Patent ID: 6103858
Filing Date: 2000-08-15
Classification: C08G,C09D,C09K,D04H,Y02A

Abstract:
A polyester dispersion comprising(A) from 20 to 90% by weight of water, and(B) from 10 to 80% by weight of a biodegradable copolyester (B) containing free acid groups and structural units derived from both aliphatic and aromatic carboxylic acids or derivatives thereof, obtained by reaction of a mixture comprising(a1) a mixture comprising(a11) from 20 to 95 mol % of adipic acid or of an ester-forming derivative thereof or of a mixture of two or more thereof,(a12) from 5 to 80 mol % of an terephthalic acid or of an ester-forming derivative thereof or of a mixture of two or more thereof,(a13) from 0 to 10 mol % of a sulfonate compound or of a mixture of two or more thereof,the sum total of the individual mol %ages being 100,(a2) a dihydroxy compound or an aminoalcohol or a mixture of two or more thereof,the molar ratio of (a1) to (a2) being within the range from 0.4:1 to 2.5:1,(a3) from 0.01 to 10% by weight, based on mixture (a1), of a chain extender from the group consisting of the diisocyanates, divinyl ethers and the 2,2'bisoxazoline of the ##STR8## where R.sup.1 is a single bond, a (CH.sub.2).sub.q alkylene group, where q is 2, 3 or 4, or a phenylene group, or of a mixture of two or more thereof, and(a4) from 0.01 to 20% by weight, based on mixture (a1), of a compound having at least three groups capable of ester formation or of a mixture of two or more thereof,whereinthe repeat units derived from (a11) and (a12) form a random distribution, the copolyester has a viscosity number within the range from 5 to 450 ml/g (measured in 50/50 w/w o-dichlorobenzene/phenol at a concentration of 0.5% by weight of copolyester at 25.degree. C.).