Fabric (woven – knitted – or nonwoven textile or cloth – etc.) – Nonwoven fabric – Nonwoven fabric with a preformed polymeric film or sheet
Reexamination Certificate
1999-02-08
2001-08-07
Cole, Elizabeth M. (Department: 1771)
Fabric (woven, knitted, or nonwoven textile or cloth, etc.)
Nonwoven fabric
Nonwoven fabric with a preformed polymeric film or sheet
C442S361000, C442S364000, C442S394000
Reexamination Certificate
active
06271155
ABSTRACT:
TECHNICAL FIELD
The invention relates to a composite sheet comprising a film and non-woven fabric having softness and an excellent touch (hereinafter, a laminated non-woven fabric sheet will be used for an abbreviation). More particularly, it relates to a laminated non-woven fabric sheet combining a non-woven fabric and a film, which is useful for water-proof substrates (water impermeable substrates) of paper diapers, sanitary napkins or the like.
BACKGROUND ART
Hitherto, films comprising a thermoplastic resin have been used as water-proof substrates of paper diapers, sanitary napkins or the like. However, in a case where thermoplastic resin films are used for the above mentioned water-proof substrates, there are some problems. In other words, such water-proof substrates give a cool touch to users' skin; are not cloth-like in appearance due to glistening, so that they do not look like high quality products; and do not have a good touch. In order to solve the above mentioned problems, that is, to provide a high quality cloth-like appearance, and soft and warm touch, various kinds of non-woven fabrics are laminated by adhering to a plastic film by the use of hot melt resin or the like. In order to laminate non-woven fabrics by the use of a hot melt resin, an apparatus for spraying a hot melt resin, a hot melt type adhesive comprising a low temperature melting resin that does not cause thermal damage to a film and a non-woven fabric are required, thus increasing the weight and the cost of the products. Moreover, a large area for adhering is required to ensure an excellent adhesion between a film and a non-woven fabric, so that it is difficult to apply hot melt resins as an adhesive agent inconspicuously and uniformly.
The object of the present invention is to solve the above mentioned problems and to provide a composite sheet comprising a non-woven fabric and a film (a laminated non-woven fabric sheet), which is suitable for a water-proof sheet of, for example, paper diapers or sanitary napkins, where a film and a non-woven fabric are adhered without using a specific adhesive such as a hot melt type adhesive or the like, so that the appearance is excellent, and a non-woven fabric and a film are easily and tightly bonded.
DISCLOSURE OF INVENTION
The laminated non-woven fabric sheet of the present invention is a composite sheet comprising a thermoplastic crystalline film and a non-woven fabric comprising thermoplastic conjugated fibers, wherein the thermoplastic conjugated fiber comprise a low melting point component and a high melting point component, and the difference in the melting points between the low melting point component and the high melting point component is not less than 10° C.; the difference in the melting point between the thermoplastic crystalline film and the low melting point component of the conjugated fiber is not more than 30° C.; and the temperature of the position corresponding to 10% of the area from the side of the melting starting point of the endothermic peak of an entire conjugated fiber evaluated by DSC is between the melting starting point and the melting completing point of the endothermic peak of the film evaluated by DSC.
It is preferable in the laminated non-woven fabric sheet of the present invention that an endothermic peak of the thermoplastic conjugated fiber of an entire conjugated fiber evaluated by DSC is separated into an endothermic peak of a low melting point component and an endothermic peak of a high melting point component with respect to the base line of the endothermic peak curve, and the temperature of the position corresponding to 20% of the area from the side of the melting starting point of the endothermic peak of the low melting point component of the conjugated fiber is between the melting starting point and the melting completing point of the endothermic curve of the thermoplastic crystalline film evaluated by DSC.
It is further preferable in the laminated non-woven fabric sheet of the present invention that the thermoplastic crystalline film has an air permeability and is one selected from the group consisting of a linear low density polyethylene film and a polypropylene film.
It is further preferable in the laminated non-woven fabric sheet of the present invention that a material of the thermoplastic crystalline film and a material of the low melting point component of the thermoplastic conjugated fiber are made of materials of the same group, and the difference in the melting points between the thermoplastic crystalline film and the low melting point component of the conjugated fiber is not more than 5° C.
It is further preferable in the laminated non-woven fabric sheet of the present invention that the melting point of the low melting point component of the thermoplastic conjugated fiber is lower than the melting point of the thermoplastic crystalline film.
It is further preferable in the laminated non-woven fabric sheet of the present invention that the low melting point component of the thermoplastic conjugated fiber is at least one selected from the group consisting of linear low density polyethylene, olefin binary copolymer and olefin terpolymer.
It is further preferable in the laminated non-woven fabric sheet of the present invention that the olefin binary copolymer is an ethylene-propylene copolymer comprising 85 to 99 wt. % of propylene and 1 to 15 wt. % of ethylene.
It is further preferable in the laminated non-woven fabric sheet of the present invention that the olefin binary copolymer is a butene-propylene copolymer comprising 50 to 99 wt. % of propylene and 1 to 50 wt. % of 1-butene.
It is further preferable in the laminated non-woven fabric sheet of the present invention that the olefin binary copolymer is an ethylene-octene copolymer comprising 73 to 99 wt. % of ethylene and 1 to 27 wt. % of 1-octene.
It is further preferable in the laminated non-woven fabric sheet of the present invention that the olefin terpolymer is an ethylene-butene-propylene terpolymer comprising 84 to 97 wt. % of propylene, 1 to 15 wt. % of 1-butene and 1 to 10 wt. % of ethylene.
It is further preferable in the laminated non-woven fabric sheet of the present invention that the thermoplastic crystalline film and the non-woven fabric are laminated by a thermal adhesion bonding.
It is further preferable in the laminated non-woven fabric sheet of the present invention that the thermoplastic conjugated fiber which constitutes the non-woven fabric is a thermoplastic conjugated fiber comprising filaments.
REFERENCES:
patent: 4522203 (1985-06-01), Mays
patent: 5534339 (1996-07-01), Stokes
patent: 1200697A (1998-12-01), None
patent: 1209170A (1999-02-01), None
patent: 42 34 816 C1 (1993-10-01), None
patent: 0 586 937 (1994-03-01), None
patent: 0 586 936 (1994-03-01), None
patent: 0 604 736 (1994-07-01), None
patent: 2 300 595 (1996-11-01), None
patent: 59-149903 (1984-10-01), None
patent: 7-276573 (1995-10-01), None
patent: WO 96/40513 (1996-12-01), None
patent: WO 97/09173 (1997-03-01), None
patent: WO 97/23676 (1997-07-01), None
PCT Application, China 97197494.2, Aug. 11, 2000.
Horiuchi Shingo
Noma Takeshi
Tsujiyama Yoshimi
Chisso Corporation
Cole Elizabeth M.
Guarriello John J.
Merchant & Gould P.C.
LandOfFree
Composite sheet comprising a non-woven fabric and a film does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Composite sheet comprising a non-woven fabric and a film, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Composite sheet comprising a non-woven fabric and a film will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2439037