US4044178A
Expired / Lapsed
US
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Process for reinforcing nonwovens
Assignee: Novartis Corp
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Filing: 1976-01-12
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Granted: 1977-08-23
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Expires: 1996-01-12
Abstract
Abstract A process for reinforcing nonwovens by the foaming process accompanied by the use of binding agents and foaming assistants is provided. The nonwovens are treated with preparations which contain at least one binding agent and as foaming agents and a reactive surfactant which is converted into the irreversibly insoluble state at elevated temperature and thereby loses its surface activity. The treated nonwovens are then subjected to a heat treatment, time-consuming washing and rinsing procedures of the treated materials are not necessary.
Inventors
- 👤 Heinz Abel
- 👤 Rosemarie Toepfl
- 👤 Luzius Schibler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:42
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/39; D06M15/423; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/64; D04H1/68; D06M15/427
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
242 words
A process for reinforcing nonwoven fiber material by a foaming process, comprising the steps of A. impregnating the nonwoven fiber material with an aqueous preparation containing a water-soluble or water-dispersible binding agent and a foaming assistant, wherein the binding agent is a reaction product obtained by reacting, in the presence of an organic solvent, a. an epoxide which contains at least 2 epoxide groups per molecule, b. a fatty amine having 12 to 22 carbon atoms, and c 1 . an aliphatic, saturated dicarboxylic acid containing 7 to 14 carbon atoms, and wherein the foaming assistant is a reactive surfactant which is convertable into the irreversibly insoluble state at elevated temperature and thereby loses its surface activity, the foaming assistant being a surface active methylolmelamine or methylolurea having methylol groups etherified with a monoalcohol of 4 to 22 carbon atoms and at least one member of the group consisting of an alkanolamine of 2 to 6 carbon atoms, a polyethyleneglycol having an average molecular weight of 1000 to 5000, an alkanol of the formula H--(OCH 2 CH 2 ) m --OH where m is 1 to 25 and which contains an alkali metal sulfonate group bonded to carbon and an aliphatic-hydroxy-carboxylic acid containing 2 to 4 carbon atoms, and B. subsequently heating the impregnated non-woven fiber material at 60° to 190° C to convert the foaming assistant to an irreversibly insoluble state and to destroy the surface activity of the foaming assistant.
Claim 2
Dependent Claim
242 words
A process for reinforcing nonwoven fiber material by a foaming process, comprising the steps of A. impregnating the nonwoven fiber material with an aqueous preparation containing a water-soluble or water-dispersible binding agent and a foaming assistant, wherein the binding agent is a reaction product obtained by reacting, in the presence of an organic solvent, a. an epoxide which contains at least 2 epoxide groups per molecule, b. a fatty amine having 12 to 22 carbon atoms, and c 1 . an aliphatic, saturated dicarboxylic acid containing 7 to 14 carbon atoms, and wherein the foaming assistant is a reactive surfactant which is convertable into the irreversibly insoluble state at elevated temperature and thereby loses its surface activity, the foaming assistant being a surface active methylolmelamine or methylolurea having methylol groups etherified with a monoalcohol of 4 to 22 carbon atoms and at least one member of the group consisting of an alkanolamine of 2 to 6 carbon atoms, a polyethyleneglycol having an average molecular weight of 1000 to 5000, an alkanol of the formula H--(OCH 2 CH 2 ) m --OH where m is 1 to 25 and which contains an alkali metal sulfonate group bonded to carbon and an aliphatic-hydroxy-carboxylic acid containing 2 to 4 carbon atoms, and B. subsequently heating the impregnated non-woven fiber material at 60° to 190° C to convert the foaming assistant to an irreversibly insoluble state and to destroy the surface activity of the foaming assistant.
Claim 3
Dependent Claim
52 words
The process of claim 1, wherein the reactive surfactant is methylolurea or methylolmelamine having methylol groups etherified with an alkanol which contains 4 to 22 carbon atoms, a saturated hydroxyalkane-carboxylic acid which contains from 2 to 4 carbon atoms, and a member selected from the group consisting of ethanolamine, diethanolamine and triethanolamine.
Claim 4
Dependent Claim
40 words
The process of claim 1, wherein the reactive surfactant is methylolmelamine whose methylol groups are etherified with an alkanol which contains 4 to 18 carbon atoms, and with a member selected from the group consisting of ethanolamine, diethanolamine and triethanolamine.
Claim 5
Dependent Claim
17 words
The process of claim 1, wherein the heat treatment is carried out at 90° to 150° C.
Claim 6
Dependent Claim
17 words
The process of claim 1 wherein the binder/foaming assistant preparation also contains a thickening agent as additive.
Claim 7
Dependent Claim
16 words
The process of claim 5, wherein nonwoven fiber material of glass or textile fibers is used.
Claim 8
Dependent Claim
22 words
The process of claim 6, wherein nonwoven fiber material which contains fibers of polyamide, viscose staple, polyester, polyacrylonitrile or polypropylene, are reinforced.
Claim 9
Dependent Claim
32 words
The process of claim 1, wherein the binding agent is a condensation product of components (a), (b) and (c 1 ) in admixture with an aminoplast precondensate which contains alkyl ether groups.
Claim 10
Dependent Claim
18 words
The process of claim 1, wherein the component (a) is an epoxide which is derived from a bisphenol.
Claim 11
Dependent Claim
15 words
The process of claim 9, wherein the component (a) is a polyglycidyl ether of 2,2-bis-(4'-hydroxyphenyl)-propane.
Claim 12
Dependent Claim
21 words
The process of claim 10, wherein the component (a) has an epoxide contant of at least 5 epoxide equivalents per kg.
Claim 13
Dependent Claim
17 words
The process of claim 10, wherein the component (a) is a reaction product of epichlorohydrin with 2,2-bis-(4'-hydroxyphenyl)-propane.
Claim 14
Dependent Claim
75 words
The process of claim 1, wherein the binding agent is a reaction product obtained by reacting components (a), (b), (c 1 ) and additionally, one or more of the following components: d. an aminoplast precondensate which contains a C 1 to C 4 alkyl ether group, e. an aliphatic diol containing from 2 to 22 carbon atoms, and f. a difunctional compound selected from the group consisting of epichlorohydrin, glycerine-dichlorohydrin, acrylic acid, acrylonitrile and methylolacrylamide.
Claim 15
Dependent Claim
26 words
The process of claim 13, wherein the binding agent is a reaction product obtained by reacting components (a), (b), (c 1 ), (d), (e) and (f).
Claim 16
Dependent Claim
23 words
The process of claim 14, wherein component (d) is a hexamethylolmelamine di- and tri-butylether, component (e) is neopentylglycol, and component (f) is epichlorohydrin.
Claim 17
Dependent Claim
25 words
The process of claim 13, wherein the component (e) is an alkylene diol containing from 2 to 6 carbon atoms, diethylene glycol or triethylene glycol.
Claim 18
Dependent Claim
67 words
The process of claim 1, wherein the binding agent is a reaction product obtained by reacting components (a), (b), (c 1 ) and (c 2 ) which is an anhydride of an aromatic dicarboxylic acid of 8 to 12 carbon atoms or anhydride of an aliphatic di- or monocarboxylic acid of 4 to 10 carbon atoms, in admixture with an aminoplast precondensate which contains alkyl ether groups.
Claim 19
Dependent Claim
132 words
The process of claim 1, wherein the binding agent is a reaction product obtained by reacting components (a), (b), (c 1 ) and additionally (c 2 ), wherein component (c 2 ) is an anhydride selected from the group consisting of an anhydride of an aromatic dicarboxylic acid of 8 to 12 carbon atoms, an anhydride of an aliphatic dicarboxylic acid of 4 to 10 carbon atoms, and an anhydride of a monocarboxylic acid containing at least 4 carbon atoms, and additionally one or more of the following components: d. an aminoplast precondensate which contains C 1 to C 4 alkyl ether group, c. an aliphatic diol containing from 2 to 22 carbon atoms, and f. a difunctional compound selected from the group consisting of epichlorohydrin, glycerine-dichlorohydrin, acrylic acid acrylonitrile and methylolacrylamide.
Claim 20
Dependent Claim
80 words
The process of claim 1, wherein the binding agent is a reaction product obtained by reacting components (a), (b), (c 1 ) and additionally (c 2 ) wherein component (c 2 ) is selected from the group of anhydrides consisting of an anhydride of an aromatic dicarboxylic acid containing 8 to 12 carbon atoms, an anhydride of an aliphatic dicarboxylic acid of 4 to 10 carbon atoms, and an anhydride of a monocarboxylic acid containing at least 4 carbon atoms.
References Cited (Backward Citations)
GB1022215A
Cited
US3598770A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |