Patent ID: 6414108
Filing Date: 2002-07-02
Classification: C05F,C08G,C09K,Y02E,Y02P,Y02W

Abstract:
A biodegradable polyether ester P2 produced by the process of reacting a mixture consisting essentially of(b1) a mixture consisting essentially of 20-95 mol % of adipic acid or ester-forming derivatives thereof or mixtures thereof, 5-80 mol % of terephthalic acid or ester-forming derivatives thereof or mixtures thereof, and 0 mol % of a compound containing sulfonate groups, where the total of the individual mole percentages is 100 mol %, (b2) a mixture of dihydroxy compounds (a2), consisting essentially of (a21) from 15 to 99.8 mol % of a dihydroxy compound selected from the group consisting of C2-C6-alkanediols and C5-C10-cycloalkanediols, (a22) from 85 to 0.2 mol % of a dihydroxy compound containing ether functionalities of the formula I HOâ€”[(CH2)nâ€”O]mâ€”Hâ€ƒâ€ƒI where n is 2, 3 or 4 and m is an integer from 2 to 250, or mixtures thereof, where the molar ratio of (b1) to (b2) is chose in the range from 0.4:1 to 1.25:1,(b3) from 0.01 to 100% by weight, based on component (b1), of a hydroxycarboxylic acid B1, and (b4) from 0 to 5 mol %, based on component (b1), of compound D having at least three groups capable of ester formation, where the hydroxycarboxylic acid B1 is defined by the formulae IIa or IIb where p is an integer from 1 to 1500 and r is an integer from 1 to 4, and G is a radical which is selected from the group consisting of phenylene, â€”(CH2)kâ€”, where k is an integer from 1 to 5, â€”C(R)Hâ€”and â€”C(R)HCH2, where R is methyl or ethyl, where the polyether ester P2 has a molecular weight (Mn) in the range from 5000 to 80,000 g/mol, a viscosity number in the range from 30 to 450 g/ml (measured in o-dichlorobenzene/phenol (50150 ratio by weight) at a concentration of 0.5% by weight of polyether ester P2 at 25Â° C.) and a melting point in the range from 50 to 235Â° C.