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    • 61. 发明专利
    • BLEND OF STYRENIC BLOCK COPOLYMER AND PROPYLENE-α OLEFIN COPOLYMER
    • 苯乙烯共聚物和丙烯-α烯烃共聚物的共混物
    • JP2012184436A
    • 2012-09-27
    • JP2012120356
    • 2012-05-28
    • Dow Global Technologies Llcダウ グローバル テクノロジーズ エルエルシー
    • CHANG ANDY C
    • C08L23/14C08F4/76C08F210/06C08L53/00
    • C08L23/142C08F210/06C08L23/14C08L23/16C08L53/00C08L53/02C08L53/025C08L2314/02C08L2666/04C08L2666/24C08L2666/06C08L2666/02C08F210/16C08F2500/15C08F2500/20C08F2500/11
    • PROBLEM TO BE SOLVED: To provide a thermoplastic elastomer composition which is excellent in elasticity and flexibility, while at the same time being readily processible using typical polyolefin processing equipment.SOLUTION: The present invention relates to the thermoplastic elastomer composition comprising: a propylene-α olefin copolymer (a) having at least 70 wt.% of units derived from propylene, and 10-25 wt.% of units derived from ethylene or a C4-C10 α olefin, the propylene-α olefin copolymer exhibiting a heat of fusion of less than 37 Joules/gram and a melt flow rate of from 0.1 to 100 gram/10 minutes; and a styrenic block copolymer (b), wherein the weight ratio of the propylene-α olefin copolymer (a) to the styrenic block copolymer (b) is from 3:7 to 7:3. The composition exhibits: a 2% secant tensile modulus of less than 20 MPa; elongation at break of at least 900%; tensile strength of at least 5 MPa; and a relative immediate residual strain of less than 2X, wherein X is the residual strain exhibited by component (b) alone after the initial application of the 400% strain.
    • 待解决的问题:提供弹性和柔性优异的热塑性弹性体组合物,同时使用典型的聚烯烃加工设备容易加工。 解决方案:本发明涉及热塑性弹性体组合物,其包含:丙烯-α烯烃共聚物(a),其具有至少70重量%的衍生自丙烯的单元和10-25重量%的衍生自乙烯的单元 或C 4 -C 10α-烯烃,丙烯-α烯烃共聚物的熔融热量小于37焦耳/克,熔体流动速率为0.1至100克/ 10分钟; 和苯乙烯类嵌段共聚物(b),其中丙烯-α烯烃共聚物(a)与苯乙烯类嵌段共聚物(b)的重量比为3:7〜7:3。 该组合物显示:小于20MPa的2%正割拉伸模量; 断裂伸长率至少为900%; 拉伸强度至少5 MPa; 和小于2X的相对立即残留应变,其中X是初始施用400%菌株后单独组分(b)显示的残余应变。 版权所有(C)2012,JPO&INPIT