초록 ▼

A thermoplastic synthetic resin such as polyethylene or ethylene-vinyl acetate copolymer resin containing 0.1 to 10 wt. % of a specific additive selected from specific classes of compounds, namely saturated higher fatty acid amides, saturated higher aliphatic amines and complete esters of saturated

A thermoplastic synthetic resin such as polyethylene or ethylene-vinyl acetate copolymer resin containing 0.1 to 10 wt. % of a specific additive selected from specific classes of compounds, namely saturated higher fatty acid amides, saturated higher aliphatic amines and complete esters of saturated higher fatty acids is found to be very suitable for production of expanded articles and can be easily formed into expanded articles with little shrinkage after expansion, free from creases on the surface or cracks on the cell walls, and having excellent characteristics such as good closed cellular characteristic, higher compressive strength, low density, etc.

대표청구항 ▼

An expanded article of an olefin polymer comprising an expanded product of an olefin polymer containing at least one compound, which imports little shrinkage to said expanded article after expansion selected from the group consisting of the compounds represented by the formulas (I), (II) and (III) a

An expanded article of an olefin polymer comprising an expanded product of an olefin polymer containing at least one compound, which imports little shrinkage to said expanded article after expansion selected from the group consisting of the compounds represented by the formulas (I), (II) and (III) as set forth below in an amount of 0.1 to 10% by weight based on the weight of said resin and having a closed cellular characteristic value of 0 to 0.5 g/cm3, a bulk density of 10 to 200 kg/m3 and a compressive strength coefficient of 2.15×10-3 to 2.89×10-2: [Figure] (I) wherein R1 is an alkyl group having 10 to 24 carbon atoms, X and X′each hydrogen atom, an alkyl group having 1 to 24 carbon atoms which may be substituted or a substituent selected from the group consisting of －(CH2)nNH2 wherein n is an integer of 1 to 22, [Figure] wherein R5 is an alkyl having 1 to 24 carbon atoms, －(R4O)mH wherein R4 is an alkylene group having 1 to 5 carbon atoms and m an integer of 1 to 10, [Figure] wherein R5 is an alkyl having 1 to 24 carbon atoms, [Figure] wherein n is an integer of 1 to 22 and A is hydrogen atom or [Figure] wherein A′is hydrogen atom or [Figure] (II) wherein R2 is an alkyl group having 9 to 23 carbon atoms, Y and Y′each hydrogen atom, an alkyl having 1 to 24 carbon atoms, an acyl having 10 to 24 carbon atoms or a substituent of the formula －(R4O)mA2 wherein A2 is hydrogen atom, an alkyl having 1 to 24 carbon atoms or acyl having 10 to 24 carbon atoms; [Figure] (III) wherein means plural alkyl or hydroxyalkyl groups corresponding in number to the integer l, which may be the same or different, each having 9 to 23 carbon atoms, R4 an alkylene group having 1 to 5 carbon atoms, k an integer of 0 to 7, l an integer of 2 to 8 and Z a l-valent residue of l-valent polyhydric alcohol from which l hydroxyl groups are eliminated.