130 results about "Polyhydroxyalkanoates" patented technology

The invention discloses a polyhydroxyalkanoate water-based barrier coating composition and application, and belongs to the technical field of packaging materials. The composition takes water as a dispersion medium and comprises polyhydroxyalkanoate, a plasticizer, an emulsifier and an inorganic nano filler. The stable emulsion with the volume average particle size of 400-700nm is prepared under specific proportioning and process conditions. After the emulsion is applied to a paper substrate according to the dry film coating weight of 10-12 g / m, the obtained coating shows good comprehensive performance: the oxygen permeability is not higher than 580 cm / m.d, the water vapor permeability is not higher than 290 g / m.d, and the heat sealing strength at 130 DEG C is not lower than 5.0 N / 15 mm. The biodegradable paper-based packaging film does not contain fluorine compounds, can be completely biodegraded, and provides a technical path for sustainable paper-based packaging.

The invention discloses a degradable PHA / PU composite water-based barrier coating and a coated paper product, and belongs to the field of biodegradable polymer coatings. The coating composition comprises a high proportion of polyhydroxyalkanoates as a barrier phase and a bio-based polyurethane as a toughening and heat sealing phase. The key innovation lies in that the cooperation of rigid barrier and flexible functions is realized by accurately regulating and controlling the ratio of two phases and adopting bio-based crosslinking, and the problem that the barrier property, the heat sealability and the flexibility of a traditional single material are difficult to consider at the same time is solved under the condition of low coating amount. The invention provides a full-life-cycle green packaging solution, aims to replace a polyethylene spraying film and a fluorine-containing coating, and has a remarkable application value in the field of food packaging.

The invention belongs to the field of high polymer materials, and discloses a double-trigger programmable degradable PHA composition and a preparation method thereof. A cured film structure formed by the composition sequentially comprises an outer protective layer, a trigger layer and an inner functional layer from outside to inside, wherein the outer protective layer takes polyhydroxyalkanoate as a base material, a reversible cross-linked network is introduced into the outer protective layer, the trigger layer is provided with humidity and ion double-trigger microcapsules, and the inner functional layer is used for bearing functional auxiliaries. The cured film can maintain low permeability and mechanical stability before application. After application, under the synergistic effect of specific moisture and ions, the trigger layer is activated, so that the cured film is subjected to step-type improvement of moisture permeability in a preset time window, and a through hole is formed. And finally, integral disintegration is realized through physical structure failure. The technology can be applied to the fields of seed coating and the like, the activity of a biological base material can be ensured by adopting a low-temperature process with the temperature lower than 50 DEG C, and unification of stable protection before application and on-demand disintegration after application is achieved.

Embodiments of the invention relate generally to methods to generate microorganisms and / or microorganism cultures that exhibit the ability to produce polyhydroxyalkanoates (PHA) from carbon sources at high efficiencies. In several embodiments, preferential expression of, or preferential growth of microorganisms utilizing certain metabolic pathways, enables the high efficiency PHA production from carbon-containing gases or materials. Several embodiments relate to the microorganism cultures, and / or microorganisms isolated therefrom.

A transformed microorganism having an ability to produce a polyhydroxyalkanoate copolymer containing 3-hydroxyalkanoate monomer units having 8 or more carbon atoms includes: an exogenous gene encoding a polyhydroxyalkanoate synthase having an amino acid sequence of any one of SEQ ID NOS: 1 to 4; or an exogenous gene encoding a protein that has an amino acid sequence having a sequence identity of at least 90% with the amino acid sequence of any one of SEQ ID NOS: 1 to 4 and that has polyhydroxyalkanoate synthase activity.

Provided are microporous and tough PHA-based articles having a knot and fibril structure, as well as processes for making these articles using a less than melt processing manner. In some embodiments, a method of forming a porous expanded PHA composite comprising a porous PHA material can include depositing a partially crystalline polyhydroxyalkanoate (PHA) polymer on a substrate at a deposition temperature below a melting temperature of the PHA polymer to form a PHA-substrate composite, and expanding the PHA-substrate composite at a temperature between the glass transition temperature of the PHA polymer and the melting temperature of the PHA polymer.

The present invention relates to a fiber made from a mixture comprising an aliphatic polyester, an aliphatic-aromatic polyester and a polyhydroxyalkanoate, and to a method for producing such a fiber. The invention also relates to a filament suitable for three-dimensional printing, said filament being made from a mixture comprising an aliphatic polyester, an aliphatic-aromatic polyester and a polyhydroxyalkanoate, and to a method for producing such a filament.

A method for preparing purified polyhydroxyalkanoate of the present invention may lower the b* value of a final product more than the conventional value by means of a decolorization step using two types of oxidizing agents sequentially. In addition, in the present invention, by using sodium chlorite (NaClO2), as a primary oxidizing agent, the effect of improving color is significant, and there is almost no decrease in molecular weight.

The invention relates to a material, suitable for additive manufacturing and in particular for fused deposition modeling, wherein said composite material is obtained by fusion of at least two components: - at least one polymer matrix chosen among polyhydroxyalkanoates (PHA), and - at least one auxiliary filler chosen among biobased fillers consisting of biobased particles comprising lignin, cellulose and hemicellulose, wherein said biobased particles have a lignin / hemicellulose mass ratio from 1 to 6. The invention also relates to an additive manufacturing process and a product obtained by an additive manufacturing process.

The present invention relates to a method for producing granules comprising a polyhydroxyalkanoate, and granules produced thereby, the method comprising: (1) a step of injecting a raw material comprising a polyhydroxyalkanoate (PHA) and an additive into a twin-screw extruder to form a polyhydroxyalkanoate melt; (2) a step of supplying a polyhydroxyalkanoate melt to a template by means of a gear pump; (3) a step of passing the polyhydroxyalkanoate melt through a template to form a polyhydroxyalkanoate melt line; and (4) a step of cutting and crystallizing the polyhydroxyalkanoate melt wire in an underwater pelletizer to form pellets.

A polyhydroxyalkanoate copolymer mixture is produced by culturing a microorganism. The mixture contains: a fraction (I) that contains a polyhydroxyalkanoate copolymer having 3-hydroxybutyrate structural units and 3-hydroxyhexanoate structural units and that has an average 3-hydroxyhexanoate content of 9 to less than 20 mol %; and a fraction (II) that contains a polyhydroxyalkanoate having 3-hydroxybutyrate structural units and that has an average 3-hydroxyhexanoate content of 0 to 8 mol %. The weight percentage of the fraction (II) in the polyhydroxyalkanoate copolymer mixture is 45% or more.

A process for producing polyhydroxyalkanoates (PHA) is provided. The process comprises: providing a waste stream comprising lignocellulosic materials; adding an calcium-containing mineral to the waste stream; heat-treating the waste stream in the presence of the calcium-containing mineral, to obtain a treated waste stream; fermenting at least one strain of PHA-producing microorganism in a culture medium comprising the treated waste stream as a carbon source, to produce the PHA; and extracting the PHA from the PHA-producing microorganism.

The present invention relates to novel carbodiimides, to a process for their production, and to the use of the novel carbodiimides in ester-based polyols, in polyethylene terephthalate (PET), in polybutylene terephthalate (PBT), in polytrimethylene terephthalate (PTT), in copolyesters, in thermoplastic polyester elastomers (TPE E), in ethylene vinyl acetate (EVA), in polylactic acid (PLA) and / or in PLA derivatives, in polybutylene adipate terephthalate (PBAT), in polybutylene succinate (PBS), in polyhydroxyalkanoates (PHA), in blends, in triglycerides, in thermoplastic polyurethanes, in polyurethane elastomers, in PU adhesives, in PU casting resins, for PU coatings or in PU foams as stabilizers.

The present invention concerns a composition for a horticultural pot comprising a solid residue of digestate from methanization and / or a solid residue from composting and a biodegradable polymer chosen from polyhydroxyalkanoates (PHA), its preparation and its use in the manufacture of such a pot.

The technology described herein is directed to engineered chemoautotrophic bacteria and methods of producing sustainable biomolecules. In several aspects, described herein are engineered bacteria and corresponding methods, compositions, and systems for the production of products such as polyhydroxyalkanoates (PHA), sugar feedstocks, and lipochitooligosaccharide (LCO) fertilizers.

A genetically engineered strain of Pseudomonas is provided, which is capable of metabolizing lactose as a sole carbon source in the production of polyhydroxyalkanoates (PHAs). A method of engineering microorganisms and a method of PHA production are also provided, wherein lactose is used as a sole carbon source.

The present invention relates to a composition for electrode active material, and an electrode and secondary battery comprising same, the composition comprising an electrode active material, a binder, and a conductive material, wherein the binder contains polyhydroxyalkanoate (PHA). By containing polyhydroxyalkanoate (PHA) as a binder, the composition for electrode active material: can further improve adhesion between active materials and between an active material and an electrode current collector; has excellent oxidation resistance and is electrochemically stable; and may achieve the long lifespan, high capacity, and high power output of secondary batteries even if the binder is used in a small amount, thereby enabling the use thereof not only in a battery cell that is used as a power source for small devices, but also in the unit cell of medium and large-sized battery modules comprising multiple cells.

A biopolymer such as poly(gamma glutamic acid) 100, bacterial cellulose (200) and poly(hydroxyalkanoates) (300) synthesised from a biowaste substrate 102, (204, 304) comprising at least one of: a cell

According to an example aspect of the present invention, there is provided A method for producing polyhydroxyalkanoates. The method comprises the steps of: converting carbon dioxide to one or more organic compound(s), contacting at least part of the one or more organic compound(s) with a microbial monoculture and a fermentation medium to form a fermentation mixture, and producing at least one polyhydroxyalkanoate from the fermentation mixture.

The invention relates to a method for rapidly synthesizing polyhydroxyalkanoate based on segmented feeding oxygen-limiting mixed flora, and belongs to the technical field of solid waste resource utilization. According to the method disclosed by the invention, the functional flora is obtained from the activated sludge through a limited oxygen condition and a feeding mode of separately adding the carbon source and the nutrient solution, so that the synthesis rate of the polyhydroxyalkanoate in a traditional sequencing batch reaction device is effectively improved. In addition, the stability of the polyhydroxyalkanoate synthesized by the functional flora is verified by prolonging the culture time, and the result shows that the polyhydroxyalkanoate can be rapidly and stably synthesized by the functional flora screened under the limited oxygen condition in a sectional feeding mode. The method not only improves the synthesis efficiency of polyhydroxyalkanoate and reduces the production cost, but also has important industrial application value. Through further optimization and large-scale application, the method is expected to play a key role in the fields of environmental protection and bioplastic production.

A process for producing polyhydroxyalkanoates, comprising the steps of: fermenting production medium comprising pongamia oil using bacteria from the Cupriavidus, Burkholderia, or Alcaligenes genera capable of producing polyhydroxyalkanoates; wherein the pongamia oil is extracted from the seeds of Pongamia species and clarified by filtering before the crude, unprocessed pongamia oil is added to the production medium; and extracting the polyhydroxyalkanoates comprising a homopolymer comprising a 3-hydroxybutyrate (3HB) unit amongst other sole PHB polymers from within the bacteria.

The invention provides a method for improving the molecular weight of polyhydroxyalkanoates (polyhydroxyalkanoates, called PHA for short) synthesized by microorganisms, and relates to a method for improving the molecular weight of the polyhydroxyalkanoates (polyhydroxyalkanoates, called PHA for short). By knocking out or knocking down endogenous (intracellular) carboxylesterase, lipase, esterase, thioesterase and PHA degrading enzyme genes of bacteria for synthesizing PHA, the molecular weight of various synthesized PHA is obviously improved. The method has universality for improving the molecular weight of various PHAs synthesized by different species of bacteria, the mechanical property of the PHA can be improved by improving the molecular weight of the PHA, and new performance is provided for expanding the application of the PHA.

To provide a poly(3-hydroxyalkanoate)-based resin-containing fiber capable of yielding a fiber structure that is hard to tear.SOLUTION: The present invention provides a fiber comprising a resin composition, the resin composition comprising a poly(3-hydroxyalkanoate)-based resin and a polylactic acid-based resin, wherein the content of the polylactic acid-based resin is 40-70 pts.wt. per 100 pts.wt. in total of the poly(3-hydroxyalkanoate)-based resin and the polylactic acid-based resin, and the weight average molecular weight of the polylactic acid-based resin is 20,000-120,000.SELECTED DRAWING: None

The present disclosure relates to a polymeric composition having an amorphous polyhydroxyalkanoate (PHA) and a polymer, and uses thereof.

A poly(hydroxyalkanoate) composition having a bimodal molecular weight distribution. The composition includes a first portion and a second portion of poly(hydroxyalkanoate). The first portion has a first weight-average molecular weight, and the second portion has a second weight-average molecular weight that is at least 50% less than the first weight-average molecular weight. The poly(hydroxyalkanoate) is composed of at least 10 mol% of 3-hydroxypropionate monomer repeat units. A method for preparing the composition is also disclosed.

This invention discloses a biodegradable, highly bioactive magnesium bone particle, its preparation method, and its applications, belonging to the field of biomedical materials technology. Using magnesium bone particles as a matrix, an active composite coating layer comprising biodegradable polymer components and inorganic phase components is formed on its surface to construct biodegradable, highly bioactive magnesium bone particles. The biodegradable polymer components are one or more selected from polycaprolactone, polylactic acid, polylactic-co-glycolic acid copolymer, polyhydroxyalkanoates, chitosan, and their derivatives; the inorganic phase is one or more selected from hydroxyapatite, titanium dioxide, calcium phosphate materials, and combinations thereof. The preparation method includes magnesium bone particle matrix preparation, active composite layer slurry preparation, magnesium bone particle coating, and post-treatment. The prepared biodegradable, highly bioactive magnesium bone particles exhibit good degradation regulation performance and excellent bioactivity, and can be used in bone tissue engineering, bone defect repair, and scaffold filling fields.

The invention discloses a self-emulsifying bio-based polyester stabilized multi-class bio-based polymer water-based emulsion as well as a preparation method and application thereof, and belongs to the technical field of bio-based high polymer materials and water-based resin. According to the preparation method disclosed by the invention, a dual-interface synergistic stabilization mechanism is constructed by adopting the self-emulsifying bio-based polyester containing furandicarboxylic acid and the rosin-based component, so that efficient emulsification and interface compatibility of various hydrophobic bio-based film-forming polymers such as polyhydroxyalkanoate and polylactic acid are realized. The emulsion prepared by the invention has excellent storage stability and machining adaptability, maintains extremely high bio-based content and extremely low volatile organic compound residue while remarkably improving the water resistance, oil resistance and gas barrier property of a paper-based coating, and completely meets the safety standard of food contact-grade materials. According to the preparation process, the microstructure of dispersed phase particles is accurately regulated and controlled through phase inversion and high-pressure homogenization, and an ideal green coating solution is provided for high-performance environment-friendly paper-based packaging.

Provided is a method for manufacturing an extruded molded article, which can stably and continuously manufacture a PHA extruded molded article using a polyhydroxyalkanoate (PHA) powder granulate. 【Solution means】The method for manufacturing an extruded molded article includes extruding polyhydroxyalkanoate (PHA) using an extruder. The extrusion molding includes melting a powder granulate containing PHA powder at a plasticizing melting temperature T P (unit: °C) to obtain a melt, extruding the melt from a die, and cooling and solidifying the extruded melt. The plasticizing melting temperature T P is represented by formula (1) T M -10 < T P ≤ T M + 20 (1) (wherein T M (unit: °C) represents the highest melting peak temperature observed in differential scanning calorimetry in which the powder granulate is heated from room temperature at a rate of 10 °C / min in a nitrogen atmosphere.) is satisfied.

Provided is a thermoplastic resin composition containing: 80 to 99.9 parts by weight of a thermoplastic resin (A); and 0.1 to 20 parts by weight of crosslinked resin particles (B) containing a polyhydroxyalkanoate resin and having a gel fraction of 50% or more. The total amount of the thermoplastic resin (A) and the crosslinked resin particles (B) is 100 parts by weight. The polyhydroxyalkanoate resin may be a poly(3-hydroxyalkanoate) resin. The crosslinked resin particles (B) may have a volume mean diameter of 0.1 to 10 μm. The thermoplastic resin composition can be processed into a molded article.