Transparent abs resin and transparent abs resin composition

Patent metadata

Field	Value
Publication number	US-2016215083-A1
Application number	US-201414771187-A
Country	US
Kind code	A1
Filing date	Aug 21, 2014
Priority date	Aug 29, 2013
Publication date	Jul 28, 2016
Grant date	—

Abstract

The present invention provides a transparent acrylonitrile-butadiene-styrene (ABS) resin and a transparent ABS resin composition. Specifically, according to the present invention, a transparent ABS resin and a transparent ABS resin composition, which have excellent transparency and impact resistance, can be provided by minimizing the degree of impregnation of a styrene monomer into a polybutadiene rubber latex while allowing the styrene monomer to constitute a graft shell to thereby effectively form the graft shell. Particularly, according to the present invention, a transparent ABS resin composition having high transparency and impact resistance can be provided, despite applying a reducing agent and Fe ions, which adversely affected the transparency of ABS resin in the prior art, to ABS resin.

First claim

1 . A transparent acrylonitrile-butadiene-styrene (ABS) resin comprising: 50-60 wt % of a polybutadiene rubber latex; and 50-40 wt % of a sum of a methyl methacrylate monomer, a styrene monomer and an acrylonitrile monomer,
wherein a degree of impregnation of the styrene monomer into the polybutadiene rubber latex is 0.005 or less.

2 . The transparent ABS resin of claim 1 , wherein the polybutadiene rubber latex has a swelling index of 10-20.

3 . The transparent ABS resin of claim 1 , wherein the polybutadiene rubber latex has a gel content of 85-94%.

4 . The transparent ABS resin of claim 1 , wherein the polybutadiene rubber latex has a mean particle size of 2500-4000 Å.

5 . The transparent ABS resin of claim 1 , wherein the methyl methacrylate monomer is one or more selected from among (meth)acrylic acid methyl ester, (meth)acrylic acid ethyl ester, (meth)acrylic acid propyl ester, (meth)acrylic acid 2-ethylhexyl ester, (meth)acrylic acid decyl ester, and (meth)acrylic acid lauryl ester, and is present in an amount of 27-36 wt % based on the total weight of the transparent ABS resin.

6 . The transparent ABS resin of claim 1 , wherein the styrene monomer is one or more selected from among styrene, α-methyl styrene, p-methyl styrene, and vinyl toluene, and is present in an amount of 10-13 wt % based on the total weight of the transparent ABS resin.

7 . The transparent ABS resin of claim 1 , wherein the acrylonitrile monomer is one or more selected from among acrylonitrile, methacrylonitrile and ethacrylonitrile, and is present in an amount of 2-6 wt % based on the total weight of the transparent ABS resin.

8 . A method for preparing the transparent ABS resin, the method comprising the steps of:
(1) introducing a butadiene monomer in portions to prepare a polybutadiene rubber latex having a gel content of 85-94%; and (2) continuously adding 50-40 wt % of a sum of a methyl methacrylate monomer, a styrene monomer and an acrylonitrile monomer to 50-60 wt % of the polybutadiene rubber latex, and, at the same time, graft-polymerizing the monomers in the presence of a reactive emulsifier and an oil-soluble polymerization initiator to prepare the transparent ABS resin.

9 . The method of claim 8 , wherein step (1) comprises continuously introducing the butadiene monomer after a degree of conversion of the butadiene monomer reaches 60-80%.

10 . The method of claim 8 , wherein step (1) comprises continuously introducing 10-20 parts by weight of the butadiene monomer over 20 minutes from a time point at which a degree of conversion of the butadiene monomer is 50-60%, elevating a temperature of the butadiene monomer to a temperature between 40° C. and 55° C., and then continuously introducing 40-60 parts by weight of the butadiene monomer over 7-9 hours until the degree of conversion of the butadiene monomer reaches 80%.

11 . The method of claim 9 , wherein the temperature of the butadiene monomer is elevated to 75° C. at a time point at which the degree of conversion of the butadiene monomer is 80%, and a final degree of conversion of the butadiene monomer is 95-99%.

12 . The method of claim 8 , wherein one or more crosslinkers selected from among divinylbenzene, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, 1,3-butylene glycol dimethacrylate, aryl methacrylate, 1,3-butylene glycol diacrylate, polyethylene glycol (meth)acrylate, polyethylene glycol di(meth)acrylate, and polypropylene glycol di(meth)acrylate, are added in an initial stage of step (1) in an amount of 0.1-5 parts by weight based on 100 parts by weight of the total weight of the butadiene monomer used in step (1).

13 . The method of claim 8 , wherein the reactive emulsifier is one or more selected from among sodium dodecyl allyl sulfosuccinate (TREM LF-40), dipotassium C16-C18 alkenyl succinate (Latemul ASK series), sodium acrylamidostearate (NaAAS), and sodium 3-sulfopropyl tetradodecyl malate (M14), and is used in an amount of 0.1-2 parts by weight based on 100 parts by weight of the total weight of the latex and monomers used in step (2).

14 . The method of claim 8 , wherein the oil-soluble polymerization initiator is one or more selected from among diisopropylbenzene hydroperoxide, t-hexyl hydroperoxide, 1,1,3,3-tetramethylbutyl hydroperoxide, dicumyl peroxide, t-butylcumyl peroxide, methyl ethyl ketone peroxide, methyl isobutyl ketone peroxide, cyclohexanone peroxide, cumene hydroperoxide, t-butyl hydroperoxide, benzoyl peroxide, lauroyl peroxide, 1,1-di(t-butylperoxy)cyclohexane, 1,1-di(t-butylperoxy)-3,3,5 -trimethylcyclohexane, t-butylperoxy benzoate, t-butylperoxy 2-ethyl hexanoate, and bis(4-t-butylcyclohexyl)peroxydicarbonate, and is used in an amount of 0.01-5 parts by weight based on 100 parts by weight of the total weight of the latex and monomers used in step (2).

15 . The method of claim 8 , wherein step (1) is performed for a total reaction time of 18-20 hours.

16 . A transparent acrylonitrile-butadiene-styrene (ABS) resin composition comprising: a transparent ABS resin; and a styrene-acrylonitrile (SAN) or methyl methacrylate-styrene-acrylonitrile (MSAN) resin,
wherein the transparent ABS resin comprises 50-60 wt % of a polybutadiene rubber latex and 50-40 wt % of a sum of a methyl methacrylate monomer, a styrene monomer and an acrylonitrile monomer, wherein a degree of impregnation of the styrene monomer into the polybutadiene rubber latex is 0.005 or less.

17 . The transparent ABS resin composition of claim 16 , wherein the polybutadiene rubber latex has a swelling index of 10-20.

18 . The transparent ABS resin composition of claim 16 , wherein a content of the transparent ABS resin in the composition is 5-25%.

19 . The transparent ABS resin composition of claim 16 , wherein the SAN or MSAN resin is a resin prepared by subjecting 0-75 parts by weight of a (meth)acrylic acid alkyl ester monomer, 10-50 parts by weight of a styrene monomer and 10-20 parts by weight of an acrylonitrile monomer to bulk polymerization, solution polymerization or suspension polymerization.

20 . A thermoplastic transparent resin which is prepared by extruding and injection-molding the transparent ABS resin composition of claim 16 and has a light transmittance of 90.5 or higher as measured on a 3 mm thick sheet at room temperature in accordance with ASTM D1003, a haze value of 2.0 or less as measured on a 3 mm thick sheet at room temperature in accordance with ASTM D1003, and an Izod impact strength of 15 or higher as measured in accordance with ASTM D256 (¼″).

Assignees

• Lg Chemical Ltd
• Lg Chemical Ltd

Inventors

• Jang Seok Goo
• Park Sang Hoo
• Lee Roo Da
• Lee Won Seok
• Choi Jeong Su
• Yoo Jeun Hoon

Classifications

• C08L55/02 Primary

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

• C08F279/04 Primary

  Vinyl aromatic monomers and nitriles as the only monomers · CPC title

• C08L2201/10

  Transparent films; Clear coatings; Transparent materials · CPC title

• C08L33/20

  Homopolymers or copolymers of acrylonitrile (C08L55/02 takes precedence) · CPC title

• C08F279/02

  on to polymers of conjugated dienes · CPC title