Amphiphilic polyesters, preparation thereof, and use thereof in

Details Amphiphilic polyesters, preparation thereof, and use thereof in Amphiphilic polyesters, preparation thereof, and use thereof in

1996-08-05

1998-07-07

Acquah, Samuel A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

528271, 528272, 528300, 528302, 528306, 528308, 5283086, 528361, 525444, 25217423, C08F 2000

Patent

active

057770468

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to amphiphilic polyesters, processes for preparing them, and their use as additive in laundry detergents and laundry aftertreatments.
U.S. Pat. No. 3,557,039 discloses stable aqueous dispersions of polymers preparable by condensation of terephthalic acid or dimethyl terephthalate with ethylene glycol and polyethylene glycol having an average molecular weight of from 1000 to 4000. The molar ratio of ethylene terephthalate to polyethylene glycol terephthalate units is within the range from 2:1 to 6:1. The dispersions are used for treating the surfaces of polyester articles.
GB-A1 154 730 discloses reducing soil redeposition in the washing of textile material by adding to the wash liquor, which contains a detergent, polycondensates containing either repeating ester or amide units. These additives are for example condensation products known from the above-cited U.S. Pat. No. 3,557,039 and are obtainable by condensation of dimethyl terephthalate, ethylene glycol and polyethylene glycol having a molecular weight of 1500.
EP Applications 185 427, 241 984, 241 985 and 272 033 disclose polyester condensates of polybasic aromatic carboxylic acids with dihydric alcohols and one-sidedly C.sub.1 14 C.sub.4 -capped polyethers, which promote soil release from polyester fabrics. These polyesters have hydrophilic end groups which, in the cited applications, are mentioned as the basis of the soil-releasing 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, Volume 17, 499-506 (1987).
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.24 -alcohols, C.sub.8 -C.sub.18 -alkylphenols or C.sub.8 -C.sub.24 -alkylamines temperatures of at least 120.degree. C. to weight average molecular weights of from 2000 to 50,000. The polyesters are used as grayness-inhibiting and soil-release additive in pulverulent and liquid laundry detergents.
It is an object of the present invention to provide novel substances and laundry detergent additives.
We have found that this object is achieved by amphiphilic polyesters containing of from 500 to 7500 and aliphatic dicarboxylic acids and/or monohydroxymonocarboxylic acids and alcohols
The amphiphilic polyesters are obtained by polycondensing to prepare first of from 500 to 7500 with aliphatic dicarboxylic acids and/or monohydroxymonocarboxylic acids and then, within the aliphatic polyester thus obtained, alcohols, aromatic polyesters (b) with oligomeric aliphatic polyesters (a).
The above-described amphiphilic polyesters are used as additive in laundry detergents, other laundry detergent additives and laundry aftertreatments.
The amphiphilic polyesters having ester units derived from (a) polyalkylene glycols and aliphatic dicarboxylic acids and/or monohydroxymonocarboxylic acids (hereinafter called "aliphatic block") and (b) aromatic dicarboxylic acids and polyhydric alcohols (hereinafter called "aromatic block") have soil-release properties in wash liquors and are very readily biodegradable.
The aliphatic blocks (a) are prepared by polycondensation of polyalkylene glycols having a molecular weight of from 500 to 7500 with aliphatic dicarboxylic acids and/or monohydroxy-monocarboxylic acids in a conventional manner. The polycondensation is carried out for example at temperatures of at least 120.degree. C., preferably within the temperature range from 150.degree. to 260.degree. C., in the presence of customary polycondensation or transesterification catalysts. Typically, the reaction participants are condensed in an inert gas atmosphere in the presence or absence of further additives, such as antioxidants. Such processes are known for example from U.S. Pat. No. 3,557,039 mentioned at the beginning.
Suitabl

REFERENCES:
patent: 3083187 (1963-03-01), Stuart et al.
patent: 3310512 (1967-03-01), Curtice
patent: 3557039 (1971-01-01), McIntyre et al.
patent: 4702857 (1987-10-01), Gosselink
patent: 4713194 (1987-12-01), Gosselink
patent: 4861512 (1989-08-01), Gosselink
patent: 5142020 (1992-08-01), Kud et al.
Polymer Bulletin, vol. 17, 499-506 (1987).

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