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US 5,167,652 AGranted
Moisture sensitive film
AssigneeW. R. Grace & Co.-Conn.
InventorWalter B. Mueller
Life of this patent
Estimating the term…
Abstract
A moisture sensitive film is produced by blending a copolyester with a moisture absorbing copolyamide, and extruding the blend either as a mono layer or multi layer construction. The blend material turns white when wetted. The invention has particular application in disposable diapers where a visual indication of wetness is desired.
Claims2
A thermoplastic film comprising:
- (a) a core layer of ethylene vinyl alcohol copolymer;
- (b) a first outer layer of a copolyester;
- (c) a second outer layer of a blend of a copolyester and a moisture absorbing copolyamide;
- and
- (d) a polymeric adhesive disposed between and bonding the core layer to the first outer layer, and the core layer to the second outer layer, respectively.
2 more elements
A disposable diaper having an outermost layer comprising a blend of between 5% and 50% by weight of a copolyester and 95% and 50% by weight of a moisture absorbing copolyamide;
- an intermediate layer comprising an absorbant material;
- and an inner sheet comprising a moisture permeable or perforated material.
Dependencies are inferred from the claim text.