1. Copolyamide comprising the units resulting from the polycondensation reaction of the following precursors:
terephthalic acid (a),
an aliphatic diamine (b), which is preferably linear, comprising x carbon atoms, x being an integer between 6 and 22, and
an aminocarboxylic acid andor a lactam (c) comprising a main chain and at least one linear or branched alkyl branching, the total number of carbon atoms of the aminocarboxylic acid andor of the lactam (c) being between 12 and 36, optionally,
an aminocarboxylic acid andor a lactam (d) different from (c),
a dicarboxylic acid (e) different from the terephthalic acid (a),
a diamine (f) different from the aliphatic diamine (b).
2. Copolyamide according to claim 1, characterized in that the aminocarboxylic acid andor the lactam (c) comprises a total number of carbon atoms between 15 and 30, preferably between 18 and 24.
3. Copolyamide according to claim 1, characterized in that the main chain of the aminocarboxylic acid andor of the lactam (c) comprises between 6 and 18 carbon atoms, preferably between 10 and 12 carbon atoms.
4. Copolyamide according to claim 1, characterized in that the alkyl branching of the aminocarboxylic acid andor of the lactam (c) comprises at least 5 carbon atoms, advantageously at least 7 carbon atoms.
5. Copolyamide according to claim 1, characterized in that the aminocarboxylic acid (c) is chosen from N-heptyl-11-aminoundecanoic acid (18), N-heptyl-12-aminododecanoic acid (19), N-dodecyl-11-aminoundecanoic acid (23), N-dodecyl-12-aminododecanoic acid (24), N-octadecyl-11-aminoundecanoic acid (29) and N-octadecyl-12-aminododecanoic acid (30).
6. Copolyamide according to claim 1, characterized in that the aliphatic diamine (b) comprises between 6 and 18 carbon atoms and is, preferably, hexanediamine or decanediamine.
7. Copolyamide according to claim 1, characterized in that the aminocarboxylic acid andor the lactam (d) comprises a number of carbon atoms less than or equal to 12.
8. Copolyamide according to claim 7, characterized in that the aminocarboxylic acid (d) is chosen from 9-aminononanoic acid, 10-aminodecanoic acid, 11-aminoundecanoic acid and 12-aminododecanoic acid, preferably 11-aminoundecanoic acid.
9. Copolyamide according to claim 7, characterized in that the lactam (d) is chosen from caprolactam, decanolactam, undecanolactam and lauryl lactam, preferably lauryl lactam.
10. Copolyamide according to claim 1, characterized in that it comprises:
between 35 and 85 mol % of terephthalic acid (a) and of aliphatic diamine (b), and
between 15 and 65 mol % of aminocarboxylic acid andor of lactam (c).
11. Copolyamide according to claim 1, characterized in that it comprises:
between 35 and 85 mol % of terephthalic acid (a) and of aliphatic diamine (b), and
between 15 and 65 mol % of aminocarboxylic acid andor of lactam (c) and of amino-carboxylic acid andor of lactam (d).
12. Copolyamide according to claim 1, characterized in that it comprises:
between 35 and 85 mol % of terephthalic acid (a),
between 15 and 65 mol % of aminocarboxylic acid andor of lactam (c) and of dicarboxylic acid (e),
the molar content of aliphatic diamine (b) being equal to the sum of the molar contents of terephthalic acid (a) and of dicarboxylic acid (e).
13. Copolyamide according to claim 1, characterized in that it comprises:
between 35 and 85 mol % of terephthalic acid (a),
between 15 and 65 mol % of aminocarboxylic acid andor of lactam (c), of aminocarboxylic acid andor of lactam (d) and of dicarboxylic acid (e),
the molar content of aliphatic diamine (b) being equal to the sum of the molar contents of terephthalic acid (a) and of dicarboxylic acid (e).
14. Copolyamide according to claim 1, characterized in that it comprises:
between 35 and 85 mol % of terephthalic acid (a),
between 15 and 65 mol % of aminocarboxylic acid andor of lactam (c), of aminocarboxylic acid or of lactam (d), of dicarboxylic acid (e) and of diamine (f),
the molar content of aliphatic diamine (b) being greater than or equal to the molar content of terephthalic acid (a) and the sum of the molar contents of aliphatic diamine (b) and of diamine (f) being equal to the sum of the molar contents of terephthalic acid (a) and of dicarboxylic acid (e).
15. Copolyamide according to claim 1, characterized in that it corresponds to the formula: 186,T, 1810,T, 11186,T, 111810,T, 111910,T, 121910,T, 12186,T, 121810,T, 11236,T, 112310,T, 12236,T, 122310,T, 11246,T, 112410,T, 12246,T, 122410,T, 11296,T, 112910,T, 12296,T, 122910,T, 11306,T, 113010,T, 12306,T or 123010,T.
16. Process for preparing the copolyamide as defined in claim 1, characterized in that it comprises a step of polycondensation of the precursors (a), (b), (c) and, optionally, (d), (e) and (f).
17. Composition comprising at least one copolyamide as defined in claim 1.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for presenting images of a region of a subject obtained in a chronological sequence, each image being composed of a plurality of picture elements and each picture element having a value allocated thereto representing an appearance of that picture element in the image, comprising the steps of:
comparing respective values allocated to respective picture elements at identical locations in two of said images to identify a change of said value between said two of said images;
entering said change in a change log for said picture element relative to a time scale, and determining a point in time in said time scale at which said change is entered dependent on said two of said images allocating markings having different densities respectively to changes entered at different points in time in said change log;
allocating a marking to said picture element dependent on the entry in said change log; and
superimposing said marking at the location of said picture element in a selected image of said region.
2. A method as claimed in claim 1 comprising selecting said marking from the group consisting of colors and patterns.
3. A method as claimed in claim 1 comprising requiring a minimum difference between said respective values before designating said difference as representing a change in said picture element between said two of said images.
4. A method as claimed in claim 1 comprising, in said selected image, representing all picture elements, having respective values which exhibited no change between said two of said images, without any marking.
5. A method as claimed in claim 1 comprising allocating different markings to picture elements having respective change logs that differ.
6. A method as claimed in claim 1 comprising allocating identical markings to respective picture elements respectively having identical change logs.
7. A method as claimed in claim 1 comprising allocating markings having increasing densities respectively to changes allocated to later points in time.
8. A method as claimed in claim 1 comprising referencing said different densities relative to a first of said different points in time.
9. A method as claimed in claim 1 comprising referencing said different densities relative to a last of said different points in time.
10. A method as claimed in claim 1 comprising entering said change in said change log dependent on a directional scale determined by whether said change represents an increase or a decrease of said respective values.
11. A method as claimed in claim 10 comprising allocating different marking respectively to different directions in said change log.
12. A method as claimed in claim 11 comprising referencing said different markings to a chronologically first-occurring of said different directions.
13. A method as claimed in claim 11 comprising referencing said different markings to a chronologically last-occurring of said different directions.
14. A method as claimed in claim 1 comprising bringing said two of said images into coincidence before comparing said respective values.
15. A method as claimed in claim 1 comprising conducting said comparison by executing a mathematical calculation employing said respective values.
16. A method as claimed in claim 15 wherein said images in said sequence include a first image, and comprising successively comparing the respective values of pixels at identical locations in respective different sets of two of said images, each including said first image, by subtracting the respective values of said pixels from the value of said pixel in said first image, to obtain a plurality of difference images.
17. A method as claimed in claim 16 comprising mathematically combining said difference images with each other.
18. A method as claimed in claim 1 comprising generating said selected image with a higher resolution compared to other images in said sequence.
19. A method as claimed in claim 1 comprising employing grayscale values as said respective values for comparison.
20. A method as claimed in claim 1 comprising generating said images by magnetic resonance.
21. A method as claimed in claim 1 comprising generating said images in a functional magnetic resonance imaging sequence.