Polyester containing 2-methyl-1,3-propylene terephthalate units
AssigneeDaicel Chemical Industries, Ltd.
InventorsYuzo Toga, Toshio Shimada, Hajime Komada
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Abstract
Polytetramethyleneterephthalate is modified with incorporation of 2-methyl-1,3-propanediol. The diol component of the polyester comprises 1 to 99 mol % of tetramethylene glycol and 99 to 1 mol % of 2-methyl-1,3-propanediol. Alternatively polytetramethylene terephthalate is combined with 0.1 to 25 wt. %, based thereon, of poly-2-methyl-1,3-propylene terephthalate.
Claims9
A polyester resin containing terephthalic acid units, 1,4-butanediol units and 2-methyl-1,3-propanediol units, said polyester resin containing from 0.1 percent by weight of said 2-methyl-1,3-propanediol units polymerized with said terephthalic acid units, based on the total weight of said polyester resin, up to 99 mol percent of said 2-methyl-1,3-propanediol units polymerized with said terephthalic acid units, based on the total weight of the diol units.
A polyester copolymer comprising terephthalic acid copolymerized with a diol component comprising 1 to 99 mol% of tetramethylene glycol and 99 to 1 mol % of 2-methyl-1,3-propanediol.
A polyester copolymer which consists essentially of
- (A) 0.1 to 25 percent by weight of first repeating units of the formula ##STR2## (B) the balance is second repeating units of the formula ##STR3## and
A polyester resin composition which comprises a blend of a first resin which consists essentially of polytetramethylene terephthalate and a second resin which consists essentially of a member selected from the group consisting of (a) poly-2-methyl-1,3-propylene terephthalate resin, (b) a copolyester obtained by copolymerizing terephthalic acid with 2-methyl-1,3-propanediol and tetramethylene glycol, and (c) mixtures of (a) and (b), said blend containing from 0.1 to 25 percent by weight, of 2-methyl-1,3-propylene terephthalate units.
Dependencies are inferred from the claim text.