# US 10,370,535 B2 · Flame retardant resin composition and molded article using the same

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- Number: US 10,370,535 B2
- Document ID: US10370535B2
- Status: Granted
- Kind: B2
- Application number: 15/609,105
- Filed: 2017-05-31
- Published: 2017-12-07
- Granted: 2019-08-06
- Earliest claimed: 2016-06-03
- Assignees: Lotte Advanced Materials Co., Ltd.
- Applicants: Lotte Advanced Materials Co., Ltd.
- Inventors: Jo Won Lee
- Web page: https://patentgrep.com/patent/US10370535B2

## CPC

- C08L 69/00: Compositions of polycarbonates; Compositions of derivatives of polycarbonates
- C08K 3/26: Carbonates; Bicarbonates
- C08L 51/085: {on to polysiloxanes}
- C09K 21/02: Inorganic materials
- C08K 3/016: Flame-proofing or flame-retarding additives
- C08K 2003/265: {Calcium, strontium or barium carbonate}
- C08K 2003/267: {Magnesium carbonate}
- C08K 2201/014: Additives containing two or more different additives of the same subgroup in C08K
- C08L 2201/02: Flame or fire retardant/resistant
- C08L 2207/53: Core-shell polymer
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

A flame retardant resin composition that can have excellent low smoke properties includes (A) a polycarbonate resin, (B) a silicon impact modifier, and (C) a flame retardant, wherein the (B) silicon impact modifier comprises particles having a core-shell structure, and including about 60 wt % or more of a siloxane polymer, and wherein the (C) flame retardant includes a mixture of magnesium carbonate represented by Formula 1 and magnesium calcium carbonate represented by Formula 2: Mga(CO3)b(OH)2a−2b.cH2O [Formula 1] wherein a, b and c are as defined in the detailed description; MgxCay(CO3)x+y.mH2O [Formula 2] wherein x, y and m are as defined in the detailed description.

## Claims

### Claim 1

A flame retardant resin composition comprising:
(A) a polycarbonate resin;
(B) a silicon impact modifier; and
(C) a flame retardant,
wherein the (B) silicon impact modifier comprises particles having a core-shell structure and comprises about 60 wt % or more of a siloxane polymer,
wherein the (C) flame retardant comprises a mixture of magnesium carbonate represented by Formula 1 and magnesium calcium carbonate represented by Formula 2:
Mga(CO3)b(OH)2a−2b.cH2O [Formula 1]
wherein a is 1 to 6, b is greater than 0 to 5, and c is 0 to 6;
MgxCay(CO3)x+ymH2O [Formula 2]
wherein x and y are the same or different and are each independently 1 to 5, and m is 0 to 5, and
wherein the flame retardant includes the magnesium carbonate represented by Formula 1 and the magnesium calcium carbonate represented by Formula 2 in a weight ratio of about 3:1 to about 2:1.

### Claim 2 (depends on 1)

The resin composition according to claim 1, comprising the (B) silicon impact modifier in an amount of about 1 part by weight to about 10 parts by weight relative to about 100 parts by weight of the (A) polycarbonate resin.

### Claim 3 (depends on 1)

The resin composition according to claim 1, wherein the (B) silicon impact modifier comprises a core comprising a siloxane polymer and optionally further comprising a (meth)acrylic polymer and a shell comprising a (meth)acrylic polymer.

### Claim 4 (depends on 3)

The resin composition according to claim 3, wherein the (B) silicon impact modifier comprises a core composed of a siloxane polymer and a shell composed of a (meth)acrylic polymer.

### Claim 5 (depends on 3)

The resin composition according to claim 3, wherein the (B) silicon impact modifier comprises a core comprising a siloxane polymer and a (meth)acrylic polymer and a shell comprising a (meth)acrylic polymer.

### Claim 6 (depends on 3)

The resin composition according to claim 3, wherein the (B) silicon impact modifier comprises the siloxane polymer and the (meth)acrylic polymer in a weight ratio of about 3:1 to about 10:1.

### Claim 7 (depends on 1)

The resin composition according to claim 1, comprising the mixture of magnesium carbonate represented by Formula 1 and magnesium calcium carbonate represented by Formula 2 in an amount of about 1 part by weight to about 20 parts by weight relative to about 100 parts by weight of the (A) polycarbonate resin.

### Claim 8 (depends on 1)

The resin composition according to claim 1, wherein the magnesium carbonate represented by Formula 1 is hydromagnesite.

### Claim 9 (depends on 1)

The resin composition according to claim 1, wherein the magnesium calcium carbonate represented by Formula 2 is huntite.

### Claim 10 (depends on 1)

The resin composition according to claim 1, wherein the flame retardant comprises a mixture of hydromagnesite and huntite.

### Claim 11 (depends on 1)

The resin composition according to claim 1, wherein a molded article produced from the resin composition has a cumulative value of specific optical densities in the first 4 min of the test (VOF4) of about 150 minutes to about 300 minutes as measured in accordance with ISO 5659-2; a critical heat flux at extinguishment (CFE) of about 10 to about 25 kW/m2 as measured in accordance with ISO 5658-2; and a maximum average rate of heat emission (MARHE) of about 80 to about 105 kW/m2 as measured in accordance with ISO 5660-1.

### Claim 12 (depends on 1)

A molded article produced from the flame retardant resin composition according to claim 1.

### Claim 13 (depends on 12)

The molded article according to claim 12, wherein the molded article has a cumulative value of specific optical densities in the first 4 min of the test (VOF4) of about 300 minutes or less, as measured in accordance with ISO 5659-2.

### Claim 14 (depends on 12)

The molded article according to claim 12, wherein the molded article has a cumulative value of specific optical densities in the first 4 min of the test (VOF4) of about 150 minutes to about 300 minutes, as measured in accordance with ISO 5659-2.

### Claim 15 (depends on 12)

The molded article according to claim 12, wherein the molded article has a critical heat flux at extinguishment (CFE) of about 10 kW/m2 or more, as measured in accordance with ISO 5658-2.

### Claim 16 (depends on 12)

The molded article according to claim 12, wherein the molded article has a critical heat flux at extinguishment (CFE) of about 10 to about 25 kW/m2, as measured in accordance with ISO 5658-2.

### Claim 17 (depends on 12)

The molded article according to claim 12, wherein the molded article has a maximum average rate of heat emission (MARHE) of about 105 kW/m2 or less, as measured in accordance with ISO 5660-1.

### Claim 18 (depends on 12)

The molded article according to claim 12, wherein the molded article has a maximum average rate of heat emission (MARHE) of about 80 to about 105 kW/m2, as measured in accordance with ISO 5660-1.

### Claim 19 (depends on 12)

The molded article according to claim 12, wherein the molded article is an interior and/or exterior material of transportation equipment.