# US 11,441,275 B2 · Safety surface materials

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,441,275 B2
- Document ID: US11441275B2
- Status: Granted
- Kind: B2
- Application number: 16/133,878
- Filed: 2018-09-18
- Published: 2020-03-19
- Granted: 2022-09-13
- Earliest claimed: 2016-02-01
- Applicants: William H. McGrath, Jr.
- Inventors: William H. McGrath, Jr.
- Web page: https://patentgrep.com/patent/US11441275B2

## CPC

- E01C 13/02: Foundations, e.g. with drainage or heating arrangements {(E01C13/003, E01C13/083, E01C13/10 take precedence; drainage of soil E02B11/00)}
- E01C 13/065: {at least one in situ layer consisting of or including bitumen, rubber or plastics}
- B32B 5/16: characterised by features of a layer formed of particles, e.g. chips, powder {or granules (layer formed of natural mineral particles B32B19/00; layer being formed of wood fibres, chips or particles B32B21/02)}
- B32B 5/18: characterised by features of a layer {of} foamed material
- B32B 25/08: of synthetic resin
- B32B 27/065: {of foam}
- B32B 27/14: next to a particulate layer
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- E01C 11/24: Methods or arrangements for preventing slipperiness or protecting against influences of the weather {(measures taken in connection with the foundation E01C3/06; paving elements with anti-slip inlays E01C5/22; aggregates resisting to grinding E01C7/085, E01C7/142, E01C7/182; specially for surface layers E01C7/35; reinforcements extending up to the surface E01C11/16, E01C11/18, E01C11/185; drainage E01C11/22; windscreens E01F7/02; snow fences E01F7/02; combating fog E01H13/00)}
- E01C 13/06: Pavings made in situ, {e.g. for sand grounds, clay courts E01C13/003}, (E01C13/08, E01C13/10 take precedence)
- E01C 13/08: Surfaces simulating grass {; Grass-grown sports grounds (grass-like surfaces for skiing E01C13/12)}
- B32B 2264/0257: Polyolefin particles, e.g. polyethylene or polypropylene homopolymers or ethylene-propylene copolymers
- B32B 2305/022: Foam
- B32B 2307/51: Elastic
- B32B 2307/542: Shear strength
- B32B 2307/554: Wear resistance
- B32B 2307/71: Resistive to light or to UV
- B32B 2307/712: Weather resistant
- B32B 2307/714: Inert, i.e. inert to chemical degradation, corrosion
- B32B 2307/718: Weight, e.g. weight per square meter
- B32B 2307/734: Dimensional stability
- B32B 2307/744: Non-slip, anti-slip
- E01C: CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR (forming roads or like surfaces by compacting or grading snow or ice E01H)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

A safety surface material for a playground facility employing a monolithically mixed and troweled Thermoplastic Olefin (TPO) polypropylene/polyurethane cushion course base layer—which, for water park/spray park use is overlain by a Thermoplastic Rubber wear course top.

## Claims

### Claim 1

A recreational facility surfacing material comprising:
a cushion course base layer of foam polypropylene granules within an outer skin layer of non-foamed polypropylene in a mixture with Methylene Diphenyl Diisocyanate (MDI) urethane binder or Hexamethylene Diisocyanate (HDI) urethane binder; and
a wear course top layer of granulated or round Thermoplastic Rubber (TPR), Ethylene Polypropylene Diene Monomer Rubber (EPDM), or Thermoplastic Vulcanized Rubber (TPV) mixed with one of a Methylene Diphenyl Diisocyanate and Hexamethylene Diisocyanate urethane binder overlying said cushion course base layer.

### Claim 2 (depends on 1)

The surfacing material of claim 1 wherein the wear course top layer comprises 20% urethane binder by weight.

### Claim 3 (depends on 1)

The surfacing material of claim 1 wherein the cushion course base layer comprises 30% urethane binder by weight.

### Claim 4 (depends on 1)

The surfacing material of claim 1 wherein said cushion course base layer is of a thickness of 2½″ to 4″.

### Claim 5 (depends on 1)

The surfacing material of claim 1 wherein said wear course top layer is of a thickness of ⅜″ to ½″.

### Claim 6 (depends on 1)

A seamless surface comprising the surfacing material of claim 1.

### Claim 7 (depends on 1)

The surfacing material of claim 1, further comprising a synthetic turf.

### Claim 8 (depends on 1)

The surfacing material of claim 1, wherein the cushion course base layer is comprised of 1 to 3 mm granules.

### Claim 9 (depends on 1)

The surfacing material of claim 1, wherein the cushion course base layer is comprised of 1.3 mm to 1.5 mm granules.

### Claim 10

A recreational facility surfacing material comprising:
a cushion course base layer of foam urethane granules within an outer skin layer of non-foamed urethane in a mixture with Methylene Diphenyl Diisocyanate (MDI) urethane binder or Hexamethylene Diisocyanate (HDI) urethane binder; and
a wear course top layer of granulated or round Thermoplastic Rubber (TPR), Ethylene Polypropylene Diene Monomer Rubber (EPDM), or Thermoplastic Vulcanized Rubber (TPV) mixed with one of a Methylene Diphenyl Diisocyanate and Hexamethylene Diisocyanate urethane binder overlying said cushion course base layer.

### Claim 11

A recreational facility surfacing material comprising:
a cushion course base layer of foam thermoplastic olefin granules within an outer skin layer of non-foamed thermoplastic olefin in a mixture with Methylene Diphenyl Diisocyanate (MDI) urethane binder or Hexamethylene Diisocyanate (HDI) urethane binder; and
a wear course top layer of granulated or round Thermoplastic Rubber (TPR), Ethylene Polypropylene Diene Monomer Rubber (EPDM), or Thermoplastic Vulcanized Rubber (TPV) mixed with one of a Methylene Diphenyl Diisocyanate and Hexamethylene Diisocyanate urethane binder overlying said cushion course base layer.

### Claim 12 (depends on 11)

The surfacing material of claim 11, wherein the foam thermoplastic olefin granules within an outer skin layer of non-foamed thermoplastic olefin are foam polyethylene granules within an outer skin layer of non-foamed polyethylene.