Disclosed herein are embodiments of a method for making recyclable polymers and a method for decomposing the polymers back to the monomers which can then be reused. The polymer are stable to aqueous and/or acid conditions and may have a formula II

##STR00001##

The method to decompose the polymer back to the monomers may comprise heating the polymer in a protic organic solvent.

Described herein are methods of preparing poly(alkylene carbonate) polymers comprising an increased ratio of primary hydroxyl end groups to secondary hydroxyl end groups, and compositions thereof.

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.

The present invention relates to a method for producing a mixture comprising at least one compound having at least two hydroxy and/or amino groups made of a biomass material. The invention also relates to such a mixture and to the use thereof for producing a polymer such as for example a polyurethane foam.

The present invention provides a thermal insulation composition and a preparation method and application. The thermal insulation composition is composed of aerogel material and organic resin; the composite mass ratio of the aerogel material to the organic resin is 5 wt %:95 wt % to 50 wt %:50 wt %; the porosity of the aerogel material is greater than 95%, the pore diameter of the aerogel material is less than or equal to 100 nm, the particle size of each particle of aerogel material is 5 nm to 20 nm, and the organic resin is filled in the pores of the aerogel material. The thermal insulation module component prepared from the thermal insulation composition has mechanical strength and thermal conductivity at room temperature, and if the battery goes into thermal runaway, the material becomes a heat-insulating material, blocking the heat transfer between battery cells, greatly improving the safety performance of the battery.

The present disclosure relates to a composition for a radar transmissive cover for a vehicle, which may enhance dielectric properties while excellently maintaining mechanical properties. The composition, as the composition forming the radar transmissive cover for the vehicle through which a radar beam radiated from a radar is transmitted, has a main material in which 70 to 90 wt % of Polybutylene Terephthalate (PBT) and 10 to 30 wt % of Polycarbonate (PC) are mixed and an additive containing at least reinforcing filler mixed.

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).

A resin composition containing an organic resin (i) containing carboxylic acid ester and/or ether functional groups and optionally other halo groups, amino groups, hydroxyl groups, carboxylic acid groups and cyano groups and a moisture-curable silylated polycarbonate resin (ii) derived from a copolycarbonate diol, prepared from diol(s) having even numbers of carbon atoms and odd number of carbon atoms and coatings formulated using these resin compositions.

The present disclosure discloses a photosensitive resin composition and a use the same. The resin composition of the present disclosure includes 40-70 parts by weight of an alkali-soluble resin, 20-50 parts by weight of a photopolymerizable monomer, 0.5-10.0 parts by weight of a photoinitiator, and 0.1-10.0 parts by weight of additives. The photopolymerizable monomer includes 0.5-15.0 parts by weight of a monomer containing carbonate structure. The photosensitive resin composition is used as a dry film resist. It has characteristics such as easy breakage of film strip, smaller film strip fragments, faster film strip speed, excellent flexibility, and good circuit resolution and adhesion, thereby effectively improving production efficiency and product yield.

A polycarbonate resin composition or a copolymer, comprising, as main repeating units, a carbonate unit (a-1) having a fluorene ring in a side chain, a carbonate unit (a-2) represented by the following formula (a-2):

##STR00001##

(wherein W represents an alkylene group having 1 to 20 carbon atoms or a cycloalkylene group having 6 to 20 carbon atoms, R represents a branched or linear-chain alkyl group having 1 to 20 carbon atoms or a cycloalkyl group having 6 to 20 carbon atoms optionally having a substituent, and u represents an integer of 0 to 3), and a carbonate unit (a-3) derived from 2,2-bis(4-hydroxyphenyl)propane, wherein 1) a molar ratio of the carbonate unit (a-1) to the carbonate unit (a-2) is from 50/50 to 80/20, and 2) a molar ratio of the total of the carbonate unit (a-1) and the carbonate unit (a-2) to the carbonate unit (a-3) is from 1:99 to 70:30. This polycarbonate resin composition or copolymer has excellent heat resistance, transparency, and bending resistance and has low retardation.