Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1993-12-03
1995-10-03
Hamilton, III, Thomas
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524127, 524143, C08K 552, C08L 7112, C08L 6900, C08L 2506
Patent
active
054552923
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a resin composition which is excellent in flame retardance and is obtained by incorporating a specific phosphoric acid ester compound into a specific thermoplastic resin not having halogen (hereinafter, a non-halogenated thermoplastic resin). A flame retardant agent contained in the resin composition does not cause smoking or volatilize during a molding processing and also does not bleed to the surface of the moldings. Moldings of the resin composition do not discolor, blister and deteriorate in electrical properties and the like due to water absorption.
BACKGROUND ART
A synthetic resin is widely used as a material for construction of buildings, electrical machinery and devices, automobiles and fibers because it is generally light, excellent in water and chemical resistance, has excellent electrical insulating and mechanical properties, and is easy to mold. However, a synthetic resin has the drawback that it is more flammable than a metallic or inorganic material. Consequently, various methods for imparting flame retardance to a synthetic resin have been proposed. Of these, a method of incorporating a halogen compound, a phosphorus compound, an inorganic hydrate and the like into the synthetic resin is most widely used. Particularly, an organic phosphoric acid ester compound such as triphenyl phosphate, cresyl diphenyl phosphate, or tricresyl phosphate is widely used industrially. However, conventionally used flame retardant agents have drawbacks in causing smoking and volatilizing during the molding processing, bleeding to the surface of moldings and the like.
In order to alleviate the above drawbacks in practice, it has been attempted to use a phosphoric acid ester compound having high molecular weight as a flame retardant agent. For example, European Patent Unexamined Publication No. 7,460 discloses a tri(2,6-dimethylphenyl)phosphate compound; European Patent Unexamined Publication Nos. 129,824, 129,825 and 135,726 and British Patent Unexamined Publication No. 2,043,083 disclose a resorcinol-bisdiphenyl phosphate compound and the like; and U.S. Pat. No. 4,683,255 discloses a tribiphenyl phosphate compound. However, large amounts of these phosphoric acid ester compounds must be used in order to impart flame retardance to the resin. Further, according to our research findings, these phosphoric acid ester compounds do not satisfy recently established standards because they cause corrosion during molding, they are denatured during molding or during prolonged use of the moldings, and cause the moldings to discolor, blister and deteriorate in electrical properties and flame retardance due to water absorption and the like.
Thus, the art has not been able to provide a resin composition possessing both sufficient flame retardance and performance as a product.
DISCLOSURE OF THE INVENTION
The present invention provides a thermoplastic resin composition not having halogen (hereinafter, a non-halogenated thermoplastic resin composition), which is free from problems such as denaturation, volatilization and bleeding of the flame retardant agent, has excellent flame retardance and maintains its initial properties during prolonged use, when recycled or when used under other more severe conditions. The present invention not only provides a resin composition having excellent properties, but also solves global environmental problems by imparting flame retardance to the resin with a flame retardant agent not containing halogen; market demand for such resins is increasing because they are environmentally friendly and safe to use.
The present invention provides a composition comprising a specific non-halogenated thermoplastic resin (component (A)) and a specific phosphoric acid ester compound (component (B)). In particular, the structure of component (B) of the present invention contains a specific linker derived from a bis(hydroxyaryl)alkane and an alkyl-substituted phenyl moieties at the terminal so that a resin composition excellent in flame retardance, wherein the fl
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Kakegawa Junko
Takayama Shigeki
Asahi Kasei Kogyo Kabushiki Kaisha
Hamilton, III Thomas
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