Abstract:
The invention relates to biocompatible, bioabsorbable derivatized non-crosslinked chitosan compositions optionally crosslinked to gelatin/collagen by 1-ethyl-3-[3-dimethylaminopropyl]carbodiimide hydrochloride (EDC) for biomedical use and methods of making and testing such compositions, including a modified acute systemic toxicity test. The compositions comprise derivatized chitosan reacetylated to a degree of N-deacetylation (DDA) of between about 15% and 40%. The compositions are typically bioabsorbed in about 90 days or less and can be made to bioabsorb at differing rates of speed. The compositions are initially soluble in aqueous solution below pH 6.5. The compositions have an acid content that can be adjusted between about 0% (w/w) and about 8% (w/w) to customize the composition for uses that require and/or tolerate differing levels of cytotoxicity, adhesion, composition cohesion, and cell infiltration into the composition.
Abstract:
The present invention relates to a process for preparing a polymer/biological entities alloy, comprising a step of mixing a polymer and biological entities that degrade it, during a heat treatment, said heat treatment being performed at a temperature T above room temperature and said biological entities being resistant to said temperature T, characterized in that said biological entities are chosen from enzymes that degrade said polymer and microorganisms that degrade said polymer.
Abstract:
The present disclosure provides, at least in part, a composition comprising polylactic acid (PLA), poly(butylene succinate) (PBS), and a compostable polyester such as poly(butylene adipate-co-terephthalate) (PBAT). The present compositions may comprises calcium carbonate. The present disclosure provides, at least in part, an article manufactured from present composition, such as a packaging.
Abstract:
A resin composition includes an aromatic polyester resin, a polylactic acid resin, and at least one compound selected from a carbodiimide compound, an epoxy compound, an oxazoline compound, an oxazine compound, and an aziridine compound, wherein the resin composition has only one peak of tan σ obtainable by a viscoelasticity measurement in a temperature range of 60° C. to 90° C.
Abstract:
A poly-3-hydroxyalkanoate resin composition having excellent ductility and transparency, and a molded article thereof. The poly-3-hydroxyalkanoate resin composition includes: a poly-3-hydroxyalkanoate resin (A); and an ethylene-vinyl acetate copolymer resin (B) having a vinyl acetate content of 65 to 95 wt %, wherein the resin (A) and the resin (B) are miscible and a ratio of resin (A)/resin (B) is 90/10 to 55/45 (wt/wt). The molded article is produced using such a poly-3-hydroxyalkanoate resin composition.
Abstract:
A composition for the degradation of plastic in the form of an additive used during the manufacturing of plastic. The composition being comprised of a predetermined amount of heptane, cellulose, methyl rhenium trioxide, butylated hydroxytoluene, and polyphenol oxidase. The additive can be selectively programmed to cause the plastic to begin disintegrating at a predetermined time.
Abstract:
The present invention relates to a material as interpenetrating polymer network (IPN) associating a gel with a co-network of functionalized synthetic polymer and functionalized protein as well as a method of the manufacture of such a material. In particular, the invention relates to a material as interpenetrating polymer network associating a fibrin gel with a co-network of polyvinylalcohol and albumin thank to methacrylate bridges, with improved biodegradability properties.
Abstract:
Novel absorbable polymeric blends having bimodal molecular weight distribution are disclosed. The bimodal blends have a first component that is a polylactide polymer or a copolymer of lactide and glycolide having a bimodal molecular weight distribution, and a second component that is a poly(p-dioxanone) polymer of unimodal or bimodal molecular weight distribution. Alternately, the bimodal blends have a first component that is a polylactide polymer or a copolymer of lactide and glycolide having a unimodal molecular weight distribution, and a second component that is a poly(p-dioxanone) polymer of bimodal molecular weight distribution. The novel polymeric bimodal molecular weight blends provide medical devices having improved dimensional stability. Also disclosed are novel absorbable medical devices made from these novel bimodal polymer blends, as well as novel methods of manufacture.
Abstract:
Polystyrene blends and methods of making polystyrene blends including combining a styrene monomer and an epoxy-functional comonomer to form a combined mixture, subjecting the combined mixture to polymerization to obtain a polystyrene copolymer and combining the polystyrene copolymer with a biodegradable polymer to obtain a polystyrene blend.
Abstract:
Injection molded articles and process of forming the same are described herein. The processes generally include providing a polyolefin including one or more propylene heterophasic copolymers, the polyolefin having an ethylene content of at least 10 wt. % based on the total weight of the polyolefin; contacting the polyolefin with a polylactic acid and a reactive modifier to form a compatiblized polymeric blend, wherein the reactive modifier is produced by contacting a polypropylene, a multifunctional acrylate comonomer, and an initiator under conditions suitable for the formation of a glycidyl methacrylate grafted polypropylene (PP-g-GMA) having a grafting yield in a range from 1 wt. % to 15 wt. %; and injection molding the compatibilized polymeric blend into an article.