Halogen-containing polymer and production method for same
To provide a highly heat resistant flame retardant. A polymer having repeating units represented by the following formula (1), which has a weight average molecular weight as calculated as standard polystyrene of at least 6,000: wherein R is a C 1-6 alkylene group, —S— or —SO 2 —.
1. A method for producing a polymer having repeating units represented by the following formula (1)
wherein R is a C 1-6 alkylene group, —S— or —SO 2 —, which comprises reacting a compound represented by the following formula (2) and a compound represented by the following formula (3):
wherein R is a C 1-6 alkylene group, —S— or —SO 2 —, and X is a halogen atom;
wherein R is a C 1-6 alkylene group, —S— or —SO 2 —, and M is an alkali metal ion or a substituted or non-substituted ammonium ion;
wherein the polymer has a weight average molecular weight as calculated as standard polystyrene of at least 6,000.
2. The method of claim 1 , wherein the polymer has a weight average molecular weight as calculated as standard polystyrene of at least 7,500.
3. The method of claim 1 , wherein the content of a monomer represented by the following formula (2) is at most 3% in the entire polymer having repeating units represented by the formula (1), as measured by GPC:
wherein R is a C 1-6 alkylene group, —S— or —SO 2 —, and X is a halogen atom.
4. The method of claim 1 , wherein the polymer has a melting point of at least 255° C.
5. The method of claim 1 , wherein the 20 wt % weight loss temperature of the polymer is at least 365° C. at a temperature-raising rate of 10° C/min.