Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1997-09-02
2000-07-25
Sanders, Kriellion
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524409, 524434, 524436, 252609, C08K 552, C08K 310, C09K 2100
Patent
active
060937602
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a low volatility flame retardant for a styrene resin. More particularly, the present invention relates to a low volatility flame retardant for a styrene resin which forms no mold deposit even after a prolonged continuous molding, and a resin composition comprising such a flame retardant.
BACKGROUND ART
Because of its excellent impact resistance in addition to excellent moldability, a styrene resin has found wide application in many fields such as automobile parts, household appliance and OA (office automation) equipment parts. However, the styrene resin has restricted usage due to its flammability.
A known method for flame-retarding the styrene resin is to incorporating a halogen, phosphorus or inorganic flame retardant in the styrene resin. This method can attain flame retardation to some extent. However, the use of a halogen flame retardant disadvantageously causes environmental hazard. The use of a phosphorus or inorganic flame retardant is not satisfactory in the resulting impact strength, melt flowability and heat resistance. Further, a non-volatile organic phosphorus compound can cause staining of mold, i.e., so-called mold deposit during molding, reducing the productivity. The mold staining may be transferred to molded products, causing stress crack thereof. Thus, the industrial use is restricted.
As an approach for improving the volatility there is disclosed a resin composition for laminate comprising a phenolic resin and a specific monomeric alkyl-substituted phosphate (JP-A-1-95149 (The term "JP-A" as used herein means an "unexamined published Japanese patent application"), JP-A-1-242633, JP-A-1-193328). The flame retardants disclosed in these documents apply to thermosetting resins. Thus, these flame retardants are not those for the styrene resin of the present invention.
An antistatic agent comprising a sulfonate and a phosphate such as dinonylphenyl phenylphosphate (JP-A-3-64368) and a lubricant comprising a polyol ester and a triaryl phosphate such as bisnonylphenyl phehylphosphate (U.S. Pat. No. 4,780,229) are disclosed. However, these compounds disclosed in these documents are not flame retardants and differ essentially from the present invention.
There have been known a resin composition comprising a polycarbonate, an ABS resin, a halogenated phosphate and a polytetrafluoroethylene (WO9106598), a resin composition comp-rising a polycarbonate, an AAS resin, a phosphate and a polytetrafluoroethylene (EP534297), a resin composition comprising a polycarbonate, an ABS resin, a phosphate and a polytetrafluoroethylene (DE4309142), a resin composition comprising a polycarbonate, an ABS resin, an aromatic phosphate and a metal salt of aromatic sulfinic acid (JP-A-6-299060), a resin composition comprising a polycarbonate, a polyester polycarbonate, an ABS resin, a phosphate and a polytetrafluoroethylene (EP482451), and a resin composition comprising a polycarbonate, an ABS resin, a phosphate and a polycarbonate-siloxane block copolymer (DE4016417). The phosphate to be incorporated in the foregoing polycarbonate resin composition comprises no phosphate having a specific substituent and thus exhibits a poor balance between non-volatility and flame retardance.
Further, there have been disclosed a flame retardant comprising a phosphate having a phenyl group, an isopropylphenyl group and a C.sub.4-2 alkyl-substituted phenyl group (JP-A-2-792 corresponding to EP324716), a flame retardant resin comprising a polyphenylene ether, a styrene resin and tris(isopropylphenyl)phosphate (JP-A-1-48844), and a functional fluid composition comprising a polystyrene, t-butylphenyl phenylphosphate and a polyol ester (U.S. Pat. No. 4,645,615). The total number of carbon atoms in the substituents in the phosphate of these documents on the number average falls below 12 based on the definition in the present invention described later. Thus, these compounds are insufficient in non-volatility.
The expression "C.sub.x-y alkyl" and the like used herein means "alkyl having from
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Nishihara Hajime
Tanji Susumu
Asahi Kasei Kogyo Kabushiki Kaisha
Sanders Kriellion
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