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US 4,906,495 AGranted
Laminated articles
AssigneeW. R. Grace & Co.
InventorsFrancesco Martini, Luigi Perazzo
Life of this patent
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Abstract
Laminated sheet material 9 comprises a laminate of a polyvinyl alcohol or other water-disintegratable film 12 with a thin coextruded film comprising a melt-bondable layer 15 and an impermeable layer 14. The laminate is odor impermeable but water disposable and so can be used to form a toilet-disposable ostomy bag by melt-sealing around the edges 10 between the facing melt-sealable surfaces 15.
Claims9
A laminate comprising:
- (a) a water-disintegratable film having a thickness of between about 30 and 80 microns, and selected from the group consisting of polyvinyl alcohol and polyethylene oxide,
- (b) a coextruded film of at least two layers, adhered to a first surface of the water-disintegratable film, comprising:
- (i) an oxygen impermeable layer having a thickness of between about 4 and 15 microns and selected from the group consisting of ethylene vinyl alcohol copolymer, vinylidene chloride polymer, and vinylidene chloride copolymer, and
- (ii) a melt-bondable ethylene copolymer layer having a thickness of between about 2 and 15 microns;
- the oxygen impermeable layer being adhered to the first surface of the water-disintegratable film;
- and
- (c) a water-insoluble layer on the side of the water-disintegratable film distant from the coextruded film, the water-insoluble layer selected from the group consisting of polymers of hydroxy butyric acid, polymers of hydroxy butyric acid and hydroxy valeric acid, and cellulosic non-woven fabric.
4 more elements
Dependencies are inferred from the claim text.