Invention Grant
- Patent Title: Multimodal polyethylene screw cap
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Application No.: US16332066Application Date: 2017-09-08
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Publication No.: US10913041B2Publication Date: 2021-02-09
- Inventor: Saranya Traisilanun , Watcharee Cheevasrirungruang , Warachad Klomkamol
- Applicant: Thai Polyethylene Co., Ltd. , SCG Chemicals Co., Ltd.
- Applicant Address: TH Bangkok; TH Bangkok
- Assignee: Thai Polyethylene Co., Ltd.,SCG Chemicals Co., Ltd.
- Current Assignee: Thai Polyethylene Co., Ltd.,SCG Chemicals Co., Ltd.
- Current Assignee Address: TH Bangkok; TH Bangkok
- Agency: Banner & Witcoff, Ltd.
- Priority: EP16188337 20160912
- International Application: PCT/EP2017/072593 WO 20170908
- International Announcement: WO2018/046667 WO 20180315
- Main IPC: C08F2/01
- IPC: C08F2/01 ; C08F110/02 ; C08L23/06 ; B01J8/00 ; B01J8/22 ; C08F2/18 ; B65D41/04

Abstract:
The present invention relates to a multimodal polyethylene composition comprising: (A) 35 to 65 parts by weight, preferably 45 to 65 parts by weight, most preferred 50 to 60 parts by weight, of the low molecular weight polyethylene having a weight average molecular weight (Mw) of 20,000 to 90,000 g/mol; (B) 5 to 40 parts by weight, preferably 5 to 30 parts by weight, most preferred 5 to 20 parts by weight, of the first high molecular weight polyethylene having a weight average molecular weight (Mw) of more than 150,000 to 1,000,000 g/mol or the first ultra high molecular weight polyethylene having a weight average molecular weight (Mw) of more than 1,000,000 to 5,000,000 g/mol; and (C) 20 to 60 parts by weight, preferably 25 to 60 parts by weight, most preferred 35 to 55 parts by weight, of the second high molecular weight polyethylene having a weight average molecular weight (Mw) of more than 150,000 to 1,000,000 g/mol or the second ultra high molecular weight polyethylene having a weight average molecular weight (Mw) of more than 1,000,000 to 5,000,000 g/mol, wherein the molecular weight distribution of the multimodal polyethylene composition is from 10 to 25, preferably 10 to 20, determined by Gel Permeation Chromatography; the isothermal crystallization half-time of the multimodal polyethylene composition at a temperature of 123° C. is 7 min or less, preferably 6 min or less, preferably 2-6 min, according to Differential Scanning Calorimetry; and a spiral flow length at a temperature of 220° C. is at least 200 mm, preferably 250-400 mm and a screw cap comprising the same.
Public/Granted literature
- US20200079938A1 MULTIMODAL POLYETHYLENE SCREW CAP Public/Granted day:2020-03-12
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