# US 9,751,285 B2 · Biodegradable sheet

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- Number: US 9,751,285 B2
- Document ID: US9751285B2
- Status: Granted
- Kind: B2
- Application number: 14/407,079
- Filed: 2013-06-13
- Published: 2015-06-25
- Granted: 2017-09-05
- Earliest claimed: 2012-06-13
- Assignees: Tipa Corp. Ltd.
- Applicants: Tipa Corp. LTD
- Inventors: Tal Neuman; Daphna Nissenbaum; Shai Garty; Dori Pelled; Nili Konieczny
- Web page: https://patentgrep.com/patent/US9751285B2

## CPC

- B32B 27/08: of synthetic resin
- B32B 7/10: at least one layer having inter-reactive properties
- B32B 27/18: characterised by the use of special additives
- B32B 27/36: comprising polyesters
- B65D 65/46: Applications of disintegrable, dissolvable or edible materials
- B65D 65/463: {Edible packaging materials}
- B65D 65/466: {Bio- or photodegradable packaging materials}
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- C08F 261/04: on to polymers of vinyl alcohol
- C08G 63/912: {derived from hydroxycarboxylic acids}
- C08K 3/346: {Clay}
- C08K 9/04: Ingredients treated with organic substances {(treated with macromolecular compounds C08K9/08)}
- C08L 101/16: the macromolecular compounds being biodegradable
- B32B 2264/10: Inorganic particles
- B32B 2307/7163: Biodegradable
- B32B 2307/7244: Oxygen barrier
- B32B 2307/7265: Non-permeable
- B32B 2439/70: Food packaging
- B65D 33/2508: {using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor}
- B65D 75/5805: {for tearing a side strip parallel and next to the edge, e.g. by means of a line of weakness}
- B65D 2575/586: with means for reclosing
- Y02W 90/10: Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
- Y10T 428/31667: Next to addition polymer from unsaturated monomers, or aldehyde or ketone condensation product
- Y10T 428/31794: Of cross-linked polyester
- Y10T 428/31797: Next to addition polymer from unsaturated monomers
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Disclosed is a biodegradable sheet comprising at least one layer which comprises a biodegradable polymer and surface treated nanoclay particles or at least one layer which comprises PVOH grafted with a crosslinker and PBS or PBSA or a combination a biodegradable polymer and surface treated nanoclay particles and at least one layer which comprises PVOH grafted with a crosslinker and PBS or PBSA.

## Claims

### Claim 1

A multilayered biodegradable sheet, wherein at least one layer comprises at least one biodegradable polymer and surface treated nanoclay particles, comprising a bridge between the surface treated nanoclay particles and the biodegradable polymer, said bridge comprising a functional moiety having at least two functional sites, wherein at least one of the functional sites is conjugated to the nanoclay particle surface and at least another one of the functional sites is conjugated to the biodegradable polymer; and the nanoclay particles are optionally homogeneously dispersed in the at least one layer.

### Claim 2 (depends on 1)

The multilayered biodegradable sheet according to claim 1, wherein the bridge comprises a first end and a second end and a plurality of functional moieties, each functional moiety having at least two functional sites, wherein at least one of the functional sites is conjugated to the nanoclay particle surface and at least one of the functional sites of a second moiety on the second end of the bridge is conjugated to the biodegradable polymer.

### Claim 3 (depends on 1)

The multilayered biodegradable sheet according to claim 1, wherein the surface treated nanoclay particles are a nanoclay concentrate, wherein the nanoclay concentrate is optionally prepared by ring opening polymerization (ROP) and optionally wherein the ROP includes polymerizing ring bearing monomers selected from L-lactide, D-lactide, D,L-lactide and epsilon-caprolacton or a combination thereof.

### Claim 4 (depends on 1)

The multilayered biodegradable sheet according to claim 1, wherein the surface treated nanoclay particles comprise a step of pretreatment to remove ions adsorbed on the surface of the nanoclay particles.

### Claim 5 (depends on 1)

The multilayered biodegradable sheet according to claim 1, wherein the functional moiety comprises
a) 3-(dimethylamino)-1-propylamine (DMPA), a diisocyanante group, triethoxysilane substituted with an isocyanate group, aminopropyl triethoxysilane or any combination thereof; or
b) a functional group selected from a di-aldehyde selected from gluteraldehyde, diacrylate, meta-acrylate, or di-epoxide, or a diisocyanate group is selected from hexamethylene diisocyanate (HDI), methylene diphenyl diisocyanate (MDI) or toluene diisocyanate (TDI).

### Claim 6 (depends on 1)

The multilayered biodegradable sheet according to claim 1, wherein the sheet comprises 1-30% w/w of a nanoclay concentrate.