Bonded structures of textile materials

• US 4,430,380 A
• Filed: 03/22/1982
• Issued: 02/07/1984
• Est. Priority Date: 03/26/1981
• Status: Expired due to Fees

• Current Assignee: Cassella Aktiengesellschaft (Sanofi )
• Original Assignee: Cassella Aktiengesellschaft (Sanofi )
• Inventors: Michel, Walter, Seidel, Manfred, Piesch, Steffen, Honel, Hans, Schluter, Karin, Spieler, Wolfgang
• Primary Examiner(s): MCCAMISH, MARION E
• Application Number:
  US06/360,217
• Time in Patent Office: 687 Days
• Field of Search: 428/254, 428/278, 428/280, 428/288, 428/290, 427/372.2, 427/389.9
• US Class Current: 442/152
• CPC Class Codes: C08G 12/32 Melamines
• CPC Class Codes: C08G 12/34 and acyclic or carbocyclic compounds
• CPC Class Codes: C08G 12/40 Chemically modified polycondensates
• CPC Class Codes: C08J 2361/28 with melamine
• CPC Class Codes: C08J 5/245 using natural fibres
• CPC Class Codes: C08J 5/246 using polymer based synthetic fibres
• CPC Class Codes: D04H 1/435 Polyesters
• CPC Class Codes: D04H 1/587 characterised by the bonding agents used
• CPC Class Codes: D04H 1/64 the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions
• CPC Class Codes: Y10T 442/2762 Coated or impregnated natural fiber fabric [e.g., cotton, wool, silk, linen, etc.]
• CPC Class Codes: Y10T 442/2844 Melamine-aldehyde condensate
• CPC Class Codes: Y10T 442/2861 Coated or impregnated synthetic organic fiber fabric
• CPC Class Codes: Y10T 442/2893 Coated or impregnated polyamide fiber fabric
• CPC Class Codes: Y10T 442/2918 Polypropylene fiber fabric

Abstract

A bonded structure of textile materials bonded by a melamine-formaldehyde precondensate is produced by applying to a textile material a melamine-formaldehyde precondensate with a molar ratio of melamine to formaldehyde of 1:(0.8 to 1.26) to form a composite and then compressing the composite with an overpressure of 1 to 200 bars at temperature of from 130° to 220° C.

Claims

1. In a bonded structure of textile materials bonded by a melamine-formaldehyde precondensate and cured at an elevated temperature and a elevated pressure, the improvement comprises said melamine-formaldehyde precondensate having been prepared by heating melamine in an aqueous solution or suspension with formaldehyde in a molar ratio of 1:

(0.8 to 1.26) at a pH value of 7-11 in the presence of 1 to 25% by weight of modifying agents relative to the total weight of melamine and formaldehyde, and at least 1.0% being an alkali metal salt or alkaline earth metal salt of amidosulphonic acid, at temperatures of 105°

to 160°

C. until a limited dilutability with water is achieved or further heating until an unlimited dilutability with water is achieved.

2. The bonded structure according to claim 1 wherein said melamine-formaldehyde precondensate contains at least 7.5% by weight relative to the total weight of melamine and formaldehyde of an alkali metal salt or alkaline earth metal salt of amidosulphonic acid.

3. The bonded structure according to claim 1 wherein said modifying agents are selected from the group consisting of carboxyamides, sulphonamides, glycols, polyglycols, polyglycerol, trimethylolpropane, pentaerythritol, sugars, polymeric sugars, glycol esters, alcohols, ε

-caprolactam, methylene-bis-formamide, methylene-bis-acrylamide, a reaction product of formaldehyde/formamide/ε

-caprolactam, urea, thiourea, propyleneurea, ethyleneurea, glyoxalurea, acetoguanamine, formoguanamine, benzoguanamine, and adipo-bis-guanamine.

4. The bonded structure according to claim 1 wherein said melamine-formaldehyde precondensate has a molar ratio of melamine to formaldehyde of 1:

(1.01 to 1.2).

5. The process for production of a bonded textile structure according to claim 1 or claim 4 comprising applying 1 to 250% by weight, of a resin to a textile material wherein said resin is a melamine-formaldehyde precondensate having been prepared by heating melamine in an aqueous solution or suspension with formaldehyde in a molar ration of 1:

(0.8 to 1.26) at a pH value of 7-11 in the presence of 1 to 25% by weight of modifying agents relative to the total weight of melamine and formaldehyde, and at least 1.0% being an alkali metal salt or alkaline earth metal salt of adiposulphonic acid, at temperatures of 105°

to 160°

C. until a limited dilutability with water is achieved or further heating until an unlimited dilutability with water is achieved and, compressing the textile material/resin composite with an over-pressure of 1 to 200 bars and at temperatures of 13°

to 220°

C.

6. The process according to claim 5 wherein said composite is compressed with an over-pressure of 2 to 100 bars.

7. The process according to claim 5 wherein said precondensate has a molar ratio of melamine to formaldehyde of 1:

(1.01 to 1.2).

8. The process according to claim 5 wherein said resin is applied in the form of a aqueous, alcoholic or aqueous/alcoholic solution of 1 to 60% by weight of resin.

9. The process according to claim 5 wherein said compression is in the presence of 0.1 to 5% by weight, relative to solid resin, of a latent curing agent.

10. The process according to claim 5 wherein said compression is at temperatures of 150°

to 180°

C.

11. The process according to claim 5 wherein said resin is applied to the textile material in the form of a solid powder and is sintered-on prior to compression.