Froth and durable foam of dispersed olefin polymers, methods of making foam and articles prepared from same
Aqueous-based, dispersed olefin polymers, froths, durable, open-cell foam compositions, structures and articles derived from same; methods for preparation of such froths and foams; and use of the dry durable foams in various applications are disclosed. Further described is use of the foams and structures and articles made of same in absorption, filtration, insulation, cushioning and backing applications, and in particular for odor removal, hygiene and medical applications due to, among other properties, good absorption capabilities, softness and/or flexibility of the foams and their recyclable nature.
1. A stable, aqueous froth consisting essentially of the reaction product of: a) one or more copolymers or interpolymers of ethylene and/or 1-propene with or without other monomers selected from C 4 to C 10 olefins and having an ethylene or 1-propene content from about 2-98 weight percent;
b) water; c) a frothing surfactant; and d) a gas; where the components comprise about: a) 35 to 75 percent, b) 35 to 75 percent and c) 1 to 6 percent of the combined weight of a), b) and c), and d) is present in an amount such that d) comprises at least 80 percent of the total volume of all components present in the froth.
2. The froth of claim 1 which further comprises component e) a foam stabilizer selected from: alkylcellulose ethers, hydroxyalkyl cellulose ethers, hydroxyalkyl alkylcellulose ethers, guar gum, xanthan gum, and polyoxyethylene resins of at least 20,000 molecular weight, said component e) present in the amount of from about 0.05 to about 2 percent based on the dry weight of component a) polymer.
3. The froth of claim 1 where component a) is a copolymer of ethylene with an alpha-olefin comonomer of from 3 to 10 carbon atoms.
4. The froth of claim 3 where the alpha-olefin comonomer is selected from 1-propene, 1-butene, 1-hexene and 1-octene and component a) has a melt index between about 0.5 and about 30 g/10 mm as determined by ASTM D1238 (condition 190 deg C./2.16 kg).
5. An absorbent article selected from a baby diaper, a feminine hygiene product, an adult incontinence hygiene product, a wound dressing pad, a surgical sponge, a food packaging pad, a wiping towel and a wiping sponge, where the article comprises a component made from any one of the froths of claims 1 , 2 , 3 , and 4 .
6. A laminate comprising at least one layer of the froth of any one of claims 1 - 4 , and at least one substrate layer on which the said froth layer is laid, doctored or spread.
7. A laminate of claim 6 wherein the at least one substrate layer is prepared from a layer of a second froth, a preformed open-cell foam, a thermoplastic sheet or film, a woven or non-woven fabric, or melt spun-bonded or melt-blown material.
8. A laminated structure of claim 6 wherein the at least one substrate layer is selected from a layer of a second open-cell foam, a thermoplastic sheet or film, a woven or non-woven fabric, or melt spun-bonded or melt-blown material.
9. An absorbent article selected from a baby diaper, a feminine hygiene product, an adult incontinence hygiene product, a wound dressing pad, a surgical sponge, a medical garment, a surgical drapery, a wiping towel, a wiping sponge and a food packaging pad, wherein the article comprises a component made from the laminated structure of claim 8 .