Polarizing beam splitter
A polarizing beam splitter, thin film technology, applied in the field of projection systems, can solve problems such as insufficient angle performance
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example 1
[0107] This example describes the synthesis of a copolymer, designated for convenience as coPET-A, for use as a low refractive index layer in a multilayer film. The components listed in Table 2 were added to a batch of reactors. Under a pressure of 0.20 MPa, the mixture was heated to 254°C to remove methanol. After 45.5 kg of methanol was removed, 52 g of triethyl phosphonate was added to the reactor, and then the pressure was gradually reduced to 133 Pa while the temperature was heated to 285 °C
[0108] The by-product of the condensation reaction, ethylene glycol, was continuously removed until the polymer had an intrinsic viscosity of 0.84 dL / g when measured as 60 / 40 wt.% phenol / o-dichlorobenzene. The chemical structure below is a description of coPET-A.
[0109]
example 2
[0111] This example describes the synthesis of a copolymer, labeled coPET-C for convenience, which is used as a low refractive index layer in a multilayer film. The components listed in Table 2 were added to a batch of reactors. Under a pressure of 0.20 MPa, the mixture was heated to 254°C to remove methanol. After 4.1 kg of methanol was removed, 52 g of triethyl phosphonate was added to the reactor, and then the pressure was gradually reduced to 133 Pa while the temperature was heated to 285 °C.
[0112] The by-product of the condensation reaction, ethylene glycol, was continuously removed until the polymer had an intrinsic viscosity of 0.82 dL / g when measured as 60 / 40 wt.% phenol / o-dichlorobenzene.
example 3
[0114] This example describes the synthesis of a copolymer, designated for convenience as coPET-D, for use as a low refractive index layer in a multilayer film. The components listed in Table 2 were added to a batch of reactors. Under a pressure of 0.20 MPa, the mixture was heated to 254°C to remove methanol. After 35.4 kg of methanol was removed, 57 g of triethyl phosphonate was added to the reactor, and then the pressure was gradually reduced to 133 Pa while the temperature was heated to 285 °C.
[0115] The by-product of the condensation reaction, ethylene glycol, was continuously removed until the polymer had an intrinsic viscosity of 0.82 dL / g when measured as 60 / 40 wt.% phenol / o-dichlorobenzene.
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