Method For Predicting The Break-up Possibility Of A Synthetic Resin Filament In A Melt Blowing Process From Rheological Properties Of The Synthetic Resin

Patent metadata

Field	Value
Publication number	US-2019113428-A1
Application number	US-201716090732-A
Country	US
Kind code	A1
Filing date	Aug 31, 2017
Priority date	Oct 17, 2016
Publication date	Apr 18, 2019
Grant date	—

Abstract

The present invention relates to a method for predicting the break-up possibility of a synthetic resin filament in a melt blowing process from the rheological properties of the synthetic resin. According to the present invention, a method that is capable of predicting the break-up possibility of the synthetic resin filament in the melt blowing process for preparing a filament using the synthetic resin in advance, through the measurement of the rheological properties of the synthetic resin, is provided.

First claim

1 . A method for predicting the break-up possibility of a synthetic resin filament in a melt blowing process, comprising the steps of:
applying 200% strain to a synthetic resin sample at 235° C., and then measuring a change in residual stress with passage of time; and confirming whether or not the change in residual stress fulfills the following Mathematical Formula 1.
(RS 1 /RS 0 )*100≤0.04  [Mathematical Formula 1]

In Mathematical Formula 1, RS 0 is residual stress at one time point (t 0 ) of less than 0.05 seconds after applying 200% strain to the synthetic resin sample at 235° C., and RS 1 is residual stress at one time point (t 1 ) between 0.05 seconds and 1.50 seconds after applying 200% strain to the synthetic resin sample at 235° C.

2 . The method for predicting the break-up possibility of a synthetic resin filament according to claim 1 , wherein in Mathematical Formula 1, t 0 is 0.02 seconds and t 1 is 1.00 seconds.

3 . The method for predicting the break-up possibility of a synthetic resin filament according to claim 1 , wherein the synthetic resin fulfilling Mathematical Formula 1 has properties fulfilling the following Mathematical Formula 2.
( M w *10 −5 )*(MWD 0.5 )≤3.0  [Mathematical Formula 2]
In Mathematical Formula 2, Mw is the weight average molecular weight of the synthetic resin (g/mol), MWD is the molecular weight distribution of the synthetic resin.

4 . The method for predicting the break-up possibility of a synthetic resin filament according to claim 1 , wherein the synthetic resin fulfilling Mathematical Formula 1 has properties fulfilling the following Mathematical Formula 3.
HMW≤2.5  [Mathematical Formula 3]
In Mathematical Formula 3, HMW is a content (wt %) of the polymer having a molecular weight (M, g/mol) of log(M)≥5.9.

5 . The method for predicting the break-up possibility of a synthetic resin filament according to claim 1 , wherein the synthetic resin is polypropylene.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Hyun Sup
• Lee Ki Soo
• Jeon Sang Jin
• An Sang Eun
• Lee Myung Han
• Park Hee Kwang
• Kim Sang Eun
• Lee Sang Hoon

Classifications

• D10B2321/022

  polypropylene · CPC title

• G01N11/00 Primary

  Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties · CPC title

• D01D5/0985

  by means of a flowing gas (e.g. melt-blowing) · CPC title

• G01N2011/0033

  Yield stress; Residual stress at zero shear rate · CPC title

• G01N2011/004

  Stress relaxation time · CPC title