Biodegradable sheet

• US 10,647,093 B2
• Filed: 01/29/2019
• Issued: 05/12/2020
• Est. Priority Date: 10/27/2013
• Status: Active Grant

• Current Assignee: TIPA Corp. Ltd.
• Original Assignee: TIPA Corp. Ltd.
• Inventors: Nissenbaum, Daphna, Neuman, Tal, Pelled, Dori, Garty, Shai, Konieczny, Nili
• Primary Examiner(s): Loewe, Robert S
• Application Number:
  US16/260,138
• Publication Number:
  US 20190152203A1
• Time in Patent Office: 469 Days
• Field of Search: None
• CPC Class Codes: B29C 48/022 characterised by the choice of material
• CPC Class Codes: B29C 48/21 the layers being joined at their surfaces
• CPC Class Codes: B29C 48/92 Measuring, controlling or regulating
• CPC Class Codes: B32B 2250/02 2 layers
• CPC Class Codes: B32B 2250/03 3 layers
• CPC Class Codes: B32B 2250/04 4 layers
• CPC Class Codes: B32B 2250/05 5 or more layers
• CPC Class Codes: B32B 2250/40 Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
• CPC Class Codes: B32B 2255/10 on synthetic resin layer or on natural or synthetic rubber layer
• CPC Class Codes: B32B 2255/205 Metallic coating
• CPC Class Codes: B32B 2262/06 Vegetal fibres
• CPC Class Codes: B32B 2262/062 Cellulose fibres, e.g. cotton
• CPC Class Codes: B32B 2262/065 Lignocellulosic fibres, e.g. jute, sisal, hemp, flax, bamboo
• CPC Class Codes: B32B 2262/067 Wood fibres
• CPC Class Codes: B32B 2262/10 Inorganic fibres layered products comprising a layer of natural mineral fibres B32B19/00
• CPC Class Codes: B32B 2262/101 Glass fibres
• CPC Class Codes: B32B 2262/105 Ceramic fibres
• CPC Class Codes: B32B 2262/106 Carbon fibres, e.g. graphite fibres
• CPC Class Codes: B32B 2262/108 Rockwool fibres
• CPC Class Codes: B32B 2264/06 Vegetal particles
• CPC Class Codes: B32B 2264/067 : Wood particles
• CPC Class Codes: B32B 2264/10 : Inorganic particles
• CPC Class Codes: B32B 2264/104 : Oxysalt, e.g. carbonate, sulfate, phosphate or nitrate particles
• CPC Class Codes: B32B 2264/105 : Metal
• CPC Class Codes: B32B 2264/107 : Ceramic
• CPC Class Codes: B32B 2270/00 : Resin or rubber layer containing a blend of at least two different polymers
• CPC Class Codes: B32B 2307/31 : Heat sealable
• CPC Class Codes: B32B 2307/54 : Yield strength; Tensile strength
• CPC Class Codes: B32B 2307/546 : Flexural strength; Flexion stiffness
• CPC Class Codes: B32B 2307/704 : Crystalline
• CPC Class Codes: B32B 2307/7163 : Biodegradable
• CPC Class Codes: B32B 2307/7244 : Oxygen barrier
• CPC Class Codes: B32B 2307/7246 : Water vapor barrier
• CPC Class Codes: B32B 2307/7265 : Non-permeable
• CPC Class Codes: B32B 2307/73 : Hydrophobic
• CPC Class Codes: B32B 2307/732 : Dimensional properties
• CPC Class Codes: B32B 2439/00 : Containers; Receptacles closures therefor B32B2435/00
• CPC Class Codes: B32B 2439/70 : Food packaging
• CPC Class Codes: B32B 27/08 : of synthetic resin
• CPC Class Codes: B32B 27/22 : using plasticisers
• CPC Class Codes: B32B 27/28 : comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
• CPC Class Codes: B32B 27/306 : comprising vinyl acetate or vinyl alcohol (co)polymers
• CPC Class Codes: B32B 27/36 : comprising polyesters
• CPC Class Codes: B32B 27/365 : comprising polycarbonates
• CPC Class Codes: B32B 7/12 : using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: B65D 65/46 : Applications of disintegrable, dissolvable or edible materials
• CPC Class Codes: B65D 65/466 : Bio- or photodegradable packaging materials
• CPC Class Codes: C08J 2300/16 : Biodegradable polymers
• CPC Class Codes: C08J 2367/02 : Polyesters derived from dicarboxylic acids and dihydroxy compounds; C08J2367/06 takes precedence
• CPC Class Codes: C08J 2367/04 : Polyesters derived from hydroxy carboxylic acids, e.g. lactones C08J2367/06 takes precedence
• CPC Class Codes: C08J 2400/16 : Biodegradable polymers
• CPC Class Codes: C08J 2467/04 : Polyesters derived from hydroxy carboxylic acids, e.g. lactones C08J2467/06 takes precedence
• CPC Class Codes: C08J 5/18 : Manufacture of films or sheets
• CPC Class Codes: C08J 7/042 : with two or more layers, where at least one layer of a composition contains a polymer binder
• CPC Class Codes: C08L 101/16 : the macromolecular compounds being biodegradable
• CPC Class Codes: Y02W 90/10 : Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

Abstract

Disclosed is a biodegradable sheet comprising at least one layer which is a direct contact layer, intended to successfully contact materials, such as liquids, while maintaining the mechanical properties of the sheet and to extend the biodegradable sheet shelf life. The direct contact layer may comprise a hydrophobic polymer selected from poly(epsilon-caprolactone) (PCL) polyhydroxybutyrate (PHB), Polydioxanone (PDO) polyglycolic acid (PGA), polybutylene succinate (PBS), polybutylene succinate adipate (PBSA), poly lactic acid (PLA), polybutylene adipate terphtalate (PBAT), polyhydroxyalkanoates (PHA), such as polyhydroxybutyrates (PHB), polyhydroxyvalerates (PHV), and polyhydroxybutyrate-hydroxyvalerate copolymers (PHBV) or any mixture thereof. The biodegradable sheet may further comprise surface treated nanoclay particles, PVOH grafted with a crosslinker and PBS or PBSA The biodegradable sheet may further include at least one metalized, biodegradable, laminate layer.

Claims

1. A biodegradable sheet, consisting of three layers, wherein a first layer and a third layer are outer layers and a second layer is an internal layer,

wherein said internal layer comprises a first hydrophobic polymer selected from the group consisting of poly(epsilon-caprolactone) (PCL), a polyhydroxyalkanoate (PHA) and a mixture thereof, and a second hydrophobic polymer selected from the group consisting of polybutylene succinate (PBS), polybutylene succinate adipate (PBSA), poly lactic acid (PLA), polybutylene adipate terephthalate (PBAT), polydioxanone (PDO), polyglycolic acid (PGA) and any mixture thereof,

wherein the first hydrophobic polymer is present in said internal layer in an amount of about 20% w/w, and

wherein said first layer or said third layer comprise about 100% w/w PBS or about 100% w/w PBSA.

2. The biodegradable sheet of claim 1, wherein said first layer and said third layer each comprise about 100% w/w PBS.

3. The biodegradable sheet of claim 1, wherein said first layer and said third layer each comprise about 100% w/w PBSA.

4. The biodegradable sheet of claim 1, wherein said third layer comprises about 15%-25% w/w PBSA or PLA, about 50%-60% w/w PBAT or PBS and about 5%-30% PCL and said first layer comprises about 100% w/w PBS or about 100% w/w PBSA.

5. The biodegradable sheet of claim 1, wherein said first layer comprises about 15%-25% w/w PBSA, about 50%-60% w/w PBS and about 20%-30% PCL and said third layer comprises about 100% w/w PBS or about 100% w/w PBSA.

6. The biodegradable sheet of claim 1, wherein said first hydrophobic polymer comprises PCL and said second hydrophobic polymer comprises PLA.