Method for preparing modified acrylonitrile-butadiene-styrene resin, and modified acrylonitrile-butadiene-styrene resin prepared thereby

Patent metadata

Field	Value
Publication number	US-10174193-B2
Application number	US-201615508472-A
Country	US
Kind code	B2
Filing date	Jun 17, 2016
Priority date	Jun 19, 2015
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

The present invention relates to method for preparing a modified acrylonitrile-butadiene-styrene resin having excellent matteness, impact resistance, and heat resistance, as well as having a low total volatile organic compounds content, and to a modified acrylonitrile-butadiene-styrene resin prepared thereby.

First claim

The invention claimed is:

1. A method for preparing a modified acrylonitrile-butadiene-styrene resin, the method comprising:
1) a step for preparing a polymerization solution by introducing and thereby dissolving a rubbery polymer and an N-sumstituted maleimide compound into a mixed solution that includes a reaction solvent, an aromatic vinyl monomer, and an ethylenically unsaturated nitrile monomer;
2) a step for preparing a polymerization product by polymerizing the polymerization solution; and
3) a step for devolatilizing the polymerization product, wherein the rubbery polymer includes a butadiene rubber and a styrene-butadiene rubber,
wherein the polymerization solution includes 10 to 30 wt % of the reaction solvent, 35.5 to 70.5 wt % of the aromatic vinyl monomer, 12 to 15 wt % of the ethylenically unsaturated nitrile monomer, 5 to 15 wt % of the rubbery polymer, and 2.5 to 6 wt % of the N-substituted maleimide compound.

2. The method of claim 1 , wherein the rubbery polymer in step 1) includes the butadiene rubber and the styrene-butadiene rubber in a weight ratio of 3:7 to 5:5.

3. The method of claim 1 , wherein the rubbery polymer has a viscosity of at most 50 cp as measured by a Brookfield DV viscometer with a #3 spindle moving at 10 rotations per minute through a solution in which the rubbery polymer is dissolved at a 5% concentration in styrene.

4. The method of claim 1 , wherein the polymerization reaction in step 2) is carried out via continuous bulk polymerization including at least one polymerization step.

5. The method of claim 1 , wherein:
the polymerization reaction in step 2) is carried out via continuous bulk polymerization including a first polymerization step, a second polymerization step, a third polymerization step, and a fourth polymerization step; and
the polymerization temperature increases going from the first polymerization step to the fourth polymerization step.

6. The method of claim 5 , wherein the first polymerization step is continuous bulk polymerization carried out at a temperature range of 100 to 120° C. for 1.5 to 2.5 hours.

7. The method of claim 5 , wherein the second polymerization step is continuous bulk polymerization carried out at a temperature range of 125 to 140° C.

8. The method of claim 5 , wherein the third polymerization step is continuous bulk polymerization carried out at a temperature range of 140 to 150° C.

9. The method of claim 5 , wherein the fourth polymerization step is continuous bulk polymerization carried out at a temperature range of 150 to 160° C.

10. The method of claim 5 , wherein, in the second polymerization step, a supplemental solution including, with respect to 100 parts by weight of the polymerization solution, 10 to 25 parts by weight of a reaction solvent and 0.02 to 0.04 parts by weight of a molecular weight control agent is added and thereby made to participate in the polymerization reaction.

11. The method of claim 5 , wherein after the first polymerization step, the weight-average molecular weight (Mw) of a continuous phase is 250,000 to 300,000 g/mol, the continuous phase being a copolymer of the aromatic vinyl monomer, the ethylenically unsaturated nitrile monomer, and the substituted maleimide compound.

12. The method of claim 1 , wherein the devolatilization in step 3) is carried out at a temperature range of 230 to 250° C. and under a pressure condition of 30 torr or below.

13. A modified acrylonitrile-butadiene-styrene resin prepared according to the preparation method in claim 1 , the modified acrylonitrile-butadiene-styrene resin comprising:
a dispersed phase, which is a rubber particle derived from a rubbery polymer including a butadiene rubber and a styrene-butadiene rubber; and
a continuous phase, which is a terpolymer derived from an aromatic vinyl monomer, an ethylenically unsaturated nitrile monomer, and an N substituted maleimide compound, wherein the weight-average molecular weight (Mw) of the continuous phase is 150,000 to 180,000 g/mol.

14. The modified acrylonitrile-butadiene-styrene resin of claim 13 , wherein the weight ratio between the dispersed phase and the continuous phase is 8:92 to 25:75.

15. The modified acrylonitrile-butadiene-styrene resin of claim 13 , wherein the average particle diameter of the dispersed phase is 1.0 to 2.0 μm.

16. The modified acrylonitrile-butadiene-styrene resin of claim 13 , wherein at least a portion of the continuous phase is grafted or adsorbed on the external surface of the dispersed phase.

17. The modified acrylonitrile-butadiene-styrene resin of claim 13 , wherein the continuous phase includes 5 to 10 wt % of an N substituted maleimide compound-derived unit.

18. The modified acrylonitrile-butadiene-styrene resin of claim 13 , wherein the resin has a total volatile organic compounds (TVOC) content of 40 μg C/g or less.

Assignees

• Lg Chemical Ltd

Inventors

• Seo Jae Bum
• Han Chang Hun
• Lee Dae Woo
• Park Jung Tae
• Choi Eun Jung
• Kang Byoung Il
• Sung Da Eun
• Kim Gyu Sun

Classifications

• C08L2201/02

  Flame or fire retardant/resistant · CPC title

• C08L55/02 Primary

  ABS [Acrylonitrile-Butadiene-Styrene] polymers · CPC title

• C08L25/10

  with conjugated dienes · CPC title

• C08F279/02

  on to polymers of conjugated dienes · CPC title

• C08F2/06

  Organic solvent · CPC title