# US 10,119,019 B2 · Environmental friendly flame retardant moulding compositions based on thermoplastic impact modified styrenic polymers

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- Number: US 10,119,019 B2
- Document ID: US10119019B2
- Status: Granted
- Kind: B2
- Application number: 15/308,689
- Filed: 2014-05-06
- Published: 2017-07-06
- Granted: 2018-11-06
- Earliest claimed: 2014-05-06
- Assignees: Italmatch Chemicals S.P.A.
- Applicants: ITALMATCH CHEMICALS S.p.A.
- Inventors: Ugo Zucchelli; Massimiliano Rosichetti
- Web page: https://patentgrep.com/patent/US10119019B2

## CPC

- C08L 55/02: ABS [Acrylonitrile-Butadiene-Styrene] polymers
- C08K 3/32: Phosphorus-containing compounds
- C08K 5/5333: Esters of phosphonic acids
- C08K 7/02: Fibres or whiskers
- C08L 25/08: Copolymers of styrene (C08L29/08, C08L35/06, C08L55/02 take precedence)
- C08L 27/08: Homopolymers or copolymers of vinylidene chloride
- C08L 27/18: Homopolymers or copolymers or tetrafluoroethene
- C08L 2201/22: Halogen free composition
- 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)

## Abstract

Object of the present invention is to provide halogen-free highly flame retardant styrene impact modified polymers able to perform V0 classification on thin items, according to international standard UL-94.

## Claims

### Claim 1

Halogen free flame retardant impact modified styrenic thermoplastic composition consisting entirely of:
a) one or more thermoplastic impact modified styrenic polymers;
b) a first flame retardant (FR) component comprising one or more hypophosphorous acid metal salts having a phosphorus valence state being equal to +1;
c) a second flame retardant (FR) component comprising one or more aromatic phosphorus esters;
d) one or more antidripping agents;
e) at least one of fillers and reinforcing fibers; and
f) conventional additives.

### Claim 2 (depends on 1)

The halogen free flame retardant impact modified styrenic thermoplastic composition according to claim 1, wherein said conventional additives are selected from the group consisting of processing aids, heat and process stabilizers, UV stabilizers, pigments, dispersing agents, mold release additives, nucleating agents and their mixtures.

### Claim 3 (depends on 1)

The halogen free flame retardant impact modified styrenic thermoplastic composition according to claim 1, wherein said hypophosphorus acid metal salt is aluminium hypophosphite.

### Claim 4 (depends on 1)

The halogen free flame retardant impact modified styrenic thermoplastic composition according to claim 1, wherein said aromatic phosphorus ester is resorcinol bis (2,6-dixylenyl phosphate).

### Claim 5 (depends on 1)

The halogen free flame retardant impact modified styrenic thermoplastic composition according to claim 1, wherein said antidripping agent is based on polytetrafluoroethylene (PTFE).

### Claim 6 (depends on 1)

The halogen free flame retardant impact modified styrenic thermoplastic composition according to claim 1, wherein said styrene impact modified thermoplastic polymer is acrylonitryle butadiene styrene copolymer (ABS).

### Claim 7 (depends on 1)

The halogen free flame retardant impact modified styrenic thermoplastic composition according to claim 1, wherein said styrene impact modified thermoplastic polymer is high impact polystyrene (HIPS).

### Claim 8 (depends on 1)

The halogen free flame retardant impact modified styrenic thermoplastic composition according to claim 1, wherein said first and said second flame retardant components are intimately mixed, obtaining a not flammable powder mixture.

### Claim 9

A method for forming a flame retardant moulding product comprising:
providing a composition consisting entirely of one or more thermoplastic impact modified styrenic polymers, a first flame retardant (FR) component comprising one or more hypophosphorus acid metal salts having a phosphorus valence state being equal to +1, one or more aromatic phosphorus esters as a second FR component, one or more antidripping agents, at least one of fillers and reinforcing fibers, and conventional additives; and
manufacturing a moulding composition or a moulding article using said composition.

### Claim 10 (depends on 9)

The method as in claim 9, wherein said hypophosphorus acid metal salt is aluminium hypophosphite and said aromatic phosphorus ester is resorcinol bis (2,6-dixylenyl phosphate).

### Claim 11 (depends on 9)

The method as in claim 9, wherein said styrene impact modified thermoplastic polymer is acrylonitryle butadiene styrene copolymer ABS.

### Claim 12 (depends on 9)

The method as in claim 9, wherein said styrene impact modified thermoplastic polymer is high impact polystyrene HIPS.

### Claim 13 (depends on 9)

The method as in claim 9, wherein providing includes mixing said first and said second FR components to produce a non flammable powder mixture.