초록 ▼

A copolyester is formed of at least one symmetrical aromatic dicarboxylic acid member, at least one dimer acid, and at least one C2－C10 glycol, and at least one polyester polyol member. The polyester polyol member is either a polycaprolactone polyol having a molecular weight of 500-5,000, or a mixtu

A copolyester is formed of at least one symmetrical aromatic dicarboxylic acid member, at least one dimer acid, and at least one C2－C10 glycol, and at least one polyester polyol member. The polyester polyol member is either a polycaprolactone polyol having a molecular weight of 500-5,000, or a mixture of a polycaprolactone diol having a molecular weight of 300-5,000 and a nonpolymeric polyol. The resultant thermoplastic copolyester has a glass transition temperature of less than 25°C and a polymer melting temperature greater than 70°C, and is useful both as a hot melt adhesive by itself and as an ingredient of both pressure sensitive and non-pressure sensitive hot melt adhesive formulations. In producing the copolyester, an intermediate copolyester of the symmetrical aromatic dicarboxylic acid member, the dimer acid, and the glycol is chain extended by reaction with the polyester polyol member in a 2-6 hour reaction at about 225°-270°C under a vacuum of about 1-30 mm. Hg. pressure.

대표청구항 ▼

A thermoplastic copolyester, characterized by a glass transition temperature less than 25°C and a melting temperature greater than 70°C, of A. at least one aromatic dicarboxylic acid member selected from the group consisting of a symmetrical aromatic dicarboxylic acid and the acid-functioning deriva

A thermoplastic copolyester, characterized by a glass transition temperature less than 25°C and a melting temperature greater than 70°C, of A. at least one aromatic dicarboxylic acid member selected from the group consisting of a symmetrical aromatic dicarboxylic acid and the acid-functioning derivatives thereof, B. at least one dimer acid, C. at least one C2－C10 glycol, and D. at least one polyester polyol member selected from the group consisting of i. a polycaprolactone polyol having a molecular weight of from about 500 to about 5,000 and a functionality greater than 2, said polycaprolactone polyol being present in an amount from about 1 to about 6 mole percent of the total dicarboxylic acid members in said copolyester, and ii. a mixture of a polycaprolactone diol having a molecular weight of from about 300 to about 5,000, and a non-polymeric polyol having a functionality greater than 2, said polycaprolactone diol and said non-polymeric polyol each being present in said mixture in an amount from about 1 to about 6 mole percent of the total dicarboxylic acid members in said copolyester.