Polyester heat bonded product
AssigneePellon Corporation
InventorsQuentin L. Kampf, Chester J. Petkiewicz, Gernot K. Buerger
Life of this patent
Estimating the term…
Abstract
Disclosed is a nonwoven fabric which is a nonspunbonded fabric and has a surface free of standing fibers and a method for making the same. The fabric is useful as a support for case on coatings to form a composite for TFC membrane filters. The fabric is formed of a first layer having binder fiber and matrix fiber. A second layer of 100 percent binder fiber is cast thereon. The binder fiber has a softening point lower than the melting point of the matrix fiber. The first and second layers are bonded by heat and pressure to form the fabric.
Claims28
A nonwoven fabric which is not spunbonded comprising:
- a first layer of a thermoplastic binder fiber and a matrix fiber, the matrix fiber being at least one of a second thermoplastic, cotton, wool and regenerated cellulostic fibers and a second layer, the second layer consisting essentially of thermoplastic binder fiber, said binder fiber having a softening point lower than a melting point of said matrix fiber;
- said first and second layers being bonded by heat and pressure to form said fabric, said fabric being free of standing surface fibers.
A composite comprising a support fabric, said fabric being a nonwoven fabric which is not spunbonded comprising:
- a first layer of a thermoplastic binder fiber and a matrix fiber, the matrix fiber being at least one of a second thermoplastic, cotton, wool and regenerated cellulostic fibers, and a second layer, the second layer consisting essentially of thermoplastic binder fiber, said binder fiber having a softening point lower than a melting point of said matrix fiber;
- said first and second layers being bonded by heat and pressure to form said fabric, said fabric being free of standing surface fibers;
- and a coating cast on said support fabric.
A method of forming a nonwoven fabric which is not spunbonded comprising:
- providing a first layer of thermoplastic binder fiber and matrix fiber, the matrix fiber being at least one of a second thermoplastic, cotton, wool and regenerated cellulostic fibers;
- providing on said first layer a second layer consisting essentially of thermoplastic binder fiber, said binder fiber having a softening point lower than a melting point of said matrix fiber;
- and bonding said first and second layers by heat and pressure to form said fabric, said fabric being free of standing surface fibers.
The method of claim,20 wherein the first and second thermoplastics are different polyesters.
The method of claim, 20 wherein the binder fiber is selected from the group consisting of poly(ethylene terephthalate)/poly(ethylene isophthalate), poly(ethylene terephthalate)/polypropylene, poly(ethylene terephthalate)/polyethylene, polypropylene/polyethylene, copolyesters, and undrawn polyester.
Dependencies are inferred from the claim text.