Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1997-03-12
1998-06-09
Cameron, Erma
Coating processes
With post-treatment of coating or coating material
Heating or drying
427392, 4273931, 4273932, 4273934, 4273933, 428375, 428507, 428522, B05D 302
Patent
active
057630224
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1) Field of the Invention
The invention relates to the use of N-(alkoxymethyl) (meth)acrylamide-functional textile binders for improving the resistance to solvents in the finishing and bonding of fiber materials, and to a process for the preparation of solvent-resistant fiber structures.
2) Background Art
The use of aqueous copolymer dispersions as binders for bonding and coating fiber structures such as woven fabrics, nonwovens and waddings of textile fiber or textile yarns is known. Copolymer dispersions of (meth)acrylate or vinyl ester copolymers which comprise self-crosslinking comonomer units with N-methylol or N-methylol ether functions to improve their strength are often used here. Up to 10% by weight of N-methylol(meth)acrylamide (NMA or NMMA) are usually copolymerized. Disadvantages of these binders are the release of formaldehyde due to hydrolytic cleavage of the N-methylol function and the low resistance to solvents of the materials bonded or coated with them. Improvement of the resistance to solvents by incorporation of precrosslinking, poly-ethylenically unsaturated comonomer units is known. However, this measure often leads to problems in the preparation of the copolymers.
Thermally self-crosslinking copolymers which comprise 2 to 10% by weight of N-methylol(meth)acrylamide or the N-methylol ether thereof are known from DE-A 2512589 (U.S. Pat. No. 4,044,197). A disadvantage is that, although in the case of the N-methylolacrylamide-containing copolymers used therein the heat-treated copolymer films show a good resistance to solvents, the nonwovens bonded with them do not.
EP-B 205862 relates to textile binders based on vinyl acetate/ethylene copolymers which comprise 1 to 5% by weight of N-methylol(meth)acrylamide units or ethers thereof. To improve the wet strength if a copolymer binder of low NMA content is used, the additional use of melamine-formaldehyde resins is proposed.
The doctrine of EP-A 261378 is to improve the heat stability of fiber mats bonded with N-methylol-functional copolymers by employing as binders those copolymers in which the N-methylol functions are completely or partly etherified.
WO-A 92/08835 describes textile binders based on vinyl acetate/ethylene copolymer emulsions which comprise exclusively N-(n-butoxymethyl)acrylamide units instead of N-methylol(meth)acrylamide units to reduce the release of formaldehyde.
EP-A 86889 (AU-A 8310718) relates to a process for the preparation of a textile coating composition which shows no white swelling and no white fracture under the action of water. The coating composition comprises an aqueous copolymer emulsion which is obtained by emulsion copolymerization of (meth)acrylates with N-methylol(meth)acrylamide, the N-methylol(meth)acrylamides being etherified to the extent of at least 20 mol % with an alcohol and the emulsion polymerization being carried out in the presence of a fatty alcohol having 10 to 20 C atoms. The resistance of textile binders to solvents is not discussed.
SUMMARY OF THE INVENTION
The invention was based on the object of providing binders based on aqueous copolymer dispersions or copolymer powders which impart to textiles finished with them a high resistance to solvents, in addition to a high dry and wet strength.
Surprisingly, this has been achieved by using, instead of N-methylol-functional copolymers, those in which some of the N-methylol functions are etherified, with which the opposite effect was rather to be expected because of the hydrophobic character of the copolymers containing N-methylol ethers.
The invention relates to the use of N-(alkoxymethyl)(meth)acrylamide-functional textile binders for improving the resistance to solvents in the finishing and bonding of fiber materials with textile binders, which comprises using as the textile binder an aqueous copolymer dispersion or a redispersible copolymer powder of copolymers having a T.sub.g of -60.degree. C. to +60.degree. C. comprising unbranched or branched carboxylic acids having 1 to 12 C atoms, esters of acrylic
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patent: 4044197 (1977-08-01), Wiest et al.
patent: 4092303 (1978-05-01), Behrens
patent: 4987180 (1991-01-01), Ohata et al.
Koegler Gerhard
Lumpp Andreas
Cameron Erma
Wacker-Chemie GmbH
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