PEBA-based composition and use thereof for producing a fatigue-resistant transparent object

Patent metadata

Field	Value
Publication number	US-11359052-B2
Application number	US-201816612110-A
Country	US
Kind code	B2
Filing date	May 4, 2018
Priority date	May 11, 2017
Publication date	Jun 14, 2022
Grant date	Jun 14, 2022

Abstract

The present invention relates to a copolymer with a rigid polyamide block and a flexible polyether or polyester block, wherein said polyamide block is semicrystalline and consists of a copolyamide of W/Y.Z type, wherein:(i) W is a lactam or an alpha, omega-aminocarboxylic acid;(ii) Y is a cycloaliphatic diamine;(iii) Z is an aliphatic and/or aromatic dicarboxylic acid; and the W/Y.Z molar ratio is between 10/1 and 27/1 limits excluded.

First claim

The invention claimed is:

1. A copolymer with a rigid polyamide (PA) block and a flexible polyether or polyester (PE) block, wherein said polyamide block is semicrystalline and consists of a copolyamide of W/Y.Z type, wherein:
(i) W is a lactam or an alpha,omega-aminocarboxylic acid;
(ii) Y is a cycloaliphatic diamine;
(iii) Z is a first aliphatic and/or aromatic dicarboxylic acid;

and the W/Y.Z molar ratio is between 14/1 and 20/1 limits excluded, wherein the W/Y.Z molar ratio is a comparison of the moles of monomer W to the total moles of monomer Y.Z, and wherein monomer Y.Z is an equimolar combination of units Y and Z.

2. The copolymer as claimed in claim 1 , wherein the W/Y.Z molar ratio is between 14/1 to 15/1 limits excluded.

3. The copolymer as claimed in claim 1 , wherein the percentage by weight of the various components is such that:
(i) the percentage of the monomer W is within the range of 75% and 98% by weight;
(ii) the percentage of the Y.Z monomer is within the range of 2% and 25%;
forming a total of 100% of the polyamide block.

4. The copolymer as claimed in claim 1 , wherein the percentage of polyamide blocks in the copolymer is within the range of from 60% to 97%, and the percentage of polyether blocks in the copolymer is within the range of from 3% to 40%.

5. The copolymer as claimed in claim 1 , wherein W is chosen from: caprolactam, oenantholactam, lauryllactam, aminocaproic acid, 7-aminoheptanoic acid, 11-aminoundecanoic acid and 12-aminododecanoic acid.

6. The copolymer as claimed in claim 1 , wherein the cycloaliphatic diamine Y is chosen from: bis(3,5-dialkyl-4-aminocyclohexyl)methane, bis(4-aminocyclohexyl)methane (BACM), bis(3,5-dialkyl-4-aminocyclohexyl)ethane, bis(3,5-dialkyl-4-aminocyclohexyl)propane, 2,2-bis(3-methyl-4-aminocyclohexyl)propane (BMACP), bis(3,5-dialkyl-4-aminocyclohexyl)butane, bis(3-methyl-4-aminocyclohexyl)methane (BMACM or MACM), p-bis(aminocyclohexyl)methane (PACM), isopropylidenedi(cyclohexylamine) (PACP), isophoronediamine (IPD), 2,6-bis(aminomethyl)norbornane (BAMN).

7. The copolymer as claimed in claim 1 , wherein the first aliphatic and/or aromatic dicarboxylic acid is chosen from aliphatic and/or aromatic dicarboxylic acids having from 6 to 36 carbon atoms.

8. The copolymer as claimed in claim 1 , wherein:
the number-average molecular mass of the PA blocks is within the range of from 500 to 18 000 g/mol; and
the number-average molecular mass of the PE blocks is within the range of from 500 to 2000 g/mol.

9. The copolymer as claimed in 1 , wherein the PE blocks are derived from at least one polyalkylene ether polyol.

10. The copolymer as claimed in claim 9 , wherein the polyalkylene ether diol is chosen from polyethylene glycol (PEG), polypropylene glycol (PPG), polytrimethylene glycol (PO3G), polytetramethylene glycol (PTMG) and mixtures thereof.

11. The copolymer as claimed in claim 1 , wherein it has:
a transparency such that the transmittance at 560 nm through a 2-mm thick sheet is at least 80%;
a melting point within the range of from 130° C. to 210° C.; and
a crystallinity such that the enthalpy of fusion (delta Hm(2)) during the second heating is within the range of from 30 to 60 J/g;
the melting point and the enthalpy of fusion being measured according to the ISO 11357-3: 2013 DSC standard.

12. A process for preparing a copolymer as defined in claim 1 , comprising the steps of:
preparing the polyamide PA blocks by polycondensation in a first step, wherein the polyamide PA blocks are prepared from
the lactam or an alpha,omega-aminocarboxylic acid W;
the cycloaliphatic diamine Y and the first aliphatic and/or aromatic dicarboxylic acid Z;
wherein the polyamide PA blocks are optionally prepared in the presence of a chain stopper chosen from a second dicarboxylic acid; and
reacting the polyamide PA blocks W/Y.Z obtained with the polyether PE blocks in a second step, in the presence of a catalyst.

13. A process for preparing a copolymer as defined in claim 1 , wherein the process comprises a one-step polycondensation with:
the lactam or alpha,omega-aminocarboxylic acid W;
the cycloaliphatic diamine Y and the first aliphatic and/or aromatic dicarboxylic acid Z;
optionally a chain stopper chosen from a second dicarboxylic acid;
the polyether PE blocks; and
a catalyst.

14. A shaped article which is transparent, comprising a copolymer as defined in claim 1 .

15. The shaped article as claimed in claim 14 , wherein the article is selected from the group consisting of an article of sports equipment or a component of an article of sports equipment; a motor vehicle component; tanks; an industrial, electrical, an electronic or computer part, a tablet, a telephone, a computer, a safety accessory, a sign, a cornice lighting, an information and advertising panel, a display case, an engraving, a furnishing, a shopfitting, a decoration, a contact ball, a dental prosthesis, an implant, an ophthalmology article, a hemodialysis membrane, optical fibers, a work of art, a sculpture, camera lenses, disposable camera lenses, a printing substrate for direct printing with UV inks for photographic pictures, a glazing, and a sunroof.

Assignees

• Arkema France

Inventors

• Turan-Altuntas Inci
• Pineau Quentin
• Blondel Philippe
• Sabard Mathieu

Classifications

• C08G69/36

  derived from amino acids, polyamines and polycarboxylic acids · CPC title

• C08G69/40 Primary

  Polyamides containing oxygen in the form of ether groups (C08G69/12, C08G69/32 take precedence) · CPC title