A polycarbonate, a preparation method thereof, and an application thereof are provided. First, an ureido-pyrimidinone type diisocyanate is prepared by a first compound and a second compound. Then, a third compound and the ureido-pyrimidinone type diisocyanate are reacted to obtain a polycarbonate. The polycarbonate replaces scratch resistant metal material to avoid the disadvantages of the signal shielding, heavy weight, and static electricity when using the scratch resistant metal material in the winter. The body housing is made of polycarbonate can have a self-healing property and a good heat resistance, so the internal components can be well protected.

A polycarbonate, a preparation method thereof, and an application thereof are provided. First, an ureido-pyrimidinone type diisocyanate is prepared by a first compound and a second compound. Then, a third compound and the ureido-pyrimidinone type diisocyanate are reacted to obtain a polycarbonate. The polycarbonate replaces scratch resistant metal material to avoid the disadvantages of the signal shielding, heavy weight, and static electricity when using the scratch resistant metal material in the winter. The body housing is made of polycarbonate can have a self-healing property and a good heat resistance, so the internal components can be well protected.

Provided are a photocurable resin composition that can be suitably used for an optical three-dimensional shaping method, and a cured product obtained by photocuring the composition and a three-dimensional shaped object including the cured product. The photocurable resin composition contains a compound represented by the formula (1) and a compound containing two or more epoxy groups.

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Provided is an aliphatic polycarbonate macropolyol including OAO and Z(O).sub.a as repeating units. In the aliphatic polycarbonate macropolyol, the repeating units OAO and Z(O).sub.a are linked to each other via carbonyl (C(O)) linkers or are bonded to hydrogen to form terminal OH groups. The number of moles of the terminal OH groups is from aZ to aZ+0.2Z (where Z represents the number of moles of the repeating unit Z(O).sub.a). Further provided is an aliphatic polycarbonate-co-aromatic polyester macropolyol including OAO and Z(O).sub.a as repeating units. In the aliphatic polycarbonate-co-aromatic polyester macropolyol, the repeating units OAO and Z(O).sub.a are linked via carbonyl (C(O)) and C(O)YC(O) as linkers or are bonded to hydrogen to form terminal OH groups.

Provided is an aliphatic polycarbonate macropolyol including OAO and Z(O).sub.a as repeating units. In the aliphatic polycarbonate macropolyol, the repeating units OAO and Z(O).sub.a are linked to each other via carbonyl (C(O)) linkers or are bonded to hydrogen to form terminal OH groups. The number of moles of the terminal OH groups is from aZ to aZ+0.2Z (where Z represents the number of moles of the repeating unit Z(O).sub.a). Further provided is an aliphatic polycarbonate-co-aromatic polyester macropolyol including OAO and Z(O).sub.a as repeating units. In the aliphatic polycarbonate-co-aromatic polyester macropolyol, the repeating units OAO and Z(O).sub.a are linked via carbonyl (C(O)) and C(O)YC(O) as linkers or are bonded to hydrogen to form terminal OH groups.

A branched polycarbonate comprising: high heat aromatic carbonate units derived from a high heat aromatic dihydroxy monomer units; optionally, low heat carbonate units derived from low heat monomer units; and 0.05-1.5 mole percent, preferably 0.05-1.0 mole percent, of a branching agent based on the total number of moles in the branched polycarbonate; wherein the branched polycarbonate has a tensile stress at break of 10-70 megaPascals measured according to ISO 527, and a glass transition temperature of 170-260 C. measured by differential scanning calorimetry according to ASTM D3418 with a 20 C./min heating rate.

A branched polycarbonate comprising: high heat aromatic carbonate units derived from a high heat aromatic dihydroxy monomer units; optionally, low heat carbonate units derived from low heat monomer units; and 0.05-1.5 mole percent, preferably 0.05-1.0 mole percent, of a branching agent based on the total number of moles in the branched polycarbonate; wherein the branched polycarbonate has a tensile stress at break of 10-70 megaPascals measured according to ISO 527, and a glass transition temperature of 170-260 C. measured by differential scanning calorimetry according to ASTM D3418 with a 20 C./min heating rate.

The present invention provides a thermally decomposable binder that achieves a reduced residual carbon after sintering, and that can be subjected to a dewaxing treatment at a relatively low temperature in a non-oxidative atmosphere. More specifically, the present invention provides an aliphatic polycarbonate that has a structure obtained by neutralizing a Brnsted acid with an organic onium salt in a side chain.

Disclosed is a polyol composition comprising: (a) at least one monomeric polyol comprising three or more hydroxyl groups; (b) at least one higher polyol comprising three or more hydroxyl groups; and (c) at least one polyhydroxylated aromatic compound; wherein the at least one higher polyol comprises residues of either or both of the at least one monomeric polyol and the polyhydroxylated aromatic compound linked by one or more carbonate groups, oxygen ether groups, or a combination thereof, and wherein the polyol composition has a viscosity of less than 5000 cps at 150 degrees Fahrenheit. The at least one monomeric polyol and at least one higher polyol may have any structures affording polyol compositions and polyurethane compositions having the requisite physical characteristics in terms of polyol composition viscosity and polyurethane heat resistance, strength and flexural modulus. The polyol compositions are adapted to provide structurally robust, temperature resistant polyurethanes, but are of sufficiently low viscosity to permit the use of currently available pumping and mixing equipment. The resultant polyurethane compositions may exhibit heat distortion temperatures in excess of 110 degrees centigrade, high strength and essentially no loss of material properties in prolonged humidity tests at 70 degrees centigrade, lower peak exotherms, typically less than 250 degrees Fahrenheit during in-mold curing/polymerization. Articles prepared from polyurethanes incorporating such polyol compositions as reactants exhibit flexural strengths in excess of 10,000 psi and flexural moduli in excess of 400,000 psi, and exhibit outstanding green strength.

Disclosed is a polyol composition comprising: (a) at least one monomeric polyol comprising three or more hydroxyl groups; (b) at least one higher polyol comprising three or more hydroxyl groups; and (c) at least one polyhydroxylated aromatic compound; wherein the at least one higher polyol comprises residues of either or both of the at least one monomeric polyol and the polyhydroxylated aromatic compound linked by one or more carbonate groups, oxygen ether groups, or a combination thereof, and wherein the polyol composition has a viscosity of less than 5000 cps at 150 degrees Fahrenheit. The at least one monomeric polyol and at least one higher polyol may have any structures affording polyol compositions and polyurethane compositions having the requisite physical characteristics in terms of polyol composition viscosity and polyurethane heat resistance, strength and flexural modulus. The polyol compositions are adapted to provide structurally robust, temperature resistant polyurethanes, but are of sufficiently low viscosity to permit the use of currently available pumping and mixing equipment. The resultant polyurethane compositions may exhibit heat distortion temperatures in excess of 110 degrees centigrade, high strength and essentially no loss of material properties in prolonged humidity tests at 70 degrees centigrade, lower peak exotherms, typically less than 250 degrees Fahrenheit during in-mold curing/polymerization. Articles prepared from polyurethanes incorporating such polyol compositions as reactants exhibit flexural strengths in excess of 10,000 psi and flexural moduli in excess of 400,000 psi, and exhibit outstanding green strength.