3644-98-2

Usage

Chemical compound

1,4-Benzenedicarboxylic acid, bis(3-hydroxypropyl) ester

Usage

plasticizer in the production of polyvinyl chloride (PVC) and other polymers

Physical state

clear, colorless liquid

Solubility

insoluble in water, soluble in most organic solvents

Applications

manufacturing of flexible plastic products such as upholstery, shower curtains, and electrical insulation

Health and environmental concerns

identified as a potential endocrine disruptor

Ongoing efforts

finding alternative chemicals for use in plastic manufacturing

Upstream product

• 504-63-2 trimethyleneglycol 
• 120-61-6 1,4-benzenedicarboxylic acid dimethyl ester 

Downstream Products

• 120-61-6 1,4-benzenedicarboxylic acid dimethyl ester 

Relevant academic research and scientific papers

METHODS OF DEPOLYMERIZING TEREPHTHALATE POLYESTERS

A method comprises forming a reaction mixture comprising a terephthalate polyester, a glycol comprising 2 to 5 carbons, and an amidine organocatalyst; and heating the reaction mixture at a temperature of about 120° C. or more to depolymerize the terephthalate polyester, thereby forming a terephthalate reaction product comprising a monomeric dihydroxy terephthalate diester; wherein the terephthalate reaction product contains terephthalate oligomers in an amount less than the amount of terephthalate oligomers that would result from i) substituting the amidine organocatalyst with an equimolar amount of a guanidine catalyst and ii) depolymerizing the terephthalate polyester under otherwise identical reaction conditions.

Ester-forming monomer

An ester-forming monomer obtained by depolymerization of polytrimethylene terephthalate and having an acrolein content of no greater than 0.5 wt %. Polymers obtained using the monomer and fibers, films and molded articles comprising the polymers. The ester-forming monomer is obtained by reacting polytrimethylene terephthalate with at least one compound selected from among monoalcohols, 1,3-propanediol and water in the presence of a basic substance. When the recovered ester-forming monomer is used as the starting material for production of a polymer, it is possible to produce a molding polymer for fibers, films and the like with quality equivalent to or higher than that obtained using virgin monomer.

Transesterification process using yttrium and samarium compound catalystis

This invention relates to an improvement for the preparation of bis(3-hydroxypropyl) dicarboxylate monomers using 1,3-propanediol and a dialkyl dicarboxylate in the presence of a catalytic amount of such yttrium and/or samarium compounds as yttrium/samarium acetylacetonate or tris(2,2,6,6-tetramethyl-3,5-heptanedionato) yttrium/samarium which act as a catalyst for the transesterification reaction

Transesterification process using lanthanum compound catalyst

This invention relates to an improved transesterification process for the preparation of bis(3-hydroxypropyl) terephthalate monomer from 1,3-propanediol and a dialkyl terephthalate using a lanthanum compound transesterification catalyst.