Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1999-03-17
2000-08-15
Boykin, Terressa M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528176, 528271, C08G 6302
Patent
active
06103858&
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a polyester dispersion comprising water and a biodegradable, aliphatic-aromatic copolyester, a process for its preparation and its use as a binder for nonwovens and for coating paper. The present invention further relates to the nonwoven produced using the polyester dispersion of the invention, a process for its production and its use.
The biodegradable copolyesters used in the aqueous polyester dispersion of the invention contain repeat units derived both from aromatic carboxylic acids or derivatives thereof and from aliphatic carboxylic acids and derivatives thereof and are known per se.
For instance, U.S. Pat. No. 5,446,079 and the parallel international application WO 92/09654 describe a linear, random, semicrystalline aliphatic-aromatic copolyester having a limiting viscosity number of about 0.5 to 1.8 dl/g, measured in 60/40 w/w phenol/tetrachloroethane at a concentration of 0.5 g/100 ml and at a temperature of 25.degree. C., the proportion of units derived from aromatic carboxylic acids being from 5 to 65 mol % and the proportion of repeat units derived from aliphatic carboxylic acids being from 95 to 35 mol %, in each case based on the total amount of repeat units derived from carboxylic acids. Not only the biodegradability of such polyesters also their use as moldings, films, etc. are described.
DE-A-44 32 161 describes biodegradable polyesters which are degraded in the natural environment and under the action of microorganisms which are condensed (a) from an aliphatic polyol and an aromatic polyol and an aliphatic polycarboxylic acid or (b) from an aliphatic polyol, optionally alongside an aromatic polyol, and an aromatic polycarboxylic acid as well as simultaneously aliphatic polycarboxylic acid, or (c) from an aromatic hydroxymonocarboxylic acid and an aliphatic hydroxymonocarboxylic acid as monomer components, the units derived from the monomer components being in random or alternating arrangement.
In addition, the biodegradable polyesters used herein are likewise described per se in a number of commonly assigned applications (DE-A-44 40 858, DE-A-44 40 850, DE-A-44 40 837, DE-A-44 40 836, DE-A-195 00 757, DE-A-195 00 756, DE-A-195 00 755, DE-A-195 00 754, DE-A-195 00 185, DE-A-195 05 186).
However, none of these references describe polyester dispersions utilizing these polyesters.
Polyester dispersions and their preparation are likewise known per se (see inter alia U.S. Pat. No. 3,546,008, EP-A-0 332 980 and EP-A-0 498 156). For instance, U.S. Pat. No. 3,546,008 describes fibrous products treated with a size comprising a linear polyester which disperses in water. This polyester is prepared starting from at least one carboxylic acid, at least one diol, provided at least 20% of the diol is polyethylene glycol, and a monomer having an SO.sub.3 M group, where M is hydrogen or a metal ion. Copolyesters of the type contemplated herein are not mentioned in this reference. Polyesters derived from carboxylic acid mixtures comprising hexahydroisophthalic acid and from a diol are exemplified. Such polyesters are not biodegradable, however.
EP-A-0 332 980 relates to a process for preparing aqueous polyester dispersions by condensing aromatic dicarboxylic acids or esters with at least one diol to form prepolymers having an acid number from 2 to 8. These prepolymers are subsequently reacted with at least one molecular weight enhancer compound to form polyesters having acid numbers of 40 to 60 and the polyester is dispersed by addition of aqueous mixtures of ammonia and amines in a molar ratio of 10:1 to 1:10 to a polyester melt having a temperature within the range from 150 to 210.degree. C. The reference further relates to the use of these polyester dispersions as sizes for sizing filament warp yarns. The polyesters used in this reference, which are based on aromatic dicarboxylic acids, have excellent mechanical properties, but virtually no biodegradability.
EP-A-0 498 156 describes aqueous polyesters for high solids baking finishes wherein the urethane-, carboxyl- and hyd
REFERENCES:
patent: 3546008 (1970-12-01), Shields et al.
patent: 4052368 (1977-10-01), Larson
patent: 5446079 (1995-08-01), Buchanan et al.
patent: 5543488 (1996-08-01), Miller et al.
Beimborn Dieter Bernhard
Hummerich Rainer
Kim Son Nguyen
Pagga Udo
Schumacher Karl-Heinz
BASF - Aktiengesellschaft
Boykin Terressa M.
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