Thermoplastic rubber composition and molded product using same

Patent metadata

Field	Value
Publication number	US-9481786-B2
Application number	US-201314782922-A
Country	US
Kind code	B2
Filing date	Jun 26, 2013
Priority date	Apr 12, 2013
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

Disclosed is a thermoplastic rubber composition comprising, based on 100 parts by weight of a block terpolymer (A) of an aromatic vinyl compound and an alkene compound, 50 to 100 parts by weight of a paraffin oil (B), 30 to 70 parts by weight of an inorganic additive (C), 5 to 30 parts by weight of a polyolefin-based resin (D), and 30 to 70 parts by weight of an acryl-based resin (E). The hardness of the thermoplastic rubber composition may be freely adjusted and the thermoplastic rubber composition has a bonding strength of 2 to 4 N/mm as measured using a UTM according to a KS M 6518 peeling test method. Accordingly, bonding strength thereof to a thermoplastic resin is increased even without addition of an adhesive.

First claim

The invention claimed is:

1. A thermoplastic rubber composition comprising, based on 100 parts by weight of a block terpolymer (A) of an aromatic vinyl compound and an alkene compound,
50 to 100 parts by weight of a paraffin oil (B);
30 to 70 parts by weight of an inorganic additive (C);
5 to 30 parts by weight of a polyolefin-based resin (D); and
30 to 70 parts by weight of an acryl-based resin (E).

2. The thermoplastic rubber composition according to claim 1 , wherein the terpolymer (A) is an A-B-A′ type, wherein A and A′ blocks are hard segments and B block is a soft segment, wherein the terpolymer (A) comprises the hard segments in an amount of 20 to 35% by weight and the soft segment in an amount of 65 to 80% by weight.

3. The thermoplastic rubber composition according to claim 2 , wherein A and A′ blocks are aromatic vinyl-based polymers and B block is a conjugated diene-based polymer.

4. The thermoplastic rubber composition according to claim 1 , wherein the terpolymer (A) is selected from the group consisting of a styrene-ethylene-butadiene-styrene (SEBS) block copolymer, a styrene-ethylene-propylene-styrene (SEPS) block copolymer, a styrene-isoprene-styrene (SIS) block copolymer, a styrene-ethylene-isoprene-styrene (SEIS) block copolymer, a styrene-ethylene-ethylene-propylene-styrene (SEEPS) block copolymer and mixtures of two or more thereof.

5. The thermoplastic rubber composition according to claim 1 , wherein the terpolymer (A) has a weight-average molecular weight of 140,000 to 180,000 g/mol.

6. The thermoplastic rubber composition according to claim 1 , wherein the paraffin oil (B) has a kinematic viscosity of 95 to 215 cSt (at 40° C.).

7. The thermoplastic rubber composition according to claim 1 , wherein a ratio of the terpolymer (A) to the paraffin oil (B) is 2:1 to 2:2.

8. The thermoplastic rubber composition according to claim 1 , wherein the inorganic additive (C) is selected from the group consisting of calcium carbonate, talc, clay, silica, mica, titanium dioxide, carbon black, graphite, wollastonite, nano-silver and mixtures thereof.

9. The thermoplastic rubber composition according to claim 1 , wherein the polyolefin-based resin (D) has a melt index of 20 to 40 g/10 min under conditions of 230° C. and 2.16 kg.

10. The thermoplastic rubber composition according to claim 1 , wherein the polyolefin-based resin (D) is a polypropylene resin or a polypropylene-ethylene copolymer resin.

11. The thermoplastic rubber composition according to claim 1 , wherein the acryl-based resin (E) is selected from the group consisting of methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, sec-butyl acrylate, tert-butyl acrylate, amyl acrylate, isoamyl acrylate, n-hexyl acrylate, cyclohexyl acrylate, 2-ethylhexyl acrylate, pentadecyl acrylate, dodecyl acrylate, isobornyl acrylate, phenyl acrylate, benzyl acrylate, phenoxyethyl acrylate, 2-hydroxyethyl acrylate, 2-methoxyethyl acrylate, glycidyl acrylate, allyl acrylate, ethylene methyl acrylate and mixtures thereof.

12. A molded product manufactured from the thermoplastic rubber composition according to claim 1 .

13. A composite thermoplastic resin, comprising (a) at least one thermoplastic resin selected from the group consisting of a styrene-based resin, a polycarbonate-based resin and a polyolefin-based resin, and (b) the thermoplastic rubber composition according to claim 1 laminated on the thermoplastic resin (a).

14. A molded product manufactured from the composite thermoplastic resin according to claim 13 .

15. The molded product according to claim 14 , wherein the molded product has a bonding strength of 2 to 4 N/mm measured using a UTM according to a KS M 6518 peeling test.

16. The molded product according to claim 14 , wherein the molded product has a surface hardness of 30 to 80 A according to KS M 6518 and a tensile strength of 40 to 150 kgf/cm 2 according to KS M 6518.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Kim Jung Wook
• Shin Chan Gyun
• Lim Jong Cheol

Classifications

• C08J2433/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title

• C08L2207/04

  Thermoplastic elastomer · CPC title

• C08J2423/12

  Polypropene · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08J5/00

  Manufacture of articles or shaped materials containing macromolecular substances (manufacture of semi-permeable membranes B01D67/00 - B01D71/00) · CPC title