RELEASE AGENT FOR TIRE BLADDER, TIRE BLADDER, AND MOLDING OF PNEUMATIC TIRE

A mold release agent for being coated onto a tire bladder made of a zinc-oxide-incorporated butyl rubber during pneumatic-tire molding, the mold release agent being characterized in containing (A) organopolysiloxane, which contains a carboxy group indicated by the general formula (1) below (in the f...

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Hauptverfasser: INOKUCHI, Yoshinori, HONSHO, Nobuaki, MINATO, Takakazu
Format: Patent
Sprache:eng ; fre ; ger
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Beschreibung
Zusammenfassung:A mold release agent for being coated onto a tire bladder made of a zinc-oxide-incorporated butyl rubber during pneumatic-tire molding, the mold release agent being characterized in containing (A) organopolysiloxane, which contains a carboxy group indicated by the general formula (1) below (in the formula, R 1 is a substituted or unsubstituted C1-C30 monovalent hydrocarbon group excluding R 2 , R 2 is a carboxy-group-substituted C1-C30 monovalent organic group, R 3 is R 1 or R 2 , and n is an integer of 3 to 2000.). This mold release agent produces a longer service life of a tire bladder and leads to reduced tire production cost because the amount of silicone that migrates to the tire side is low when the tire is released, and repeated mold-release performance is enhanced.