公开(公告)号：US20020150781A1

公开(公告)日：2002-10-17

申请号：US10024426

申请日：2001-12-18

Applicant: The Dow Chemical Company

Inventor： Jeffrey A. Wanic ,  Shaun E. Pirtle

IPC: B32B027/32 ,  C08F008/00

CPC classification number: B32B7/06 ,  B32B27/08 ,  B32B27/32 ,  B32B2307/31 ,  B32B2307/7242 ,  B32B2323/043 ,  B32B2439/70 ,  B32B2439/80 ,  C08L23/04 ,  C08L23/0815 ,  C08L23/10 ,  C08L2314/06 ,  C09K3/10 ,  C09K2200/0617 ,  C09K2200/062 ,  Y10T428/31855 ,  Y10T428/31909 ,  C08L2666/04

Abstract: A peelable seal comprises a mixture of at least two immiscible polymers. The first polymer forms a continuous phase in the peelable seal, whereas the second polymer is dispersed in the continuous phase. For example, a peelable seal can also be made from a mixture of an ethylene polymer with a melt index in the range from about 0.1 to about 20 g/10 minutes and a propylene polymer with a melt flow rate in the range from about 0.01 to about 2 g/10 minutes. The two polymers define a shear viscosity differential: nullnullnull(null1nullnull2)/null1null, wherein null1 and null2 are the respective shear viscosity for the first and second polymers at a temperature of 230null C. and a shear rate of about 100 radian/second. Preferably, the shear viscosity differential is less than about 100%.

Abstract translation: 可剥离密封件包括至少两种不混溶聚合物的混合物。 第一聚合物在可剥离密封件中形成连续相，而第二聚合物在连续相中分散。 例如，可剥离的密封件也可以由熔体指数在约0.1至约20g / 10分钟范围内的乙烯聚合物的混合物制成，而丙烯聚合物的熔体流动速率范围为约0.01至 约2g / 10分钟。 两种聚合物限定了剪切粘度差：DELTA = |（eta1-eta2）/ eta1 |，其中eta1和eta2是第一和第二聚合物在230℃的温度下的剪切粘度和约为 100弧度/秒。 优选地，剪切粘度差小于约100％。