US20010014389A1 - Resin molded article - Google Patents
Resin molded article Download PDFInfo
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- US20010014389A1 US20010014389A1 US08/940,983 US94098397A US2001014389A1 US 20010014389 A1 US20010014389 A1 US 20010014389A1 US 94098397 A US94098397 A US 94098397A US 2001014389 A1 US2001014389 A1 US 2001014389A1
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- molded article
- styrene
- resin
- resin composition
- resin molded
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0013—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fillers dispersed in the moulding material, e.g. metal particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3005—Body finishings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3044—Bumpers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3055—Cars
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T428/251—Mica
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T428/252—Glass or ceramic [i.e., fired or glazed clay, cement, etc.] [porcelain, quartz, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T428/256—Heavy metal or aluminum or compound thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31931—Polyene monomer-containing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31938—Polymer of monoethylenically unsaturated hydrocarbon
Definitions
- the present invention relates to a resin molded article which can prevent formation of a flow mark also known as a flow pattern.
- thermoplastic resin composition a metallic piece, glitter material and a colorant are directly mixed into a synthetic resin.
- the metallic piece such as scaly-aluminum powders, acts as an agent which imparts metallic or pearl tone.
- An example of the glitter material is pearlescent pigment made of mica.
- a molded article using such a thermoplastic resin composition is referred to as a resin molded article.
- a flow mark 8 can occur in some cases at a downstream side of the resin flow, where the downstream side is near a molded article end 92 remote from a gate position 91 at molding.
- Such a flow mark 8 occurs along with the resin flow in a shape substantially similar to the letter “U”, as shown in FIGS. 2 and 3.
- the present inventors have studied extensively to prevent the formation of such a flow mark.
- the present inventors have found that the flow mark is primarily composed of relatively dark portions and relatively light portions, alternating from one to another at a remote location from the gate position, as shown in FIG. 3.
- the present inventors have further discovered that the flow mark generally is not easily formed in a case where the color of the molded article is concentrated, whereas the flow mark is easily formed where the color of the molded article is pale color or colorless.
- the likelihood of the flow mark formation increases also, as conceptionally illustrated in FIG. 4.
- FIG. 5 (B) As shown in FIG. 5 (B), on the surface of the molded article having the flow mark, multiple linear grooves 72 can be observed at the dark portion. On the other hand, at the light portion, such linear groove 72 is not formed. Glitter material 71 is in the interior of the molded article. Also shown in FIG. 5(B) are the flow distortion and breakage at the front portion of the flow, which are formed at the downstream side in the resin flow direction N.
- An object of the present invention is to provide a resin molded article having a uniform glitter feel, which can prevent formation of a flow mark.
- the invention provides a resin molded article obtainable by molding using a thermoplastic resin composition in which glitter material is mixed into a synthetic resin.
- the resin molded article has a molding ratio L/T of not less than 100, wherein T is the thickness of the molded article and L is the distance from a gate position at molding to the remotest position on the molded article.
- the glitter material has an average particle size d of about 10 ⁇ m ⁇ d ⁇ 200 ⁇ m.
- the average particle size d of the glitter material to be added to a synthetic resin is greater than 10 ⁇ m and not less than equal to 200 ⁇ m. For this reason, the glitter does not cause deviation in a molded article at molding, and the distortion and breakage of flow at the front portion of the flow are prevented. Therefore, the flow mark is not formed, thereby giving a uniform glittering feel.
- FIG. 1 is a perspective view of one embodiment of a resin molded article.
- FIG. 2 is a perspective of the prior art resin molded article.
- FIG. 3 is an illustration of the state of flow mark development on (A) the face and (B) the back of the prior art resin molded article.
- FIG. 4 is an illustration of the amount of a glitter material, both concentration and pale color, and the state of flow mark formation in the prior art resin molded article.
- FIG. 5 is (A) an illustration of the resin flow and mechanism on flow mark formation and (B) an illustration of the surface state in the prior art resin molded article.
- the resin molded article has the molding ration L/T of not less than 100.
- examples of such resin molded article are sidemole, garnish lockermole, bumper, pillar, wheel cap, back panel and air spoiler for automobiles.
- This molding ratio of not less than 100 is contrasted to the conventional upper limit of the molding ration L/T which is usually 1000.
- the resin molded article of the present invention is also directed to an injection-molded article, molded by injecting a thermoplastic resin composition containing glitter material into a cavity that has the surface corresponding the external shape of the molded article.
- an average particle size of the glitter material that is added in the thermoplastic resin composition is greater than 10 ⁇ m and less than equal to 200 ⁇ m.
- the average particle size is less than 10 ⁇ m, the glitter material becomes too fine, and the glitter may easily deviate in the resin molded article. Further, the glittering characteristic may be insufficient.
- Examples of the synthetic resin are a single resin, such as polypropylene, polyethylene, polystyrene, acrylonitrile-styreno, acrylonitrile-butadiene-styrene, acrylonitrile-(ethylene-propylene)-styrene, or acrylonitrile-(ethylene-propylene-diene terpolymer)-styrene, acrylonitrile-acrylic-styrene, polyamide, acrylate, polycarbonate, polyacetal, polyvinyl chloride, polyphenylene oxide, polyethylene terephtalate, polybutylene terephtahlate, and ionomer; and a mixture of a plurality of synthetic resins such as polypropylene/polyamide, polycarbonate/acrylonitrile-butadiene-styrene, polyphenylene oxide/polystyrene and the like.
- a single resin such as polypropylene,
- polypropylene is most preferable from the viewpoint of moldability and cost.
- thermoplastic resin composition is a single resin composition containing no inorganic reinforcing agent and no bulking agent and that the content of the glitter material is not less than 0.05 to less than 4 parts by weight relative to the synthetic resin.
- the single resin composition refers to a thermoplastic resin composition in which an inorganic reinforcing agent and a bulking agent is not mixed into a synthetic resin. If necessary, a small amount of a colorant may be added.
- the content of the glitter material is less than 4 parts by weight relative to the synthetic resin.
- a flow mark may form.
- the lower limit is preferably 0.05 part by weight in order to attain the glitter feeling.
- a range of 0.1 to 3 parts by weight is further preferable.
- thermoplastic resin composition is a conjugated resin composition containing an inorganic reinforcing agent and/or a bulking agent, and the content of the glitter material is greater than equal to 0.05 to less than 5 parts by weight relative to the synthetic resin.
- the conjugated resin composition refers to a thermoplastic resin in which the above inorganic reinforcing agent and/or bulking agent are mixed therein. If necessary, a small amount of a colorant is added thereto.
- Examples of the inorganic reinforcing agent are talc, mica, clay, silica, alumina, calcium carbonate, magnesium carbonate, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, calcium hydroxide, magnesium hydroxide, aluminium hydroxide, calcium sulfate, barium sulfate, basic magnesium sulfate, calcium silicate, glass, potassium titanate and aluminate borate in the form of fiber, whisker, flake or powders.
- the glitter material be less than 5 parts by weight.
- a flow mark may form.
- the lower limit is preferably 0.05 part by weight in order to attain a glitter feeling.
- a range of 0.1 to 4 parts by weight is further preferable.
- the glitter material one or more of the following may be used: aluminum powders, brass powders, mica, pearlescent pigment made of mica, flaky glass powders, metal plating powders and metal coating powders.
- Examples of the colorant are organic pigments such as phthalocyanine blue, cyanine green, indanthrene, azo, anthraquinone, perylene, perynone, quinacridone, isoindolinone, thioindigo, dioxazine and the like; inorganic pigments such as titanium oxide, titan yellow, red iron oxide, calcinated pigment, carbon black and the like; and dyes such as phthalocyanine, anthraquinone, perylene, perynone and the like.
- organic pigments such as phthalocyanine blue, cyanine green, indanthrene, azo, anthraquinone, perylene, perynone, quinacridone, isoindolinone, thioindigo, dioxazine and the like
- inorganic pigments such as titanium oxide, titan yellow, red iron oxide, calcinated pigment, carbon black and the like
- dyes such as phthalocyanine, anthr
- Additives such, as antioxidant, ultraviolet-ray absorbing agent, silane coupling agent and the like, and dispersing agents, such as metal soap, low-molecular polyolefin and the like may be added.
- Their content is, but is not limited to, less than equal to 3% by weight according to the conventional method.
- a blend may be directly molded in conjunction with the molding of the resin molded article, such that each component in the thermoplastic resin composition reaches the required amount in the final molded article.
- a compound can be prepared by pre-blending with an extruder to obtain pellets, and this may be used for molding.
- Yet another way is preparing a dry cutter or a master batch to be diluted with a resin for molding.
- the thermoplastic resin composition contains a rubber or an elastomer composition.
- the rubber and the elastomer are ethylene-a-olefin rubbers such as EPM (ehtylene-propylene rubber), EBM (ethylene-propylene rubber), EBM (ehtylene-butene rubber) and EOM (ehtylene-octene rubber) and styrene rubbers such as SBR (styrene-butadiene rubber), SBS (styrene-butadiene-styrene), SIS (sytrene-isopropylene-styrene), SEBS (styrene-ethylene-butylene-styrene), SEPS (styrene-ethylene-propylene-styrene) and the like, as well as hydrogenated ones.
- EPM ehtylene-propylene rubber
- EBM ethylene-propylene rubber
- EBM ehtylene-
- polypropylene polypropylene
- Polypropylene resin containing C2 is ethylene-propylene block resin.
- Table 1 shows a thermoplastic resin composition of a single resin composition.
- the glitter material aluminium powders (A, B and C in Table) or mica pearlescent pigment, i.e., “Pearl Mica” (D in Table), was used.
- the aluminium powders A, B and C have average particle size of 10, 30 or 40 ⁇ m, respectively.
- Pearl Mica D has average particle size of 30 ⁇ m.
- Table 1 shows the average particle size of total glitter materials.
- the size was its average particle size. When two or more kinds were used, it was calculated according to (average particle size of each glitter material) X (content of each glitter material)/(content of total glitter materials).
- the content of the glitter material is an added amount (content) relative to 100 parts by weight of the synthetic resin amount.
- thermoplastic resin composition is a conjugated resin composition, mixing EPM (ethylene-propylene rubber) as a modifier and talc as a bulking agent into polypropylene resin (C2:5 wt. %).
- EPM ethylene-propylene rubber
- talc a bulking agent
- the content of the glitter material is shown parts by weight relative to the conjugated resin composition. Others are the same as those in Table 1.
- cyanine green and magnesium stearate are added as a colorant and dispersing agent, respectively, to the thermoplastic resin composition at an appropriate amount, they are not added depending upon the object to be used.
- Tables 1 and 2 show the flow mark, glitter deviation and glitter feeling regarding the appearance of the above respective resin molded articles.
- Table 1 shows that in a case of the single resin composition, the glitter material having average particle size of 10 ⁇ m (Comparative Example 2) caused a bad glitter deviation and glitter feeling, and the glitter material having average particle size of 30 ⁇ m (Comparative Examples 1 and 3) produced a slight flow mark and also a slight glitter deviation at additional of 4 parts by weight.
- Tables 1 and 2 show that in a case of average particle size d of the glitter material of greater than 10 ⁇ m to not greater than 200 ⁇ m, resin molded articles having much excellent appearance can be obtained by inclusion of the glitter material of not greater than 3 parts by weight in the single resin composition and the glitter material of not greater than 4 parts by weight in the conjugated resin composition.
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- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
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- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
- 1. Field of the Invention
- The present invention relates to a resin molded article which can prevent formation of a flow mark also known as a flow pattern.
- 2. Background Information
- Previously, painting was used in order to give a resin molded article, such as thermoplastic resin, a uniform and aesthetically pleasing appearance like metallic tone and pearl tone having a deep feeling.
- However, such painting required cumbersome and complicated steps, such as degreasing and washing; prime-coating, intercoating and overcoating; and dust removing, drying and stoving of the surface of the molded article. Further, painting required facilities and paints, and the steps required a longer cycle time. Thus, painting was mainly responsible for higher costs.
- To avoid such problems, molding has been carried out using a thermoplastic resin composition. In this thermoplastic resin composition, a metallic piece, glitter material and a colorant are directly mixed into a synthetic resin. The metallic piece, such as scaly-aluminum powders, acts as an agent which imparts metallic or pearl tone. An example of the glitter material is pearlescent pigment made of mica. A molded article using such a thermoplastic resin composition is referred to as a resin molded article.
- As shown in FIG. 2 however, at the molding of the resin molded
article 9, aflow mark 8 can occur in some cases at a downstream side of the resin flow, where the downstream side is near a moldedarticle end 92 remote from agate position 91 at molding. Such aflow mark 8 occurs along with the resin flow in a shape substantially similar to the letter “U”, as shown in FIGS. 2 and 3. - Since the
flow mark 8 deteriorates the decorative effect of the molded article, the present inventors have studied extensively to prevent the formation of such a flow mark. The present inventors have found that the flow mark is primarily composed of relatively dark portions and relatively light portions, alternating from one to another at a remote location from the gate position, as shown in FIG. 3. The present inventors have further discovered that the flow mark generally is not easily formed in a case where the color of the molded article is concentrated, whereas the flow mark is easily formed where the color of the molded article is pale color or colorless. Moreover, as the amount of the glitter material added increases, the likelihood of the flow mark formation increases also, as conceptionally illustrated in FIG. 4. - The present inventor's study of the mechanism of the formation of the flow mark has revealed that the flowing state at the front portion of the flow becomes unstable due to the fact that the rate of the resin flow is reduced at the downstream side in a cavity near an end of the molded article in the flow direction N, as shown in FIG. 5 (A). For this reason,
flow distortion 81 occurs causing thebreakage 82 at the front portion of the flow. The “dark portion” is formed in thebreakage portion 82 where adhesion to the cavity surface is lowered which generates a concave and convex portion on the surface. - As shown in FIG. 5 (B), on the surface of the molded article having the flow mark, multiple
linear grooves 72 can be observed at the dark portion. On the other hand, at the light portion, suchlinear groove 72 is not formed.Glitter material 71 is in the interior of the molded article. Also shown in FIG. 5(B) are the flow distortion and breakage at the front portion of the flow, which are formed at the downstream side in the resin flow direction N. - Subsequently, the present inventors have studied adjustment of injection pressure for a thermoplastic resin composition, adjustment of a rate of the resin flow, and other factors in order to prevent the flow mark from occurring. However, the molding conditions were difficult, and thus obtained no sufficient results.
- An object of the present invention is to provide a resin molded article having a uniform glitter feel, which can prevent formation of a flow mark.
- The invention provides a resin molded article obtainable by molding using a thermoplastic resin composition in which glitter material is mixed into a synthetic resin. The resin molded article has a molding ratio L/T of not less than 100, wherein T is the thickness of the molded article and L is the distance from a gate position at molding to the remotest position on the molded article. The glitter material has an average particle size d of about 10 μm<d≦200 μm.
- According to the present invention, in a resin molded article having the molding ratio L/T of not less than 100, the average particle size d of the glitter material to be added to a synthetic resin, is greater than 10 μm and not less than equal to 200 μm. For this reason, the glitter does not cause deviation in a molded article at molding, and the distortion and breakage of flow at the front portion of the flow are prevented. Therefore, the flow mark is not formed, thereby giving a uniform glittering feel.
- The present invention's objects, features and advantages are elucidated by the following detailed description and drawings.
- FIG. 1 is a perspective view of one embodiment of a resin molded article.
- FIG. 2 is a perspective of the prior art resin molded article.
- FIG. 3 is an illustration of the state of flow mark development on (A) the face and (B) the back of the prior art resin molded article.
- FIG. 4 is an illustration of the amount of a glitter material, both concentration and pale color, and the state of flow mark formation in the prior art resin molded article.
- FIG. 5 is (A) an illustration of the resin flow and mechanism on flow mark formation and (B) an illustration of the surface state in the prior art resin molded article.
- In the present invention, the resin molded article has the molding ration L/T of not less than 100. Examples of such resin molded article are sidemole, garnish lockermole, bumper, pillar, wheel cap, back panel and air spoiler for automobiles. This molding ratio of not less than 100 is contrasted to the conventional upper limit of the molding ration L/T which is usually 1000.
- The resin molded article of the present invention is also directed to an injection-molded article, molded by injecting a thermoplastic resin composition containing glitter material into a cavity that has the surface corresponding the external shape of the molded article.
- In the present invention, an average particle size of the glitter material that is added in the thermoplastic resin composition is greater than 10 μm and less than equal to 200 μm. When the average particle size is less than 10 μm, the glitter material becomes too fine, and the glitter may easily deviate in the resin molded article. Further, the glittering characteristic may be insufficient.
- On the other hand, when the average particle size exceeds 200 μm, the glitter material particles become too large, easily resulting in distortion and breakage of flow at the front portion as described in the prior art. Such a distortion and breakage may lead to formation of a flow mark.
- Examples of the synthetic resin are a single resin, such as polypropylene, polyethylene, polystyrene, acrylonitrile-styreno, acrylonitrile-butadiene-styrene, acrylonitrile-(ethylene-propylene)-styrene, or acrylonitrile-(ethylene-propylene-diene terpolymer)-styrene, acrylonitrile-acrylic-styrene, polyamide, acrylate, polycarbonate, polyacetal, polyvinyl chloride, polyphenylene oxide, polyethylene terephtalate, polybutylene terephtahlate, and ionomer; and a mixture of a plurality of synthetic resins such as polypropylene/polyamide, polycarbonate/acrylonitrile-butadiene-styrene, polyphenylene oxide/polystyrene and the like.
- Among them, polypropylene is most preferable from the viewpoint of moldability and cost.
- It is preferable that the thermoplastic resin composition is a single resin composition containing no inorganic reinforcing agent and no bulking agent and that the content of the glitter material is not less than 0.05 to less than 4 parts by weight relative to the synthetic resin.
- The single resin composition refers to a thermoplastic resin composition in which an inorganic reinforcing agent and a bulking agent is not mixed into a synthetic resin. If necessary, a small amount of a colorant may be added.
- In a case of the single resin composition, it is preferred that the content of the glitter material is less than 4 parts by weight relative to the synthetic resin. When the content exceeds 4 parts by weight, a flow mark may form. The lower limit is preferably 0.05 part by weight in order to attain the glitter feeling. A range of 0.1 to 3 parts by weight is further preferable.
- It is also preferable that the thermoplastic resin composition is a conjugated resin composition containing an inorganic reinforcing agent and/or a bulking agent, and the content of the glitter material is greater than equal to 0.05 to less than 5 parts by weight relative to the synthetic resin.
- The conjugated resin composition refers to a thermoplastic resin in which the above inorganic reinforcing agent and/or bulking agent are mixed therein. If necessary, a small amount of a colorant is added thereto.
- Examples of the inorganic reinforcing agent are talc, mica, clay, silica, alumina, calcium carbonate, magnesium carbonate, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, calcium hydroxide, magnesium hydroxide, aluminium hydroxide, calcium sulfate, barium sulfate, basic magnesium sulfate, calcium silicate, glass, potassium titanate and aluminate borate in the form of fiber, whisker, flake or powders.
- In the conjugated resin composition, it is preferable that the glitter material be less than 5 parts by weight. When the content is 5 parts by weight or more, a flow mark may form. The lower limit is preferably 0.05 part by weight in order to attain a glitter feeling. A range of 0.1 to 4 parts by weight is further preferable.
- As the glitter material, one or more of the following may be used: aluminum powders, brass powders, mica, pearlescent pigment made of mica, flaky glass powders, metal plating powders and metal coating powders.
- Examples of the colorant are organic pigments such as phthalocyanine blue, cyanine green, indanthrene, azo, anthraquinone, perylene, perynone, quinacridone, isoindolinone, thioindigo, dioxazine and the like; inorganic pigments such as titanium oxide, titan yellow, red iron oxide, calcinated pigment, carbon black and the like; and dyes such as phthalocyanine, anthraquinone, perylene, perynone and the like. Additives such, as antioxidant, ultraviolet-ray absorbing agent, silane coupling agent and the like, and dispersing agents, such as metal soap, low-molecular polyolefin and the like may be added. Their content is, but is not limited to, less than equal to 3% by weight according to the conventional method.
- According to the present invention, a blend may be directly molded in conjunction with the molding of the resin molded article, such that each component in the thermoplastic resin composition reaches the required amount in the final molded article. Alternatively, a compound can be prepared by pre-blending with an extruder to obtain pellets, and this may be used for molding. Yet another way is preparing a dry cutter or a master batch to be diluted with a resin for molding.
- It is preferable that the thermoplastic resin composition contains a rubber or an elastomer composition. This can lead to an advantage of improved resistance. Examples of the rubber and the elastomer are ethylene-a-olefin rubbers such as EPM (ehtylene-propylene rubber), EBM (ethylene-propylene rubber), EBM (ehtylene-butene rubber) and EOM (ehtylene-octene rubber) and styrene rubbers such as SBR (styrene-butadiene rubber), SBS (styrene-butadiene-styrene), SIS (sytrene-isopropylene-styrene), SEBS (styrene-ethylene-butylene-styrene), SEPS (styrene-ethylene-propylene-styrene) and the like, as well as hydrogenated ones.
- In a first embodiment, a
sidemole 1 for automobiles in which the thickness T of the molded article is 0.3 cm, a distance L from agate position 11 to theremotest position 12 on the molded article is 100 cm, and width W is 5 cm, as shown FIG. 1, was molded using an injection-molding method. - As the synthetic resin, two kinds of PP's (polypropylene), were used: one containing no ethylene (C2 in Table) and the other containing ethylene (C2 is 5 wt %) were used. Polypropylene resin containing C2 is ethylene-propylene block resin. Table 1 shows a thermoplastic resin composition of a single resin composition.
- In addition, as the glitter material, aluminium powders (A, B and C in Table) or mica pearlescent pigment, i.e., “Pearl Mica” (D in Table), was used. The aluminium powders A, B and C have average particle size of 10, 30 or 40 μm, respectively. Pearl Mica D has average particle size of 30 μm.
- Next, Table 1 shows the average particle size of total glitter materials.
- With regards to the average particle size of the glitter material, when the glitter material was one kind, the size was its average particle size. When two or more kinds were used, it was calculated according to (average particle size of each glitter material) X (content of each glitter material)/(content of total glitter materials).
- The content of the glitter material is an added amount (content) relative to 100 parts by weight of the synthetic resin amount.
- Table 2 shows an embodiment where a thermoplastic resin composition is a conjugated resin composition, mixing EPM (ethylene-propylene rubber) as a modifier and talc as a bulking agent into polypropylene resin (C2:5 wt. %). The content of the glitter material is shown parts by weight relative to the conjugated resin composition. Others are the same as those in Table 1.
- Although cyanine green and magnesium stearate are added as a colorant and dispersing agent, respectively, to the thermoplastic resin composition at an appropriate amount, they are not added depending upon the object to be used.
- Tables 1 and 2 show the flow mark, glitter deviation and glitter feeling regarding the appearance of the above respective resin molded articles.
- With regards to the flow mark and glitter deviation, absence is indicated by (ο), presence is indicated by (X) and slight presence is indicated by (Δ). With regards to the glitter feeling, presence is indicated by (ο) and absence is indicated by (X ). Evaluation on the appearance of the resin molded articles was performed by visual observation.
- The same Tables also show Comparative Examples.
- Table 1 shows that in a case of the single resin composition, the glitter material having average particle size of 10 μm (Comparative Example 2) caused a bad glitter deviation and glitter feeling, and the glitter material having average particle size of 30 μm (Comparative Examples 1 and 3) produced a slight flow mark and also a slight glitter deviation at additional of 4 parts by weight.
- Next, from Table 2, in a case of the conjugated resin composition, it is seen that slight flow mark is developed and a glitter deviation is also developed even when average particle size of the glitter material is 30 μm if the content thereof is 5 parts by weight (Comparative Example 4).
- Tables 1 and 2 show that in a case of average particle size d of the glitter material of greater than 10 μm to not greater than 200 μm, resin molded articles having much excellent appearance can be obtained by inclusion of the glitter material of not greater than 3 parts by weight in the single resin composition and the glitter material of not greater than 4 parts by weight in the conjugated resin composition.
TABLE 1 E1 E2 C1 E3 C2 E4 E5 C3 E6 E7 Resin PP (C2 = 0 wt %) 100 100 100 100 100 100 100 100 100 composition PP (C2 = 5 wt %) 100 EPM TARC Glitter material A (10 μm) 1 0.1 B (30 μm) 1 2 4 2 0.5 0.4 C (40 μm) 1 D (30 μm) 2 4 0.5 0.5 Averaged 30 30 30 30 10 40 30 30 30 28 particle size of glitter material Appearance Flowmark ∘ ∘ Δ ∘ ∘ ∘ ∘ Δ ∘ ∘ Glitter ∘ ∘ Δ ∘ X ∘ ∘ X ∘ ∘ deviation Glitter ∘ ∘ ∘ ∘ X ∘ ∘ ∘ ∘ ∘ feeling -
TABLE 2 E8 E9 C4 Resin composition PP (C2 = 0 wt %) PP (C2 = 5 wt %) 70 70 70 EPM 20 20 20 TARC 10 10 10 Glitter material A (10 μm) B (30 μm) 2 3.5 5 C (40 μm) D (30 μm) Averaged 30 30 30 particle size of glitter material Appearance Flow mark ◯ ◯ Δ Glitter ◯ ◯ X deviation Glitter ◯ ◯ ◯ feeling
Claims (9)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP8-280065 | 1996-09-30 | ||
JP280065/1996 | 1996-09-30 | ||
JP8280065A JPH10100187A (en) | 1996-09-30 | 1996-09-30 | Resin molding |
Publications (2)
Publication Number | Publication Date |
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US20010014389A1 true US20010014389A1 (en) | 2001-08-16 |
US6280837B1 US6280837B1 (en) | 2001-08-28 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US08/940,983 Expired - Lifetime US6280837B1 (en) | 1996-09-30 | 1997-09-30 | Resin molded article |
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JP (1) | JPH10100187A (en) |
Cited By (5)
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EP1607206A1 (en) * | 2003-01-21 | 2005-12-21 | Techno Polymer Co., Ltd. | Injection molding die, injection molding method, and weldless molded product |
US20070232739A1 (en) * | 2006-03-30 | 2007-10-04 | General Electric Company | Thermoplastic polycarbonate compositions with improved mechanical properties, articles made therefrom and method of manufacture |
US20070232744A1 (en) * | 2006-03-30 | 2007-10-04 | General Electric Company | Thermoplastic polycarbonate compositions with improved mechanical properties, articles made therefrom and method of manufacture |
US10369733B2 (en) | 2014-11-25 | 2019-08-06 | Kasai Kogyo Co., Ltd. | Synthetic resin molding and molding method therefor |
CN112679847A (en) * | 2020-12-22 | 2021-04-20 | 青岛正大环保科技有限公司 | High-toughness heat-resistant polypropylene packaging bag and preparation method thereof |
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US6770689B1 (en) * | 1999-03-19 | 2004-08-03 | Sakura Color Products Corp. | Aqueous glittering ink |
JP2000313758A (en) * | 1999-04-30 | 2000-11-14 | Japan Polychem Corp | Glittering material-containing polypropylenebased resin molded product |
KR100635798B1 (en) | 1999-07-23 | 2006-10-19 | 가부시키가이샤 사쿠라 크레파스 | Resin moulded articles, and applicators and ballpens using the same |
DE19962570A1 (en) * | 1999-12-23 | 2001-07-05 | Basf Ag | Production of thermoplastic molding compounds using magnesium oxide |
JP5000070B2 (en) * | 2001-03-15 | 2012-08-15 | 三井化学株式会社 | Auto parts made of polypropylene resin composition |
JP4480984B2 (en) * | 2002-11-12 | 2010-06-16 | 旭化成ケミカルズ株式会社 | Chair parts made of metallic polyamide resin |
KR100690898B1 (en) * | 2005-12-29 | 2007-03-09 | 엘지전자 주식회사 | Plastic injection molded product showing feel of metal material |
JP4966895B2 (en) * | 2007-07-09 | 2012-07-04 | 日本ポリプロ株式会社 | Propylene polymer composition |
KR101101789B1 (en) | 2009-07-20 | 2012-01-05 | 강명호 | Synthetic resin composintion for plastic article having metalic surface, injection molding method and plastic article using the same |
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US9732211B2 (en) | 2013-10-30 | 2017-08-15 | Lotte Advanced Materials Co., Ltd. | Thermoplastic resin composition having improved weather resistance |
KR102262931B1 (en) * | 2017-12-15 | 2021-06-10 | 주식회사 삼양사 | Thermoplastic resin composition comprising spherical metal particles and molded article comprising the same |
JP7048312B2 (en) * | 2017-12-28 | 2022-04-05 | 旭化成株式会社 | Resin composition |
JP7048311B2 (en) * | 2017-12-28 | 2022-04-05 | 旭化成株式会社 | Resin composition |
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JPS5149264A (en) | 1974-10-26 | 1976-04-28 | Toray Industries | KYOKANETSUKASOSEIJUSHICHAKUSHOKUSEIKEIHINNO SEIZOHOHO |
US4544600A (en) * | 1982-08-16 | 1985-10-01 | Silberline Manufacturing Company, Inc. | Resin compositions containing metals such as aluminum |
JPH0613626B2 (en) | 1984-01-18 | 1994-02-23 | 三井石油化学工業株式会社 | Polypropylene composition |
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JPH0684465B2 (en) | 1988-05-31 | 1994-10-26 | ポリプラスチックス株式会社 | Method for producing improved colored polybutylene terephthalate resin composition |
JPH01308441A (en) | 1988-06-06 | 1989-12-13 | Toray Ind Inc | Colored molding resin composition |
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ATE146509T1 (en) * | 1992-07-23 | 1997-01-15 | Silberline Ltd | METAL POWDER PIGMENT |
US5496630A (en) * | 1993-09-13 | 1996-03-05 | The Geon Company | Thermoplastic multilayer louver with a polished metal look |
DE19540437B4 (en) * | 1994-10-31 | 2004-04-01 | Toyoda Gosei Co., Ltd. | High-gloss molded part made of resin |
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-
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- 1996-09-30 JP JP8280065A patent/JPH10100187A/en active Pending
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1997
- 1997-09-30 US US08/940,983 patent/US6280837B1/en not_active Expired - Lifetime
Cited By (6)
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EP1607206A1 (en) * | 2003-01-21 | 2005-12-21 | Techno Polymer Co., Ltd. | Injection molding die, injection molding method, and weldless molded product |
EP1607206A4 (en) * | 2003-01-21 | 2006-11-29 | Techno Polymer Co Ltd | Injection molding die, injection molding method, and weldless molded product |
US20070232739A1 (en) * | 2006-03-30 | 2007-10-04 | General Electric Company | Thermoplastic polycarbonate compositions with improved mechanical properties, articles made therefrom and method of manufacture |
US20070232744A1 (en) * | 2006-03-30 | 2007-10-04 | General Electric Company | Thermoplastic polycarbonate compositions with improved mechanical properties, articles made therefrom and method of manufacture |
US10369733B2 (en) | 2014-11-25 | 2019-08-06 | Kasai Kogyo Co., Ltd. | Synthetic resin molding and molding method therefor |
CN112679847A (en) * | 2020-12-22 | 2021-04-20 | 青岛正大环保科技有限公司 | High-toughness heat-resistant polypropylene packaging bag and preparation method thereof |
Also Published As
Publication number | Publication date |
---|---|
US6280837B1 (en) | 2001-08-28 |
JPH10100187A (en) | 1998-04-21 |
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