13 results about "PLLA polymer" patented technology

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 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 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.

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.