NOVEL POLYESTERS AND THEIR USE IN COMPOSTABLE PRODUCTS SUCH AS DISPOSABLE DIAPERS

摘要

The invention provides novel polyesters, fibers and films, nonwovens from the fibers and disposable products of the polyesters such as diapers. The products are degradable under the conditions typically existing in waste composting processes, have low ingredient costs and yet provide strength and toughness properties adequate for end uses such as in disposable diapers. The copolyesters are based upon polyethylene terephthaltate copolymerized with a monomer containing an alkali metal or alkaline earth metal sulfo group, a polyethylene ether, such as diethylene glycol, and include units from aliphatic hydroxyacids selected for their melting points being lower than their decomposition temperatures.