POLYETHYLENE RESIN COMPOSITION, PIPE AND JOINT

• Main Authors: MIYAKE MASAHIDE, KAKIHARA ICHIRO
• Format: Patent
• Language: English; Japanese
• Published: 02.02.2017
• Subjects: BLASTING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; JOINTS OR FITTINGS FOR PIPES; LIGHTING; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; MEANS FOR THERMAL INSULATION IN GENERAL; MECHANICAL ENGINEERING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; THEIR PREPARATION OR CHEMICAL WORKING-UP; THERMAL INSULATION IN GENERAL; WEAPONS

PROBLEM TO BE SOLVED: To provide a polyethylene resin composition classified to PE100 by ISO9080 specification, having excellent in long term property with 100 years guarantee and further excellent molding processability, a pipe containing the same and a joint.SOLUTION: There is provided a polyethylene resin composition containing an ethylene single polymer and/or a copolymer of ethylene and α-olefin having 3 to 20 carbon atoms and satisfying following (1) to (4). (1) density is 946 to 953 kg/m. (2) melt flow rate (code T) is 0.15 to 0.50 g/10 min. (3) molecular weight distribution is 15 to 40. (4) a ratio of slope of a plot line in logarithm of leap pressure to logarithm of breakage time has the following relationship in a hot inner pressure creep test at 20°C defined in ISO 9080. slope by 1000 hr/slop after 1000 hr>1.5.SELECTED DRAWING: None 【課題】ＩＳＯ９０８０規格によりＰＥ１００に分類され、かつ１００年保証である、優れた長期特性を有し、その上、優れた成形加工性を有するポリエチレン樹脂組成物、それを含むパイプ、及び継手を提供することを目的とする。【解決手段】エチレン単独重合体、及び／又はエチレンと炭素数３〜２０のα−オレフィンとの共重合体を含み、下記（１）〜（４）を満たす、ポリエチレン樹脂組成物。（１）密度が９４６〜９５３ｋｇ／ｍ3である。（２）メルトフローレート（コードＴ）が０．１５〜０．５０ｇ／１０分である。（３）分子量分布が１５〜４０である。（４）ＩＳＯ ９０８０で規定される２０℃における熱間内圧クリープ試験において、破壊時間の対数に対するフープ圧の対数のプロットラインの傾きの比が以下の関係を有する。１０００時間未満の傾き／１０００時間以降の傾き＞１．５【選択図】なし