US 12,168,319 B2
Method for applying a material containing a meltable polymer, more particularly a hot-melt adhesive, above the decomposition temperature thereof
Dirk Achten, Leverkusen (DE); Thomas Buesgen, Leverkusen (DE); Joerg Tillack, Solingen (DE); Peter Reichert, Dormagen (DE); Nicolas Degiorgio, Krefeld (DE); Martin Melchiors, Leichlingen (DE); and Wolfgang Arndt, Dormagen (DE)
Assigned to Covestro Intellectual Property GmbH & Co. KG, Leverkusen (DE)
Appl. No. 16/965,717
Filed by Covestro Intellectual Property GmbH & Co. KG, Leverkusen (DE)
PCT Filed Feb. 13, 2019, PCT No. PCT/EP2019/053573
§ 371(c)(1), (2) Date Jul. 29, 2020,
PCT Pub. No. WO2019/158599, PCT Pub. Date Aug. 22, 2019.
Claims priority of application No. 18157167 (EP), filed on Feb. 16, 2018.
Prior Publication US 2021/0031435 A1, Feb. 4, 2021
Int. Cl. B29C 64/118 (2017.01); B33Y 10/00 (2015.01); C08G 18/32 (2006.01); C09J 175/06 (2006.01)
CPC B29C 64/118 (2017.08) [B33Y 10/00 (2014.12); C08G 18/3221 (2013.01); C09J 175/06 (2013.01); C08G 2170/20 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method of applying a material comprising a fusible polymer, comprising:
applying a filament of the fusible polymer comprising an at least partly molten material from a discharge opening of a discharge element to a substrate;
wherein the fusible polymer has the following properties:
a melting point within a range from ≥40° C. to ≤120° C. based on a differential scanning calorimetry 2nd heating at a heating rate of 5° C./min;
a glass transition temperature within a range from ≥−70° C. to ≤30° C. based on dynamic-mechanical analysis according to DIN EN ISO 6721-1:2011;
a storage modulus G′ at 20° C. above the melting point of ≥1·104 Pa based on ISO 6721-10:2015 using a plate/plate oscillation viscometer at a frequency of 1/s;
a storage modulus G′ at 10° C. below the melting point with prior heating to a temperature of 20° C. above the melting point and subsequent cooling at a cooling rate of 1° C./min of ≤1·107 Pa based on ISO 6721-10:2015 using a plate/plate oscillation viscometer at a frequency of 1/s;
wherein the filament is applied at an application temperature of ≥100° C. above the melting point of the fusible polymer for ≤5 minutes,
wherein, at a maximum application temperature attained during melting of the fusible polymer, the fusible polymer has a storage modulus G′ that is smaller by a factor of ≥10 than the storage modulus G′ at a temperature of 20° C. above the melting point of the fusible polymer based on ISO 6721-10:2015 using a plate/plate oscillation viscometer at a frequency of 1/s, and
wherein the fusible polymer comprises at least one of polyurethane, polyester, or a combination thereof.