Biodisintegratable composite foils

Patent metadata

Field	Value
Publication number	US-9359526-B2
Application number	US-201414540468-A
Country	US
Kind code	B2
Filing date	Nov 13, 2014
Priority date	Jul 29, 2010
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

The use of an aqueous polyurethane dispersion adhesive is described for producing biodisintegratable composite foils where at least two substrates are adhesive-bonded to one another with use of the polyurethane dispersion adhesive, where at least one of the substrates is a biodisintegrable polymer foil. At least 60% by weight of the polyurethane is composed of diisocyanates, polyesterdiols, and at least one bifunctional carboxylic acid selected from dihydroxycarboxylic acids and diaminocarboxylic acids.

First claim

The invention claimed is:

1. A biodistintegratable composite foil produced by a method, the method comprising:
adhesive-bonding at least one first substrate to at least one second substrate with an adhesive comprising a biodegradable aqueous dispersed polyurethane, thereby forming a biodisintegratable composite foil,
wherein at least one of the at least one first substrate and the at least one second substrate is a biodisintegratable polymer foil, and
at least 60% by weight of the biodegradable aqueous dispersed polyurethane comprises:
(a) a diisocyanate;
(b) a polyesterdiol; and
(c) a bifunctional carboxylic acid selected from the group consisting of a dihydroxycarboxylic acid and a diaminocarboxylic acid,
wherein said biodegradable aqueous dispersed polyurethane exhibits a ratio of gaseous carbon liberated therefrom in the form of CO 2 to a total carbon content of a material of at least 30% after 20 days, and
wherein at most 10% of an original dry weight of said biodisintegratable composite foil is found to be present after aerobic composting for a period of at most 12 weeks in a sieve fraction >2 mm.

2. The biodistintegratable composite foil of claim 1 ,
wherein at least 80% by weight of the biodegradable aqueous dispersed polyurethane is the polyesterdiol.

3. The biodistintegratable composite foil of claim 1 ,
wherein the polyesterdiol comprises from 10 to 100 mol % of a polyesterdiol with a molar mass of from 500 to 5000 g/mol, based on a total amount of the polyesterdiol, and from 0 to 90 mol % of a polyesterdiol having a molar mass of from 60 to 500 g/mol, based on a total amount of the polyesterdiol.

4. The biodistintegratable composite foil of claim 3 ,
wherein the biodegradable aqueous dispersed polyurethane further comprises:
a polyfunctional compound different from monomers a) to c), and
the polyfunctional compound has at least one reactive group selected from the group consisting of an alcoholic hydroxy group, a primary or secondary amino group, and an isocyanate group.

5. The biodistintegratable composite foil of claim 4 ,
wherein the biodegradable aqueous dispersed polyurethane further comprises:
a monofunctional compound differs from monomers a) to c), and
the monofunctional compound has at least one reactive group selected from the group consisting of an alcoholic hydroxy group, a primary or secondary amino group, and an isocyanate group.

6. The biodistintegratable composite foil of claim 3 ,
wherein the biodegradable aqueous dispersed polyurethane further comprises:
a monofunctional compound differs from monomers a) to c), and
the monofunctional compound has at least one reactive group selected from the group consisting of an alcoholic hydroxy group, a primary or secondary amino group, and an isocyanate group.

7. The biodistintegratable composite foil of claim 1 ,
wherein the adhesive further comprises an external crosslinking agent.

8. The biodistintegratable composite foil of claim 7 ,
wherein the external crosslinking agent is at least one selected from the group consisting of an isocyanurate formed from a diisocyanate and having at least two isocyanate groups, a compound having at least one carbodiimide group, a chemically capped isocyanate, an encapsulated isocyanate, an encapsulated uretdione, a biuret, an allophanate, an aziridine, an oxazoline, and an epoxide.

9. A composite foil produced by a method, comprising:
applying a biodisintegratable polymer as at least one first substrate, via extrusion coating to at least one second substrate, and
applying, as an intermediate layer, an adhesive comprising a biodegradable aqueous dispersed polyurethane,
wherein at least 60% by weight of the biodegradable aqueous dispersed polyurethane comprises
(a) a diisocyanate;
(b) a polyesterdiol; and
(c) a bifunctional carboxylic acid selected from the group consisting of a dihydroxycarboxylic acid and a diaminocarboxylic acid,
wherein said biodegradable aqueous dispersed polyurethane exhibits a ratio of gaseous carbon liberated therefrom in the form of CO 2 to a total carbon content of a material of at least 30% after 20 days, and
wherein at most 10% of an original dry weight of said biodisintegratable composite foil is found to be present after aerobic composting for a period of at most 12 weeks in a sieve fraction >2 mm.

10. The composite foil of claim 9 ,
wherein at least 80% by weight of the biodegradable aqueous dispersed polyurethane is the polyesterdiol.

11. The composite foil of claim 9 ,
wherein the polyesterdiol comprises from 10 to 100 mol % of a polyesterdiol with a molar mass of from 500 to 5000 g/mol, based on a total amount of the polyesterdiol, and from 0 to 90 mol % of a polyesterdiol having a molar mass of from 60 to 500 g/mol, based on a total amount of the polyesterdiol.

12. The composite foil of claim 11 ,
wherein the biodegradable aqueous dispersed polyurethane further comprises:
a polyfunctional compound different from monomers a) to c), and
the polyfunctional compound has at least one reactive group selected from the group consisting of an alcoholic hydroxy group, a primary or secondary amino group, and an isocyanate group.

13. The composite foil of claim 12 ,
wherein the biodegradable aqueous dispersed polyurethane further comprises:
a monofunctional compound differs from monomers a) to c), and
the monofunctional compound has at least one reactive group selected from the group consisting of an alcoholic hydroxy group, a primary or secondary amino group, and an isocyanate group.

14. The composite foil of claim 11 ,
wherein the biodegradable aqueous dispersed polyurethane further comprises:
a monofunctional compound differs from monomers a) to c), and
the monofunctional compound has at least one reactive group selected from the group consisting of an alcoholic hydroxy group, a primary or secondary amino group, and an isocyanate group.

15. The composite foil of claim 9 ,
wherein the adhesive further comprises an external crosslinking agent.

16. The composite foil of claim 15 ,
wherein the external crosslinking agent is at least one selected from the group consisting of an isocyanurate formed from a diisocyanate and having at least two isocyanate groups, a compound having at least one carbodiimide group, a chemically capped isocyanate, an encapsulated isocyanate, an encapsulated uretdione, a biuret, an allophanate, an aziridine, an oxazoline, and an epoxide.

Assignees

• Basf Se

Inventors

• Beyers Cornelis Petrus
• Diehl Heiko
• Dahmen Stefan
• Kriegisch Volker
• Licht Ulrike
• Meyer Axel
• Yamamoto Motonori

Classifications

• B32B37/14 Primary

  characterised by the properties of the layers · CPC title

• C08G18/10

  Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step · CPC title

• C08G2230/00

  Compositions for preparing biodegradable polymers · CPC title

• B32B2317/12

  Paper, e.g. cardboard · CPC title

• C08G18/0823

  containing carboxylate salt groups or groups forming them · CPC title