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US 2021/0261835 A1Published application
Hot-melt composition and sealing material
AssigneeAsahi Chemical Synthetic Co., Ltd.
InventorsDaisuke KUMON, Akito NAKAGAWA
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AssigneeAsahi Chemical Synthetic Co., Ltd.
InventorsDaisuke KUMON, Akito NAKAGAWA
Estimating the term…
This hot-melt composition contains, per 100 parts by mass of a hydrogenated styrene thermoplastic elastomer having a styrene-based polymer block at both ends thereof and a hydrogenated diene polymer block at a middle portion thereof, and having a mass-average molecular weight of 250,000 to 600,000, 150 to 450 parts by mass of an aromatic tackifying resin having a softening point of 135 to 160° C. and a mass-average molecular weight of 500 to 2,500, 100 to 500 parts by mass of a tackifying resin for a hydrogenated diene polymer block which has a softening point of 100 to 160° C., 500 to 1,500 parts by mass of a non-aromatic hydrocarbon oil having a kinematic viscosity at 40° C. of 90 mm2/s or higher, wherein 30% by mass or more of the non-aromatic hydrocarbon oil is a non-aromatic hydrocarbon oil having a kinematic viscosity at 40° C. of 300 to 500 mm2/s.
A hot-melt composition comprising, with respect to 100 parts by mass of a hydrogenated styrene thermoplastic elastomer having styrene-based polymer blocks at both ends and a hydrogenated diene polymer block at a middle portion and having an a mass-average molecular weight of 250,000 to 600,000 (A), 150 to 450 parts by mass of an aromatic tackifying resin having a softening point of 135 to 160° C. and a mass-average molecular weight of 500 to 2,500 (B), 100 to 500 parts by mass of a tackifying resin for a hydrogenated diene polymer block which has a softening point of 100 to 160° C. (C), 500 to 1,500 parts by mass of a non-aromatic hydrocarbon oil having a kinematic viscosity at 40° C. of 90 mm2/s or higher (D), wherein 30% by mass or more of the non-aromatic hydrocarbon oil (D) is a non-aromatic hydrocarbon oil having a kinematic viscosity at 40° C. of 300 to 500 mm2/s (D-1).
Dependencies are inferred from the claim text.