US2026022497A1PendingUtilityA1
Ultra high molecular weight polyethylene multifilament yarn
Est. expiryDec 14, 2031(~5.4 yrs left)· nominal 20-yr term from priority
D01D 5/06D07B 2201/2009D07B 2201/1096D07B 1/025D07B 2501/2061D07B 2501/2038D07B 2205/2014D10B 2321/0211D02G 3/02Y10T442/60Y10T428/31913Y10T428/249921Y10T428/24124Y10T428/1369Y10T428/298D01F 6/04
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Claims
Abstract
Process and products for producing a solution-spun multifilament yarn containing n filaments are provided, wherein an ultra-high molecular weight polyethylene (UHMWPE) solution containing UHMWPE polymer and a solvent for the UHMWPE polymer are spun through n spin-holes of a spin plate and drawn before, during or after removal of the solvent to thereby obtain the multifilament yarn containing n filaments, the yarn having a tenacity (Ten) as expressed in cN/dtex of Ten(cN/dtex)=f×n −0.05 ×dpf −0.15 , wherein Ten is at least 39 cN/dtex, n is at least 25, f is a factor of at least 62.0 and dpf is the dtex per filament.
Claims
exact text as granted — not AI-modified1 . A process for manufacturing a multifilament yarn containing f filaments, wherein the process comprises the steps of:
(a) providing an ultrahigh molecular weight polyethylene (UHMWPE) solution comprised of UHMWPE polymer in a solvent for the UHMWPE polymer, wherein the UHMWPE solution comprises between 3 wt % and 12 wt % of the UHMWPE polymer and has an elongational strength (ES) of at least 0.4 N/mm 2 and at most 0.90 N/mm 2 ; (b) passing the solution of step (a) through a spinning plate containing n spin-holes to form the n filaments of the multifilament yarn; and (c) drawing the filaments in at least one drawing step before, during or after removing the solvent to thereby obtain a multifilament yarn with a tenacity (Ten) as expressed in cN/dtex according to Formula 1:
Ten
(
cN
/
dtex
)
=
f
×
n
-
0.05
×
d
p
f
-
0.15
(
Formula
1
)
wherein Ten is at least 39 cN/dtex, n is at least 25, f is a factor of at least 62.0 and dpf is the dtex per filament.
2 . The process according to claim 1 , wherein the UHMWPE solution comprises between 4 wt % and 10 wt % of the UHMWPE polymer, more preferably between 5 wt % and 9 wt % of the UHMWPE polymer, most preferably between 6 wt % and 8 wt % of the UHMWPE polymer.
3 . The process according to claim 1 , wherein the UHMWPE polymer has an elongational strength (ES) of at least 0.45 N/mm 2 and at most 0.85 N/mm 2 , more preferably at least 0.5 N/mm 2 and at most 0.80 N/mm 2 and most preferably at least 0.55 N/mm 2 and at most 0.75 N/mm 2 .
4 . The process according to claim 1 , wherein the UHMWPE polymer is a linear polyethylene further containing up to 5 mol % of one or more comonomers selected from the group consisting of propylene, 1-butene, 1-pentene, 4-methyl-1-pentene and 1-octene.
5 . The process according to claim 1 , wherein the solvent for the UHMWPE polymer is selected from the group consisting of aliphatic hydrocarbons, alicyclic hydrocarbons, mineral oil, kerosene, aromatic hydrocarbons, halogenated hydrocarbons, cycloalkanes, cycloalkenes and combinations thereof.
6 . The process according to claim 1 , wherein each of the n spin-holes of the spinning plate has a geometry comprising at least one contraction zone with a gradual decrease in diameter with a cone angle of below 60°, preferably below 50°, more preferably below 40°, from an initial diameter D 0 to a final diameter D n such that a draw ratio DR sp is achieved in the spin-hole.
7 . The process according to claim 6 , wherein each of the n spin-holes of the spinning plate has a downstream zone with constant diameter and a length/diameter ratio L n /D n of between 1 and 50.
8 . The process according to claim 1 , wherein step (b) comprises issuing the multifilament yarn from the spin-holes into an air gap and then into a quench zone, wherein the air gap has a length of between 1 mm and 20 mm, preferably between 2 mm and 15 mm, more preferably between 2 mm and 10 mm, and most preferably between 2 mm and 5 mm.
9 . The process according to claim 8 , wherein the multifilament yarn is drawn in the air gap with a draw ratio DR ag of between 2 and 20, preferably between 3 and 10, more preferably between 4 and 8.
10 . The process according to claim 1 , wherein step (b) is carried out at a spinning temperature below a boiling point of the solvent for the UHMWPE polymer, more preferably between 150° C. and 250° C.
11 . The process according to claim 10 , wherein the UHMWPE solvent is decaline and the spinning temperature is at most 210° C., more preferably at most 190° C., even more preferably at most 180° C., most preferably at most 170° C. and preferably at least 115° C., more preferably at least 120° C., most preferably at least 125° C.
12 . The process according to claim 10 , wherein the UHMWPE solvent is paraffin and the spinning temperature is below 220° C., more preferably between 130° C. and 200° C., most preferably between 130° C. and 195° C.
13 . The process according to claim 1 , wherein step (b) is practiced such that the UHMWPE solution has a throughput per spin-hole of the spinning plate which is between 1.0 and 3.0 g solution/min/hole, and wherein the UHMWPE polymer has an elongational strength (ES) of at least 0.60 N/mm 2 , more preferably an ES of at least 0.65 N/mm 2 and the spin-holes have a diameter D n of between 0.5 mm and 2 mm, most preferably between 0.8 mm and 1.2 mm.
14 . The process according to claim 1 , wherein step (d) is practiced after removal of the solvent and comprises at least one drawing step with a draw ratio of at least 3, more preferably at least 4 and more preferably at least 5.
15 . The process according to claim 14 , wherein step (d) comprises at least two drawing steps, preferably at least three drawing steps.
16 . The process according to claim 14 , wherein step (d) comprises more than two drawing steps, and wherein each of the drawing steps is carried out at a different temperature with an increasing profile between about 120° C. and 155° C. to achieve a desired drawing ratio without filament breakage occurring.
17 . A multifilament yarn made by the process according to claim 1 .
18 . A multifilament yarn containing f filaments of solution-spun ultra-high molecular weight polyethylene (UHMWPE), wherein the yarn has a tenacity (Ten) as expressed in cN/dtex according to Formula 1:
Ten
(
cN
/
dtex
)
=
f
×
n
-
0.05
×
d
p
f
-
0.15
(
Formula
1
)
wherein Ten is at least 39 cN/dtex, n is at least 25, f is a factor of at least 62.0 and dpf is the dtex per filament.
19 . A sheet comprising at least two monolayers, wherein each monolayer comprises unidirectionally aligned multifilament yarn according to claim 18 .
20 . A panel which comprises a plurality of sheets according to claim 19 .Cited by (0)
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