Core-sheath filaments and methods of printing an adhesive

Patent metadata

Field	Value
Publication number	US-12104288-B2
Application number	US-201916767330-A
Country	US
Kind code	B2
Filing date	Feb 8, 2019
Priority date	Feb 21, 2018
Publication date	Oct 1, 2024
Grant date	Oct 1, 2024

Abstract

The present disclosure provides a core-sheath filament. The core-sheath filament includes an adhesive core and a non-tacky sheath, wherein the sheath exhibits a melt flow index of less than 15 grams per 10 minutes. The present disclosure also provides a method of printing an adhesive. The method includes a) melting a core-sheath filament in a nozzle to form a molten composition, and b) dispensing the molten composition through the nozzle onto a substrate. Steps a) and b) are carried out one or more times to form a printed adhesive. The core-sheath filament includes an adhesive core and a non-tacky sheath. Further, methods are provided, including receiving, by a manufacturing device having one or more processors, a digital object comprising data specifying an article; and generating, with the manufacturing device by an additive manufacturing process using a core-sheath filament, the article including a printed adhesive based on the digital object. A system is also provided, including a display that displays a 3D model of an article; and one or more processors that, in response to the 3D model selected by a user, cause a 3D printer to create a physical object of an article including a printed adhesive, using a core-sheath filament.

First claim

The invention claimed is:

1. A method of printing an adhesive, comprising:
a. melting a core-sheath filament comprising an adhesive core and a non-tacky sheath in a nozzle to form a molten composition, the non-tacky sheath exhibiting a melt flow index of less than 15 grams per 10 minutes (g/10 min) and an elongation at break of 100% or more, and the adhesive core being a pressure-sensitive adhesive and comprised of a styrenic block copolymer and a tackifier,
wherein the styrenic block copolymer has a glassy block comprising polystyrene and a rubbery block comprising poly (isoprene), poly (butadiene), or poly (isoprene/butadiene), and
wherein the styrenic block copolymer comprises 5 to 50 weight percent glassy blocks and the remainder of the weight of the styrenic block copolymer is attributable to the rubbery blocks; and

b. dispensing the molten composition through the nozzle onto a substrate;
wherein steps a. and b. are carried out one or more times to form a printed adhesive.

2. The method of claim 1 , wherein the molten composition is mixed in the nozzle, during dispensing through the nozzle, or both.

3. The method of claim 1 , wherein the printed adhesive comprises an integral shape that varies in thickness in an axis normal to the substrate.

4. The method of claim 1 , wherein the printed adhesive forms a discontinuous pattern on the substrate.

5. The method of claim 1 , wherein the sheath consists of one or more materials that are functional components of the adhesive of the adhesive core.

Assignees

• 3M Innovative Properties Company

Inventors

• Nyaribo Eric O
• Chastek Thomas Q
• Waid Robert D
• Devolder Ross J
• Young Jacob D
• West Shaun M
• Belkin Mikhail A
• Dingeldein Joseph C
• Esch Jay A
• Napierala Mark E

Classifications

• B33Y10/00

  Processes of additive manufacturing · CPC title

• B33Y70/10

  Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials · CPC title

• C09J2301/202

  the adhesive being in the form of fibres · CPC title

• C09J2453/00

  Presence of block copolymer · CPC title

• B29C64/209

  Heads; Nozzles · CPC title