	US 11,746,233 B2
	Use of circular-section glass fibres in a mixture comprising a semi-aromatic polyamide and an aliphatic polyamide to improve the mechanical properties of said mixture
Benoît Brule, Beaumont-le-Roger (FR); Antoine Breuil, Tokyo-to (JP); Hao Wang, Jiangsu (CN); and Xiong Yao, Jiangsu (CN)
Assigned to Arkema France, Colombes (FR)
Appl. No. 16/342,368
Filed by Arkema France, Colombes (FR)
PCT Filed Oct. 18, 2017, PCT No. PCT/FR2017/052867 § 371(c)(1), (2) Date Apr. 16, 2019, PCT Pub. No. WO2018/073537, PCT Pub. Date Apr. 26, 2018.
Claims priority of application No. 1660126 (FR), filed on Oct. 19, 2016; and application No. 1752407 (FR), filed on Mar. 23, 2017.
Prior Publication US 2019/0241739 A1, Aug. 8, 2019
Int. Cl. C08L 77/06 (2006.01); C08K 7/14 (2006.01); C08L 77/02 (2006.01)

CPC C08L 77/06 (2013.01) [C08K 7/14 (2013.01); C08L 77/02 (2013.01); C08L 2203/20 (2013.01); C08L 2205/025 (2013.01)]

10 Claims

1. A method for improving elongation at break of a polyamide MXDZ/A mixture, the method comprising:

adding circular-section glass fibres to the polyamide MXDZ/A mixture to produce a fiber-reinforced mixture, and

processing the fiber-reinforced mixture;

wherein the polyamide MXDZ/A mixture comprises:

at least one MXDZ polyamide, obtained from the polycondensation of meta-xylylenediamine (MXD), with a C₆to C₁₈aliphatic dicarboxylic acid (Z),

at least one aliphatic polyamide A obtained from the polycondensation of a unit selected from:

a C₆to C₁₂lactam,

a C₆to C₁₂amino acid, and

an XY unit obtained from the polycondensation of a C₄to C₁₈aliphatic diamine (X), and a C₆to C₁₈aliphatic dicarboxylic acid (Y), and

optionally at least one impact modifier and/or at least one additive,

wherein the circular-section glass fibres contribute from 30 to 75% by weight with respect to the total weight of the fiber-reinforced mixture; and

wherein after processing, the elongation at break of the fiber-reinforced mixture is increased from 10% to 30% when compared to the same mixture comprising flat-section glass fibres instead of the circular-section glass fibres.