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Copolymers comprising polyamide blocks and polyether blocks and having improved mechanical propertiesCopolymers comprising polyamide blocks and polyether blocks and having improved mechanical properties description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20090023868, Copolymers comprising polyamide blocks and polyether blocks and having improved mechanical properties. Brief Patent Description - Full Patent Description - Patent Application Claims
The present invention relates to novel copolymers comprising polyamide blocks (abbreviated to PA block) and polyether blocks (abbreviated to PE block) having improved optical and/or mechanical properties. Such block copolymers are also known as polyether-block-amides (abbreviation PEBA). The PEBA copolymers of the invention belong to the specific category of the polyetheresteramides when they result from the copolycondensation of polyamide blocks comprising reactive carboxyl ends with polyether blocks comprising reactive ends which are polyether polyols (polyether diols), the bonds between the polyamide blocks and the polyether blocks being ester bonds, or also to the category of the polyetheramides when the polyether blocks comprise amine ends. The document EP 1 500 684 reports antistatic elastomeric compositions comprising a PEBA copolymer comprising PE blocks essentially made of PEG and PAX.Y blocks with X an aliphatic diamine, such as, for example, hexamethylenediamine and C9 to C25 diamines, and Y a C9 to C25 aliphatic diacid. These copolymers possessing antistatic properties do not come within the scope of our invention and are, of course, excluded as such. The document EP 1 262 527 relates to an antistatic polymer composition comprising a PEBA of PAX.Y type with, as aliphatic diamine X: hexamethylenediamine, dodecamethylenediamine and trimethylhexamethylenediamine, and, as aliphatic diacid Y: butanoic acid, adipic acid, azelaic acid, suberic acid, sebacic acid, dodecanedicarboxylic acid, dimerized fatty acids and polyoxyalkylene-α,ω-diacids. The PE blocks made of PEG, which confer the antistatic properties on the copolymer and on the composition, can be used with PPG blocks, indeed even with PTMG blocks. These copolymers do not come within the scope of our invention and are, of course, excluded as such. The document WO 03/050159 discloses PEBAs with, as hard segment, a PAX.Y block with X a linear aliphatic diamine comprising 4-14 carbon atoms and Y a linear aliphatic diacid comprising from 4 to 14 carbon atoms and with, as soft segment, PO3G, it being possible for the latter to comprise up to 60% by weight of another polyether, such as PEG, PPG and PTMG. These copolymers do not come within the scope of our invention and are, of course, excluded as such. The document WO 04/037898 has as subject matter a copolymer comprising PA blocks and PE blocks, the PA blocks of which are copolyamides which can be of the PAX1.Y1/X2.Y2 or PAX1.Y1/Z type, X1 and X2 being diamines, Y1 and Y2 being diacids and Z being a lactam or an amino acid. These copolymers do not come within the scope of our invention and are, of course, excluded as such. The Applicant Company has discovered, surprisingly, a novel category of PEBAs exhibiting improved optical properties, in particular a reduction in the opaqueness of the PEBAs, and/or improved mechanical properties, in particular a very good dynamic fatigue resistance. The subject matter of the present invention is thus, in the context of improved optical properties, a copolymer PAX.Y/PE comprising polyamide PA blocks alternating with polyether PE blocks, the PA blocks being composed of homopolyamide PAX.Y blocks obtained by polycondensation:
of a linear aliphatic diamine having X carbon atoms;
of a dicarboxylic acid having Y carbon atoms; said copolymer being characterized in that:
said PA blocks comprise carboxyl ends;
X is at least equal to 4, preferably at least equal to 6;
Y is at least equal to 10, preferably at least equal to 12;
said PE blocks:
(i) preferably, are either PE blocks comprising hydroxyl ends, otherwise known as PE diol blocks, so that the bonds between the PA blocks comprising carboxyl ends and the PE diol blocks are ester bonds;
(ii) preferably, or are PE blocks comprising NH2 ends in the case where Y has a number of carbon atoms of greater than 14, so that the bonds between the PA blocks comprising carboxyl ends and the PE blocks comprising NH2 ends are amide bonds;
(iii) comprise from 0 to 39% by weight of PO3G and/or PEG and from 100 to 61% by weight of polyether other than PO3G or PEG (% by weight, expressed with respect to the total weight of the copolymer);
characterized in that the copolymer PAX.Y/PE has improved optical transmission properties at 460 nm, at 560 nm and at 700 nm in comparison with a copolymer PA12/PTMG (iv) with the same size of PA block and with the same size of PE block respectively and/or (v) with the same stiffness, defined either by a flexural modulus (in MPa) or by a tensile modulus (in MPa) or by a Shore D hardness.
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