US 12,359,042 B2
Fiber-blended heterophasic copolymer for additive-manufacture feedstock
Jacob Fallon, Pittsburgh, PA (US); Alexandre Di Pintor Da Luz, Pittsburgh, PA (US); Michelle Sing, Pittsburgh, PA (US); and Kevin Herrington, Pittsburgh, PA (US)
Assigned to BRASKEM AMERICA, INC., Philadelphia, PA (US)
Filed by BRASKEM AMERICA, INC., Philadelphia, PA (US)
Filed on Mar. 22, 2022, as Appl. No. 17/701,063.
Claims priority of provisional application 63/164,324, filed on Mar. 22, 2021.
Prior Publication US 2022/0298328 A1, Sep. 22, 2022
Int. Cl. C08K 9/06 (2006.01); C08K 3/04 (2006.01); C08K 5/54 (2006.01); C08K 7/06 (2006.01); C08K 7/14 (2006.01)
CPC C08K 9/06 (2013.01) [C08K 3/04 (2013.01); C08K 5/5403 (2013.01); C08K 7/06 (2013.01); C08K 7/14 (2013.01)] 27 Claims
OG exemplary drawing
 
1. An additive-manufacture feedstock, comprising:
a heterophasic copolymer having a melt flow rate of from 0.1 to 150 g/10 min (230° C./2.16 kg), measured according to ASTM D 1238, and
a first-fiber blended in the heterophasic copolymer,
wherein:
the first-fiber is present in the additive-manufacture feedstock in an amount of from 1.0 to 40 wt %, relative to 100 wt % of the additive-manufacture feedstock, and
the first-fiber-blended heterophasic copolymer, when in the form of a printed article, exhibits a warpage resistance rating of at most 1 mm, measured according to the following equation and 48 hours after printing the printed article:

OG Complex Work Unit Math
wherein:
Σi=1N WSi sums the values of WSi, starting at WS1 and ending with WSN,
N is the total number of printed articles measured for warpage resistance rating evaluation,
i is a ith printed article measured,
WSi=Max (X1,X2,X3,X4)i−Min (Y1,Y2,Y3,Y4)i for a ith printed article measured,
X1, X2, X3, and X4, respectively, represent a height of a first central edge, a height of a second central edge, a height of a third central edge, and a height of a fourth central edge, of the ith printed article measured,
Y1, Y2, Y3, and Y4, respectively, represent a height of a first corner edge, a height of a second corner edge, a height of a third corner edge, and a height of a fourth corner edge, of the ith printed article measured,
Max (X1,X2,X3,X4)i represents the maximum value of X1, X2, X3, and X4, for the ith printed article measured, and
Min (Y1,Y2,Y3,Y4)i represents the minimum value of Y1, Y2, Y3, and Y4, for the ith printed article measured,
wherein each printed article measured for warpage resistance rating evaluation is a 60 mm×60 mm×60 mm cubic box, each side of the cubic box having a thickness of 1 mm.