US 5,849,374 A · Compostable multilayer structures, methods for manufacture, and articles prepared therefrom

Abstract

A compostable multilayer structure in the form of a film, sheet, laminate, and the like, which comprises a core layer having a first surface and a second surface, a first blocking reducing layer covering the first surface of the core layer, and a second blocking reducing layer covering the second surface of the core layer. The core layer contains a lactic acid residue-containing polymer and has a glass transition temperature (T.sub.g) below about 20.degree. C. The first and second blocking reducing layers include a polymer composition of a hydrolyzable polymer and have a T.sub.g above about 50.degree. C. The multilayer structure can be used for preparing bags and wrappers.

Claims29

Dependent claims

A compostable multilayer structure comprising:

(a) core layer having first and second opposed surfaces, said core layer includes lactic acid residue-containing polymer containing at least about 50%, by weight, lactic acid residue units, and an effective amount of plasticizer to provide the core layer with a T.sub.g below about 20.degree. C.;
(b) first blocking reducing layer covering the first surface of said core layer, said first blocking reducing layer having a T.sub.g above about 50.degree. C. and comprising a hydrolyzable polymer;
and
(c) second blocking reducing layer covering the second surface of said core layer, said second blocking reducing layer having a T.sub.g above about 50.degree. C. and comprising a hydrolyzable polymer,
wherein said blocking reduced layers provide reduced blocking compared with said core layer.

2 more elements

Dependencies are inferred from the claim text.

Compostable multilayer structures, methods for manufacture, and articles prepared therefrom

Life of this patent

Compostable multilayer structures, methods for manufacture, and articles prepared therefrom

Life of this patent

Abstract

Claims29