PROPYLENE-BASED COMPOSITIONS OF ENHANCED APPEARANCE AND EXCELLENT MOLD FLOWABILITY

• Main Authors: JEFFREY S SALEK, RITA A MAJEWSKI
• Format: Patent
• Language: English; Japanese
• Published: 06.08.2020
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

To provide a class of impact copolymer polypropylene (ICP) compositions exhibiting the advantageous combination of excellent tiger (flow) marking performance in large/long molded parts, very low gel fraction and exceptional mold flowability (high MFR) despite the high viscosity ratio (e.g.,>4) between rubber and propylene-based matrix phases.SOLUTION: Furthermore, it has been surprisingly found that the inventive compositions are associated with a low gel fraction even when using a quite coarse mesh wire screen, e.g., 60 mesh wire screen, regardless of screw type (e.g., twin or single screw). Finally, the inventive compositions exhibit significantly reduced the levels of volatiles, and excellent stiffness-impact balance, thereby being used as standalone materials or in filled compounds.SELECTED DRAWING: None 【課題】ゴム相とプロピレン系マトリックス相との間の高い粘度比（例えば、＞４）にもかかわらず、大型の／長い成型部品における優れたタイガー（フロー）マーク発生パフォーマンス、非常に低いゲル分率および並外れた金型内流動性（高ＭＦＲ）を好都合に兼ね備えて示す一分類のインパクトコポリマーポリプロピレン（ＩＣＰ）組成物を提供すること。【解決手段】さらに、驚くべきことに、本発明の組成物は、かなり粗いメッシュワイヤスクリーン、例えば６０メッシュワイヤスクリーンを使用した場合であっても、スクリューの型（例えば、二軸または単軸のスクリュー）に関係なく低ゲル分率を伴うことがわかった。最後に、本発明の組成物は、顕著に低減されたレベルの揮発性物質および優れた剛性−衝撃バランスを示し、単独物質または充填化合物として使用される。【選択図】なし