surface of the layer structure remote from said load spreading layer being provided with a layer of bonding adhesive suitable for bonding to a ground surface or the like.
2. A layer structure according to claim 1 , wherein a flexible foam layer is provided between said outer covering layer and said load spreading layer.
3. A layer structure according to claim 1 or 2. wherein at least two impact absorbing foam layers are bonded to the undersurface of said load spreading layer.
4. A layer structure according to claim 3, wherein said foam layers are bonded together by a hot melt adhesive or by sintering.
5. A layer structure according to any of claims 1 to 4. wherein the foam layer is bonded to the load spreading layer by a hot melt adhesive.
6. A layer structure according to claim 4 or 5, wherein said hot melt adhesive comprises a thermoplastic synthetic hydrocarbon polymer based formulation.
7. A layer structure according to claim 6. wherein said polymer based formulation comprises atactic polypropylene.
8. A layer structure according to any of claims 4 to 7, wherein said adhesive is spread on one or other of the surfaces to be adhered usins a hot blade.
9. A layer structure according to claim 8, wherein said hot blade is at a temperature in the range of 180 to 200°C such that the polymer contacting the face to which it is applied is at a temperature of about 90°C.
10. A layer structure according to any of claims 1 to 9, wherein load spreading layer comprises PVC or polypropylene.
11. A layer structure according to any of claims 1 to 10, wherein said load spreading layer comprises:
( i) a first sheet member bonded to the undersurface of said covering layer;
( ii) a second sheet member, spaced from, and substantially parallel to said first sheet member; and (iii) web means arranged to extend between facing surfaces of said sheet members, so as to partition the space between said sheet members into a plurality of chambers.
12. A layer structure according to claim 11 , wherein said web means comprise a plurality of discrete partition walls provided in a substantially vertical alignment relative to facing surfaces of the sheet members.
13. A layer structure according to claim 12, wherein said partition walls are arranged as a plurality of substantially parallel rows, each row extending between opposed edge regions of the layer structure.
14. A layer structure according to any of claims 1 to 13. wherein said foam layer is of closed cell foam.
15. A' layer structure according to claim 14. wherein said closed cell foam comprises polyethylene.
16. A layer structure according to any of claims 1 to 15, wherein the outer covering layer is bonded to the load spreading layer by a further layer of bonding adhesive.
17. A layer structure according to any of claims 1 to 16. wherein said bonding adhesive comprise a pressure-sensitive material.
18. A layer structure according to any of claims 1 to 17, wherein a film layer comprising a polyethylene or PVC film, is arranged to cover said bonding adhesive.
19. A layer structure according to any of claims 1 to 18, wherein said outer covering layer comprises a rubber crumb surfacing.
20. A layer structure according to any of claims 1 to 18, wherein said outer covering layer comprises a preformed fabric.
21. A layer structure according to any of claims 1 to 20. which is provided with interlocking means capable of complementarily engaging interlocking means provided on an adjacent layer structure.
22. A layer structure according to claim 21 . wherein said interlocking means comprise male and female engaging means.
23. A layer structure according to claim 21 or 22. wherein said interlocking means comprise complementarily shaped edge regions of the layer structure.
24. A kit for use in providing a surface covering for an underlying surface which kit comprises:
(a) at least one layer structure according to any of claims 21 to 23, provided with first interlocking means: and (b) at least one layer structure according to any of claims 21 to 23 provided with second interlocking means; wherein said first interlocking means is capable of complementarily engaging with said second interlocking means.
25. An underlying surface provided with a layer structure according to any of claims 1 to 23.
PCT/GB1993/000265 1992-02-07 1993-02-08 Layer structure WO1993015905A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB9202626.9 1992-02-07
GB929202626A GB9202626D0 (en) 1992-02-07 1992-02-07 Layer structure
GB9223275.0 1992-11-06
GB929223275A GB9223275D0 (en) 1992-11-06 1992-11-06 Multi-layer structure

Publications (1)

Publication Number Publication Date
WO1993015905A1 true WO1993015905A1 (en) 1993-08-19

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ID=26300288

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/000265 WO1993015905A1 (en) 1992-02-07 1993-02-08 Layer structure

Country Status (1)

Country Link
WO (1) WO1993015905A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2119590A1 (en) * 1994-06-21 1998-10-01 Mencheta Caballero Josep Lluis Sports flooring
FR2761295A1 (en) * 1997-04-01 1998-10-02 Gerflor Sa Composite sheet, floor covering comprising same, and methods of making same
EP1074676A2 (en) * 1999-07-30 2001-02-07 Pemarsa, S.A. Compound floor covering, especially for sports, children and livestock-rearing use, and method for making said floor covering
ES2296508A1 (en) * 2006-03-13 2008-04-16 Caster S.A. Safety-paving for use in parks and recreational facilities for children, comprises base of thick tiles, which has multiple layers of various polymer materials, where tiles include suspension of gas microspheres
WO2016144851A1 (en) * 2015-03-09 2016-09-15 3M Innovative Properties Company Improved floor mats

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1032868A (en) * 1961-12-18 1966-06-15 S E T E P Soc D Etudes De Rech Improvements in or relating to floor and wall lining material and methods of making this material
FR2357276A1 (en) * 1976-07-10 1978-02-03 Freudenberg Carl Mats gymnastics and game
GB2000726A (en) * 1977-07-05 1979-01-17 Freudenberg C Floor coverings for playing surfaces
EP0085196A1 (en) * 1982-01-29 1983-08-10 JANSSEN &amp; FRITSEN B.V. Couplable mat
DE3416644A1 (en) * 1984-05-05 1985-11-14 Peter Masnick Gymnastics mat and floor mat
DE3534165A1 (en) * 1985-09-25 1987-03-26 Balsam Sportstaettenbau Sports hall floor covering
EP0231013A2 (en) * 1986-01-28 1987-08-05 Sekisui Kagaku Kogyo Kabushiki Kaisha Laminated structure for interior finishing materials, and method of production
FR2613947A1 (en) * 1987-04-17 1988-10-21 Promorep Sarl Design of a judo mat
GB2205528A (en) * 1987-06-12 1988-12-14 David Fairbank Laminated structures using amorphous polypropylene as adhesive
US4849269A (en) * 1988-07-15 1989-07-18 Nifty Products, Inc. Subflooring composite
WO1991000805A1 (en) * 1989-07-08 1991-01-24 G.R.F. Sports Services Limited Surface covering material

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1032868A (en) * 1961-12-18 1966-06-15 S E T E P Soc D Etudes De Rech Improvements in or relating to floor and wall lining material and methods of making this material
FR2357276A1 (en) * 1976-07-10 1978-02-03 Freudenberg Carl Mats gymnastics and game
GB2000726A (en) * 1977-07-05 1979-01-17 Freudenberg C Floor coverings for playing surfaces
EP0085196A1 (en) * 1982-01-29 1983-08-10 JANSSEN &amp; FRITSEN B.V. Couplable mat
DE3416644A1 (en) * 1984-05-05 1985-11-14 Peter Masnick Gymnastics mat and floor mat
DE3534165A1 (en) * 1985-09-25 1987-03-26 Balsam Sportstaettenbau Sports hall floor covering
EP0231013A2 (en) * 1986-01-28 1987-08-05 Sekisui Kagaku Kogyo Kabushiki Kaisha Laminated structure for interior finishing materials, and method of production
FR2613947A1 (en) * 1987-04-17 1988-10-21 Promorep Sarl Design of a judo mat
GB2205528A (en) * 1987-06-12 1988-12-14 David Fairbank Laminated structures using amorphous polypropylene as adhesive
US4849269A (en) * 1988-07-15 1989-07-18 Nifty Products, Inc. Subflooring composite
WO1991000805A1 (en) * 1989-07-08 1991-01-24 G.R.F. Sports Services Limited Surface covering material

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2119590A1 (en) * 1994-06-21 1998-10-01 Mencheta Caballero Josep Lluis Sports flooring
FR2761295A1 (en) * 1997-04-01 1998-10-02 Gerflor Sa Composite sheet, floor covering comprising same, and methods of making same
WO1998044187A1 (en) * 1997-04-01 1998-10-08 Gerflor S.A. Composite sheeting, floor covering comprising said sheeting, and corresponding manufacturing processes
GB2338435A (en) * 1997-04-01 1999-12-22 Gerflor Sa Composite sheeting, floor covering comprising said sheeting, and corresponding manufacturing processes
GB2338435B (en) * 1997-04-01 2001-07-18 Gerflor Sa Method of production of a composite plastics sheet
EP1074676A2 (en) * 1999-07-30 2001-02-07 Pemarsa, S.A. Compound floor covering, especially for sports, children and livestock-rearing use, and method for making said floor covering
ES2157814A1 (en) * 1999-07-30 2001-08-16 Pemarsa S A Compound floor covering, especially for sports, children and livestock-rearing use, and method for making said floor covering
EP1074676A3 (en) * 1999-07-30 2003-09-17 Pemarsa, S.A. Compound floor covering, especially for sports, children and livestock-rearing use, and method for making said floor covering
ES2296508A1 (en) * 2006-03-13 2008-04-16 Caster S.A. Safety-paving for use in parks and recreational facilities for children, comprises base of thick tiles, which has multiple layers of various polymer materials, where tiles include suspension of gas microspheres
WO2016144851A1 (en) * 2015-03-09 2016-09-15 3M Innovative Properties Company Improved floor mats

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