Molded articles having a decorative effect include at least 75% by weight neutralized acid copolymer. The molded articles include from 0.1% to 5% by weight polyamide-based pigment masterbatch. The polyamide-based pigment masterbatch includes from 30% to 95% by weight polyamide and from 5% to 70% by weight of a first pigment associated with the polyamide. The molded articles further include from 0.1% to 5% by weight of a second pigment derived from a liquid-based pigment masterbatch; and from 0.1% to 0.7% by weight of oil-based carrier derived from the liquid-based pigment masterbatch. Methods for preparing the molded articles include dry blending a neutralized acid copolymer, a polyamide-based pigment masterbatch, and a liquid-based pigment masterbatch to form an initial mixture; feeding the initial mixture to an injection molding apparatus; and molding the initial mixture with the injection molding apparatus to form the molded article.

The disclosure concerns methods for molding a polycarbonate containing plastic, the method including: (a) injecting a composition into a mold, the composition including (i) about 49 wt % to about 97.9 wt % of polycarbonate, (ii) about 2.0 wt % to about 50 wt % of a polycarbonate-polysiloxane copolymer, and (iii) about 0 wt % to about 1.0 wt % of at least one release agent; and (b) releasing the composition from the mold. The mold includes at least one draft angle of about 0.1 degrees to about 7 degrees. The polycarbonate blend includes a melt flow volume rate (MVR) of at least about 25 cm3/10 min as measured according to ISO 1133 at 300° C. and 1.2 kg.

In an embodiment, a method for the manufacture of an injection molded article in an injection mold comprises at least one flow length of at least 50 cm, the flow length being defined as the shortest distance between a point of injection in the mold and an inner mold wall, the method comprising injection molding a polycarbonate composition comprising an aromatic polycarbonate, from 0.01 wt. % to 0.30 wt. % based on the weight of the polycarbonate composition of an epoxy additive having at least two epoxy groups per molecule, and from 0.01 wt. % to 0.30 wt. % based on the weight of the polycarbonate composition of a phenolic diphosphite derived from pentaerythritol.

The present invention relates to heterophasic polypropylene compositions comprising a propylene homo- or copolymer forming a crystalline fraction as a matrix and an amorphous propylene ethylene elastomer as a soluble fraction dispersed in said matrix. The heterophasic polypropylene compositions further comprise an elastomeric ethylene/alpha-olefin random copolymer. The heterophasic polypropylene compositions have a well-balanced relation between stiffness and impact strength, low volatile and semi-volatile emissions and good processability.

A casing member for an in-vehicle camera, obtained by injection molding a resin composition that comprises 100 to 300 parts by mass of a total of a fibrous inorganic filler and a non-fibrous inorganic filler to 100 parts by mass of a polyarylene sulfide resin and has a content of an elastomer of 10% by mass or less, and satisfying the following conditions (A) and (B). (A) When a molded product of a predetermined shape is injection molded using the resin composition under predetermined conditions, an absolute value of (shrinkage rate in a direction perpendicular to a flow direction)−(shrinkage rate in the flow direction) is 0.5% or less. (B) A water absorption rate of a molded product of a predetermined shape that is injection molded using the resin composition under predetermined conditions is 0.3% or less when subjected to a predetermined hot water immersion test.

A method of filling a microcavity with layers of a polymer material includes the following steps: (A) estimating a current vertical position of a bottom of the microcavity (current bottom position); (B) lowering the capillary tube into the microcavity towards the current bottom position; (C) dispensing a polymer composition from a tube outlet of the capillary tube under a dispensing applied pressure until the polymer composition substantially fills the microcavity; (D) curing a work piece including the microcavity and the polymer composition in the microcavity to obtain a current layer of the polymer material; and (E) repeatedly executing steps (A), (B), (C), and (D), until the layers of the polymer material have substantially filled the microcavity.

An improved method for obtaining high fiber volume fraction, long fiber injection molded articles is provided. According to one embodiment, the method includes forming an injection molding feedstock by cutting pre-impregnated fiber-reinforced tape into platelets. The platelets can be coated with a thin layer of polymer to allow sliding of the platelets with respect to each other at the early stages of plastication, rather than forcing relative motion of fibers with respect to each other. The method can further include the dispersion of material only in the final stages of the injection molding screw to promote gentle motion of the feedstock at the earlier stages of the plastication process. The method allows improvement of mechanical properties of articles manufactured with equipment and techniques that are prevalent in high volume automotive and consumer industries.

A machine including a mold which delimits an overmolding cavity, for receiving a hollow portion of a bi-material part, cooling means along the overmolding cavity, a core positionable inside the hollow portion and containing heating means for bringing the core to a heating temperature higher than 150° C., and an injector injecting an overmolding material, formed by the core and the hollow portion, for forming an inner portion of the bi-material part. In order to obtain the overmolded inner portion even if the hollow portion has poor heat resistance, the cooling means maintain the overmolding cavity at a cooling temperature lower than 110° C. while the core is brought to the heating temperature, while the overmolding material has been injected by the injector into the overmolding cavity.

A propylene polymer composition includes a propylene homopolymer (A) having an intrinsic viscosity [η] measured in a tetralin solvent at 135° C. in the range of 7 to 12 dl/g, a propylene polymer (B) having an intrinsic viscosity [η] in the range of not less than 0.21 dl/g and less than 0.54 dl/g, and having a proportion of a component eluted at a temperature of not more than −20° C. in TREF in the range of not more than 3.5 mass %, and a propylene polymer (C) having an intrinsic viscosity [η] in the range of not less than 0.54 dl/g and less than 2.6 dl/g, wherein the content of (A) is 0.5 to 47.5 mass %, the content of (B) is 5 to 95 mass % and the content of (C) is 2.5 to 85.5 mass %, based on the total of (A), (B) and (C).

A polyphenylene sulfide resin composition for automotive cooling parts contains, with respect to 100 parts by weight of a polyphenylene sulfide resin (A): 30 to 110 parts by weight of glass fibers (B); and 0.1 to 3 parts by weight of a silane compound (C) having a functional group selected from an amino group and an isocyanate group. In this polyphenylene sulfide resin composition, the PPS resin (A) has a number-average molecular weight of 7,000 to 14,000, and gives a residue amount of 2.0 to 5.0% by weight when dissolved in 20-fold amount by weight of 1-chloronaphthalene at 250° C. for 5 minutes and subsequently subjected to heat pressure filtration through a PTFE membrane filter having a pore size of 1 μm.