High molecular weight polyester flame retardant and process for preparing the same
AssigneeIndustrial Technology Research Institute
InventorsShinn-Jen Chang, Yuung-Ching Sheen, Rong-Shuh Chang, Tsai-Wie Tseng, Jen-Lien Lin
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Abstract
The synthesis of a high-molecular weight phosphorus-containing polyester flame retardant is disclosed. A metal complex is selected as the catalyst to catalyze the addition reaction of phosphorus compounds and unsaturated dicarboxylic acids in the presence of saturated dicarboxylic acids and diols at a relatively lower temperture in one single reactor to form phosphorus-containing diacids, followed by esterification and polymerization to complete the process.
Claims14
A process for preparing a high-molecular weight flame retardant polyester having the formula:
- ##STR5## wherein R'.sub.1 is a C.sub.2 -C.sub.10 alkylene group or an aromatic group;
- R".sub.1 is a C.sub.2 -C.sub.10 alkylene group or an aromatic group;
- R.sub.2 is a C.sub.2 -C.sub.2 alkylene group or an aromatic group;
- R' is a C.sub.2 -C.sub.12 alkylene group or an aromatic group;
- A is R or OR, where R is a C.sub.1 -C.sub.12 alkyl group or an aromatic group;
- m is an integer from 1 to 10;
- and n is an integer from 1 to 10;
- comprising the following steps;
- (a) feeding in a single batch or in two batches a metal complex serving as catalyst, an unsaturated dicarboxylic acid or a derivative thereof, a saturated dicarboxylic acid or a derivative thereof, a diol, and a phosphorus compound having the formula:
- ##STR6## in a single reactor, and reacting at a temperature of 80.degree.-120.degree. C. to form a phosphorus-containing diacid;
- (b) raising the temperature of the reactor to 170.degree.-270.degree. C. to initiate an esterification reaction;
- and thereafter
- (c) polymerizing at a temperature of 245.degree.-285.degree. C. and a pressure less than 1.5 mmHg to obtain the high molecular weight flame retardant polyester.
A high molecular weight flame retardant polyester having the formula:
- ##STR7## wherein R'.sub.1 is a C.sub.2 -C.sub.10 alkylene group or an aromatic group;
- R".sub.1 is a C.sub.2 -C.sub.10 alkylene group or an aromatic group;
- R.sub.2 is a C.sub.2 -C.sub.12 alkylene group or an aromatic group;
- R' is a C.sub.2 -C.sub.12 alkylene or an aromatic group;
- A is R or OR, where R is a C.sub.1 -C.sub.12 alkyl group or an aromatic group;
- m is an integer from 1 to 10;
- and n is an integer from 1 to 10.
Dependencies are inferred from the claim text.