Patent US2855974A successfully refreshed from Google Patents.
Patent US3766002A successfully refreshed from Google Patents.
US3766002A
Expired / Lapsed
US
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Nonwoven products
Assignee: Indopco Inc
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Filing: 1970-12-02
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Granted: 1973-10-16
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Expires: 1990-12-02
Abstract
Abstract This invention is directed to producing polymeric binding agents in fibrous form for nonwoven fabrics and for nonwoven fabrics incorporating such polymeric binding agents in fibrous form, the fibrous form polymeric binding agents being obtained by introducing an anionic latex in fine thread-like form into a precipitating aqueous solution of a water-soluble cationic polymer, and thereby forming a fibrous precipitate of the anionic latex in the cationic solution. The nonwoven fabrics produced are characterized by their unusually high strength.
Inventors
- 👤 D Greif
- 👤 F Schultz
- 👤 H Hernandez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:07
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; C; C08; C08J; C08J5/00; C08J5/02; D04H1/58; D04H1/587; D04H1/64; D06; D06M; D06M15/00; D06M15/19; D06M15/21; D06M15/227; D06M15/233; D06M15/263; D06M15/267; D06M15/31; Y; Y10; Y10S; Y10S528/00; Y10S528/931; Y10S528/934; Y10S528/936
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
93 words
A process for preparing a polymeric binding agent in fibrous form which consists in introducing an anionic latex of a polymer, having a glass transition temperature of from about -52*C to +25*C, selected from the group consisting of polymers having an anionic backbone and polymers having a neutral backbone in fine thread-like form into an agitated precipitating aqueous solution containing about 0.3 to about 5 percent, by weight, of a water soluble cationic polymer and thereby forming a fibrous precipitate of thread-like binder particles of the anionic latex in the cationic polymer solution.
Claim 2
Dependent Claim
37 words
The process of claim 1, in which the anionic latex is introduced into the precipitating aqueous solution of the cationic polymer through tubing having at least one orifice of a diameter of from 0.01 to 0.05 inches.
Claim 3
Dependent Claim
43 words
The process of claim 1, wherein the anionic latex is a homo-or copolymer of monomers selected from the group consisting of: vinyl acetate, vinyl chloride, vinyl esters of alpha-branched saturated aliphatic monocarboxylic acids, vinylidene chloride, alkyl acrylates and methacrylates, butadiene, acrylonitrile and styrene.
Claim 4
Dependent Claim
33 words
The process of claim 1, wherein the polymer of the anionic latex also contains a monomer selected from the group consisting of N-methylol acrylamide, ethylenically unsaturated monocarboxylic acids, and ethylenically unsaturated dicarboxylic acids.
Claim 5
Dependent Claim
63 words
The process of claim 1, wherein the water-soluble Cationic polymer is selected from the group consisting of: acid salts of aminoalkyl esters of carboxylic acid polymers, high molecular weight polysulfur amidoamines, copolymers of Beta -hydroxyalkyl ethylenically unsaturated ester with vinyl tertiary amine, polyamine polymers, polyalkylenimine polymers, amine modified acrylamide polymers, quaternary amine-containing polymers, and starches which have beem modified to contain cationic groups.
Claim 6
Dependent Claim
80 words
A process for preparing a polymeric binding agent in fibrous thread-like binder particles form which consists in introducing in fine thread-like form an anionic latex of an ethyl acrylate: butyl acrylate:vinyl acetate: N-methylol acrylamide (60:30:10:3) polymer having a glass transition temperature (Tg) of about -21*C. into an agitated precipitating solution comprising an aqueous solution of a nitrate salt of poly(2-aminoethyl acrylate: 2-hydroxypropyl acrylate) (62.5:37.5), said salt being present in a concentration of from about 0.3 to 4.5 percent, by weight.
Claim 7
Dependent Claim
32 words
The process of claim 7 in which the anionic latex is introduced into the precipitating solution through tubing having at least one orifice of a diameter of from 0.01 to 0.05 inches.
Claim 8
Dependent Claim
132 words
A process for preparing a nonwoven sheet which comprises: A. introducing an aqueous anionic latex of a polymer selected from the group consisting of polymers having an anionic backbone and polymers having a neutral backbone having a glass transition temperature of from about +25* to -52*C through at least one orifice having a diameter of from about 0.01 to 0.05 inches into an agitated, aqueous precipitating solution containing about 0.3 to about 5%, by weight, of a water-soluble cationic polymer; B. admixing the resultant fibrous thread-like binder precipitated particles with natural or synthetic fibers in a concentration such that said binder constitutes from about 10 to 80 percent, by weight, of the dry nonwoven sheet; C. forming a nonwoven web from the resultant solids thereof, and, D. drying the resultant nonwoven web.
Claim 9
Dependent Claim
128 words
A process for preparing a nonwoven sheet which comprises: A. introducing an aqueous anionic latex of a polymer selected from the group consisting of polymers having an anionic backbone and polymers having a neutral backbone and having a glass transition temperature of from about +25* to -52*C through at least one orifice having a diameter of from about 0.01 to 0.05 inches into an agitated, aqueous precipitating solution containing about 0.3% to about 5%, by weight, of a water-soluble cationic polymer thereby forming thread-like binder particles to which has been added from about 20 - 90 percent, by weight, based on the weight of the nonwoven, of natural or synthetic fibers; B. forming a nonwoven web from the resultant solids thereof, and, C. drying the resultant nonwoven web.
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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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |