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Softening agent in a low gloss compound
December 1998
Additives for Polymers
possible to reduce the environmental hazards arising from the incineration of fumes.
rubber and a crystalline propylene, dynamically heat treated.
The collection of results shows that the talc/polymer interface characteristics influence both the mechanical and ignition resistance characteristics of the compound. Increasing the nucleating effect produced by the mineral gives better adhesion of the polymer to the filler and a stronger reinforcing effect. This effect, which is amplified by increase of specific surface, leads also to improved fire properties as a result of the energy consumed to make the crystallites melt and the limitation of heat transfer produced by a layer of mineral particles of a strong specific surface ratio.
Patent No: JO8 100090
The use of pure talcs of fine particle and high lamellarity index, in combination with a new generation bromohalogenated compound, makes it possible to obtain optimum mechanical properties and fire resistance as well as limitation of emission of corrosive products, compared with traditional and more costly solutions. Among the minerals studied, the Luzenac talcs coded B and C (see the table) showed a high resistance to flame in polyolefins in synergy with bromine compounds, and are recommended for various applications, such as connectors, electrical and appliances. Phstiques Modernes June/July 1998, pp 18-19
PATENTS
et
EhstomZres
IN FOCUS
(In this section we take a longer look at selectedpatents and place them in context with current and expected trends)
Softening agent in a low gloss compound A softening agent plays an important role in formulation of a low-gloss thermoplastic olefin elastomer compound, developed by Showa Denko. It is a mixture of a crosslinked ethylene-propylene copolymer
10
Priority date: 29 September tion date: 16 April 1996.
which is
1994; publica-
The thermoplastic olefin-type elastomer compound comprises 35-85 parts by weight of crosslinked ethylene-propylene copolymer rubber, 65-15 parts by weight of crystalline propylene polymer resin (having a molecular weight distribution of at least 3.0, and containing 1.0-l 0.0% by weight of a component with a molecular weight of at least 500,000) and 5-200 parts by weight of softening agents. The patent also covers production of an elastomer compound by subjecting a mixture of ethylene-propylene copolymer rubber, crystalline propylene resin and softening agents, to dynamic heat treatment in the presence of organic peroxides. The resulting elastomer compound has low gloss and excellent appearance and fluidity, it is claimed. Contact: Showa Denko KK, I-l 3-9, ShibaDaimon, Minato-ku, Tokyo 105, Japan; tel: i-81-3-5470-3111; fax: +81-3-3431-6442. (Extended summaries or fill copies of the patents described here can be obtainedfiom Derwent Information Ltd, Derwent House, 24 Great Queen Street, London, WC2B 5DF, UK; tel: +44-l 71 355 2800; fmc: + 44-171 344 2900)
LITERATURE UN issues CD-ROM database on chemical legislation A comprehensive database on chemical legislation in 25 countries has been published as a CD-ROM by the United Nations Economic Commission for Europe (UN/ECE). It covers 15 sectors of the industry,
01998 Elsevier Science
Additives for Polymers
possible to reduce the environmental hazards arising from the incineration of fumes.
rubber and a crystalline propylene, dynamically heat treated.
The collection of results shows that the talc/polymer interface characteristics influence both the mechanical and ignition resistance characteristics of the compound. Increasing the nucleating effect produced by the mineral gives better adhesion of the polymer to the filler and a stronger reinforcing effect. This effect, which is amplified by increase of specific surface, leads also to improved fire properties as a result of the energy consumed to make the crystallites melt and the limitation of heat transfer produced by a layer of mineral particles of a strong specific surface ratio.
Patent No: JO8 100090
The use of pure talcs of fine particle and high lamellarity index, in combination with a new generation bromohalogenated compound, makes it possible to obtain optimum mechanical properties and fire resistance as well as limitation of emission of corrosive products, compared with traditional and more costly solutions. Among the minerals studied, the Luzenac talcs coded B and C (see the table) showed a high resistance to flame in polyolefins in synergy with bromine compounds, and are recommended for various applications, such as connectors, electrical and appliances. Phstiques Modernes June/July 1998, pp 18-19
PATENTS
et
EhstomZres
IN FOCUS
(In this section we take a longer look at selectedpatents and place them in context with current and expected trends)
Softening agent in a low gloss compound A softening agent plays an important role in formulation of a low-gloss thermoplastic olefin elastomer compound, developed by Showa Denko. It is a mixture of a crosslinked ethylene-propylene copolymer
10
Priority date: 29 September tion date: 16 April 1996.
which is
1994; publica-
The thermoplastic olefin-type elastomer compound comprises 35-85 parts by weight of crosslinked ethylene-propylene copolymer rubber, 65-15 parts by weight of crystalline propylene polymer resin (having a molecular weight distribution of at least 3.0, and containing 1.0-l 0.0% by weight of a component with a molecular weight of at least 500,000) and 5-200 parts by weight of softening agents. The patent also covers production of an elastomer compound by subjecting a mixture of ethylene-propylene copolymer rubber, crystalline propylene resin and softening agents, to dynamic heat treatment in the presence of organic peroxides. The resulting elastomer compound has low gloss and excellent appearance and fluidity, it is claimed. Contact: Showa Denko KK, I-l 3-9, ShibaDaimon, Minato-ku, Tokyo 105, Japan; tel: i-81-3-5470-3111; fax: +81-3-3431-6442. (Extended summaries or fill copies of the patents described here can be obtainedfiom Derwent Information Ltd, Derwent House, 24 Great Queen Street, London, WC2B 5DF, UK; tel: +44-l 71 355 2800; fmc: + 44-171 344 2900)
LITERATURE UN issues CD-ROM database on chemical legislation A comprehensive database on chemical legislation in 25 countries has been published as a CD-ROM by the United Nations Economic Commission for Europe (UN/ECE). It covers 15 sectors of the industry,
01998 Elsevier Science