Patent US3420672A successfully refreshed from Google Patents.
US5545472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-borne, water redispersible, laminating adhesives for nonwoven applications
Assignee: National Starch and Chemical Investment Holding Corp
•
Filing: 1995-02-22
•
Granted: 1996-08-13
•
Expires: 2015-02-22
Abstract
Abstract A specific class of water-borne, water redispersible laminating adhesives is disclosed which is desirable for bonding nonwoven substrates to themselves or to other substrates. The adhesives provide improved bond strength and improved water redispersibility when compared to laminating adhesives currently used for the same purpose. Furthermore, the novel adhesives are much less sensitive to the presence of significant levels of plasticizer than are laminating adhesives currently used, which exhibit reduced water redispersibility when such plasticizers are present in significant amounts. The novel laminating adhesives contain an aqueous styrene/acrylic polymer dispersion prepared by radical-initiated emulsion polymerization of unsaturated monomers in the presence of starch degradation products having a weight average molecular weight range of from about 2500 to 25000 and which are obtainable by hydrolysis in the aqueous phase. The adhesives may contain only the starch-modified, styrene/acrylic polymer dispersion, or may further include other components, such as plasticizers and/or rheology modifiers, when required. The novel adhesives are particularly useful in disposable articles wherein a nonwoven substrate is bonded to a second substrate via a water-borne, laminating adhesive. The disposable articles may include an absorbent core portion disposed between and proximate the nonwoven and second substrate.
Inventors
- 👤 Timothy C. Koubek
- 👤 Paul P. Puletti
- 👤 Joseph Wieczorek, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:22
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/58; B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; A61L15/62; B32B5/02; B32B5/022; B32B7/00; B32B7/04; B32B7/12; C; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/101; C08K5/103; C09; C09J; C09J133/00; C09J133/04; C09J133/06; C09J151/00; C09J151/08; D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/587; D04H1/64; D06; D06M; D06M15/00; D06M15/01; D06M15/03; D06M15/11; D06M15/19; D06M15/21; D06M15/227; D06M15/233; D06M15/263; D06M17/00; D06M17/04; D06M17/06; B32B2262/00; B32B2262/02; B32B2262/0253; B32B2307/00; B32B2307/70; B32B2307/728; B32B2405/00; C08L; C08L2666/00; C08L2666/02; C08L2666/26; C08L2666/28; C08L3/00; C08L3/02; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2852; Y10T442/00; Y10T442/60; Y10T442/659; Y10T442/664; Y10T442/668; Y10T442/671; Y10T442/673
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
125 words
A disposable, absorbent article of manufacture, comprising: a first nonwoven substrate bonded to a second substrate via a water-borne, water redispersible laminating adhesive, said laminating adhesive comprising an aqueous polymer dispersion prepared by radical-initiated emulsion polymerization of a mixture of unsaturated monomers in the presence of starch degradation products having a weight average molecular weight range of from 2500 to 25,000 and which are obtainable by hydrolysis in an aqueous phase; and 2 to 30 weight percent of a plasticizer, wherein the first nonwoven substrate and the second substrate comprises polymeric materials selected from the group consisting of natural and synthetic polymeric materials and wherein, at a water-temperature of greater than about 15° C., the adhesive exhibits water redispersibility of at least about 90 percent.
Claim 2
Dependent Claim
125 words
A disposable, absorbent article of manufacture, comprising: a first nonwoven substrate bonded to a second substrate via a water-borne, water redispersible laminating adhesive, said laminating adhesive comprising an aqueous polymer dispersion prepared by radical-initiated emulsion polymerization of a mixture of unsaturated monomers in the presence of starch degradation products having a weight average molecular weight range of from 2500 to 25,000 and which are obtainable by hydrolysis in an aqueous phase; and 2 to 30 weight percent of a plasticizer, wherein the first nonwoven substrate and the second substrate comprises polymeric materials selected from the group consisting of natural and synthetic polymeric materials and wherein, at a water-temperature of greater than about 15° C., the adhesive exhibits water redispersibility of at least about 90 percent.
Claim 3
Dependent Claim
136 words
A disposable, absorbent article of manufacture, comprising: a first nonwoven substrate bonded to a second substrate via a water-borne, water redispersible laminating adhesive, said laminating adhesive comprising an aqueous polymer dispersion prepared by radical-initiated emulsion polymerization of a mixture of unsaturated monomers in the presence of starch degradation products having a weight average molecular weight range of from 2500 to 25,000 and which are obtainable by hydrolysis in an aqueous phase; and 2 to 30 weight percent of a plasticizer selected from the group consisting of acetyl tributyl citrate, butyl benzyl phthalate, butyl phthalyl butyl glycolate, dibutyl phthalate, dibutyl sebacate, diethyl phthalate, diethylene glycol dibenzoate, dipropylene glycol, dipropylene glycol dibenzoate, ethyl phthalyl ethyl glycolate, ethyl-p-toluene sulfonamide, hexylene glycol, methyl phthalyl ethyl glycolate, polyoxyethylene aryl ester, tributoxyethyl phthalate, triethylene glycol polyester of benzoic acid and phthalic acid.
Claim 4
Dependent Claim
136 words
A disposable, absorbent article of manufacture, comprising: a first nonwoven substrate bonded to a second substrate via a water-borne, water redispersible laminating adhesive, said laminating adhesive comprising an aqueous polymer dispersion prepared by radical-initiated emulsion polymerization of a mixture of unsaturated monomers in the presence of starch degradation products having a weight average molecular weight range of from 2500 to 25,000 and which are obtainable by hydrolysis in an aqueous phase; and 2 to 30 weight percent of a plasticizer selected from the group consisting of acetyl tributyl citrate, butyl benzyl phthalate, butyl phthalyl butyl glycolate, dibutyl phthalate, dibutyl sebacate, diethyl phthalate, diethylene glycol dibenzoate, dipropylene glycol, dipropylene glycol dibenzoate, ethyl phthalyl ethyl glycolate, ethyl-p-toluene sulfonamide, hexylene glycol, methyl phthalyl ethyl glycolate, polyoxyethylene aryl ester, tributoxyethyl phthalate, triethylene glycol polyester of benzoic acid and phthalic acid.
Claim 5
Dependent Claim
28 words
The article of claim 1 or 2 wherein the second substrate is a nonwoven substrate which is compositionally the same as or different than the first nonwoven substrate.
Claim 6
Dependent Claim
17 words
The article of claim 3 wherein the first nonwoven substrate and the second nonwoven substrate comprise tissue.
Claim 7
Dependent Claim
9 words
The article of claim 4 comprising a multi-ply tissue.
Claim 8
Dependent Claim
25 words
The article of claim 1 or 2 further comprising an absorbent core portion disposed between and proximate the first nonwoven substrate and the second substrate.
Claim 9
Dependent Claim
9 words
The article of claim 6 comprising a disposable diaper.
Claim 10
Dependent Claim
20 words
The article of claim 6 wherein the absorbent core portion comprises particulate absorbent material adhered together by the laminating adhesive.
Claim 11
Dependent Claim
17 words
The article of claim 1 or 2 wherein the first nonwoven substrate comprises an absorbent core portion.
Claim 12
Dependent Claim
20 words
The article of claim 9 wherein the absorbent core portion comprises particulate absorbent material adhered together by the laminating adhesive.
References Cited (Backward Citations)
US5217798A
Cited
CA2079726A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-08-13 | 2000-02-12 | 2000-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-13 | 2004-02-12 | 2004-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-13 | 2008-02-12 | 2008-08-13 | $7700.00 | Window Closed / Lapsed |