Copolyester composition
AssigneeShell Oil Company
InventorDonald Ross Kelsey
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Abstract
According to the invention, an amorphous copolyester is prepared by contacting, under polymerization conditions an aromatic dicarboxylic acid or ester or anhydride thereof, a 2,2,4,4-tetraalkyl-1,3-cyclobutanediol and 1,3-propanediol or 1,4-butanediol. The resulting copolyester exhibits superior thermal and impact properties.
Claims12
An amorphous polymeric composition having an intrinsic viscosity of at least about 0.5 a notched Izod greater than 3 ft-lb/in and a glass transition temperature greater than 100.degree. C. which composition is the product of contacting monomers comprising (a) at least one aromatic dicarboxylic acid or an alkyl ester or anhydride thereof;
- (b) about 40 to about 90 mole percent based on moles of components (b) and (c) of at least one 2,2,4,4-tetraalkyl-1,3-cyclobutanediol having a cis:trans ratio within the range of about 33:67 to about 67:33;
- and (c) at least one of 1,3-propanediol and 1,4-butanediol, under polycondensation reaction conditions in the presence of a polycondensation reaction conditions in the presence of a polycondensation catalyst.
An amorphous copolyester composition having randomly-distributed units of the structural formulas ##STR2## in which the ratio of the number of units of I to the number of units of II is within the range of about 40:60 to about 90:10 and R is 1,3-trimethylene or 1,4-tetramethylene, said composition having a notched Izod greater than 3 ft-lb/in and a glass transition temperature greater than 100.degree. C.
Dependencies are inferred from the claim text.