4-METHYL-1-PENTENE COPOLYMER COMPOSITION, MOLDED BODY, MANDREL, AND METHOD FOR PRODUCING RUBBER HOSE
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United States of America Patent
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Issued Date -
Mar 27, 2025
app pub date -
Oct 26, 2022
filing date -
Oct 26, 2022
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Abstract
A 4-methyl-1-pentene copolymer composition (X), including 50 to 90 parts by mass of a 4-methyl-1-pentene-based polymer (A) having a melting point in a range of 200 to 250° C. as measured by DSC, 5 to 30 parts by mass of a 4-methyl-1-pentene-based polymer (B) having a melting point of lower than 200° C. or having no melting point observed as measured by DSC, and 5 to 30 parts by mass of a thermoplastic elastomer (C) other than the (A) and the (B), and satisfying the following requirements (a) and (b), a molded body composed of the composition (X), and a method for producing a rubber hose. Requirement (a): the tan δ peak temperature determined by dynamic viscoelasticity measurement in a temperature range of 0 to 240° C. at a frequency of 10 rad/s is 0 to 60° C.; and requirement (b): the tan δ peak value determined by dynamic viscoelasticity measurement in a temperature range of 0 to 100° C. at a frequency of 10 rad/s is 0.15 to 0.8.
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