7. Title: LAMINATED NonWOVEN WEBS DERIVED FROM POLYMERS OF LACTIC ACID AND PROCESS FOR PRODUCING (Latic Acid Polymer Layered Nonwoven Fabrics and Methods of Making Same)
Source: US 5702826 A (Licensing Date: 1997.12.30, Filing Date: 1995.10.12)
Patentee: Fiberweb France FR
Family patents: EP0723043 (B1), JP9169082 (A), FR2725732 (A1)
The invention relates to a composite structure comprising one or more layers of a film, or one or more layers of a nonwoven, and to a method of making the composite structure and a method of bonding between layers.
Traditionally, composite products consist of polyolefins used in diapers, sanitary napkins, protective clothing, surgical masks, clothing curtains, and certain absorbent and filtration products. Polyolefin-made products are very stable, but do not degrade naturally. The large amount of waste generated afterwards causes great pollution to the environment. The use of degradable polymers, especially biodegradable polymers, can solve the problem of environmental pollution.
The polymer disclosed in this invention is derived from the composite structure of polylactic acid PLA and is composed of non-woven fabric and/or film. Each layer has mechanical properties, barrier properties, absorption, filtration, and thermal insulation properties. By choosing polylactic acid-based non-woven and film composite components, the composite structure can be adapted to each application.
The polymer disclosed in this invention is derived from the composite structure of polylactic acid PLA and is composed of non-woven fabric and/or film. Each layer has mechanical properties, barrier properties, absorption, filtration, and thermal insulation properties. By choosing polylactic acid-based non-woven and film composite components, the composite structure can be adapted to each application.
The independent claim of the invention is a composite structure comprising a layer of non-woven fabric and one or more layers selected from a combination of non-woven fabric and film, wherein the combination layer consists of a thermoplastic lactic acid polymer. Among them, lactic acid is selected from D-lactic acid, L-lactic acid and D-, L-lactic acid mixtures thereof, or DL-lactic acid. Non-woven fabrics use filaments with a linear density of 0.05-20 dtex, and the thickness of each film in the composite structure is 0.001-1mm.
8. Title: DEGRADABLE LAMINATE COMPOSITION (Degradable Laminate Components)
Source: US5434004 A (authorization announcement date: 1995.07.18, filing date: 1994.11.08)
Patentee: Mitsui Toatsu Chemicals Inc JP
The invention relates to a laminate component comprising a biodegradable thermoplastic polymer under natural conditions and a regenerated cellulose film (glassine paper), paper, leather, fabric or fiber; in particular, the invention relates to A degradable laminate component includes a polymer composed of a polylactic acid or a lactic acid-hydroxycarboxylic acid copolymer, and cellophane, paper, leather, fabric, or fiber. The laminate components can be used as moisture-proof wrappers, decorations, containers for milk and juice, and other packaging materials. These materials can be degraded under natural conditions after use.
The independent claim of the invention is a degradable laminate product comprising a layer of a thermoplastic, a degradable polymer consisting of polylactic acid having an average molecular weight of 10,000-1,000,000, laminated to a regenerated cellulose film, paper, Above leather or fabric. Polylactic acid is produced from D-lactic acid, L-lactic acid or mixtures thereof. The laminate obtained by the invention is biodegradable in the natural environment, has excellent transparency, moisture resistance, good gloss and high strength.
9. Title: INDUSTRIAL WOVEN FABRIC AND COMPOSITE SHEET COMPRISING SAME (Industrial woven fabrics and composite sheets made therefrom)
Source: US5294469 (Licensing Announcement: 1994.03.15, Filing Date: 1993.06.16)
Patentee: Mitsui Toatsu Chemicals Inc JP
Family patent: DE4320041 (A1)
The industrial fabrics disclosed in this invention are prepared from thermoplastic polymer components wherein the thermoplastic polymer component primarily comprises polylactic acid, or copolymers of lactic acid and other hydroxycarboxylic acids other than lactic acid. The composite sheet disclosed in the present invention is prepared by laminating a film prepared from the above-obtained thermoplastic polymer component on one or both sides of an industrial fabric, or impregnating the industrial fabric with a thermoplastic polymer component. The composite sheet can be used for many industrial materials.
10. Title: Laminated film for packaging material (laminated film for packaging materials)
Source: JP 2005219487 (public date: 2005.08.18, filing date: 2005.01.05)
Applicant: TORAY IND INC
The novelty of the invention: the laminated film comprises a layer (A) having a composition of a crystalline polylactic acid type polymer, and a layer (B) having a crystalline resin component as a main component. The crystallized polymer has a glass transition temperature of ≤55°C, a film heat of fusion crystallization of ≥3 J/g, and a weight change of ≤2% after drying at 90°C for 30 minutes.
Uses: Can be used as food packaging and industrial materials.
Advantages: The laminate film has good elasticity, airtightness, excellent quality stability, storage stability and biodegradability in the natural environment.
11. Title: Poly-lactic acid group film for decorative sheet (polylactic acid film used as a decorative sheet)
Source: JP2005212242 (public date: 2005.08.11, filing date: 2004.01.29)
Applicant: TORAY IND INC
The novelty of the invention is that the polylactic acid-based film is shaped and processed by laminating the main layer (2) on the surface of the layer (1), the layer (1) comprising a polylactic acid-based resin, the main layer (2) comprising acrylic resin, poly Ester resins and/or polyurethane resins are used as structural components; the light transmissivity of the polylactic acid-based film is ≥ 90%.
Uses: As a decorative board used as a building material, interior and exterior materials for electric vehicles, furniture materials, card materials such as switch materials, electrical appliances, trademark decorative plates, labels, bulletin boards, laminated steel plates, ID cards, and game machine templates.
Advantages: The polylactic acid base film has high design property, printability, and good transparency.
Focus Technology: The polylactic acid-type resin has a lubricant content of 0.08% or less, and the polylactic acid-based film has a space surface roughness of at least 0.1-100 nm/1.
12. Title:Polylactic acid group biaxially stretched laminated film
Source: JP 2005193438 A (public date: 2005.07.21, filing date: 2004.01.05)
Applicant: MITSUBISHI PLASTICS IND LTD
The novelty of the invention is that the polylactic acid-based axially stretched laminated film has at least two layers of A and B, each layer includes a polylactic acid-based polymer; and the melting crystallization heat of the polylactic acid-based polymer contained in the A and B layers. 28-44 J/g and 4-23 J/g, respectively.
Uses: Used as packaging materials (bags and boxes) for beverages, foods, chemicals, electrified materials, and hybrid materials, as well as displays for recorded materials, printing plates, vending machines, and game consoles.
Advantages: Polylactic acid-based axially stretched laminate films have excellent water resistance, strength, thermoformability, heat resistance, printability, adhesion to non-solvent inks, and resistance at high temperatures and humidity. Adhesion, no shrinkage deformation.
Stretch Wrap Film roll is widely used in cargo pallet packing, has high tensile strength, puncture resistance, tear resistance. With good re-stretch strength (500% ) and autohesion, Stretch Wrap could pack goods into a whole without collape during transportation, ensuring waterproof, dustproof, breakage-proof and good security. Wrapping Film can be devided into Manual pe stretch film, machine wrapping film and Pre-stretch plastic film. Our Pallet Wrap used LDPE and LLDPE as raw materials, which importing from USA, like Exxonmobil and other petrochemical company. Pallet wrap has many different size, could make customs wrap packing.
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