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US 4,359,539 AGranted
Foaming synthetic resin compositions stabilized with certain higher ethers, esters or anhydrides
AssigneeAsahi-Dow Limited
InventorsTsuneo Hoki, Yutaka Matsuki
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Abstract
Substantially closed-cell aliphatic olefin polymer foams having improved dimensional stability are provided by the inclusion therein of from 0.1 to 10 weight percent, based upon the olefin polymer, of certain higher aliphatic hydrocarbyl ether, ester or anhydride compounds.
Claims3
An extrusion foaming process for expanding an aliphatic olefin polymer which comprises
- (1) heating plastifying said olefin polymer;
- (2) admixing said heat plastified olefin polymer under conditions of elevated temperature and pressure with a volatile organic blowing agent and with from 0.1 to 10 weight percent based upon said olefin polymer of a compound of the formula I:
- R.sub.1 --X--R.sub.2 (I)
- wherein R.sub.1 and R.sub.2 represent an aliphatic hydrocarbon group having 3 to 24 carbon atoms, respectively, with at least one thereof having 10 or more carbon atoms, and X represents a radical selected from the group consisting of ##STR2## (3) extruding the resultant heat plastified mixture into a zone of lower pressure to thereby produce an aliphatic olefin polymer foam product.
1 more element
Dependencies are inferred from the claim text.