Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1995-03-22
1997-09-16
Reddick, Judy M.
Coating processes
With post-treatment of coating or coating material
Heating or drying
427392, 4273932, 524457, 524734, 524732, 524 56, 526200, B05D 302
Patent
active
056678487
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to the use of aqueous polymer dispersions obtainable by polymerizing free-radically polymerizable unsaturated monomers in aqueous phase in the presence of a saccharide or of a mixture of saccharides by the method of free-radical aqueous emulsion polymerization as textile auxiliaries for the easy-care finishing of textiles. It further relates to a method for the easy-care finishing of textiles and to textile auxiliary formulations comprising the aqueous polymer dispersions mentioned.
Aqueous dispersions of film-forming polymers are known for use as auxiliaries in the easy-care resin finishing of textiles. In addition to the units responsible for the film-forming properties, which are usually acrylate based, they additionally contain copolymerized monomer units with groups capable of reacting with reactive resin finishes (crosslinkers) in the presence of catalysts. The reactive monomer units used are usually N-methylol compounds of acrylamide and methacrylamide and esters of unsaturated organic acids such as acrylic acid or methacrylic acid.
For instance, DE-B-1 209 989 (1) describes dispersions of copolymers of an N-methylolamide of an acrylic acid, a component having at least two polymerizable double bonds in the molecule and further polymerizable compounds for use as textile auxiliaries.
DE-B-1 110 606 (2) likewise discloses that a copolymer of an N-methylolamide of an acrylic acid and other polymerizable compounds can be used for the resin finishing of cellulose fabrics.
These commercial film-forming polymers are usually added as auxiliary additives to aqueous finishing liquors in order to obtain the desired easy-care properties on the finished textile fabric. The effect is to improve a wide range of properties.
EP-A-345 566 (3) concerns formaldehyde-free crosslinking agents based on a copolymer of hydroxyl-free monomers and hydroxyl-containing components such as polyvinyl alcohol, starch, starch derivatives or colloidal cellulose. These crosslinking agents are used to produce nonwoven fibrous structures incorporating at least 10% by weight of this agent.
The disadvantage of the known polymer dispersions as described for example in (1) or (2), however, is their poor shear stability on the squeeze (pad-mangle) rolls. The high shearing forces of pad-mangle rolls, in particular at higher production speeds and in the case of dense textile material, cause the dispersions to break, precipitating the film-forming polymer from the dispersion. The rolls become covered with a film which can cause difficult-to-remove stains on the textile material.
Moreover, the known film-forming polymer dispersions used in easy-care finishing are anionic, which severely limits their use alongside other auxiliaries in the impregnating bath. They are incompatible with all cationic auxiliaries.
It is an object of the present invention to provide novel polymer dispersions for the stated use which are free of the disadvantages of the prior art agents.
We have found that this object is achieved by the aqueous polymer dispersions defined at the beginning.
Saccharides as the term is used herein are monosaccharides, oligosaccharides, polysaccharides, oxidatively, hydrolytically and/or enzymatically degraded polysaccharides and chemically modified mono-, oligo- and polysaccharides.
Suitable free-radically polymerizable monomers include inter alia in particular monoethylenically unsaturated monomers such as olefins, for example ethylene, aromatic vinyl monomers such as styrene, .alpha.-methylstyrene, o-chlorostyrene or vinyltoluenes, vinyl halides and vinylidene halides such as vinyl chloride and vinylidene chloride, esters of vinyl alcohol with mono-carboxylic acids having from 1 to 18 carbon atoms such as vinyl acetate, vinyl propioniate, vinyl n-butyrate, vinyl laurate and vinyl stearate, esters of .alpha.,.beta.-monoethylenically unsaturated mono- and dicarboxylic acids of preferably from 3 to 6 carbon atoms such as in particular acrylic acid, methacrylic acid, maleic acid, fumaric acid and itaconic acid wi
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Simenc Toni
Wuestefeld Renate
BASF - Aktiengesellschaft
Reddick Judy M.
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