Abstract:
Se divulga una composición de resma termoplástica excelente en fluidez y características mecánicas. Una forma de realización preferida de esta composición de resina termoplástica es también excelente en propiedad de bajo pandeo, transmisión de láser y soldadura por láser. También se divulga un artículo moldeado de tal una composición de resma termoplástica. De manera específica se divulga una composición de resina termoplástica obtenida mediante mezclar físicamente 0.1-4 partes por peso de un compuesto multifuncional (B) teniendo tres o mas grupos funcionales, donde por lo menos una estructura terminal teniendo un grupo funcional incluye una unidad de óxido de alquileno, por 100 partes por peso de una resina termoplástica (A). La resina termoplástica (A) de preferencia se compone de una o mas resinas seleccionadas a partir de resinas de poliéster y resinas de policarbonato. También divulgado de manera específica es un artículo moldeado de tal una composición de resma termoplástica.
Abstract:
The present invention is directed to a method for producing a polylactic acid resin, including the step of subjecting a crystallizedprepolymer, which is a prepolymer including a lactic acid unit as a main component, and has an optical purity (Ea) of 60 to 94%, a weight average molecular weight of 5,000 to 100,000, and a crystal melting enthalpy (”Hma) of 4 to 50 J/g, to solid phase polymerization. According to the present invention, it is possible to obtain a polylactic acid resin which is excellent in moldability upon melt processing and drawdown resistance upon melt processing, and is also excellent in hydrolysis resistance.
Abstract:
There is provided a polylactic acid resin composition, comprising 0.15 to 0.90 parts by weight of an organic nucleating agent (B) in addition to 100 parts by weight of a polylactic acid resin (A) comprised of a poly-L-lactic acid component and a poly-D-lactic acid component. The polylactic acid resin composition satisfies the following (i) to (v): (i) amount of a linear oligomer of L-lactic acid and/or D-lactic acid is equal to or less than 0.3 parts by weight (ii) rate of weight-average molecular weight retention is equal to or greater than 70% after the polylactic acid resin composition is retained in a closed state at 220°C for 30 minutes; (iii) degree of stereocomplexation (Sc) exceeds 80%; (vi) stereocomplex crystal melting heat quantity ”Hmsc is equal to or greater than 30 J/g; and (v) cooling crystallization heat quantity (”Hc) is equal to or greater than 20 J/g.
Abstract:
Provided are a thermoplastic resin composition comprising 1 to 100 parts by weight of a flame retardant (B) containing any one or more flame retardants (B-1) selected from melamine phosphate, melamine pyrophosphate, and melamine polyphosphate and any one or more flame retardants (B-2) selected from piperazine phosphate, piperazine pyrophosphate, and piperazine polyphosphate, based on 100 parts by weight of a thermoplastic resin (A) comprising polylactide resin, wherein, according to transmission electronic microscopy, the major axis of the largest particle of the flame retardant (B) in the composition is not more than 10 µm, and the ratio of the number of particles of the flame retardant (B) having a major axis of not more than 3 µm relative to the number of particles of the flame retardant (B) per an area of 1,000 µm 2 is 70% or more; a molded article made of the thermoplastic resin composition; and a thermoplastic resin composition having excellent molding processability, shock resistance, and heat resistance, in particular, excellent flame retardancy, and a molded article made of the same.
Abstract:
Disclosed are a resin composition comprising a polylactic acid resin and a polyacetal resin, and such a resin composition in which the polylactic acid resin and the polyacetal resin are kept miscible with each other. The resin composition has good moldability, workability, mechanical properties, heat resistance and transparency, and may be worked into moldings, films and fibers for practical use.
Abstract:
By controlling the electrical conductivity of a diol composition, a polyester material, at 0.6 mS/m to 30 mS/m, and, preferably, controlling the pH of the diol composition at 5 to 7.5, the thermal weight loss rate of a polyester is reduced, and, consequently, a polyester with improved mechanical properties and molding stability as well as excellent color tone is provided.
Abstract:
The present invention provides: a flame-retardant thermoplastic polyester resin composition which provides a molded article having excellent tracking resistance and excellent mechanical characteristics, while maintaining high flame retardancy; and a molded article which is obtained by molding the flame-retardant thermoplastic polyester resin composition. A flame-retardant thermoplastic polyester resin composition of the present invention contains 1-70 parts by weight of two or more (C) phosphorus-containing flame retardants that are selected from the group consisting of (C-1) condensed phosphoric acid esters, (C-2) phosphazene compounds and (C-3) organic metal phosphinates and 1-90 parts by weight of (D) a nitrogen-containing flame retardant per 100 parts by weight of the total of 50-95 parts by weight of (A) a thermoplastic polyester resin and 5-50 parts by weight of (B) a methacrylic resin.