Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1997-05-16
1998-11-10
Merriam, Andrew E. C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524417, 524423, 524425, 524450, 524599, 523309, 523340, 528302, 528308, 510349, 252228, 252242, C11D 337, C08G 6320
Patent
active
058345485
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a process for preparing finely divided mixtures of amphiphilic polymers and inorganic solids, and to the use of the mixtures as additive to detergents.
Description of the Background Art
Amphiphilic polymers with very different properties in the solid state are known. They can be crystalline, partly crystalline, glassy or, above the glass transition temperature, elastomeric. Amphiphilic polymers with a high degree of crystallinity are prepared for example by condensation of terephthalic acid or dimethyl terephthalate with ethylene glycol and polyethylene glycol (cf. U.S. Pat. No. 3,557,039). Such polyesters are used as detergent additive. In the washing of textile material they inhibit the redeposition of soil on the textile material; cf. GB-A-1 154 730.
EP Applications 185 427, 241 984, 241 985 and 272 033 disclose polyester condensates of polybasic aromatic carboxylic acids with dihydric alcohols and unilaterally C.sub.1 -C.sub.4 -alkyl-capped polyethers, which promote soil release from polyester fabrics. These polyesters have hydrophilic end groups which, in the applications mentioned, are said to be a prerequisite for the soil release properties of the polyesters.
Amphiphilic polyesters of aliphatic polybasic carboxylic acids and/or monohydroxymonocarboxylic acids with polyethylene glycol are described for example in Polymer Bulletin 17 (1987), 499-506.
U.S. Pat. No. 5,142,020 discloses amphiphilic polyesters obtainable by condensation of anhydrides or mixtures, of at least one alkylene oxide having 2 or 3 carbon atoms with 1 mol of an at least dihydric alcohol or mixtures, and alkylene oxide with 1 mol of C.sub.8 -C.sub.29 -alcohols, C.sub.8 -C.sub.18 -alkylphenols or C.sub.8 -C.sub.18 -alkylamines in a molar ratio of (a):(b):(c) of 100:(from 25 to 2500):(from 5 to 110) at temperatures of at least 120.degree. C. to weight average molecular weights of from 2000 to 50,000. The polyesters are used as antiredeposition and soil-releasing ingredient of pulverulent and liquid detergents.
The above-described polyesters are usually incorporated into the detergent formulations in the form of aqueous solutions or dispersions. However, this use form is in many cases impractical or even unsuitable. For example, most dispersions of such amphiphilic polyesters cannot be processed in concentrations above 25% at room temperature since the viscosity is too high. In addition, processing aqueous dispersions of amphiphilic polyesters under alkaline conditions at the customary higher processing temperatures is usually likely to result in a hydrolysis and hence reduced effectiveness of the polyesters.
Prior artisans have therefore ground mixtures of amphiphilic polyesters and extrudable organic solids together in solid form, subsequently extruded the mixture, and formed the extrudate for example into granules; cf. DE-A-22 49 812. DE-A-35 31 755 discloses mixtures of amphiphilic polyesters and polycarboxylates, obtainable by mixing molten polyesters with a polyacrylate, cooling the mixture and comminuting the resulting solid product to the desired particle size by cryogenic methods. This cryogenic comminution of the material is carried out at temperatures below 0.degree. C., sometimes even below -50.degree. C. The coolant recommended for this purpose is liquid nitrogen or solid carbon dioxide (dry ice).
The amphiphilic polyesters in granule form hitherto described have only low mechanical stability and are subject to caking on storage. JP-A-55/109 614 discloses mixing polyester resins and fillers in the solid state in a mill. In this case, the inorganic fillers act essentially as release agents intended to prevent clogging of the mill by immediately covering the tacky surfaces of the polyester resins. The disadvantage of this process is that the release agents are deposited virtually only on the surface of the particles and therefore cannot display any shape-stabilizing effect.
OBJECTS OF THE INVENTION
It is an object of the present invention to provide a proces
REFERENCES:
patent: 3557039 (1971-01-01), McIntyre et al.
patent: 4020015 (1977-04-01), Bevan
patent: 5142020 (1992-08-01), Kud et al.
Synthesis and NMR Study of Some Aliphatic Block and Branched .alpha., .omega.-Dihydroxy Polyesterethers, A. Edelman, et al., Polymer Bulletin, 17, pp. 499-506 (1987).
World Patent Index 63-80, File 350, Dialog accession No. 002552622, WPIaccession No. 80-70647C/40, Matsushita Elec. Works: "Pulverising solid thermosetting resin condensn.prod,-in presence of powdery filler to improve dispersibility of pulverised resin in blender", JP A 55109614, 80/08/23, 8040 (Basic).
Boeckh Dieter
Brockel Ulrich
Jager Hans-Ulrich
Muller Frank
Schornick Gunnar
BASF - Aktiengesellschaft
Merriam Andrew E. C.
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