US 5,489,470 A · Biodegradable copolymers and plastic articles comprising biodegradable copolymers

Abstract

The present invention relates to biodegradable PHA copolymers comprising at least two randomly repeating monomer units. The present invention further relates to a plastic article comprising a biodegradable copolymer, wherein the biodegradable copolymer comprises at least two randomly repeating monomer units (RRMU) wherein the first RRMU has the structure ##STR1## wherein R.sup.1 is H, or C.sub.1 or C.sub.2 alkyl, and n is 1 or 2; the second RRMU has the structure ##STR2## wherein R.sup.2 is a C.sub.4 -C.sub.19 alkyl or alkenyl; and wherein at least 50% of the RRMUs have the structure of the first RRMU. The present invention further relates to an absorbent article comprising a liquid pervious topsheet, a liquid impervious backsheet comprising a film comprising a PHA of the present invention and an absorbent core positioned between the topsheet and the backsheet.

Claims5

Dependent claims

An absorbent article comprising:

a) a liquid pervious topsheet;
b) a liquid impervious backsheet comprising a biodegradable copolymer, wherein the biodegradable copolymer comprises at least two randomly repeating monomer units wherein the first randomly repeating monomer unit has the structure ##STR14## wherein R.sup.1 is H, or C.sub.1 or C.sub.2 alkyl, and n is 1 or 2;
the second randomly repeating monomer unit has the structure ##STR15## wherein R.sup.2 is a C.sub.4 -C.sub.19 alkyl or alkenyl;
and wherein at least 50% of the randomly repeating monomer units have the structure of the first randomly repeating monomer unit;
and
c) an absorbent core positioned between the topsheet and the backsheet.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

08/422,009Filed 13 Apr 1995 · continuation

Priority

28 Jan 1994

Granted

6 Feb 1996

Term ends

Not estimatedThe source records don’t support an estimate.

Classification19 codes

A61L 15/26
Containing macromolecular materials: macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated…
A61L 15/62
Use of materials characterised by their function or physical properties: compostable, hydrosoluble or hydrodegradable materials
C08G 63/06
Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds: derived from hydroxycarboxylic acids
C08G 63/08
Derived from hydroxycarboxylic acids: lactones or lactides

Family

Serial187,969Parent of this continuation · filed 28 Jan 1994

Serial247,539Parent of this division · filed 23 May 1994

Serial306,349Parent of this division · filed 15 Sep 1994

Serial364,917Parent of this continuation · filed 28 Dec 1994

Serial247,539Parent of this continuation-in-part

US 5,489,470 AThis patent

From the US filing history. Foreign family members aren’t listed.

Biodegradable copolymers and plastic articles comprising biodegradable copolymers

Life of this patent

Biodegradable copolymers and plastic articles comprising biodegradable copolymers

Life of this patent

Abstract

Claims5