Heat-resistant SAN resin, method for manufacturing same, and heat-resistant ABS resin composition comprising same
Disclosed are a heat-resistant SAN resin, a method of preparing the same, and a heat-resistant ABS resin composition comprising the same. More particularly, a heat-resistant SAN resin comprising 60 to 75 wt % of α-methylstyrene, 25 to 35 wt % of a vinyl cyan compound, and 0 to 10 wt % of an aromatic vinyl compound (except for α-methylstyrene), the heat-resistant SAN resin having a degree of branching of 0.40 to 0.60, a molecular weight of 90,000 to 150,000 g/mol, and a glass transition temperature (Tg) of 124 to 140° C., a method of preparing the same, and a heat-resistant ABS resin composition comprising the same are disclosed.
1. A method of preparing a heat-resistant styrene-acrylonitrile (SAN) resin, the method comprising:
polymerizing by adding 0.05 to 0.5 parts by weight of a multifunctional initiator to 100 parts by weight of a monomer mixture comprising 60 to 75 wt % of α-methylstyrene, 25 to 35 wt % of a vinyl cyan compound, and 0 to 10 wt % of an aromatic vinyl compound other than α-methylstyrene, and
removing by volatilizing unreacted monomers and a solvent under a pressure of 25 torr or less after the polymerization.
2. The method according to claim 1 , wherein the multifunctional initiator comprises 2 to 4 functional groups.
3. The method according to claim 2 , wherein the functional groups are peroxide groups.
4. The method according to claim 2 , wherein the multifunctional initiator is 2,2-bis(4,4-di-t-butylperoxy cyclohexyl) propane, 1,1-bis(t-butylperoxy) cyclohexane, and a mixture thereof.
5. The method according to claim 1 , wherein the polymerization is performed at 95 to 105° C.
6. The method according to claim 1 , wherein the polymerization is performed for 6 to 8 hours.
7. The method according to claim 1 , wherein the polymerization is continuous bulk polymerization.
8. The method according to claim 1 , wherein the removing is performed at 200 to 250° C.
9. A heat-resistant acrylonitrile butadiene styrene (ABS) resin composition comprising:
an ABS resin; and
a heat-resistant styrene-acrylonitrile (SAN) resin,
wherein the heat-resistant SAN resin has a degree of branching of 0.40 to 0.60, a molecular weight of 90,000 to 150,000 g/mol, and a glass transition temperature (Tg) of 124 to 140° C.,
wherein the heat-resistant SAN resin comprises 60 to 75 wt % of α-methylstyrene, 25 to 35 wt % of a vinyl cyan compound, and 0 to 10 wt % of an aromatic vinyl compound other than α-methylstyrene, and
wherein the heat-resistant SAN resin comprises 0.1 to 0.8 wt % of an oligomer.
10. The heat-resistant ABS resin composition according to claim 9 , wherein the heat-resistant ABS resin composition comprises 10 to 40 wt % of an ABS resin and 60 to 90 wt % of the heat-resistant SAN resin.
11. The heat-resistant ABS resin composition according to claim 9 , wherein the heat-resistant ABS resin composition comprises a hindered phenolic antioxidant, a phosphorous antioxidant, or a mixture thereof.
12. A heat-resistant ABS resin composition comprising:
an acrylonitrile butadiene styrene (ABS) resin; and
a heat-resistant styrene-acrylonitrile (SAN) resin,
wherein the heat-resistant SAN resin has a degree of branching of 0.40 to 0.60, a molecular weight of 90,000 to 150,000 g/mol, and a glass transition temperature (Tg) of 124 to 140° C.,
wherein the heat-resistant SAN resin comprises 60 to 75 wt % of α-methylstyrene, 25 to 35 wt % of a vinyl cyan compound, and 0 to 10 wt % of an aromatic vinyl compound other than α-methylstyrene, and
wherein the heat-resistant ABS resin composition comprises 10 to 40 wt % of an ABS resin and 60 to 90 wt % of the heat-resistant SAN resin.