EP 4321664 A1 20240214 - POLYVINYL ALCOHOL FIBRES AND MELTBLOWN FIBROUS PRODUCTS
Title (en)
POLYVINYL ALCOHOL FIBRES AND MELTBLOWN FIBROUS PRODUCTS
Title (de)
POLYVINYLALKOHOLFASERN UND SCHMELZGEBLASENE FASERPRODUKTE
Title (fr)
FIBRES D'ALCOOL POLYVINYLIQUE ET PRODUITS FIBREUX PAR FUSION-SOUFFLAGE
Publication
Application
Priority
EP 22190328 A 20220813
Abstract (en)
A method of manufacture of a nonwoven product comprising polyvinyl alcohol fibres, the method comprising the steps of:providing a polyvinyl alcohol composition comprising homopolymeric polyvinyl alcohol having a degree of hydrolysis of 88% to 98% or greater; and a molecular weight in the range from 22,000 to 38,000a plasticiser selected from the group consisting of: sugar alcohols, diols, triols, polyols and mixtures thereof; anda stabilizer selected from the group consisting of: sodium stearate, potassium oleate, sodium benzoate, calcium stearate, stearic acid, dimethyl, propionic acid and mixtures thereof;melting the composition at a temperature from 220°C to 230°C to form a molten polymer;wherein the molten polymer is meltblown by the steps of:extrusion of the molten polymer through a die having a spinneret to form molten fibres of the polymer;the fibres being blown from the die and attenuated by a flow of heated air to form attenuated molten fibres, the attenuated fibres being deposited on a moving collector and allowed to solidify to form a meltblown nonwoven fibre web.
IPC 8 full level
D04H 1/56 (2006.01); D01D 5/08 (2006.01); D01F 1/10 (2006.01); D01F 6/14 (2006.01); D04H 3/007 (2012.01); D04H 3/16 (2006.01)
CPC (source: EP)
D01D 5/0985 (2013.01); D01F 1/10 (2013.01); D01F 6/14 (2013.01); D04H 1/56 (2013.01); D04H 3/007 (2013.01); D04H 3/16 (2013.01)
Citation (applicant)
- WO 2017046361 A1 20170323 - AQUAPAK POLYMERS LTD [GB]
- WO 2022008521 A1 20220113 - AQUAPAK POLYMERS LTD [GB]
- WO 2022008516 A1 20220113 - AQUAPAK POLYMERS LTD [GB]
Citation (search report)
- [I] US 5207837 A 19930504 - HONEYCUTT TRAVIS W [US]
- [X] US 2003216098 A1 20031120 - CARLYLE THOMAS [US], et al
- [I] US 2017369693 A1 20171228 - MORRIS PETER [GB]
- [A] WO 2021262929 A1 20211230 - MONOSOL LLC [US]
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
EP 4321664 A1 20240214; EP 4321667 A1 20240214; WO 2024037991 A1 20240222
DOCDB simple family (application)
EP 22190328 A 20220813; EP 2023072333 W 20230811; EP 23191163 A 20230811