Semi-Crystalline Semi-Aromatic Polyamide
AssigneeDsm IP Assets B.V.
InventorRudy Rulkens
Life of this patent
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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
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, characterised in that
- 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,
- b. the diamines consist of a mixture of long chain aliphatic diamine and short chain aliphatic diamine, 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.