BRANCHED, TERMINATED POLYAMIDE COMPOSITIONS
The present disclosure provides a method of producing partially terminated polyamide compositions with branched chains from polyamide precursors. The partially terminated, branched polyamide compositions have increased melt strength properties and melt stability.
1 - 6 . (canceled)
7 . A polyamide composition having the following formula:
wherein:
a=6 to 10;
b=6 to 10;
c=6 to 10;
d=6 to 10;
x=80 to 400;
m=1 to 400;
said polyamide includes dimer acids wherein carbon chains of the dimer acids both have more than 8 carbons;
the polyamide composition has a dimer diamine or dimer acid composition between 1 wt. % and 40 wt. % based on the total weight of the polyamide composition;
the polyamide composition is terminated with an amine endgroup and a carboxyl endgroup; and
the polyamide composition has a relative viscosity between 3.0 and 7.0 RV as determined by GB/T 12006.1-2009/ISO 307:2007.
8 . The polyamide composition of claim 7 , wherein the amine endgroup concentration is between 15 mmol/kg to 40 mmol/kg, and the carboxyl endgroup concentration is between 15 mmol/kg to 40 mmol/kg.
9 . The polyamide composition of claim 7 , wherein the polyamide composition has a relative viscosity of 4.0 RV to 7.0 RV as determined by GB/T 12006.1-2009/ISO 307:2007.
10 . The polyamide composition of claim 7 , wherein the polyamide composition has a formic acid viscosity of 230 FAV to 950 FAV, as determined by ASTM D789.
11 . The polyamide composition of claim 7 , wherein the polyamide composition has a formic acid viscosity of 230 FAV to 260 FAV, as determined by ASTM D789.
12 . A method of producing a branched, terminated polyamide composition, the method comprising:
reacting caprolactam and adipic acid or hexamethylene diamine in a reactor vessel to form a polyamide prepolymer;
reacting the polyamide prepolymer to a dimer amine or a dimer acid to form a branched, polyamide composition; and
adding terminators to the reactor vessel such that the branched, terminated polyamide composition is formed.
13 . The method of claim 12 , wherein the branched, terminated polyamide composition has an amine endgroup concentration of 15 mmol/kg to 40 mmol/kg, and has a carboxyl endgroup concentration of 15 mmol/kg to 40 mmol/kg.
14 . The method of claim 12 or 13 , wherein the branched, terminated polyamide composition has a relative viscosity of 2.4 RV to 7.0 RV as determined by GB/T 12006.1-2009/ISO 307:2007.
15 . The method of claim 12 , wherein the branched, terminated polyamide composition has a relative viscosity of 4.0 RV to 7.0 RV as determined by GB/T 12006.1-2009/ISO 307:2007.
16 . The method of claim 12 , wherein the branched, terminated polyamide composition has a formic acid viscosity of 230 FAV to 260 FAV, as determined by ASTM D789.
17 . The method of claim 12 , wherein the branched, terminated polyamide composition has a relative viscosity of 4.0 RV to 7.0 RV and a formic acid viscosity of 230 FAV to 260 FAV, as determined by ASTM D789.
18 . The method of claim 12 , wherein the ratio of caprolactam to dimer acid in the branched, terminated polyamide composition is 88:12.
19 . A polyamide composition that is dual-terminated with an amine end group and a carboxyl end group, the polyamide composition has a relative viscosity of 4.0 RV to 7.0 RV and a formic acid viscosity of 230 FAV to 970 FAV, as determined by ASTM D789.
20 . The polyamide composition of claim 19 , wherein the amine endgroup concentration is between 15 mmol/kg to 40 mmol/kg, and the carboxyl endgroup concentration is between 15 mmol/kg to 40 mmol/kg.