US4264645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving the water vapor absorption capacity of textile substrates
Assignee: Bayer AG
•
Filing: 1978-04-24
•
Granted: 1981-04-28
•
Expires: 1998-04-24
Abstract
Abstract The present invention is concerned with a method for improving the water storage capacity of textile substrates, particularly fleece based artificial leathers by treatment with a hydrophilizing agent. This agent, once applied to the substrate is insoluble in but swellable in water. The agent in an uncross-linked state is water soluble and has a turbidity point of between about 25° and 95° C. in a 25% aqueous solution. The agent may be applied to the substrate from aqueous solution and then cross-linked or it may be applied to an inert carrier such as kaolin, cross-linked and applied to the substrate from an aqueous suspension. A particularly suitable agent is a polyether with a molecular weight of between 500 and 8500, an ethylene oxide content of about 35 to 80 wt. % and cross-linkable end groups. The end groups may be self cross-linking such as vinyl groups or they may be cross-linkable via a cross-linking promoter such as hexamethylol melamine. These end groups include the hydroxyl groups normally present in polyethers produced from polyalkylene oxides.
Inventors
- 👤 Wulf von Bonin
- 👤 Hellmut Striegler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:45
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/12; D06N3/14; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/4837; C08G18/83; C08G18/84; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/564; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10T; Y10T442/00; Y10T442/20; Y10T442/2484
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
122 words
In a process for improving the water vapor absorption capacity of textile substrates by treatment with hydrophilizing agents, the improvement comprising using a hydrophilizing agent which: (a) has a turbidity point of between 25° and 95° C. in 25% aqueous solution, and (b) is derived from a trifunctional mixed polyether with a molecular weight of between 2000 and 7000 and is comprised of (i) 40 to 75 wt. % of ethylene oxide units, (ii) alkylene oxide units other than ethylene oxide, and (iii) cross-linkable end groups of the formula ##STR1## wherein m is an integer of between 1 and 3 and R is the isocyanate free residue of a (m+1) functional tolyl isocyanate or the reaction product of said groups with formaldehyde.
Claim 2
Dependent Claim
122 words
In a process for improving the water vapor absorption capacity of textile substrates by treatment with hydrophilizing agents, the improvement comprising using a hydrophilizing agent which: (a) has a turbidity point of between 25° and 95° C. in 25% aqueous solution, and (b) is derived from a trifunctional mixed polyether with a molecular weight of between 2000 and 7000 and is comprised of (i) 40 to 75 wt. % of ethylene oxide units, (ii) alkylene oxide units other than ethylene oxide, and (iii) cross-linkable end groups of the formula ##STR1## wherein m is an integer of between 1 and 3 and R is the isocyanate free residue of a (m+1) functional tolyl isocyanate or the reaction product of said groups with formaldehyde.
Claim 3
Dependent Claim
60 words
The process according to claim 1, characterized in that the water-soluble polymeric compounds used as hydrophilising agents are of the kind which in the cross-linked state are insoluble in water but capable of swelling therein and in the uncross-linked state have turbidity points of between about 30° C. and 60° C. in the form of 25% by weight aqueous solutions.
Claim 4
Dependent Claim
27 words
The process according to claim 1 characterized in that the hydrophilising agents are used as mixtures with other binders in the course of the usual finishing process.
Claim 5
Dependent Claim
30 words
The process according to claim 1 characterized in that the hydrophilising agent is applied in a pre-cross-linked form to a finely powdered carrier substance and is suspended in this form.
Claim 6
Dependent Claim
16 words
The process according to claim 4, characterized in that the carrier substance used is silicic acid.
Claim 7
Dependent Claim
9 words
The process of claim 1 wherein m represents 1.
Claim 8
Dependent Claim
15 words
The process of claim 1 wherein the textile substrate is a synthetic leather based fleece.
Claim 9
Dependent Claim
13 words
The process of claim 1 wherein the other alkylene oxide is propylene oxide.
Claim 10
Dependent Claim
148 words
A process for improving the water vapor absorption capacity of synthetic leather substrates comprising treating said substrates with an aqueous solution of about 5 to 50 wt.% of a hydrophilising agent based on the weight of substrate wherein said agent (a) has a turbidity point of between about 25° and 95° C. in 25% aqueous solution, and (b) is derived from a mixed trifunctional polyether with a molecular weight of between about 2000 and 7000 and has (i) 40 to 75 wt. % of ethylene oxide units, (ii) cross-linkable end groups of the formula ##STR2## wherein m represents an integer of 1 to 3 and R represents the isocyanate free residue of a tolyl (m+1) functional isocyanate and the reaction product of groups of this formula with formaldehyde and (iii) alkylene oxide units other than ethylene oxide, drying the resulting treated substrate and cross-linking said cross-linkable end groups.
Claim 11
Dependent Claim
148 words
A process for improving the water vapor absorption capacity of synthetic leather substrates comprising treating said substrates with an aqueous solution of about 5 to 50 wt.% of a hydrophilising agent based on the weight of substrate wherein said agent (a) has a turbidity point of between about 25° and 95° C. in 25% aqueous solution, and (b) is derived from a mixed trifunctional polyether with a molecular weight of between about 2000 and 7000 and has (i) 40 to 75 wt. % of ethylene oxide units, (ii) cross-linkable end groups of the formula ##STR2## wherein m represents an integer of 1 to 3 and R represents the isocyanate free residue of a tolyl (m+1) functional isocyanate and the reaction product of groups of this formula with formaldehyde and (iii) alkylene oxide units other than ethylene oxide, drying the resulting treated substrate and cross-linking said cross-linkable end groups.
Claim 12
Dependent Claim
30 words
The process of claim 9 wherein the cross-linking is carried out in the presence of up to about 3 wt. % acid catalyst at between about 80° and 180° C.
Claim 13
Dependent Claim
87 words
The process of claims 9 or 10 wherein the hydrophilising agent is prepared by reacting a mixed polyalkylene ether having a molecular weight of between about 2000 and 7000 and between about 40 and 75 wt. % ethylene oxide units with at least two equivalents of a diisocyanate, reacting this product with at least an equivalent amount of ammonia in sufficient water to give a 5 to 60 wt. % solution of this product and reacting this product with between about 1.5 and 2 equivalents of formaldehyde.
Claim 14
Dependent Claim
166 words
A process for improving the water vapor absorption capacity of synthetic leather substrates comprising treating said substrates with an aqueous suspension having a solids content of about 25 to 40 wt. % wherein said suspension is prepared by (a) preparing a hydrophilising agent having a turbidity point of between about 25° and 90° C. in 25% aqueous solution and based upon a polyether with a molecular weight of between about 2000 and 7000, an ethylene oxide content of about 35 to 85 wt. %, alkylene oxide units other than ethylene oxide and cross-linkable end groups, (b) suspending said agent and an inert hydrophilic carrier substance in aqueous media, (c) heating the suspension above the turbidity point of said agent causing it to be adsorbed on the carrier, (d) drying the carrier and cross-linking said agent by heating at between about 100° and 160° C., (e) grinding the product so obtained to powder, and (f) dispersing the powder in aqueous media, and drying the resulting treated substrates.
Claim 15
Dependent Claim
166 words
A process for improving the water vapor absorption capacity of synthetic leather substrates comprising treating said substrates with an aqueous suspension having a solids content of about 25 to 40 wt. % wherein said suspension is prepared by (a) preparing a hydrophilising agent having a turbidity point of between about 25° and 90° C. in 25% aqueous solution and based upon a polyether with a molecular weight of between about 2000 and 7000, an ethylene oxide content of about 35 to 85 wt. %, alkylene oxide units other than ethylene oxide and cross-linkable end groups, (b) suspending said agent and an inert hydrophilic carrier substance in aqueous media, (c) heating the suspension above the turbidity point of said agent causing it to be adsorbed on the carrier, (d) drying the carrier and cross-linking said agent by heating at between about 100° and 160° C., (e) grinding the product so obtained to powder, and (f) dispersing the powder in aqueous media, and drying the resulting treated substrates.
References Cited (Backward Citations)
GB1095702A
Cited
GB1124271A
Cited
GB1128812A
Cited
GB1172085A
Cited
GB1180863A
Cited
US3632417A
Cited
US3940535A
Cited
US3949123A
Cited
US3865622A
Cited
US3985929A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-27 | 1984-10-27 | 1985-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-27 | 1988-10-27 | 1989-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-27 | 1992-10-27 | 1993-04-28 | $7700.00 | Window Closed / Lapsed |