Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Reexamination Certificate
2001-12-19
2004-05-11
Woodward, Ana (Department: 1711)
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
C428S035700, C428S036900, C524S104000, C524S127000, C524S168000, C525S066000, C525S179000
Reexamination Certificate
active
06733854
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention concerns a polyamide resin composition having excellent gasoline resistance and impact resistance under cold environment, which is applicable to a fuel tube system for a motor vehicle.
2. Description of the Prior Art
In general, polyamide resins are a general term applied to polymers consisting of amide (—CONH—) groups joined by linear aliphatic sections. Representative of the resins are nylon-6,6 obtained by condensation of adipic acid and hexamethylenediamine, and nylon 6, which is a polymerization product of &egr;-caprolactam. An original polyamide introduced to the market as a synthetic fiber is known as 6,6polyamide under the trademark name nylon. However, in these days, the general term ‘nylon’, instead of polyamide, is widely used.
Polyamides are very excellent in mechanical strength, abrasion resistance, heat resistance, chemical resistance, electrical insulation and arc resistance, and are thus variously employed to internal or external decorative materials of motors, electrical or electronic components, sporting goods and industrial materials. Since the polyamides suffer from the drawbacks of low compatibility, flexibility, viscosity and workability with rubber, despite numerous applications in internal or external decorative materials for motor vehicles, they have limitations for use in internal tubes of motors or hoses.
Thus, with a view to overcome the drawbacks of conventional polyamide resins, there is provided a polyamide resin reinforced with a nylon elastomer having excellent moldability and flexibility. In this regard, U.S. Pat. Nos. 4,230,838, 4,331,786, 4,332,920 and 4,207,410 disclose a polyamide elastomer of polyoxytetramethylene glycol, included in polyether structure, by substituting an elastomer for a chain-limitator having 4 to 19 carbon atoms between amide groups in polyamide.
In addition, U.S. Pat. No. 5,919,865 refers to a high-impact polyamide composition prepared by adding ethylene propylene rubber (EPR), ethylene propylene diene monomer (EPDM) rubber and maleic anhydride modified SEBS-g-MA to the polyamide. U.S. Pat. No. 5,559,185 discloses a thermoplastic resin composition and U.S. Pat. No. 5,688,866 refers to an impact modification of thermoplastics.
However, the polyamide elastomer of polyoxytetramethylene glycol has an average molecular weight of at most 600 to 800. In addition, the elastomers prepared by the above conventional methods do not have excellent flexibility and toughness.
The above compositions are improved in flexibility and impact resistance, but are disadvantageous in that, when they are actually employed as tube materials of a motor fuel system, external appearance and workability become poor and thickness of final articles is irregular. Also, disperability of rubber is lowered and uniform polyamide resin composition is difficult to obtain during extrusion.
With a view to resolve the above problems, a relatively inexpensive rubber and plasticizer capable of providing high gasoline resistance, impact resistance under cold environment, elongation under tension, good external appearance of molded articles and excellent flexibility, and a thickener useful for improvement of workability, are used to yield materials having more excellent flexibility, elongation and impact strength, external appearance and gasoline resistance, compared to conventional nylon elastomer reinforced polyamide resins.
SUMMARY OF THE INVENTION
Aiming to solve the above problems, we, the inventors of the present invention, have developed a novel polyamide resin composition. It is found that, when a rubber having good dispersability, a nylon thickener for obtaining uniformly thick components and uniform workability, a plasticizer of nylon responsible for providing flexibility suitable for motor fuel tube systems, and a core-shell rubber for increasing external appearance, elongation and impact strength, are used, there is yielded a polyamide resin composition which has flexibility, workability, impact resistance under cold environment and external appearance equal to or better than those of conventional nylon elastomer reinforced polyamide resin composition.
Thus, it is an object of the present invention to provide a polyamide resin composition.
It is another object of the present invention to provide a synthetic resin product prepared from the polyamide resin composition.
DETAILED DESCRIPTION OF THE INVENTION
To achieve the objects, the present invention provides a polyamide resin composition comprising (a) 30-95 parts by weight of polyamide resin, (b) 1-45 parts by weight of an impact resistant component selected from the group consisting of ethylene propylene copolymer rubber (EPM), ethylene propylene rubber (EPR), ethylene propylene diene monomer rubber (EPDM), maleic anhydride modified ethylene propylene rubber (EPR-g-MA), maleic anhydride modified ethylene propylene copolymer rubber (EPM-g-MA), maleic anhydride modified ethylene propylenediene monomer rubber (EPDM-g-MA), arylmethacrylate-butadiene-styrene (MBS), styrene-butadiene-styrene triblock copolymer, all-acrylic core-shell rubber, ethylene ethylacrylate (EEA), styrene butadiene rubber (SBR), ethylene vinylalcohol (EVOH), various thermoplastic elastomers and plastomers, or mixtures thereof, (c) 0.1-20 parts by weight of nylon plasticizer, (d) 0.01-5 parts by weight of nylon thickener having at least two functional groups at the ends of its polymer, and (e) 0.5-10 parts by weight of core-shell rubber.
Further, the present invention provides a polyamide resin composition characterized in that the polyamide is selected from the group consisting of nylon 6, nylon 7, nylon 8, nylon 10, nylon 2, nylon 66, nylon 69, nylon 610, nylon 611, nylon 612, nylon 6T, nylon 6/66, nylon 6/12, nylon 6/6T, or combinations thereof.
Further, the present invention provides a polyamide resin composition characterized in that the polyamide is a homopolymer; a copolymer blended or copolymerized with at least one selected from the group consisting of polyimide, polysulfone, polyethersulfone, polyphenylene sulfide, polyphenylene ether or polyphenylene oxide, high-impact polystyrene, acrylonitrile-butadiene-styrene copolymer, acrylonitrile-ethylenepropylene-styrene, acrylonitrile-styrene-alkylacrylate, polycarbonate, polyethylene terephthalate and polybutyleneterephthalate; or a mixture of the homopolymer and the copolymer.
Further, the present invention provides a polyamide resin composition characterized in that the polyamide comprises semi-crystalline, amorphous structures, or mixtures thereof.
Further, the present invention provides a polyamide resin composition characterized in that the nylon plasticizer is selected from the group consisting of lactams, sulfonamides, phthalates, adipates, phosphates, glycolates, or mixtures thereof.
Further, the present invention provides a polyamide resin composition characterized in that the nylon thickener is selected from the group consisting of maleic anhydride modified polyolefin, maleic anhydride modified styrene resin and polyfunctional epoxy resin.
Further, the present invention provides a polyamide resin composition characterized in that the core-shell rubber comprises a hard polymer having a glass transition temperature of 25° C. or higher and a soft polymer having a glass transition temperature of 0° C. or higher.
Further, the present invention provides a polyamide resin composition characterized in that the hard polymer and the soft polymer in the core-shell rubber have a weight ratio of 1:9 to 9:1.
Further, the present invention provides a polyamide resin composition characterized in that the core-shell rubber contains 0.1-25 parts by weight of a reaction monomer on the basis of the whole weights of the core-shell rubber, the reaction monomer being selected from maleic acid, maleic anhydride, monoester or diester of maleic acid, tert-butylacrylate, acrylic acid, glycidylacrylate and vinyloxazoline, or mixtures thereof.
Further, the present invention provides a polyamide resin composition characte
Choi Jin-Myung
Lee Sang-Rok
Antonelli Terry Stout & Kraus LLP
Hyundai Motor Company
Woodward Ana
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