Polymers and formulated compositions are designed to have properties that allow their effective use in additive manufacturing processes, particularly for preparing articles wherein molten monofilament polymer is laid down on top of a previously deposited line of molten monofilament polymer.

Provided is a thermoplastic resin having a constituent unit represented by the following general formula (I):

##STR00001## wherein R.sup.1 represents a hydrocarbon group containing 1 to 6 carbon atoms, and R.sup.2 and R.sup.3 each independently represent a hydrogen atom or a methyl group.

Provided is a thermoplastic resin having a constituent unit represented by the following general formula (I):

##STR00001## wherein R.sup.1 represents a hydrocarbon group containing 1 to 6 carbon atoms, and R.sup.2 and R.sup.3 each independently represent a hydrogen atom or a methyl group.

Disclosed is a bio-based polycarbonate ester comprising: (i) repeat unit 1 obtained from a condensation reaction of 1,4:3,6 -dianhydrohexitol and carbonate; and (ii) repeat unit 2 obtained from a condensation reaction of 1,4:3,6-dianhydrohexitol and 1,4-cyclohexanedicarboxylate; and a preparation method for the bio-based polycarbonate ester, comprising the steps of: (1) preparing a compound 1,4-diphenyl-cyclohexanedicarboxylate through a trans-esterification or esterification reaction of a compound represented by formula 2 ##STR00001##
and phenol; and (2) preparing a compound comprising a repeat unit represented by formula 1 ##STR00002##
through a polycarbonate melt polycondensation reaction of the 1,4-diphenyl -cyclohexanedicarboxylate prepared in step (1), a compound represented by formula 4 ##STR00003##
and 1,4:3,6-dianhydrohexitol.

Disclosed is a bio-based polycarbonate ester comprising: (i) repeat unit 1 obtained from a condensation reaction of 1,4:3,6 -dianhydrohexitol and carbonate; and (ii) repeat unit 2 obtained from a condensation reaction of 1,4:3,6-dianhydrohexitol and 1,4-cyclohexanedicarboxylate; and a preparation method for the bio-based polycarbonate ester, comprising the steps of: (1) preparing a compound 1,4-diphenyl-cyclohexanedicarboxylate through a trans-esterification or esterification reaction of a compound represented by formula 2 ##STR00001##
and phenol; and (2) preparing a compound comprising a repeat unit represented by formula 1 ##STR00002##
through a polycarbonate melt polycondensation reaction of the 1,4-diphenyl -cyclohexanedicarboxylate prepared in step (1), a compound represented by formula 4 ##STR00003##
and 1,4:3,6-dianhydrohexitol.

A polyester carbonate resin is provided and includes a constituent unit represented by the following general formula (1), a constituent unit represented by the following general formula (2), and a constituent unit represented by the following general formula (3): ##STR00001##
wherein R represents hydrogen or an alkyl group containing 1 to 4 carbon atoms, ##STR00002##
wherein Q represents the following: ##STR00003##
wherein n and m each independently represent an integer of 0 to 5, and ##STR00004##

A polyester carbonate resin is provided and includes a constituent unit represented by the following general formula (1), a constituent unit represented by the following general formula (2), and a constituent unit represented by the following general formula (3): ##STR00001##
wherein R represents hydrogen or an alkyl group containing 1 to 4 carbon atoms, ##STR00002##
wherein Q represents the following: ##STR00003##
wherein n and m each independently represent an integer of 0 to 5, and ##STR00004##

The invention provides an optical lens that can provide small-sized imaging modules. The optical lens of the invention comprises a thermoplastic resin having a refractive index (nD) and Abbe number (ν) satisfying the following mathematical formula (A):

nD≤−0.02×ν+2.040  (A)

(where 1.660<nD).

Provided is a polyester carbonate resin having a constituent unit (I) represented by the following general formula (1), a constituent unit (II) represented by the following general formula (2), and a constituent unit (III) represented by the following general formula (3):

##STR00001## wherein, in the above formula (1), R.sup.1 to R.sup.3 each independently represent a hydrogen atom, a methyl group or an ethyl group, and in the above formula (2), Q represents a divalent linking group.

Provided is a polyester carbonate resin having a constituent unit (I) represented by the following general formula (1), a constituent unit (II) represented by the following general formula (2), and a constituent unit (III) represented by the following general formula (3):

##STR00001## wherein, in the above formula (1), R.sup.1 to R.sup.3 each independently represent a hydrogen atom, a methyl group or an ethyl group, and in the above formula (2), Q represents a divalent linking group.