TH13637B - Flame retardants with resistance to thermal degradation? Components of synthetic resins and materials derived from molding. - Google Patents

Abstract

Flame retardants with thermal degradation resistance composed of magnesium hydroxide particles having (i) an average diameter of secondary particles not exceeding 2 microns, measured by the laser diffraction scuttering method; (ii) a specific surface area not exceeding 20 m²/g, measured by the BET method; and (iii) the total amount of iron and manganese compounds not exceeding 0.02 percent by weight in the metal specifications; and similar composition of synthetic resins; and objects derived from the printing of such objects.

Claims (16)

1. The composition of synthetic resins with heat resistance and flame retardancy shall consist of (a) synthetic resin and (b) magnesium hydroxide particles packed in a ratio of 15 to 80% by weight relative to the total weight of (a) and (b) magnesium hydroxide particles which (i) have a mean diameter of secondary particles, when measured by the diffraction scuttering method, not exceeding 2 microns, (ii) a specific surface area not exceeding 20 m²/g measured by the BET method, and (iii) the total amount of iron compounds and manganese compounds not exceeding 0.02% by weight in accordance with the metal specifications. 2. The composition of the synthetic resin according to claim 1 in which the magnesium hydroxide particles have an average secondary particle diameter between 0.4 and 1.0 microns when measured by the laser diffraction scathing method. 3. The composition of synthetic resins according to claim 1 or 2 in which the magnesium hydroxide particles have a specific surface area between 1 and 10 m²/g when measured by the BET method. 4. The composition of the synthetic resin under any one of the claims 1-3 shall be such that the magnesium hydroxide particles are packed with a total amount of iron compounds and manganese compounds not exceeding 0.01% by weight in accordance with the metal specifications. 5. The composition of the synthetic resin as per claims 1-3 shall, in which the magnesium hydroxide particles shall be packed with a total amount of iron compounds and manganese compounds, cobalt compounds, chromium compounds, copper compounds, vandium compounds and nickel compounds not exceeding 0.02% by weight in accordance with the metal specifications. 6. The composition of the synthetic resin as per any of the claims 1-5 includes magnesium hydroxide particles packed at a ratio of 20 to 70 percent by weight relative to the weight of the synthetic resin and magnesium hydroxide particles. 7. Any one of the components of the synthetic resins under claims 1-6 is a polyolefin or a copolymer of that resin. 8. The composition of the synthetic resin pursuant to any of the claims 1-7 shall have magnesium hydroxide particles surface-modified with at least one surface modifier selected from a group of highly fatty acid, anionic surfactants, phosphoric acid esters, binders, and esters of polyhydric alcohols and fatty acids. 9. The composition of any of the synthetic resins under claims 1-8 shall subsequently contain (c) a flame retardant in a ratio of 0.5 to 20 percent by weight depending on the total weight of (a) the synthetic resin and (b) of magnesium hydroxide. 10. The composition of synthetic resins under claim 9 in which the flame retardant is red phosphorus, charcoal powder, or a mixture thereof. 11. Flame retardants are composed of magnesium hydroxide particles which (i) have an average secondary particle diameter, when measured by the laser diffraction scuttering method, not exceeding 2 microns, (ii) have a specific surface area not exceeding 20 m²/g, measured by the BET method, and are compounded with (iii) the total amount of iron compounds and manganese compounds not exceeding 0.02% by weight in the Metals Specification. 12. Flame retardant of claim 11 in which the magnesium hydroxide particles have an average secondary particle diameter between 0.4 and 1.0 microns when measured by laser diffraction scuttering. 13. Flame retardants of claim 11 or 12 where the magnesium hydroxide particles have a specific surface area between 1 and 10 m²/g when measured by the BET method. 14. Flame retardants of any one of the claims 11-13 where the magnesium hydroxide particles contain a total amount of iron and manganese compounds not exceeding 0.01 percent by weight in accordance with the metal specifications. 15. Flame retardants of any one of the claims 11-13 shall contain magnesium hydroxide particles containing a total amount of iron compounds, manganese compounds, cobalt compounds, chromium compounds, copper compounds, vanadium compounds, and nickel compounds not exceeding 0.02 percent by weight in accordance with the metal specifications. 16. Materials obtained by molding (molded) of synthetic resin components as specified in any of the claims 1-10.