Novel polyesters and their use in compostable products such as disposable diapers
AssigneeE. I. Du Pont de Nemours and Company
InventorRaymond F. Tietz
Life of this patent
Estimating the term…
Abstract
The invention provides novel polyesters, fibers and films, nonwovens from the fibers and disposable products of the polyesters such as diapers from the nonwovens. 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 polyesters are based upon polyethylene terephthalate copolymerized with diethylene glycol and a 5-sulfoisophthalic acid.
Claims11
A fiber and film forming polyester consisting essentially of recurring structural units of the formula ##STR5## wherein R is about 97 to 99.9 mole % para-phenylene and
- about 0.1 to 3 mole % of the sulfonate radical ##STR6## where M is an alkali metal or alkaline earth metal, and
- wherein G is
- about 60 to 80 mole % --CH.sub.2 --CH.sub.2 -- and
- about 20 to 40 mole % --(CH.sub.2).sub.2 --O--(CH.sub.2)hd 2--.
Dependencies are inferred from the claim text.