PURGING AGENT FOR EXTRUSION MOLDING MACHINE, AND PURGING METHOD

• Main Authors: NAKANO SHIGENORI, FUKUYAMA KANA, NISHIGORI MASAHIRO, SAKUMA MASAMI
• Format: Patent
• Language: English; Japanese
• Published: 03.08.2015
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PROBLEM TO BE SOLVED: To provide a purging agent for extrusion molding machines, which exhibits an excellent purging effect (cleaning effect) when a resin left behind in the extrusion molding machine is purged (cleaned).SOLUTION: The purge agent for extrusion molding machines contains polyethylene (A), the melt flow rate (190°C, 2,160 g load, JIS K7210(1999)) of which is 0.5-3.0 g/10 minutes, and alkali metal bicarbonate. The total content of the polyethylene (A) and the alkali metal bicarbonate accounts for 90 mass% or more of the total mass of the purging agent for extrusion molding machines. 【課題】押出成形機内に残留した樹脂のパージ効果（洗浄効果）に優れた押出成形機用パージ剤を提供する。【解決手段】メルトフローレート（１９０℃、２１６０ｇ荷重、ＪＩＳ Ｋ７２１０（１９９９））が０．５ｇ／１０分〜３．０ｇ／１０分であるポリエチレン（Ａ）と、炭酸水素アルカリ金属塩と、を含有し、前記ポリエチレン（Ａ）及び前記炭酸水素アルカリ金属塩の総含有量が、押出成形機用パージ剤の全量に対し、９０質量％以上である押出成形機用パージ剤である。【選択図】なし