| abstract |
PROBLEM TO BE SOLVED: To solve various problems of a flame-retardant polyester adhesive, and to provide a polyester for a flame-retardant hot melt adhesive which has particularly excellent moisture-heat resistance and metal adhesion, and has a low environmental load. provide. SOLUTION: This is a crystalline copolyester containing a dicarboxylic acid component and 1,4-butanediol as main components. The dicarboxylic acid component is composed of 30 to 98.5 mol% of terephthalic acid, 0.5 to 25 mol% of dimer acid, 1 to 30 mol% of isophthalic acid and / or aliphatic dicarboxylic acid, based on all acid components constituting the polyester, Contains an organic phosphorus compound having two or more forming functional groups in an amount such that the phosphorus atom content in the polyester is 500 to 50,000 ppm, And the melting point is 50-200 ° C. |