Use of a reinforced thermoplastic composition

Abstract

The field of molded articles and fiber-reinforced thermoplastic compositions for obtaining them. The use of the reinforced thermoplastic composition for obtaining a thin molded article with reduced warpage. The composition may include: from 30 to 70% by weight of an amorphous polyamide matrix by total weight of the composition; from 30 to 70% by weight of glass fibers with a circular cross-section by total weight of the composition; and optionally additives.

1 . Use of a fiber-reinforced thermoplastic composition for obtaining a molded article having a reduced warpage, wherein the composition comprises:
 from 30 to 70% by weight of an amorphous polyamide matrix by total weight of the composition; and,   from 30 to 70% by weight of glass fibers with a circular cross-section by total weight of the composition; and,   optionally additives;   wherein the amorphous polyamide matrix comprises at least one amorphous polyamide and at least one aliphatic semi-crystalline polyamide;   wherein the fiber-reinforced thermoplastic composition has a melt viscosity of at most 1,300 Pa·s, when measured at a shear rate of 110 s −1  at 260° C. according to the ISO11443:2014 standard;   wherein the weight ratio between the amorphous polyamide and the aliphatic semi-crystalline polyamide in the amorphous polyamide matrix is from 60:40 to 90:10;   wherein the amorphous polyamide is selected from the group consisting of homopolyamides of formula X 1 Y 1 , copolyamides of formula Z 1 /X 1 Y 1  and/or copolyamides of formula X 0 Y 0 /X 1 Y 1 ;   wherein the unit X 1  is derived from a cycloaliphatic diamine monomer having from 8 to 18carbons or a mixture of at least two of these monomers thereof;   wherein the unit Y 1  is derived from a linear aliphatic diacid monomer having from 4 to 36 carbons or a mixture of at least two of these monomers thereof; or wherein the unit Y 1 is derived or an aromatic diacid having from 6 to 18 carbons or a mixture of at least two of these monomers thereof;   wherein the unit Z 1 , if present, is derived from an amino acid monomer having from 9 to 18 carbons or a lactam monomer having from 6 to 18 carbons;   wherein the unit X 0 , if present, is derived from a linear aliphatic diamine monomer having from 4 to 18 carbons or a mixture of at least two of these monomers thereof;   wherein the unit Y 0 , if present, is derived from a linear aliphatic diacid monomer having from 4 to 36 carbons or a mixture of at least two of these monomers thereof;   wherein the aliphatic semi-crystalline polyamide is selected from the group consisting of polyamides of formula Z 2  and/or polyamides of formula X 2 Y 2 ; wherein the unit Z 2 , if present, is derived from an amino acid having from 9 to 18 carbons; or a lactam having from 6 to 18 carbons; wherein the unit X 2 , if present, is derived from an aliphatic diamine monomer from 4 to 18 carbons, or mixtures thereof; and wherein the unit Y 2 , if present, is derived from a linear aliphatic diacid monomer having from 4 to 36 carbons, or mixtures thereof.   
     
     
         2 . Use according to  claim 1 , wherein the amino acid monomer, from which the unit Z 1  is derived, if present, is selected from the group consisting of 9-aminononanoic acid, 10-aminodecanoic acid, 10-aminoundecanoic acid, 11-aminoundecanoic acid, 12-aminododecanoic acid, and derivatives thereof, especially N-heptyl-11-aminoundecanoic acid; or the lactam monomer, from which the unit Z 1  is alternatively derived, if present, is selected from the group consisting of caprolactam, pelargolactam, decanolactam, undecanolactam, lauryllactam, pyrrolidinone, 2-piperidinone, enantholactame, caprylolactam, and derivatives thereof;
 wherein the cycloaliphatic diamine monomer, from which the unit X 1  is derived, is selected from the group consisting of bis (3,5-dialkyl-4-aminocyclohexyl)methane, bis(3,5-dialkyl-4-aminocyclohexyl)ethane, bis(3,5-dialkyl-4-aminocyclohexyl)propane, bis(3,5-dialkyl-4-aminocyclohexyl)butane, bis(3-methyl-4-aminocyclohexyl)methane, p-bis(aminocyclohexyl) methane, isopropylidenedi(cyclohexylamine), isophorone-diamine, 2,6-bis(amino methyl)norbornane, bis(aminomethyl)cyclohexane;   wherein the linear aliphatic diamine monomer, from which the unit X 0  is derived, if present, is selected from the group consisting of 1,4-butanediamine, 1,5-pentanediamine, 1,6-hexanediamine, 1,7-heptanediamine, 1,8-octanediamine, 1,9-nonanediamine, 1,10-decanediamine, 1,11-undecanediamine, 1,12-dodecanediamine, 1,13-tridecanediamine, 1,14-tetradecanediamine, 1,15-pentadecanediamine, 1,16-hexadecanediamine, 1,17-heptadecanediamine, 1,18-octadecanediamine, or mixtures thereof;   wherein the linear aliphatic diacid monomer, from which the unit Y 1 and/or the unit Y 0  is derived, if present, is selected from the group consisting of succinic acid, pentanedioic acid, adipic acid, heptanedioic acid, octanedioic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, brassylic acid, tetradecanedioic acid, hexanedecanedioic acid, octadecanedioic acid, eicosanedioic acid, docosanedioic acid, fatty acid dimers containing 36 carbons, or mixtures thereof; or the aromatic diacid monomer, from which the unit Y 1  is derived, is selected from the group consisting of terephtalic acid, isophtalic acid, naphthalenedicarboxylic acid, and mixtures thereof.   
     
     
         3 . Use according to  claim 1 , wherein the amorphous polyamide is a polyamide of formula Z 1  /X 1  Y 1 . 
     
     
         4 . Use according to  claim 1 , wherein the amorphous polyamide is a polyamide of formula Z 1 /X 1 Y 1 , wherein the unit Z 1  is derived from 11-aminoundecanoic acid, the unit X 1  is derived from bis(3-methyl-4-aminocyclohexyl)methane, and the unit Y 1  is derived from sebacic acid. 
     
     
         5 . Use according to  claim 1 , wherein the aliphatic semi-crystalline polyamide is a polyamide of formula Z 2 , wherein the unit Z 2  is derived from an amino acid monomers being selected from selected from the group consisting of 9-aminononanoic acid, 10-aminodecanoic acid, 10-aminoundecanoic acid, 11-aminoundecanoic acid, 12-aminododecanoic acid, derivatives thereof, especially N-heptyl-11-aminoundecanoic acid. 
     
     
         6 . Use according to  claim 1  , wherein the aliphatic semi-crystalline polyamide is a polyamide of formula X 2 Y 2;  
 wherein the aliphatic diamine monomer, from which the unit X 2  is derived, is selected from the group consisting of 1,4-butanediamine, 1,5-pentanediamine, 1,6-hexanediamine, 1,7-heptanediamine, 1,8-octanediamine, 1,9-nonanediamine, 1,10-decanediamine, 1,11-undecanediamine, 1,12-dodecanediamine, 1,13-tridecanediamine, 1,14-tetradecanediamine, 1,15-pentadecanediamine, 1,16-hexadecanediamine, 1,17-heptadecanediamine, 1,18-octadecanediamine, or mixtures thereof; 
 wherein the linear aliphatic diacid monomer, from which the unit Y 2  is derived, is selected from the group consisting of succinic acid, pentanedioic acid, adipic acid, heptanedioic acid, octanedioic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, brassylic acid, tetradecanedioic acid, hexanedecanedioic acid, octadecanedioic acid, eicosanedioic acid, docosanedioic acid, fatty acid dimers containing 36 carbons, or mixtures thereof. 
 
     
     
         7 . Use according to  claim 1 , wherein the aliphatic semi-crystalline polyamide is a polyamide of formula X 2 Y 2 , wherein the aliphatic diamine monomer, from which the unit X 2  is derived, is 1-10-decanediamine; and wherein the linear aliphatic diacid monomer, from which the unit Y 2  is derived, is sebacic acid. 
     
     
         8 . Use according to  claim 1 , wherein the glass fibers with a circular cross-section have a diameter from 4 to 25 μm. 
     
     
         9 . Use according to  claim 1 , wherein the composition further comprises calcium stearate. 
     
     
         10 . Use according to  claim 1 , wherein the composition further comprises additive compounds.