Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1991-11-05
1993-10-05
Buttner, David J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524109, 524114, 524339, 524373, 524409, 525 65, 525 67, 525463, C08K 506, C08K 322, C08L 6900, C08L 5502
Patent
active
052505901
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a flame retardant resin composition with good heat stability, which comprises a rubber-reinforced thermoplastic resin, a polycarbonate resin and a halogen-containing compound having a specific chemical structure.
DESCRIPTION OF THE PRIOR ART
A resin composition comprising a rubber-reinforced styrene base resin, typically an ABS resin and an AES resin, and a polycarbonate resin is widely used as a material having good heat resistance and impact resistance. However, since such resin composition is an inflammable material, it has some limitation when it is used in electrical or electronic equipments which should have flame retardancy, for example, a self-extinguishing property (V-0, V-1 and V-2 classes) according to the United States Underwriters Laboratories (UL) Standard 94.
To impart flame retardancy, there is used a halogen-containing compound such as tetrabromobisphenol A (TBA) and decabromodiphenyl ether (DBDE) or a combination of the halogen-containing compound with an antimony compound. Though the resin composition can be made flame retardant by the addition of such compound, there arises some problems that heat resistance and impact resistance which are characteristic features of the resin composition are significantly deteriorated.
Recently, it is proposed to impart flame retardancy to the resin composition without sacrificing heat resistance and impact resistance by the addition of a high molecular weight halogen-containing compound of the formula: ##STR2## wherein X is a hydrogen atom, a Chlorine atom or a bromine atom and n is a number of 35 to 100 (see Japanese Patent Kokai Publication No. 22958/1989 ). However, the resin composition containing such high molecular weight compound has decreased processability and poor heat stability and is not a satisfactory material.
A material to be used in a machine which may used near a window such as a personal computer and a facsimile machine is required to have light resistance.
DETAILED DESCRIPTION OF THE INVENTION
As a result of the extensive study in view of the above problems, the present inventors have found that the addition of a halogen-containing compound having a specific chemical structure to a resin composition significantly improves heat stability and light stability without sacrificing good heat resistance and impact resistance which are characteristics of the resin composition and have completed the present invention.
Accordingly, the present invention provides a flame retardant resin composition comprising (A) 70 to 10% by weight of a rubber-reinforced styrene base resin, (B) 20 to 85% by weight of polycarbonate resin, (C) 5 to 35% by weight of a high molecular weight halogen-containing compound of the formula: ##STR3## wherein n is an average polymerization degree and an integer of 4 to 30, R and R' are independently a hydrogen atom, a methyl group, an epoxypropyl group, a phenyl group, a halogenated phenyl group or a group of the formula: ##STR4## wherein m is an integer of 0 to 3, which compound has a bromine content of at least 45% by weight and an epoxy equivalent of at least 10,000 g/mol, and (D) 0 to 10% by weight of an antimony compound.
The flame retardant resin composition of the present invention will be explained in detail.
The rubber-reinforced styrene base resin (A) to be used in the present invention is a graft copolymer which is obtained by polymerizing an aromatic vinyl compound and optionally other copolymerizable vinyl compound in the presence of a rubber polymer, or a mixture of said graft copolymer and an aromatic vinyl polymer which is obtained by polymerizing an aromatic vinyl compound and optionally other copolymerizable vinyl compound.
Examples of the rubber polymer which constitutes the rubber-reinforced styrene base resin (A) are diene base rubbery polymers such as polybutadiene, butadiene-styrene copolymer and butadiene-acrylonitrile copolymer; and non-diene base rubbery polymers such as ethylene-propylene copolymer, ethylene-propylene-non-conjugated d
REFERENCES:
patent: 4879329 (1989-11-01), Hongo et al.
Chemical Abstracts 115:209453n (1991).
Kondou Ichiro
Matsumoto Koji
Matsuzaki Hidetaka
Nakai Fumio
Buttner David J.
Sumitomo Naugatuck Co. Ltd.
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