公开(公告)号：US20200023567A1

公开(公告)日：2020-01-23

申请号：US16336221

申请日：2017-09-27

Applicant: DSM IP ASSETS B.V.

Inventor： Cornelis Wilhelmus Maria BASTIAANSEN ,  John Richard SEVERN ,  Lihua SHEN

IPC: B29C55/00

Abstract: The invention relates to a process for the production of a high strength transparent high density polyethylene article comprising the steps of (i) heating a high density polyethylene (HDPE) to a temperature above the melting temperature (Tm) of the HDPE; (ii) molding the heated HDPE obtained in step (i) to form a hot molded HDPE article; (iii) cooling the hot molded HDPE article to a temperature below Tm to form a melt-crystallized HDPE article; (iv) stretching the melt-crystallized HDPE article to a total draw ratio of at least 5 comprising at least one stretching step of the article at a temperature T1 below the melting temperature Tm to a draw ratio (DR1) of at least 2 to form an oriented HDPE article, wherein the HDPE has a melt flow index (MFI) measured at 21.6 kg and 190° C. according to ASTM D1238 of at most 1.5 g/I Omin, an isotropic density measured according to ISO 1 183-1 A of at most 0.955 g/cm3 and a Tm measured according to ISO 1 1357-3 of greater than 130° C. The invention also relates to high strength transparent HDPE articles and products comprising the high strength transparent HDPE article such as ballistic resistant articles, visors, car parts, train parts, plane parts, windshields, windows and radomes.

公开(公告)号：US20180361650A1

公开(公告)日：2018-12-20

申请号：US16061820

申请日：2016-12-16

Applicant: DSM IP Assets B.V.

Inventor： Lihua SHEN ,  John Richard SEVERN ,  Cornelis Wilhelmus Maria BASTIAANSEN

IPC: B29C55/02 ,  B29C55/04 ,  B29C55/00 ,  D01F1/10 ,  D01F6/04 ,  D01F6/60

Abstract: The invention relates to a stretched molded article comprising a polymer A and a compound B, wherein the polymer A is a polyamide or a polyolefin and is at least partially oriented and comprises a crystalline phase and a non-crystalline phase, wherein the mass of compound B is from 0.25 to 10 mass % relative to the mass of polymer A, and wherein the compound B has a refractive index (nB) higher than the isotropic refractive index of polymer A (nA). The invention further relates to a process for manufacturing such stretch molded article, the use of such stretch molded articles and a product comprising such stretch molded article.