公开(公告)号：US07056971B2

公开(公告)日：2006-06-06

申请号：US10074070

申请日：2002-02-12

Applicant: Rajesh Kumar Varma

Inventor： Rajesh Kumar Varma

IPC: C08L53/02

CPC classification number: C09J123/04 ,  B65D39/0017 ,  B65D41/0442 ,  B65D53/02 ,  C08L23/04 ,  C08L23/20 ,  C08L23/22 ,  C08L53/00 ,  C08L53/02 ,  C08L53/025 ,  C08L2205/02 ,  C08L2666/04 ,  C09J153/02 ,  C09J153/025 ,  Y10T428/1352 ,  C08L2666/24

Abstract: A thermoplastic elastomer (“TPE”) which is oxygen-permeable is provided with excellent barrier properties against oxygen by melt-blending with a liquid polyisobutene oil plasticizer in an amount insufficient to render the plasticized elastomer tacky. If made tacky, enough detackifier is used to allow the product to be formed into a removable seal. The TPE may be a conventional thermoplastic vulcanizate or a block copolymer of a vinylaromatic compound, typically styrene, and a conjugated diene, typically butadiene or isoprene, or mixtures thereof; the block may be a diblock, triblock or higher block, but the preferred polyblock copolymer is a triblock with styrene end-blocks and a butadiene/isoprene mid-block. Preferably the diene mid-block is hydrogenated to provide a poly(lower)monoolefin mid-block. When the TPE is a TPV, some or all of the mineral oil used to make the TPV processable may also be substituted with the polyisobutene plasticizer. The elastomeric product is particularly useful for sealing elements for containers in which foods, beverages and medical products must be preserved for a long period.

Abstract translation: 具有透氧性的热塑性弹性体（“TPE”）通过与液体聚异丁烯油增塑剂熔融共混而具有优异的氧气阻隔性，其量不足以使塑化弹性体发粘。 如果发粘，则使用足够的防粘剂来使产品形成可移除的密封。 TPE可以是常规的热塑性硫化橡胶或乙烯基芳族化合物（通常为苯乙烯）和共轭二烯（通常为丁二烯或异戊二烯）或其混合物的嵌段共聚物; 该嵌段可以是二嵌段，三嵌段或更高嵌段，但优选的多嵌段共聚物是具有苯乙烯端嵌段和丁二烯/异戊二烯嵌段的三嵌段。 优选地，二烯中间嵌段被氢化以提供聚（低级）单烯烃中间嵌段。 当TPE是TPV时，用于使TPV可加工的一些或全部矿物油也可以用聚异丁烯增塑剂代替。 弹性体产品特别适用于必须长期保存食品，饮料和医疗产品的容器的密封元件。