18 results about "PLLA polymer" patented technology

The present application relates to degradable extrusion webs, composites and polymer blend compositions thereof, and uses thereof. A degradable extruded web includes a plurality of interconnected strands, at least a portion of the strands being made from a polymer blend comprising a polylactic acid polymer composition, a polybutylene succinate, and a degradation additive comprising a degradation agent in a carrier resin. The present disclosure also relates to turf and methods of making turf using such degradable extrusion webs.

An article is described comprising a first film layer comprising polylactic acid polymer (semicrystalline polylactic acid polymer; amorphous polylactic acid polymer; or a mixture thereof); a second (e.g. polyvinyl acetate) polymer having a Tg of at least 25° C.; plasticizer. In some embodiment, the film layer further comprises inorganic pigment and / or hydrolysis stabilizer. In other embodiments, the film has a net melting endotherm, ΔHnm1, of less than 10 J / g. Also described are methods of making a graphic film.

A sterilized PLA-collagen scaffold comprising animal collagen and a method for preparing a sterilized scaffold for medical use, the method comprising the steps of:i) Loading animal collagen to a fiber mesh containing fibers of polylactide polymer or copolymer (commonly denoted PLA) to obtain a PLA-collagen scaffold,ii) Drying the PLA-collagen scaffold obtained from step i),iii) Sterilizing the PLA-collagen scaffold obtained from the drying step ii) to obtain the sterilized scaffold.The sterilized scaffold obtained has improved biomechanical and physical properties compared with an unsterilized scaffold.

The application discloses a kind of nanofiber wound dressings formed by spraying under short distance and preparation method, comprising the following steps: S1, preparation of polymer solution: PLGA polymer, PLLA polymer and solvent are mixed uniformly to obtain polymer solution, wherein the mass ratio of PLGA polymer, PLLA polymer and solvent is 4-8:1-3:89-95, different spraying distance corresponds to different mass ratio;S2, print fiber in situ: the polymer solution prepared in step S1 is printed fiber using solution spinning, wherein the spraying distance is less than or equal to 10 cm, the spraying air pressure is 125-200kpa, different spraying distance corresponds to different spraying air pressure.The application not only can realize the formation of nanofiber wound dressings by spraying under short distance, and the prepared nanofiber wound dressings have excellent mechanical strength and good adhesion.

The invention provides a poly (butylene succinate) / polylactic acid polymer, which has a structure as shown in the following formula: wherein R1 is alkyl containing 1-3 benzene rings or alkyl containing at least one ester bond; r2 and R3 are respectively and independently selected from alkyl groups of C1-C8; x, m and n are integers not less than 1, and m / (m + n) = 0.0001-0.1. The preparation method comprises the following steps: firstly preparing poly (butylene succinate) with a side group containing a furan substituent and polylactic acid with two ends containing maleimide substituents, and then mixing, melting and extruding the poly (butylene succinate) and the polylactic acid. The polymer has a Diels-Alder bond, and the Diels-Alder bond is subjected to a reverse dissociation reaction at a high temperature, so that the polymer has good repeated processability and degradability, and the problem that a material cannot be repeatedly processed due to permanent crosslinking of a traditional coupling agent is avoided.

Degradable extruded nettings are provided. Degradable extruded nettings may include a plurality of interconnected strands, at least some of the strands being made from a polymeric blend, the polymeric blend including a polylactic acid polymer composition, polybutylene succinate, and a degradation additive, the degradation additive including a degrader in a carrier resin are provided. Grass sod and methods for preparing grass sod using such degradable extruded nettings are also provided.

This useful solution refers to a process for fabricating multilayer polymer nanofibers (4 layers) CPPCBR from chitosan (CS), polyethylene glycol (PEG), and polylactic acid (PLA) polymers, imbued with a mixture of three active ingredients: curcumin (Cur) extracted from turmeric (Curcuma longa), berberine (Ber) extracted from Coscinium fenestratum, and rotundin (Rot) extracted from Stephania sp., using electrospinning combined with gelatin as a binder, performed on a CHITEC 3D printer. CPPCBR multilayer polymer nanofibers are composed of non-toxic, biodegradable, and highly biocompatible polymers: chitosan, polyethylene glycol, and polylactic acid, bonded with a mixture of three active ingredients Cur / Ber / Rot (weight ratio 50:10:40), with a total content of 9% of the three active ingredients in the fiber. CPPCBR multilayer polymer nanofibers (4 layers) can carry four times more active ingredients and provide better release of active ingredients compared to single-layer nanofibers of the same composition. Furthermore, the multilayer structure of CPPCBR multilayer polymer nanofibers obtained from the utility solution process allows for slower and more stable release of the active ingredient compared to single-layer nanofiber structures.

A process for the production of a nonwoven fabric. In particular, it relates to the production of a nonwoven fabric having desirable tactile and haptic as well as mechanical properties, as well as to the nonwoven fabric itself. The process requires the selection of specific polylactic acid polymers and corresponding process conditions.

The invention concerns an article comprising a flame retardant polylactic acid polymer composition which comprises, (i) a polylactic acid polymer substrate; (ii) an effective flame retarding amount of at least one sterically hindered amine; and (iii) an effective flame retarding amount of a phosphorus compound selected from at least one of phosphinate, phosphonate, and alkali metal hypophosphite, wherein the at least one sterically hindered amine is a sterically hindered amine ether or sterically hindered amine ester, and wherein the article is - a film having a thickness of up to 5 mm or - a fibre having a diameter of up to 200 µm or a tape having a thickness of up to 5 mm. In addition, the invention also includes a method of producing the article comprising a flame- retardant lactic acid and the use of the sterically hindered amine ether or sterically hindered amine ester in conjunction with the phosphorus compound for increasing the flame retardancy of the said article.

The present invention relates to a method for synthesising a photosensitive polyethylene glycol (PEG) and methyl ether-poly(d,l-lactide) (PDLLA) polymer by tosylating its organic group. The photosensitive PEG-PDLLA polymer is functionalised by opening the Lactide monomer ring by polymerising and covalently bonding with the alcohol terminal group of PEG via an esterification with the tosylated organic group. The nanopolymer obtained using the disclosed method is suitable for controlled release processes of hydrophobic and hydrophilic active ingredients with specific delivery based on photodynamic therapy. The PEG-PDLLA-based nanopolymer obtained is able to encapsulate hydrophobic and hydrophilic active ingredients, configuring a nanocarrier with amphiphilic filler with high potential for photodynamic therapy. The method in turn involves nanoprecipitation by removing the organic solvent with optimal photo response properties to UV light.

An article is described comprising a first film layer comprising polylactic acid polymer (semicrystalline polylactic acid polymer; amorphous polylactic acid polymer; or a mixture thereof); a second (e.g. polyvinyl acetate) polymer having a Tg of at least 25° C.; plasticizer. In some embodiment, the film layer further comprises inorganic pigment and / or hydrolysis stabilizer. In other embodiments, the film has a net melting endotherm, ΔHnm1, of less than 10 J / g. Also described are methods of making a graphic film.

The present invention discloses a method for preparing a curing agent with biological self-healing ability, which comprises the following steps: first preparing a bacillus pasteurianus liquid, then preparing an endospore solution, then immersing a polyvinyl alcohol fiber in a sodium alginate / endospore solution, taking it out and immediately immersing it in a calcium acetate solution, drying it, obtaining a core fiber with a hydrogel coating, immediately immersing it in a chloroform solution of a polystyrene and polylactic acid polymer blend, drying it, obtaining a coated microbial liquid, pre-mixing urea and glucose, adding them to magnesium phosphate cement, stirring them evenly, then adding the coated microbial liquid, stirring them evenly, and obtaining the product. The present invention adopts phosphate cement as a curing agent, which has the advantages of high strength, short setting time, strong durability, low alkalinity, good biocompatibility, etc. Compared with the curing agent in the prior art, the curing agent not only has a good curing effect, but also has a crack self-healing function, and is particularly suitable for reinforcing foundation soil.

The present disclosure relates to a method of preparing a polylactic acid polymer, and more particularly, to a method of preparing a polylactic acid polymer having a desired high molecular weight by using a specific catalyst in a lactide ring-opening polymerization reaction.

Provided is a laminate containing a polylactic acid polymer, which is excellent in durability and elongation properties. The laminate includes a first resin layer and a second resin layer. The first resin layer contains a polylactic acid polymer, a (meth)acrylic block copolymer, and a plasticizer. A content of the plasticizer is about 1 mass% or more and less than about 10 mass%. The second resin layer contains at least one selected from the group consisting of a (meth)acrylic resin, a resin having a urethane bond, and a vinyl chloride-vinyl acetate copolymer resin. The laminate has a portion to which the first resin layer and the second resin layer are directly applied.

A branched polylactic acid polymer that has improved rheological properties, and a method for preparing same, and provides a branched polylactic acid polymer including a derived unit from a polylactic acid polymer, having an average number of long-chain branches per molecule of 3-10, and having a mass flow rate of 1-20 g / 10 min measured at 190° C. and a load of 2.16 kg in accordance with ASTM D1238 conditions.

The invention discloses a polylactic acid-based material and a preparation method thereof, and belongs to the technical field of controllable degradable bio-based materials. The polylactic acid-based material comprises a polylactic acid polymer, polypeptide and polyethylene glycol ketal, polypeptide is embedded into a main chain of a polylactic acid polymer, and polyethylene glycol ketal and a molecular chain of the polylactic acid polymer form crosslinking and end capping through hydrogen-bond interaction. The polylactic acid-based material is applied to the aspects of short-term, medium-term and long-term use products such as food packaging, 3D printing and electronic appliances, the problem that an existing polyester material cannot keep stable and controllably degraded in the use period at the same time is solved, the polylactic acid-based material can keep stable in the use period, and degradation can be selectively accelerated or slowed down in different environments after the polylactic acid-based material is abandoned.

The present invention relates to a branched polylactide polymer that has been branched to improve its rheological properties, and a method for producing the same. The present invention provides a branched polylactide polymer that contains units derived from a polylactide polymer, has an average number of 3 to 10 long chain branches per molecule, and has a melt mass flow rate of 1 g / 10 min or more and 20 g / 10 min or less, measured at 190°C under a load of 2.16 kg in accordance with ASTM D1238 conditions, and a method for producing the same.

Provided is a nonwoven fabric including fibers formed from a resin composition containing: a polyester resin (A); and a polylactic acid polymer (B). The polyester resin (A) includes: a unit derived from a polyhydric alcohol (a1); and a unit derived from a polyvalent carboxylic acid (a2). The polyhydric alcohol (a1) includes a C4 or higher aliphatic diol (a1-1) having an alkyl group as a branched chain.