WO2022054063A1 - Éléments de fixation compostables - Google Patents

Éléments de fixation compostables Download PDF

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Publication number
WO2022054063A1
WO2022054063A1 PCT/IL2021/051107 IL2021051107W WO2022054063A1 WO 2022054063 A1 WO2022054063 A1 WO 2022054063A1 IL 2021051107 W IL2021051107 W IL 2021051107W WO 2022054063 A1 WO2022054063 A1 WO 2022054063A1
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WO
WIPO (PCT)
Prior art keywords
compostable
bag
pbsa
pla
mixture
Prior art date
Application number
PCT/IL2021/051107
Other languages
English (en)
Inventor
Eli Lancry
Amit HAVIV
Boaz RESHEF
Yaniv DAVID
Original Assignee
Tipa Corp. Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tipa Corp. Ltd filed Critical Tipa Corp. Ltd
Publication of WO2022054063A1 publication Critical patent/WO2022054063A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • 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
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
    • B65D33/2508—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor
    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
    • A44B19/00—Slide fasteners
    • A44B19/10—Slide fasteners with a one-piece interlocking member on each stringer tape
    • A44B19/16—Interlocking member having uniform section throughout the length of the stringer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • 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
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
    • B65D33/2508—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor
    • B65D33/2584—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor characterized by the slider
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • 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
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/46—Applications of disintegrable, dissolvable or edible materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • 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
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/46—Applications of disintegrable, dissolvable or edible materials
    • B65D65/466—Bio- or photodegradable packaging materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/244—All polymers belonging to those covered by group B32B27/36
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/716—Degradable
    • B32B2307/7163—Biodegradable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2435/00—Closures, end caps, stoppers
    • B32B2435/02—Closures, end caps, stoppers for containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/02—Open containers
    • B32B2439/06—Bags, sacks, sachets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/80—Medical packaging
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

Definitions

  • the present invention in at least some embodiments, is directed to compostable fasteners and more specifically to compostable fasteners comprising a mixture of PBAT with PBAS and/or PBSA and to compostable bags comprising such fasteners.
  • biodegradable materials had increased over the past years due to the environmentally beneficial properties of such materials.
  • Such materials are now commonly used in the manufacture of a wide range of products, including various types of plastic bags and other forms of packaging.
  • polymers examples include biopolymers based on polylactic acid (PLA), polyhydroxyalkanoates (PHA), which include polyhydroxybutyrate (PHB), polyhydroxyvalerate (PHV) and polyhydroxybutyrate-hydroxyvalerate copolymer (PHBV), and poly (epsilon-caprolactone) (PCL).
  • PLA polylactic acid
  • PHA polyhydroxyalkanoates
  • PVB polyhydroxybutyrate
  • PV polyhydroxyvalerate
  • PHBV polyhydroxybutyrate-hydroxyvalerate copolymer
  • PCL poly (epsilon-caprolactone)
  • PHB and PLA tend to be strong but are also quite rigid or even brittle. This makes them poor candidates when flexible sheets are desired, such as for use in making wraps, bags and other packaging materials requiring good bend and folding capability.
  • biopolymers such as polybutylene adipate terphtalate (PBAT) are many times more flexible than the biopolymers discussed above and have relatively low melting points so that they tend to be self-adhering and unstable when newly processed and/or exposed to heat.
  • PBAT polybutylene adipate terphtalate
  • biodegradable polymers are also compostable, i.e. are able to degrade in compost, under either industrial or home composting conditions.
  • Resealable storage bags such as those produced by Ziploc®, Glad® and Hefty® are known. Such bags are generally produced using non-biodegradable plastics, such as polypropylene.
  • a compostable fastener for use with a resealable compostable bag, the fastener comprising first and second opposing profiles, wherein: a. said first profile comprises a first base strip and a first interlocking closure element; and b. said second profile comprises a second base strip and a second interlocking closure element configured to reversibly engage with said first interlocking closure element. wherein said fastener comprises a mixture of PBAT with PBS and/or PBSA.
  • a compostable resealable bag comprising a body portion having at least first and second opposing bag walls defining an enclosed portion, each of said first and second opposing bag walls having a respective upper edge which when separated form a mouth, thereby providing access to said enclosed portion, and the compostable fastener as disclosed herein secured to said body portion, wherein said first profile of said fastener is attached to said upper edge of said first bag wall and said second profile of said fastener is attached to said upper edge of said second bag wall.
  • Fig. 1A is a schematic representation of the outer surfaces of a compostable fastener comprising first and second interlocking closure elements in accordance with the principles of the present invention
  • Fig. IB is a schematic representation of the inner surfaces of the compostable fastener of Fig. 1A;
  • Fig. 2A is a schematic representation of a slider element for use with the compostable fastener of Figs. 1A, IB;
  • Fig. 2B is a schematic representation of the compostable fastener of Fig. 1A, IB further comprising the slider element of Fig. 2A;
  • Fig. 3 is a schematic representation of the structure of a compostable fastener in accordance with an alternative embodiment of the present invention.
  • Fig. 4 is a schematic representation of a compostable resealable bag comprising the fastener of Fig. 1.
  • the term “resealable” refers to bags having a fastener which enables the bag to be opened and closed multiple times without causing damage to either the fastener or the bag.
  • bag is intended to includes pouches, sacks and the like.
  • biodegradable as used herein is to be understood to include a polymer, polymer mixture, or polymer-containing sheet that degrades through the action of living organisms in air, water or any combinations thereof within 1 year.
  • Biodegradable polyester degradation is initially by hydrolysis, to eventually break the polymer into short oligomers, and later by microbial degradation, or microbial digestion.
  • Biodegradable material may break down under a variety of conditions, for example under aerobic or anaerobic conditions, in compost, in soil or in water (such as sea, rivers or other waterways).
  • compostable Material which may be degraded in compost is referred to as compostable.
  • compostable refers to a polymer, polymer mixture, or polymer- containing sheet which is degraded by biological processes under aerobic conditions to yield carbon dioxide, water, inorganic compounds and biomass and leaves no visible, distinguishable or toxic residues. Composting of such materials may require a commercial composting facility or the material may be home compostable.
  • home compostable refers to a polymer, polymer mixture, or polymer-containing sheet which is compostable in a home composting container, i.e. at significantly lower temperatures and in the absence of set conditions as compared to those provided in a commercial composting facility, Home composting is usually carried out in significantly smaller volumes than those used for commercial composting, and do not include an industrial shredding process.
  • sheet as used herein is to be understood as having its customary meanings as used in the thermoplastic and packaging arts and includes the term “film”. Such sheets may have any suitable thickness, may be of a single polymer layer or of multiple polymer layers. Such sheets may be manufactured using any suitable method including blown film extrusion and cast film extrusion.
  • compostable fasteners disclosed herein can be used with bags useful for containing therein a wide variety of products or substances, such as semi-solid or liquid substances, including ingestible substances such as food substances, drinks and medicines; toiletries and the like, or articles of clothing, textiles and the like.
  • poly(epsilon- caprolactone), poly(caprolactone) and polycaprolactone are synonymous and the three terms are used interchangeably.
  • polylactic acid and poly(lactic acid) are synonymous.
  • Compostable fastener 10 comprises a first profile 12a and a second, opposing profile 12b.
  • First profile 12a comprises a first base strip 14a and a first interlocking closure element 16a.
  • Second profile 12b comprises a second base strip 14b and a second interlocking closure element 16b configured to reversibly engage with first interlocking closure element 16a.
  • Interlocking closure elements 16a and 16b are formed with respective dimensions which enable interlocking closure element 16b to be reversibly engaged with interlocking closure element 16a.
  • Fastener 10 comprises a mixture of PBAT with PBS and/or PBSA. Hence, in some embodiments, fastener 10 comprises a mixture of PBAT with PBS. In some embodiments, fastener 10 comprises a mixture of PBAT with PBSA. In some embodiments, fastener 10 comprises a mixture of PBAT, PBS and PBSA.
  • fastener 10 comprises a mixture of PBAT with PBS or PBSA
  • fastener 10 is compostable.
  • fastener 10 comprises a mixture of PBAT with PBS
  • fastener 10 is industrially compostable.
  • fastener 10 comprises a mixture of PBAT with PBSA
  • fastener 10 is industrially compostable or home compostable.
  • the mixture comprises PBS at a concentration of about 50-70wt% of said composition and PBAT at a concentration of about 30-40wt% of said composition, such as about 50wt% PBS with about 50wt% PBAT; about 55wt% PBS with about 45wt% PBAT; about 60wt% PBS with about 40wt% PBAT; about 65wt% PBS with about 35wt% PBAT; or about 70wt% PBS with about 30wt% PBAT of said composition.
  • the mixture comprises about 60wt% PBS and about 40wt% PBAT.
  • the mixture comprises PBSA at a concentration of about 50-70wt% of said composition and PBAT at a concentration of about 30-40wt% of said composition, such as about 50wt% PBSA with about 50wt% PBAT; about 55wt% PBSA with about 45wt% PBAT; about 60wt% PBSA with about 40wt% PBAT; about 65wt% PBSA with about 35wt% PBAT; or about 70wt% PBSA with about 30wt% PBAT of said composition.
  • the mixture comprises about 60wt% PBSA and about 40wt% PBAT.
  • the fastener is formed from a composition comprising the mixture of PBAT with PBS or PBSA and further comprising at least one selected from the group consisting of an antioxidant (such as Irganox®, BASF), a shp/antiblock agent (such as erucamide slip agent), and a nucleating agent, and combinations thereof.
  • an antioxidant such as Irganox®, BASF
  • a shp/antiblock agent such as erucamide slip agent
  • nucleating agent a nucleating agent
  • first interlocking closure element 16a comprises at least one longitudinally extending projection 18 and second interlocking closure element 16b comprises at least one longitudinally extending channel 20 configured to receive therein first longitudinally extending projection 18, such that longitudinally extending projection 18 is configured to reversibly engage within longitudinally extending channel 20.
  • channel 20 is defined by a first and a second spaced-apart rail 22a, 22b, respectively.
  • first interlocking closure element 16a comprises one, two, three, four or more spaced longitudinally extending projections 18 and second interlocking closure element 16b comprises a corresponding number of longitudinally extending channels 20.
  • longitudinally extending channel 20 has a rectilinear crosssection. In some embodiments, longitudinally extending channel 20 has a curved crosssection. A cross section of longitudinally extending projection 18 is determined such that longitudinally extending projection 18 is reversibly engageable within longitudinally extending channel 20.
  • first interlocking closure element 16a is caused to engage with second interlocking closure element 16b by manually pressing longitudinally extending projection 18 of first interlocking closure element 16a into longitudinally extending channel 20 of second interlocking closure element 16b; and first interlocking closure element 16a is caused to disengage from second interlocking closure element 16b by manually pulling longitudinally extending projection 18 out of longitudinally extending channel 20.
  • compostable fastener 10 further comprises a slider element 30 as shown in Fig. 2 A, slider element 30 comprising at least two spaced-apart walls 32a, 32b, respectively, defining a cavity 34 for receiving therein first and second profiles 12a and 12b.
  • Fig. 2B shows the compostable fastener of Fig. 1A, IB comprising slider element 30 of Fig. 2A.
  • Slider element 30 is configured to slide along first and second profiles 12a, 12b, respectively, in a first direction to cause first and second interlocking closure elements 16a, 16b to engage; and to slide along first and second profiles 12a, 12b in a direction opposite to the first direction, to cause the first and second interlocking closure elements 16a, 16b to disengage.
  • first and second interlocking closure elements 16a, 16b each comprise a series of spaced-apart projecting teeth 42a, 42b positioned along a longitudinal axis of a respective base strip 14a, 14b.
  • Spaced-apart projecting teeth 42a, 42b are configured such that each non-terminal tooth of said spaced-apart projecting teeth 42a of first interlocking closure element 16b is reversibly engageable within a space 44 formed between a pair of adjacent projecting teeth 42b of second interlocking closure element 16b.
  • first interlocking closure element 16b is caused to engage with second interlocking closure element 16b by manually pressing spaced-apart projecting teeth 42a of interlocking closure element 16a into space 44; and first interlocking closure element 16a is caused to disengage from second interlocking closure element 16b by manually pulling spaced-apart projecting teeth 42a out of space 44.
  • compostable fastener 40 further comprises a slider element 30 comprising at least two spaced-apart walls 32a, 32b, respectively, defining a cavity 34 for receiving therein first and second profiles 12a and 12b.
  • Slider element 30 is configured to slide along first and second profiles 12a, 12b, respectively, in a first direction , to cause first and second interlocking closure elements 16a, 16b to engage; and to slide along first and second profiles 12a, 12b in a direction opposite to the first direction, to cause the first and second interlocking closure elements 16a, 16b to disengage.
  • a compostable resealable bag 60 comprising a body portion 62 having at least first and second opposing walls 64a, 64b respectively defining an enclosed region 66, each of first and second opposing bag walls 64a, 64b having a respective upper edge 68a, 68b, respectively, which when separated form a mouth 70, thereby providing access to enclosed region 66, and the compostable fastener 10 as disclosed herein secured to body portion 62.
  • First profile 12a of compostable fastener 10 is attached to first upper edge 68a of first bag wall 64a and second profile 12b of compostable fastener 10 is attached to second upper edge 68b of first bag wall 64b.
  • body portion 62 comprises at least one layer comprising a compostable 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 terphtalate (PBAT), polydioxanone (PDO), polyglycolic acid (PGA) and any mixture thereof.
  • a compostable polymer selected from the group consisting of poly(epsilon- caprolactone) (PCL), a polyhydroxyalkanoate (PHA) and a mixture thereof
  • PBS polybutylene succinate
  • PBSA polybutylene succinate adipate
  • PLA poly lactic acid
  • PDA polybutylene adipate terphtalate
  • PDO poly
  • body portion 62 comprises at least one layer comprising a mixture of PBSA and PLA.
  • the mixture comprises from about 70wt% to about 90wt% PBSA and from about 10wt% to about 30wt% PLA, such as about 70wt% PBSA with about 30wt% PLA; about 75wt% PBSA with about 25wt% PLA; about 75wt% PBSA with about 25wt% PLA; about 80wt% PBSA with about 20wt% PLA; about 85wt% PBSA with about 15wt% PLA; or about 90wt% PBSA with about 10wt% PLA.
  • body portion 62 comprises at least one layer comprising a mixture of PLA and PCL.
  • the mixture comprises from about 50wt% to about 90wt% PLA and from about 10wt% to about 50wt% PCL, such as about 50wt% PLA with about 50wt% PCL; about 55wt% PLA with about 45wt% PCL; about 60wt% PLA with about 40wt% PCL; about 65wt% PLA with about 35wt% PCL; about 70wt% PLA with about 30wt% PCL; about 75wt% PLA with about 25wt% PCL; about 80wt% PLA with about 20wt% PCL; about 85wt% PLA with about 15wt% PCL; or about 90wt% PLA with about 10wt% PCL.
  • body portion 62 comprises a three layered sheet wherein at least one layer is a first outer layer, the sheet further comprises an inner layer and a second outer layer, wherein the inner layer is located between the first outer layer and the second outer layer.
  • the first outer layer comprises a mixture of PBSA and PLA.
  • the mixture comprises from about 70wt% to about 90wt% PBSA and from about 10wt% to about 30wt% PLA, such as about 70wt% PBSA with about 30wt% PLA; about 75wt% PBSA with about 25wt% PLA; about 75wt% PBSA with about 25wt% PLA; about 80wt% PBSA with about 20wt% PLA; about 85wt% PBSA with about 15wt% PLA; or about 90wt% PBSA with about 10wt% PLA.
  • the first outer layer is selected from the group consisting of PBS, PBSA and combinations thereof.
  • the first outer layer comprises 100wt% PBS.
  • the first outer layer comprises 100wt% PBSA.
  • the first inner layer comprises a mixture of PLA and PCL.
  • the mixture comprises from about 50wt% to about 90wt% PLA and from about 10wt% to about 50wt% PCL, such as about 50wt% PLA with about 50wt% PCL; about 55wt% PLA with about 45wt% PCL; about 60wt% PLA with about 40wt% PCL; about 65wt% PLA with about 35wt% PCL; about 70wt% PLA with about 30wt% PCL; about 75wt% PLA with about 25wt% PCL; about 80wt% PLA with about 20wt% PCL; about 85wt% PLA with about 15wt% PCL; or about 90wt% PLA with about 10wt% PCL.
  • the second outer layer comprises a mixture of PBSA and PLA.
  • the mixture comprises from about 70wt% to about 90wt% PBSA and from about 10wt% to about 30wt% PLA, such as about 70wt% PBSA with about 30wt% PLA; about 75wt% PBSA with about 25wt% PLA; about 75wt% PBSA with about 25wt% PLA; about 80wt% PBSA with about 20wt% PLA; about 85wt% PBSA with about 15wt% PLA; or about 90wt% PBSA with about 10wt% PLA.
  • the first outer layer or the second outer layer comprises a mixture of PLA and PCL.
  • the mixture comprises from about 50wt% to about 90wt% PLA and from about 10wt% to about 50wt% PCL, such as about 50wt% PLA with about 50wt% PCL; about 55wt% PLA with about 45wt% PCL; about 60wt% PLA with about 40wt% PCL; about 65wt% PLA with about 35wt% PCL; about 70wt% PLA with about 30wt% PCL; about 75wt% PLA with about 25wt% PCL; about 80wt% PLA with about 20wt% PCL; about 85wt% PLA with about 15wt% PCL; or about 90wt% PLA with about 10wt% PCL.
  • the first outer layer comprises PBAT. In some embodiments, the first outer layer consists of 100wt% PBAT. According to some embodiments, the second outer layer comprises 100wt% PBSA.
  • the second outer layer comprises PBAT. In some embodiments, the second outer layer consists of 100wt% PBAT.
  • the inner layer comprises PBAT. In some embodiments, the inner layer consists of 100wt% PBAT.
  • a method of producing a compostable fastener as disclosed herein comprising: providing a composition comprising a mixture of PBAT with PBS and/or PBSA; discharging a first portion of said composition through a first extrusion die configured to provide a first extrudate forming said first interlocking closure element; and discharging a second portion of said composition comprising through a second extrusion die configured to provide a second extrudate forming said second interlocking closure element.
  • the method further comprises substantially immediately following said discharging, cooling said extrudate.
  • said cooling comprises introducing said first and said second extrudates into a cold water bath, such as in the temperature range of about 20-30°C, more preferably 15-30°C.
  • the compostable fastener is attached to the bag portion by standard sealing methods as known in the art.
  • the appropriate amounts of the dried PBAT, PBS and PBSA constituent resins were dry-blended, introduced into the feed of a twin screw compounder and then melt extruded to form the resin compositions.
  • the temperature zone settings were 170-175-180-185-190 °C Die at 190 °C, a screw speed of 350 rpm and pressure 15-25 bar.
  • the compounded resin compositions was ground into 1-5 mm diameter pellets using strand pelletizer.
  • fasteners according to the teachings herein were made by extrusion through extrusion dies having suitable shape, configured to extrude a first and a second interlocking closure element.
  • Fasteners were made using an extruder using standard settings as known in the art. Typically the composition comprising the mixture of PBAT with PBS and/or PBSA was feed into the extruder with the temperature zone settings 120-190 °C. The screw speed was set to provide an extrudate having the desired thickness in the usual way.
  • Cooling is preferably carried out by introducing the extrudate into a cold water bath, such as in the temperature range of about 15-30°C.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Bag Frames (AREA)

Abstract

L'invention concerne un élément de fixation compostable destiné à être utilisé avec un sac compostable refermable, l'élément de fixation comprenant des premier et second profils opposés, ledit premier profil comprenant une première bande de base et un premier élément de fermeture à blocage mutuel ; et ledit second profil comprenant une seconde bande de base et un second élément de fermeture à blocage mutuel conçu pour venir en prise de manière réversible avec ledit premier élément de fermeture à blocage mutuel, ledit élément de fixation comprenant un mélange de PBAT avec du PBS et/ou du PBSA.
PCT/IL2021/051107 2020-09-14 2021-09-13 Éléments de fixation compostables WO2022054063A1 (fr)

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GB2014435.8 2020-09-14
GB2014435.8A GB2598783A (en) 2020-09-14 2020-09-14 Compostable fasteners

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4272745A1 (fr) 2022-05-05 2023-11-08 Abdula Kurkayev Composition pharmaceutique pour restaurer des processus physiologiques et des cellules d'organisme

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GB202014435D0 (en) 2020-10-28

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