Patent US4535013A successfully refreshed from Google Patents.
US4535013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Addition of resins to latex bonded nonwoven fabrics for improved strength
Assignee: Hercules LLC
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Filing: 1983-08-15
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Granted: 1985-08-13
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Expires: 2003-08-15
Abstract
Abstract A low temperature binder systen for non-woven polyolefin fabrics and corresponding method for increasing multidirectional web strength thereof whereby the corresponding fiber web is contacted by a system comprised of a copolymer or terpolymer modified with an active amount of a resin ester component of limited abietic acid concentration, of a hydrogenated resin and a glycerol or pentaerythritol, the latter having a specified softening point and molecular weight range.
Inventors
- 👤 Beryl M. Kuhn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:33
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/64; D04H1/587; Y; Y10; Y10T; Y10T442/00; Y10T442/20; Y10T442/2861; Y10T442/291
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
120 words
A low temperature binder system for non-woven polyolefin fabric consisting essentially of (A) essentially noncrosslinkable non-crystalline polymer of at least one component selected from the group consisting of (a) ethylene/acrylic acid, (b) styrene/butylacrylate, (c) ethylene/vinylacetate, and (d) at least one of (a), (b) or (c) in combination with an effective amount up to about 10 weight percent of acrylic or methacrylic acid; with (B) about 5-35 weight percent, based on total binder solids, of a rosin ester component of at least partially hydrogenated rosin with a polyhydric alcohol, the rosin ester component having an abietic acid concentration not exceeding about 2 weight percent, a drop softening point above about 70° C., and an average molecular weight not exceeding about 2,000.
Claim 2
Dependent Claim
120 words
A low temperature binder system for non-woven polyolefin fabric consisting essentially of (A) essentially noncrosslinkable non-crystalline polymer of at least one component selected from the group consisting of (a) ethylene/acrylic acid, (b) styrene/butylacrylate, (c) ethylene/vinylacetate, and (d) at least one of (a), (b) or (c) in combination with an effective amount up to about 10 weight percent of acrylic or methacrylic acid; with (B) about 5-35 weight percent, based on total binder solids, of a rosin ester component of at least partially hydrogenated rosin with a polyhydric alcohol, the rosin ester component having an abietic acid concentration not exceeding about 2 weight percent, a drop softening point above about 70° C., and an average molecular weight not exceeding about 2,000.
Claim 3
Dependent Claim
77 words
A low temperature binder system for nonwoven polyolefin fabric consisting essentially of (A) styrene/butylacrylate (25/75-65/35) latex or ethylene/vinylacetate aqueous copolymer dispersion; and (B) about 5-35 weight percent, based on total binder solid, of a rosin ester dispersion of at least partially hydrogenated rosin with a polyhydric alcohol, the ester component having an abietic acid concentration not exceeding about 2 weight percent, a drop softening point above about 70° C. and a molecular weight range of about 300-1,000.
Claim 4
Dependent Claim
77 words
A low temperature binder system for nonwoven polyolefin fabric consisting essentially of (A) styrene/butylacrylate (25/75-65/35) latex or ethylene/vinylacetate aqueous copolymer dispersion; and (B) about 5-35 weight percent, based on total binder solid, of a rosin ester dispersion of at least partially hydrogenated rosin with a polyhydric alcohol, the ester component having an abietic acid concentration not exceeding about 2 weight percent, a drop softening point above about 70° C. and a molecular weight range of about 300-1,000.
Claim 5
Dependent Claim
23 words
The binder system of claim 1, wherein the (B) component is a rosin ester having a drop softening point between about 75°-115° C.
Claim 6
Dependent Claim
17 words
The binder system of claim 1 wherein the (B) component has a molecular weight of about 300-1000.
Claim 7
Dependent Claim
28 words
The binder system of claim 1 wherein the (A) component is an ethylene/acrylic acid aqueous copolymer dispersion having a monomeric ratio of about 85/15-70/30 by weight of binder.
Claim 8
Dependent Claim
26 words
The binder system of claim 1 wherein the (A) component is a styrene/butylacrylate copolymer latex having a monomeric ratio of about 25/75-65/35 by weight of binder.
Claim 9
Dependent Claim
28 words
The binder system of claim 1 wherein the (A) component is an ethylene/vinyl acetate aqueous copolymer dispersion having a monomeric ratio of about 25/75-75/25 by weight of binder.
Claim 10
Dependent Claim
26 words
The binder system of claim 1 wherein the (A) component is a styrene/butadiene copolymer latex having a monomeric ratio of about 30/70 by weight of binder.
Claim 11
Dependent Claim
23 words
The binder system of claim 1 wherein the (B) component comprises a dispersion of at least one rosin ester with glycerol or pentaerythritol.
Claim 12
Independent Claim
145 words
A method for increasing the multi-directional strength of nonwoven polyolefin-containing fabrics comprising contacting a corresponding fiber web with a binding amount of a lower temperature binder system comprising (A) An essentially non-crosslinkable non-crystalline polymer of at least one component selected from the group consisting of an ethylene/acrylic acid, styrene/lower alkyl acrylate, styrene/butadiene, ethylene/ethylacrylate, ethylene/vinyl acetate, and combination thereof with up to about 10 weight percent of acrylic or methacrylic acid as a third monomeric component; combined with (B) about 5-35 weight percent based on total binder solids, of a rosin ester dispersion of at least partially hydrogenated rosin with a polyhydric alcohol, the ester component having an abietic acid concentration not exceeding about 2 weight percent, a drop softening point above about 70° C., and an average molecular weight not exceeding about 2000; then drying and curing the treated fiber web to obtain a fabric.
Claim 13
Independent Claim
145 words
A method for increasing the multi-directional strength of nonwoven polyolefin-containing fabrics comprising contacting a corresponding fiber web with a binding amount of a lower temperature binder system comprising (A) An essentially non-crosslinkable non-crystalline polymer of at least one component selected from the group consisting of an ethylene/acrylic acid, styrene/lower alkyl acrylate, styrene/butadiene, ethylene/ethylacrylate, ethylene/vinyl acetate, and combination thereof with up to about 10 weight percent of acrylic or methacrylic acid as a third monomeric component; combined with (B) about 5-35 weight percent based on total binder solids, of a rosin ester dispersion of at least partially hydrogenated rosin with a polyhydric alcohol, the ester component having an abietic acid concentration not exceeding about 2 weight percent, a drop softening point above about 70° C., and an average molecular weight not exceeding about 2000; then drying and curing the treated fiber web to obtain a fabric.
Claim 14
Dependent Claim
48 words
A method for increasing the cross directional strength of a nonwoven polyolefin-containing fabric comprising contacting a fiber web with a binding amount of the low temperature binder system of claim 10, wherein the (B) component is a rosin ester having a drop softening point between 75° C.-115° C.
Claim 15
Dependent Claim
44 words
A method for increasing the cross directional wet strength of a nonwoven polyolefin-containing fabric comprising contacting a fiber web with a binding amount of the low temperature binder system of claim 10, wherein the (B) component has an average molecular weight of about 300-1000.
Claim 16
Dependent Claim
54 words
A method for increasing the cross directional wet strength of a nonwoven polyolefin-containing fabric comprising contacting a fiber web with a binding amount of the low temperature binder system of claim 12, wherein the (A) component is an ethylene/acrylic acid aqueous copolymer dispersion having a monomeric ratio of about 85/15-70/30 by weight of binder.
Claim 17
Dependent Claim
52 words
A method for increasing the cross directional wet strength of a nonwoven polyolefin-containing fabric comprising contacting a fiber web with a binding amount of the low temperature binder system of claim 12, wherein the (A) component is a styrene/butylacrylate copolymer latex having a monomeric ratio of about 25/75-65/35 by weight of binder.
Claim 18
Dependent Claim
54 words
A method for increasing the cross directional wet strength of a nonwoven polyolefin-containing fabric comprising contacting a fiber web with a binding amount of the low temperature binder system of claim 12, wherein the (A) component is an ethylene/vinyl acetate aqueous copolymer dispersion having a monomeric ratio of about 25/75-75/25 by weight of binder.
Claim 19
Dependent Claim
52 words
A method for increasing the cross directional wet strength of a nonwoven polyolefin-containing fabric comprising contacting a fiber web with a binding amount of the low temperature binder system of claim 12, wherein the (A) component is a styrene/butadiene copolymer latex having a monomeric ratio of about 30/70-70/30 by weight of binder.
Claim 20
Dependent Claim
53 words
A method for increasing the cross directional wet strength of a nonwoven polyolefin-containing fabric comprising contacting a fiber web with a binding amount of the low temperature binder system of claim 12 wherein the (A) component is an ethylene/ethylacrylate aqueous copolymer dispersion having a monomeric ratio of about 85/15-60/40 by weight of binder.
Claim 21
Dependent Claim
55 words
A method for increasing the cross directional wet strength of a nonwoven polyolefin-containing fabric comprising contacting a fiber web with a binding amount of the low temperature binder system of claim 14, wherein the (A) component additionally contains an effective amount up to about 10% by weight of binder of acrylic acid or methacrylic acid.
Claim 22
Dependent Claim
55 words
A method for increasing the cross directional wet strength of a nonwoven polyolefin-containing fabric comprising contacting a fiber web with a binding amount of the low temperature binder system of claim 15, wherein the (A) component additionally contains an effective amount up to about 10% by weight of binder of acrylic acid or methacrylic acid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |