公开(公告)号：US20040087723A1

公开(公告)日：2004-05-06

申请号：US10285261

申请日：2002-10-31

Applicant: Sonoco Development, Inc.

Inventor： Alan D. Williams ,  James Stevens ,  Jeremy Morin

IPC: C08L023/00 ,  C08L023/04

CPC classification number: B65D35/08 ,  C08L23/06 ,  C08L23/10 ,  Y10T428/13 ,  C08L2666/06

Abstract: Compositions for injection-molding of long, thin-walled, one-piece squeeze tubes include low-density polyethylene having a density less than about 0.925 g/cc and a melt index of at least about 50 g/10 minutes, and polypropylene having a high melt index greater than about 800 g/10 minutes, wherein the high melt index is attained by peroxide degradation of the polypropylene during melt processing. The compositions can also include a polymer that is miscible and compatible with low-density polyethylene and polypropylene for enhancing flow of the molding composition in the mold, the polymer having a glass transition temperature Tg of about null20 to null40null C, and/or a metallocene resin having a density less than about 0.915 g/cc.

Abstract translation: 用于注射成型长，薄壁，一体式挤压管的组合物包括密度小于约0.925g / cc和熔体指数为至少约50g / 10分钟的低密度聚乙烯，以及具有 高熔体指数大于约800g / 10分钟，其中高熔体指数通过熔融加工过程中聚丙烯的过氧化物降解而达到。 组合物还可以包括与低密度聚乙烯和聚丙烯是可混溶的并且与低密度聚乙烯和聚丙烯相容的聚合物，用于增加模具中模塑组合物的流动，聚合物的玻璃化转变温度Tg为约-20至-40℃，和/ 或密度小于约0.915g / cc的茂金属树脂。