Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1998-11-25
2000-09-05
Cameron, Erma
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
5253282, 5253289, 5253294, 5253296, 5253299, 428375, 4285375, C08F 2000
Patent
active
061144649
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The present invention relates to aqueous thermally curable compositions of hydroxyalkylated polyamines and polycarboxylic acids and to their use.
Sheetlike fibrous structures, for example fiber webs, shaped articles such as chipboard, etc., are frequently consolidated chemically by means of a polymeric binder. To enhance the strength, especially the wet and heat resistance strengths, binders are frequently used that comprise formaldehyde-eliminating crosslinkers. But this means there is a danger of formaldehyde emissions.
Numerous alternatives to prior art binders have been proposed to avoid formaldehyde emissions. For instance, U.S. Pat. No. 4,076,917 discloses binders comprising carboxylic acid or carboxylic anhydride addition polymers and .beta.-hydroxyalkylamides as crosslinkers. The molar ratio of carboxyl groups to hydroxyl groups is preferably 1:1. The disadvantage is the relatively costly production of the .beta.-hydroxyalkylamides.
EP-A-445 578 discloses sheets composed of finely divided materials, for example glass fibers, in which mixtures of high molecular weight polycarboxylic acids and polyhydric alcohols, alkanolamines or polyacid amines act as binders. The disclosed high molecular weight polycarboxylic acids are polyacrylic acid, copolymers of methyl methacrylate
-butyl acrylate/methacrylic acid and of methyl methacrylate/methacrylic acid. The polyhydric alcohols and alkanolamines used are 2-hydroxymethylbutane-1,4-diol, trimethylolpropane, glycerol, poly(methyl methacrylate-co-hydroxypropyl acrylate), diethanolamine and triethanolamine.
EP-A-583 086 discloses formaldehyde-free aqueous binders for producing fiber webs, especially glass fiber webs. The binders comprise a polycarboxylic acid containing at least two carboxylic acid groups with or without anhydride groups. Polyacrylic acid in particular is used. The binder further comprises a polyol, for example glycerol, bis[N,N-di(.beta.-hydroxyethyl)]adipamide, pentaerythritol, diethylene glycol, ethylene glycol, gluconic acid, .beta.-D-lactose, sucrose, polyvinyl alcohol, diisopropanolamine, 2-(2-aminoethylamino)ethanol, triethanolamine, tris(hydroxymethylamino)methane and diethanolamine.
These binders require a phosphorus-containing reaction accelerant to obtain glass fiber webs having adequate strengths. The presence of such a reaction accelerant can only be dispensed with if a highly reactive polyol is used. .beta.-Hydroxyalkylamides are mentioned as highly reactive polyols.
EP-A-651 088 describes corresponding binders for substrates composed of cellulose fiber. For these binders the inclusion of a phosphorus-containing reaction accelerant is mandatory.
EP-A-672 920 describes formaldehyde-free binding, impregnating or coating compositions comprising an addition polymer constituted to from 2 to 100% by weight of an ethylenically unsaturated acid or anhydride as comonomer and at least one polyol. The polyols are substituted triazine, triazinetrione, benzene or cyclohexyl derivatives, the polyol radicals always being located in position 1,3,5 of the rings mentioned. Despite a high drying temperature, these binders provide only low wet breaking strengths on glass fiber webs. Amine-containing crosslinkers and predominantly linear polyols were tested too as part of comparative experiments. It is pointed out that amine-containing crosslinkers have a flocculating effect and that the predominantly linear polyols lead to weaker crosslinking than the cyclic polyols.
DE-A-22 14 450 describes a copolymer containing from 80 to 99% by weight of units derived from ethylene and from 1 to 20% by weight of units derived from maleic anhydride. The copolymer, in powder form or in dispersion in an aqueous medium, is used for surface coating together with a crosslinker. The crosslinker used is an amino-containing polyalcohol. However, to achieve crosslinking, it is necessary to heat up to 300.degree. C.
It is an object of the present invention to provide formaldehyde-free compositions which permit rapid curing at low temperature and impart good m
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Beckerle Wilhelm Friedrich
Kistenmacher Axel
Mohr Jurgen
Reck Bernd
Roser Joachim
BASF - Aktiengesellschaft
Cameron Erma
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