Semi-crystalline semi-aromatic polyamide
AssigneeDsm IP Assets B.V.
InventorsRudy Rulkens, Robert C. B. Crombach
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Abstract
The invention relates to a semi-crystalline semi-aromatic polyamide comprising A-A-B-B units derived from (a) dicarboxylic acids consisting of a mixture of aromatic dicarboxylic acid and aliphatic dicarboxylic acid and (b) diamines consisting of a mixture of long chain aliphatic diamine and short chain aliphatic diamine, wherein (a-i) the aromatic dicarboxylic acid consists for at least 80 mole % of terephthalic acid, and (a-ii) the aliphatic dicarboxylic acid constitutes at least 5 mole % of the dicarboxylic acids, (b-i) the short chain aliphatic diamine constitutes at least 10 mole % of the diamines, and (c) the aromatic dicarboxylic acid and the long chain aliphatic diamine constitute 60-90 mole % of the total molar amount of dicarboxylic acids and diamines.
Claims10
A semi-crystalline semi-aromatic polyamide comprising units derived from diamines (A-A units) comprising aliphatic diamine and from dicarboxylic acids (B-B units) comprising terephthalic acid, wherein:
- (a) the dicarboxylic acids consist of a mixture of aromatic dicarboxylic acid and aliphatic dicarboxylic acid, wherein
- (i) the aromatic dicarboxylic acid consists for at least 80 mole % of terephthalic acid, relative to the total amount of aromatic dicarboxylic acid, and
- (ii) the molar amount of the aliphatic dicarboxylic acid is at least 5 mole %, relative to the total amount of dicarboxylic acids, and the aliphatic dicarboxylic acid is chosen from the group consisting of adipic acid (C6), suberic acid (C8), sebacic acid (C10), dodecanoic acid (C12) and mixtures thereof,
- (b) the diamines consist of a mixture of long chain aliphatic diamine with 6-12 carbon atoms and short chain aliphatic diamine selected from the group consisting of 1,4 -butane diamine, 1,5 -pentanediamine and mixtures thereof, wherein the molar amount of the short chain aliphatic diamine is at least 10 mole %, relative to the total amount of diamines, and
- (c) the sum of the molar amount of the aromatic dicarboxylic acid and the long chain aliphatic diamine is 60-90 mole %, relative to the total molar amount of dicarboxylic acids and diamines.
Dependencies are inferred from the claim text.