Filament article containing epoxy-amine curable composition

Patent metadata

Field	Value
Publication number	US-2023132198-A1
Application number	US-202117904880-A
Country	US
Kind code	A1
Filing date	Mar 16, 2021
Priority date	Mar 31, 2020
Publication date	Apr 27, 2023
Grant date	—

Abstract

A filament article containing a curable composition is provided. The filament article has a first part containing an epoxy resin and a second part containing a polyamine having at least two secondary or primary amino groups. The first part is surrounded by a sheath and a second part surrounded by a sheath. Either 1) the first part surrounded by the sheath and the second part surrounded by the sheath are each a separate filament or 2) the first part surrounded by the sheath and the second part surrounded by the sheath combine to form a composite filament. The curable filament article can be used to form a cured composition having structural bonding performance.

First claim

1 . A filament article comprising:
a) a curable composition comprising
1) a first part comprising an epoxy resin; and
2) a second part comprising a polyamine having at least two primary or secondary amino groups, wherein the second part is separated from the first part; and
b) a sheath surrounding the first part and the second part, wherein the sheath comprises a thermoplastic material that is non-tacky and wherein either
1) the first part surrounded by the sheath and the second part surrounded by the sheath are each a separate filament; or
2) the first part surrounded by the sheath and the second part surrounded by the sheath combine to form a composite filament.

2 . The filament article of claim 1 , wherein the first part surrounded by the sheath and the second part surrounded by the sheath are each a separate filament.

3 . The filament article of claim 1 , wherein the first part surrounded by the sheath and the second part surrounded by the sheath combine to form a composite filament.

4 . The filament article of claim 1 , wherein the filament article comprises 0.1 to 25 weight percent sheath based on a total weight of the filament article minus any optional filler.

5 . The filament article of claim 1 , wherein the first part and the second part are semi-solids.

6 . The filament article of claim 1 , wherein the first part and/or the second part further comprises a film-forming resin.

7 . The filament article of claim 1 , wherein the polyamine comprises an amine-terminated oxamide and/or a polyether diamine.

8 . The filament article of claim 1 , wherein a ratio of equivalents of epoxy groups in the first part to equivalents of active hydrogen atoms of the polyamine in the second part is in a range of 0.8 to 1.2.

9 . A method of making a filament article comprising a curable composition, the method comprising:
forming (or providing) a first part comprising an epoxy resin; and forming (or providing) a second part comprising a polyamine having at least two primary or secondary amino group, wherein the second part is separated from the first part; surrounding each of the first part and the second part with a sheath that includes a thermoplastic resin that is non-tacky, wherein either
1) the first part surrounded by the sheath and the second part surrounded by the sheath are each a separate filament; or
2) the first part surrounded by the sheath and the second part surrounded by the sheath combine to form a composite filament.

10 . A method of printing and bonding, the method comprising:
providing a filament article according to claim 1 ; melting and blending the filament article to form a molten composition; dispensing the molten composition through a nozzle onto at least a first portion of a first substrate; and positioning either a second substrate or a second portion of the first substrate in contact with the molten composition; and forming a structural adhesive bond between at least the first portion of the first substrate and either the second substrate or the second portion of the first substrate.

Assignees

• 3M Innovative Properties Company

Inventors

• Sorenson Gregory P
• Behling Ross E
• Thomas John Christopher

Classifications

• B29C64/118

  using filamentary material being melted, e.g. fused deposition modelling [FDM] · CPC title

• C08G59/56

  together with other curing agents · CPC title

• C08G59/50 Primary

  Amines · CPC title

• B33Y70/00

  Materials specially adapted for additive manufacturing · CPC title

• C09J163/00

  Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins · CPC title