Thermoplastic resin composition and molded product manufactured therefrom

Patent metadata

Field	Value
Publication number	US-11518874-B2
Application number	US-201816628060-A
Country	US
Kind code	B2
Filing date	Jun 14, 2018
Priority date	Jul 14, 2017
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

A thermoplastic resin composition of the present invention is characterized by comprising: a thermoplastic resin containing a rubber-modified vinyl-based graft copolymer and an aromatic vinyl-based copolymer resin; zinc oxide; zinc phosphate; a surface-coated zinc oxide, of which a portion or the entirety of a surface is coated with zinc phosphate. The thermoplastic resin composition has excellent acid resistance and antibacterial properties.

First claim

The invention claimed is:

1. A thermoplastic resin composition comprising:
(A) a thermoplastic resin comprising (A1) a rubber-modified vinyl graft copolymer and (A2) an aromatic vinyl copolymer resin;
(B) zinc oxide;
(C) zinc phosphate; and
(D) surface-coated zinc oxide that is not the same as the zinc oxide (B), a surface of which is partially or entirely coated with zinc phosphate,
wherein the thermoplastic resin composition has an antibacterial activity of about 2 to about 7 against Staphylococcus aureus , as measured on 5 cm×5 cm specimens after dipping in a 3% acetic acid solution for 16 hours, inoculation with Staphylococcus aureus , and culturing under conditions of 35° C. and 90% RH for 24 hours in accordance with JIS Z 2801; and
wherein the thermoplastic resin composition has an antibacterial activity of about 2 to about 7 against Escherichia coli , as measured on 5 cm×5 cm specimens after dipping in a 3% acetic acid solution for 16 hours, inoculation with Escherichia coli , and culturing under conditions of 35° C. and 90% RH for 24 hours in accordance with JIS Z 2801.

2. The thermoplastic resin composition according to claim 1 , comprising:
about 100 parts by weight of the thermoplastic resin (A) comprising about 15 wt % to about 50 wt % of the rubber-modified vinyl graft copolymer (A1) and about 50 wt % to about 85 wt % of the aromatic vinyl copolymer resin (A2);
about 0.1 parts by weight to about 30 parts by weight of the zinc oxide (B);
about 0.1 parts by weight to about 30 parts by weight of the zinc phosphate (C); and
about 0.01 parts by weight to about 3 parts by weight of the surface-coated zinc oxide (D).

3. The thermoplastic resin composition according to claim 1 , wherein the rubber-modified vinyl graft copolymer (A1) is prepared by graft-polymerization of a monomer mixture comprising an aromatic vinyl monomer and a vinyl cyanide monomer to a rubber polymer.

4. The thermoplastic resin composition according to claim 1 , wherein the aromatic vinyl copolymer resin (A2) is a polymer of an aromatic vinyl monomer and a monomer copolymerizable with the aromatic vinyl monomer.

5. The thermoplastic resin composition according to claim 1 , wherein the zinc oxide (B) has an average particle diameter of about 0.5 μm to about 3 μm and a BET specific surface area of about 1 m2/g to about 10 m2/g.

6. The thermoplastic resin composition according to claim 1 , wherein the zinc phosphate (C) and the surface-coated zinc oxide (D) are prepared by reacting the zinc oxide with a phosphoric acid solution.

7. The thermoplastic resin composition according to claim 1 , wherein the zinc oxide (B) and the zinc phosphate (C) are present in a weight ratio (B:C) of about 1:0.1 to about 1:5.

8. The thermoplastic resin composition according to claim 1 , wherein the zinc phosphate (C) and the surface-coated zinc oxide (D) are present in a weight ratio (C:D) of about 1:0.01 to about 1:0.5.

9. A method of preparing a thermoplastic resin composition, comprising:
preparing a mixture of zinc phosphate and surface-coated zinc oxide, a surface of which is partially or entirely coated with zinc phosphate by reacting zinc oxide with phosphoric acid; and
blending the mixture with zinc oxide that is not the same as the surface-coated zinc oxide and a thermoplastic resin comprising a rubber-modified vinyl graft copolymer and an aromatic vinyl copolymer resin to provide a thermoplastic resin composition having an antibacterial activity of about 2 to about 7 against Staphylococcus aureus , as measured on 5 cm×5 cm specimens after dipping in a 3% acetic acid solution for 16 hours, inoculation with Staphylococcus aureus , and culturing under conditions of 35° C. and 90% RH for 24 hours in accordance with JIS Z 2801 and an antibacterial activity of about 2 to about 7 against Escherichia coli , as measured on 5 cm×5 cm specimens after dipping in a 3% acetic acid solution for 16 hours, inoculation with Escherichia coli , and culturing under conditions of 35° C. and 90% RH for 24 hours in accordance with JIS Z 2801.

10. A molded product formed of the thermoplastic resin composition according to claim 1 .

Assignees

• Lotte Advanced Mat Co Ltd

Inventors

• Yang Cheon Seok
• Bae Seung Yong
• Kim Yoen Kyoung
• Kim Ju Sung
• Park Kang Yeol

Classifications

• C08L55/02

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

• C08K2003/2296

  of zinc · CPC title

• C08K2003/321

  Phosphates · CPC title

• C08L2207/04

  Thermoplastic elastomer · CPC title

• C08L51/04 Primary

  grafted on to rubbers · CPC title