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US 5,286,770 AGranted
Disposable absorbent articles
AssigneeNovamont S.p.A.
InventorsCatia Bastioli, Vittorio Bellotti, Giancarlo Romano
Life of this patent
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Abstract
An absorbent article, such as diapers and the like, comprises a liquid pervious topsheet, a liquid impervious backsheet joined with said topsheet and an absorbent core positioned between said topsheet and said backsheet, said backsheet comprising a flexible starch based film comprising starch, a synthetic thermoplastic polymer of at least one ethylenically insaturated monomer, said polymer having repeating units provided with at least a polar group, wherein the starch and the polymer form an at least partially interpenetrated network, and moisture.
Claims16
An absorbent article comprising:
- (a) a liquid pervious topsheet;
- (b) a liquid impervious backsheet joined to the topsheet, wherein the backsheet comprises a flexible starch-based film comprising:
- (i) starch;
- (ii) at least one synthetic thermoplastic polymer selected from the group consisting of
- (aa) polyvinyl alcohol;
- (bb) copolymers of an olefin selected from the group consisting of ethylene, propylene, isobutene, styrene and combinations thereof with acrylic acid, vinyl alcohol, vinyl acetate, and combinations thereof;
- and (cc) combinations thereof;
- (iii) from 0.5 to 20 weight percent urea based on the total weight of the film;
- (iv) moisture;
- and
- (v) 5-25 percent plasticizer by weight based on the total weight of the film, wherein the plasticizer is selected from the group consisting of mono-ethoxylate, di-ethoxylate, mono-propoxylate, di-propoxylate, mono-acetate derivatives of sorbitol, di-acetate derivatives of sorbitol, and combinations thereof;
- wherein the (i) starch and the (ii) at least one polymer form an at least partially interpenetrated network;
- and
- (c) an absorbent core positioned between the topsheet and the backsheet.
11 more elements
An absorbent article comprising:
- (a) a liquid pervious topsheet;
- (b) a liquid impervious backsheet joined to the topsheet, wherein the backsheet comprises a laminated film comprising a first layer of a starch-based film and a second layer consisting essentially of a polymeric coating of polyparaxylylene and/or substitution derivatives thereof, wherein the first layer and the second layer adhere to each other;
- and
- (c) an absorbent core positioned between the topsheet and the backsheet.
1 more element
An absorbent article comprising:
- (a) a liquid pervious topsheet;
- (b) a liquid impervious backsheet joined to the topsheet, wherein the backsheet comprises a flexible starch-based film comprising:
- (i) starch;
- (ii) at least one synthetic thermoplastic polymer derived from at least one ethylenically unsaturated monomer, wherein the polymer has repeating units having at least one polar group;
- (iii) a high boiling point plasticizer selected from the group consisting of monoethoxylate;
- di-ethoxylate;
- mono-propoxylate;
- di-propoxylate;
- mono- and di-acetate derivatives of a polyol selected from the group consisting of sorbitol, xylitol, mannitol, iditol, galactitol, adonitol, arabitol, erythritol, pentaerythritol, and combinations thereof;
- and combinations thereof;
- and
- (iv) moisture;
- wherein the (i) starch and the (ii) at least one polymer form an at least partially interpenetrated network;
- and
- (c) an absorbent core positioned between the topsheet and the backsheet.
12 more elements
An absorbent article comprising:
- (a) a liquid pervious topsheet;
- (b) a liquid impervious backsheet joined to the topsheet, wherein the backsheet comprises a flexible starch-based film comprising:
- (i) starch;
- (ii) polyethylene-vinyl alcohol and an aliphatic polyester;
- (iii) from 0.5 to 20 weight percent urea based on the total weight of the film;
- and
- (iv) moisture;
- wherein the (i) starch and the (ii) at least one polymer form an at least partially interpenetrated network;
- and
- (c) an absorbent core positioned between the topsheet and the backsheet.
7 more elements
An absorbent article comprising:
- (a) a liquid pervious topsheet;
- (b) a liquid impervious backsheet joined to the topsheet, wherein the backsheet comprises a flexible starch-based film comprising:
- (i) starch;
- (ii) polyethylene-vinyl alcohol and an aliphatic polyester;
- (iii) from 0.5 to 20 weight percent urea based on the total weight of the film;
- (iv) moisture;
- and
- (v) 1-50 percent by weight plasticizer based on the total weight of the film, wherein the plasticizer is selected from the group consisting of (aa) polyols having 1-20 repeating hydroxylated units wherein each unit has 2-6 carbon atoms;
- (bb) ethers, thioethers, inorganic esters, organic esters, acetals and/or amino-derivatives of polyols having 1-20 repeating hydroxylated units wherein each unit has 2-6 carbon atoms;
- (cc) polyol reaction products having 1-20 repeating hydroxylated units wherein each unit has from 2-6 carbon atoms with chain extenders;
- (dd) polyol oxidation products comprising 1-20 repeating hydroxylated units wherein each unit has 2-6 carbon atoms, and wherein the polyol oxidation products comprise at least one aldehydic and/or carboxylic functional group that is obtained by reacting polyols with periodic acid, hypochlorite and/or lead tetraacetate;
- and (ee) combinations thereof;
- wherein the (i) starch and the (ii) at least one polymer form an at least partially interpenetrated network;
- and
- (c) an absorbent core positioned between the topsheet and the backsheet.
12 more elements
An absorbent article comprising:
- (a) a liquid pervious topsheet;
- (b) a liquid impervious backsheet joined to the topsheet, wherein the backsheet comprises a flexible starchbased film comprising:
- (i) starch;
- (ii) at least one synthetic thermoplastic polymer derived from at least one ethylenically unsaturated monomer, wherein the polymer has repeating units having at least one polar group;
- (iii) from 0.5 to 20 weight percent urea based on the total weight of the film;
- (iv) moisture;
- and
- (v) 1-50 percent by weight plasticizer based on the total weight of the film wherein the plasticizer is selected from the group consisting of mono-ethoxylate;
- di-ethoxylate;
- mono-propoxylate;
- di-propoxylate;
- mono-acetate derivatives of a polyol;
- di-acetate derivatives of a polyol;
- and combinations thereof;
- wherein the polyol is selected from the group consisting of sorbitol;
- xylitol;
- mannitol;
- iditol;
- galactitol;
- adonitol;
- arabitol;
- erythritol;
- pentaerythritol;
- trimethylolpropane;
- and combinations thereof;
- wherein the (i) starch and the (ii) at least one polymer form an at least partially interpenetrated network;
- and
- (c) an absorbent core positioned between the topsheet and the backsheet.
25 more elements
Dependencies are inferred from the claim text.