Abstract Thermally stable fiber-forming polyester having improved dyeability with disperse dyes are produced from dicarboxylic acids, or reactive derivatives thereof, glycols and small amounts of mixtures of compounds having a typical general formula: R-O(GO)x-H where R is an alkyl group containing an average of from about eight to 20 carbon atoms; G is a hydrocarbon radical selected from the group consisting of ethylene, propylene and isomers thereof, butylene and isomers thereof, and mixtures of the above; and x has an average value of from 8-20, and is about equal to or greater than R. Polyfunctional chain-branching agents in amounts up to about 0.73 mole percent, based on the weight of the dicarboxylic acid or ester-forming derivative thereof, may be added, whereby the polymer, with the chain terminators described above, can be polymerized to higher molecular weights by ordinary polymerization techniques.
A new composition of matter as defined in claim 1 wherein the synthetic linear condensation polyester has at least 85 percent by weight of an ester of terephthalic acid and ethylene glycol, and is further modified with up to about 0.45 mole percent, based on the amount of terephthalic acid, of a tetra-functional chain-branching agent selected from the group consisting of (a) compounds having the formula R-(OH)4 wherein R is alkylene group containing from three to six carbon atoms; and (b) aromatic tetra-functional acids or their esters.
Claim 2
Dependent Claim
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The new composition of matter defined in claim 2 where the chain-branching agent is pentaerythritol.
Claim 3
Dependent Claim
112 words
A new composition of matter as defined in claim 1 wherein the synthetic linear condensation polyester is a polyester of terephthalic acid and ethylene glycol, and further modified with up to about 0.73 mole percent, based on the weight of the terephthalic acid, of a chain-branching agent selected from the group consisting of: (a) compounds having the formula R-(OH)3 wherein R is an alkylene group containing three to six carbon atoms; (b) compounds having the formula: R-(CH2OH)3 where R is an alkyl group containing from two to six carbon atoms (c) compounds having the formula: wherein n is an integer from 1 to 6, and (d) aromatic trifunctional acids or their esters.
Claim 4
Dependent Claim
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The new composition of matter defined in claim 4 wherein the chain-branching agent is trimesic acid.
Claim 5
Dependent Claim
31 words
The new composition of matter defined in claim 2 wherein the chain-branching agent is pentaerythriTol, in an amount of about 0.19 mole percent, based on the weight of the terephthalic acid.
Claim 6
Dependent Claim
31 words
The new composition of matter defined in claim 4 wherein the chain-branching agent is trimesic acid in an amount of about 0.49 mole percent based on the weight of terephthalic acid.
Claim 7
Dependent Claim
51 words
A new composition of matter as defined in claim 1 wherein the additive is present in from about 0.75 to 2.0 mole percent, based on each polyester repeating unit, R is an alkyl group containing an average of 12-16 carbon atoms, G is an ethylene radical, and x is about 14.