Copolymer, thermoplastic resin composition including copolymers and mould product including thermoplastic resin composition
A technology of copolymers and compositions, applied in the field of thermoplastic resin compositions, which can solve the problems of sudden degradation of heat resistance, degradation of impact strength and temperature resistance, low gloss effect, etc.
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[0042] According to one embodiment, at least one selected from styrene and α-methylstyrene may be used as the aromatic vinyl-based monomer.
[0043] In the present invention, the aromatic vinyl-based monomer may be present in an amount of 50% by weight (wt%) to 80wt% based on the total weight of the monomer mixture that is copolymerized to prepare the copolymer. When the content of the aromatic vinyl-based monomer is within this content range, the impact strength and heat resistance of the thermoplastic resin composition may be improved. For example, the aromatic vinyl-based monomer may be included in a content of 55 wt % to 78 wt %. By way of another example, the aromatic vinyl-based monomer may be present in an amount ranging from 60 wt% to 78 wt%. According to one embodiment, the aromatic vinyl monomer may be present in an amount of 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79 or 80 wt%.
[0044] (...
Embodiment 1
[0095] Based on the monomer mixture including ingredients and their contents as listed in Table 1 below, 0.2 parts by weight of tert-dodecylmercaptan (TDM) and 0.2 parts by weight of azobisisobutyronitrile (AIBN) were put into reactor, followed by suspension polymerization to produce copolymers. The copolymer was washed with water, dehydrated, and then dried at 80°C for 48 hours. Thereafter, using a twin-screw extruder equipped with a T-die (T-die), the copolymer was extruded at a barrel temperature of 250° C. to prepare test samples in the form of sheets with a thickness of 1 mm for evaluation of physical properties. Sample. The prepared copolymer had a weight average molecular weight of 160,000 g / mol, and a glass transition temperature of 104.4°C.
Embodiment 2
[0097] A copolymer was prepared in the same manner as in Example 1, except that the ingredients and their contents as listed in Table 1 below were used. The prepared copolymer had a weight average molecular weight of 150,000 g / mol, and a glass transition temperature of 102.1°C.
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