Patent ID: 6114042
Filing Date: 2000-09-05
Classification: C08G,C08L,C09D,C09K,Y02A,Y10S,Y10T

Abstract:
A substrate coated with a biodegradable polyester Q2 having a molecular weight (M.sub.n) of from 6000 to 60,000 g/mol, a viscosity number of from 30 to 350 g/ml (measured in 50:50 w/w o-dichlorobenzene/phenol at a concentration of 0.5% by weight of polyester Q2 at 25.degree. C.), and a melting point of from 50 to 170.degree. C., Q2 being obtained by reaction of a mixture consisting essentially of(d.sub.1) from 95 to 99.9% by weight of a polyester P1 having a molecular weight (M.sub.n) of from 5000 to 50,000 g/mol, a viscosity number of from 30 to 350 g/ml (measured in 50:50 w/w o-dichlorobenzene/phenol at a concentration of 0.5% by weight of polyester P1 at 25.degree. C.) and a melting point of from 50 to 170.degree. C., P1 being obtained by reaction of a mixture consisting essentially of(a.sub.1) a mixture consisting essentially offrom 45 to 80 mol % of adipic acid or ester-forming derivatives thereof or mixtures thereof,from 20 to 55 mol % of terephthalic acid or ester-forming derivatives thereof or mixtures thereof, andfrom 0 to 5 mol % of a sulfonate compound,the sum of the individual mole percentages being 100 mol %,(a.sub.2) a dihydroxy compound selected from the group consisting of C.sub.2 -C.sub.6 -alkanediols and C.sub.5 -C.sub.10 -cycloalkanediols, and(a.sub.3) from 0.01 to 5 mol %, based on (a.sub.1), of a compound D having at least three groups capable of ester formation selected from the group consisting of hydroxyl and carboxyl,the molar ratio of (a.sub.1) to (a.sub.2) being from 0.4:1 to 1.5:1,or a polyester PWD or a mixture of P1 and PWD, the polyester PWD having a molecular weight (M.sub.n) of from 5000 to 50,000 g/mol, a viscosity number of from 30 to 350 g/ml (measured in 50:50 w/w o-dichlorobenzenelphenol at a concentration of 0.5% by weight of polyester PWD at 25.degree. C.) and a melting point of from 50 to 170.degree. C., and PWD being obtained by reaction of a mixture consisting essentially of components (a.sub.1) and (a.sub.2),the molar ratio of (a.sub.1) to (a.sub.2) being from 0.4:1 to 1.5:1, with(d.sub.2) from 0.1 to 5% by weight of a diisocyanate C1, and(d.sub.3) from 0 to 5 mol %, based on (a.sub.1), of compound D.