Abstract There is disclosed a thermally bonded spunbond web of thermoplastic filaments and a nonwoven fabric laminate comprising an internal layer of meltblown thermoplastic microfibers sandwiched between two layers of spunbond thermoplastic filaments. The spunbond web and the spunbond layers of the fabric laminate consist of thermoplastic filaments which are formed from a mixture of a thermoplastic polymer and an effective amount of a nucleating agent. The layers are bonded by thermal spot bonding. In the preferred embodiment, the thermoplastic polymer is polypropylene with a melt-flow rate of at 230 DEG C. of or greater than 12 grams per ten minutes. Also in the preferred embodiment, the nucleating agent constitutes from about 0.1 to 0.3 percent by weight of the mixture of polypropylene and nucleating agent. The nucleating agents that are useful include dibenzylidene sorbitol, di(methylbenzylidene) sorbitol, bis (p-ethylbenzylidene) sorbitol and hydrophobic, fumed silica having particle sizes up to 1 micron in diameter. The nonwoven laminate is particularly useful in manufacturing work garments and other protective apparel having enhanced durability.
A garment for protecting a worker constructed from a fabric comprising a durable nonwoven laminate comprising at least one spunbond layer comprising thermoplastic filaments formed from a mixture of a thermoplastic polymer and an effective amount of a fumed silica nucleating agent having particles sizes up to 1 micron in diameter and at least one layer of a meltblown web of thermoplastic microfibers, wherein the layers of the laminate are thermally bonded together in discrete areas.
Claim 2
Dependent Claim
76 words
A garment for protecting a worker constructed from a fabric comprising a durable nonwoven laminate comprising at least one spunbond layer comprising thermoplastic filaments formed from a mixture of a thermoplastic polymer and an effective amount of a fumed silica nucleating agent having particles sizes up to 1 micron in diameter and at least one layer of a meltblown web of thermoplastic microfibers, wherein the layers of the laminate are thermally bonded together in discrete areas.
Claim 3
Dependent Claim
18 words
The garment of claim 1, wherein the nucleating agent constitutes 0.1 to 0.3 percent weight of a mixture.
Claim 4
Dependent Claim
21 words
The garment of claim 1, wherein the laminate comprises three layers: one meltblown layer laminated between two of the spunbond layers.
Claim 5
Dependent Claim
22 words
The garment of claim 3, wherein the thermoplastic polymer has a melt flow rate at 230° C. of or greater than 12.
Claim 6
Dependent Claim
34 words
The garment of claim 4, wherein the thermoplastic polymer is selected from the group consisting of polypropylene, polyethylene, and random copolymers based on propylene and ethylene with up to 5% by weight of ethylene.