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US 12,612,511 B2Granted
Flame retardant polyamide-based 3D printing extrusion materials
AssigneeStratasys, Inc.
InventorsDavid McCann, Joanna Marguier, Sebastian Hörold
Life of this patent
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Abstract
The present invention relates to a fire, smoke and toxicity retardant (FST) polyamide thermoplastic mass usable for 3D printing which comprises at least one non-halogenated organic flame retardant in combination with at least one particulate inorganic flame retardant. Moreover, the present invention refers to uses of such FST polyamide thermoplastic mass for 3D printing. The invention further relates to methods of preparing a three-dimensionally shaped product by means of 3D printing based on such FST polyamide thermoplastic mass.
Claims11
A thermoplastic mass usable for 3D printing comprising:
- (A) 55 to 80% by weight of component A;
- (B) 13% by weight of component B;
- (C) 7% by weight of component C;
- (D) 10 to 25% by weight of component D;
- and
- (E) 0.1 to 1% by weight of component E;
- wherein component A comprises a polyamide;
- wherein component B comprises a non-halogenated organic flame retardant selected from the group consisting of a dialkylphosphinic salt of the formula (I), a diphosphinic salt of the formula (II), or a combination thereof,
- in which
- R1 and R2 are identical or different and are C1-C6-alkyl, linear or branched or H;
- R3 is C1-C10-alkylene, linear or branched, C6-C10-arylene, C7-C20-alkylarylene, or C7-C20-arylalkylene;
- M is selected from the group consisting of Sb, Sn, Ge, Fe, Zr, Ce, Bi, Sr, Mn, Li, Na, K, and a protonated nitrogen base;
- m is from 1 to 4;
- n is from 1 to 4;
- and
- x is from 1 to 4;
- wherein component C comprises a particulate inorganic flame retardant selected from the group consisting of particulate zinc phosphate complex, Al(OH)O, zinc oxide/phosphate complex, basic zinc phosphate complex, calcium zinc molybdate complex, and mixtures of two or more thereof;
- wherein component D comprises a reinforcing or filler material;
- wherein component E comprises at least one aromatic di- or tricarboxylic ester/amide;
- and at least one stabilizer having a CAS number selected from the group consisting of 119345-01-6, 2082-79-3, 6683-19-8, 32509-66-3, 90498-90-1, 40601-76-1, 27676-62-6, 10191-41-0, 10081-67-1, 181314-48-7, 143925-92-2, 31570-04-4, 26741-53-7, 693-36-7, 2500-88-1, 1843-05-6, 25973-55-1, 05.11.3896, 147-75-9, 3864-99-1, 2440-22-4, 155633-54-8, 70321-86-7, 2725-22-6, 147315-50-2, 14516-71-3, 2403-88-5411, 52829-07-9, 167078-06-0 (24860-22-8), 124172-53-8, 65447-77-0, 71878-19-8 (70624-18-9), 82451-48-7, 106990-43-6, and combinations thereof;
- wherein the thermoplastic mass is in the form of a spooled filament used for 3D printing;
- wherein the thermoplastic mass has a surface flammability ≤25 and not less than 8;
- and
- wherein the thermoplastic mass has a specific optical density ≤165 and not less than 94.
21 more elements
Dependencies are inferred from the claim text.