초록 ▼

A polyester resin is disclosed which is resistant to splitting during transverse orientation during conventional film manufacturing. The polyester resin contains up to 7 weight percent, based uon the total weight of the resin, of (A) a dicarboxylic acid component consisting essentially of 1,4-cycloh

A polyester resin is disclosed which is resistant to splitting during transverse orientation during conventional film manufacturing. The polyester resin contains up to 7 weight percent, based uon the total weight of the resin, of (A) a dicarboxylic acid component consisting essentially of 1,4-cyclohexandeicarboxylic acid having a trans isomer content of at least 70% (B) a glycol component consisting essentially of (1) 1,4-cyclohexanedimethanol, and (2) from about 15 to about 50 weight percent, based on the weight of the polyesterether, of polytetramethyleneether glycol having a molecular weight of about 500 to about 1100 and (c) from about 0.1 to about 1.5 mole percent, based on the mole percentage of the acid or glycol component, of a branching agent having at least three COOH or OH functional groups and from 3 to 60 carbon atoms.

대표청구항 ▼

A polyester resin containing a copolyesterether comprising: (A) a dicarboxylic acid component consisting essentially of 1,4-cyclohexanedicarboxylic acid having a trans isomer content of at least 70%, (B) a glycol component consisting essentially of (1) 1,4-cyclohexanedimethanol, and (2) from about 1

A polyester resin containing a copolyesterether comprising: (A) a dicarboxylic acid component consisting essentially of 1,4-cyclohexanedicarboxylic acid having a trans isomer content of at least 70%, (B) a glycol component consisting essentially of (1) 1,4-cyclohexanedimethanol, and (2) from about 15 to about 5weight percent, based on the weight of the polyesterether, of polytetramethyleneether glycol having a molecular weight of about 500 to about 1100 and (C) from about 0.1 to about 1.5 mole percent, based on the mole percentage of the acid or glycol component, of a branching agent having at least three carboxyl or hydroxyl functional groups and from 3 to 60 carbon atoms, said copolyesterether being present in said polyester resin in an amount effective to reduce the occurrence of film splitting during the production of biaxially oriented film from said resin but not exceeding 7 weight percent, based upon the total weight of the polyester resin and the copolyesterether.