Cigarette burn proof artificial grass

It is well known that all types of artificial grass manufacturer or turf made of conventional synthetic fibers such as polypropylene and nylon are readily disfigured by burning cigarettes which are all too often dropped on them by careless smokers. Cigaretteburn scars are often seen on the surfaces of artificial grass manufacturer or turf that cover the entrances to hotels, motels, office buildings, and patios. The problem involves the thermoplastic nature of the synthetic fibers (slit or split film inclined) used inthe construction of the artificial grass pile and the continuous burning characteristics of cigarettes (additives, such as potassium nitrate, are added to cigarette tobacco
to prevent self extinguishing).
A cigarette burn proof artificial grass manufacturer product, comprising: a pile fabric with twisted yarn comprised of a plurality of fibers made of an ethylene-vinyl acetate copolymer andhaving an elastic modulus of from 25,000 p.s.i. to 100,000 p.s.i. and a moment of inertia of from 1.06×10-10  in.4 to 8.33×10-9 in.4, the fibers extending from and substantially perpendicular to a backing to which thefibers are secured, wherein the yarn is twisted at the part of emergence from the backing, and wherein the copolymer is cross-linked by exposure to an effective amount of ionizing radiation to achieve a gel content of from about 25 to 75 percent.
A further object of this invention is to provide an artificial grass manufacturer product having fibers with a modulus of elasticity and an area moment of inertia closely approximating those properties of blades of Kentucky Blue Grass.Still another object of the present invention is to provide an artificial grass product having superior ultraviolet stability and weathering resistance in the absence or presence of an ultraviolet stabilizer or antioxidant.
The fibers of the artificial grass manufacturer products of the invention closely simulate blades of Kentucky Blue Grass with respect to breaking load, ultimate tensile strength and elastic modulus. A turf product made with these fibers provides a surfacemore closely resembling natural grass than any conventional artificial grass manufacturer product.