Abstract: The present invention relates to a phosphazene compound and a prepreg and a composite metal laminate. The phosphazene compound has a structure as shown in Formula (I). The present invention obtains a phosphazene compound using an M group having specific components. The composite metal laminates prepared by the epoxy resin composition comprising the phosphazene compound have low dielectric properties, good heat resistance and mechanical properties and is a low dielectric material also having great economic properties and being environmental friendly.

Abstract: The present invention relates to a phosphazene compound and a composite metal laminate. The phosphazene compound with a partial structure of carboxylic esters has a structure as shown in Formula (I). The present invention obtains a phosphazene compound with a partial structure of carboxylic esters using an M group having specific components. The cured products of the phosphazene compound have good flame retardancy, heat resistance, mechanical properties, flame retardancy, and low dielectric constant, and are a low dielectric flame retardant material having great economic properties and being environmental friendly.

Abstract: The present invention provides a composite flame retardant, a flame retardant resin composition, a composite metal substrate, a flame retardant electronic material and a flame retardant engineering plastic, wherein the composite flame retardant comprises a bromine-containing flame retardant, as well as a sulfur-containing flame retardant and/or a phosphorus-containing flame retardant; said bromine-containing flame retardant is a bromine-containing phenol compound and epoxy resins thereof. The bromine-containing flame retardant has a synergistic effect on the flame retardant effect with the sulfur-containing flame retardant and/or the phosphorus-containing flame retardant, thereby enhancing the flame retardancy of the composite flame retardant and further enhancing the flame retardancy of the resin composition of the present invention.

Abstract: The present invention provides a flame-retardant resin composition, a thermosetting resin composition, a flame-retardant engineering plastic and a composite metal substrate. The flame-retardant resin composition comprises a sulfur-containing flame retardant, a phosphorus-containing flame retardant and/or a nitrogen-containing flame retardant, and a halogen-free epoxy resin. The sulfur-containing flame retardant, phosphorus-containing flame retardant and nitrogen-containing flame retardant in the flame-retardant resin composition of the present invention play a synergistic effect, making the prepared copper clad laminate have good flame retardancy, and also good heat resistance, water resistance, adhesion, mechanical properties and electrical properties, and making the prepared engineering plastic have good flame retardancy and good mechanical properties, and thus the flame-retardant resin composition of the present invention is a kind of flame-retardant composition with large economy and friendly environment.

Abstract: The present invention provides a flame retardant resin composition, a thermosetting resin composition, a composite metal substrate and a flame retardant electronic material, wherein the flame retardant composition comprises a sulfur-containing flame retardant, a phosphorus-containing flame retardant and/or a nitrogen-containing flame retardant, and a halogen-free epoxy resin. The synergistic effect of the sulfur-containing flame retardant, phosphorus-containing flame retardant and nitrogen-containing flame retardant in the flame retardant composition of the present invention makes the resultant copper-clad laminate have better heat resistance, water resistance, adhesion, mechanical properties and electrical properties, while having better flame retardancy.

Abstract: The present invention provides a flame-retardant engineering plastic and a preparation method thereof. The flame-retardant engineering plastic contains a halogen-free flame retardant represented by the formula I as a component of raw materials. The addition of the flame retardant gives good flame retardancy and excellent mechanical properties to the engineered plastic. The engineering plastic is prepared by the raw materials comprising the following components in parts by mass: 40-60 parts of PC, 20-40 parts of epoxy resin, 10-20 parts of ABS and 5-15 parts of flame retardant. The engineering plastic prepared by the present invention has a bending strength which can be up to 82.4-84 MPa, a tensile strength of up to 65.7-66.6 MPa, a notched impact strength of up to 26.3-27 J/m, a melt index of 12.6-15, and an oxygen index of 26.2-27.5%, and thus has excellent mechanical properties and good flame retardancy.

Abstract: The present invention relates to a phosphazene compound containing an ester group having a structure of formula (I). The present invention grafts ester groups to phosphazene compounds and makes terminal grafted hydroxyl and carboxyl groups reacted with polymer matrix, producing an improvement of flame retardancy and a reduction of dielectric constant at the same time when the phosphazene compound is introduced into polymer matrix. Since N and P atoms are directly bonded into the polymer matrix by a reaction rather than addition and combination means in the prior art, there is no reduced mechanical properties of the matrix due to the addition of flame retardants.

Abstract: The present invention relates to an isocyanate-modified epoxy resin having a structure of Formula (I): in Formula (I), R is selected from divalent organic groups; n is an integer greater than or equal to zero; in Y, R1, R2, R3, R4, R18, R19, R20, R21 are independently selected from organic groups; X is omitted or is selected from divalent organic groups; and R1, R2, R3, R4, R18, R19, R20, R21 are not hydrogen atoms at the same time. The epoxy resin of the present invention utilizes polyisocyanate containing more than 2 cyanate groups as a raw material for preparation and reacts it with resin monomer having epoxy group, thereby achieving the purpose of introducing oxazolidinonyl into epoxy resin monomer; in addition, the epoxy resin of the present invention is terminated by epoxy groups, making the provided epoxy resin components have high heat resistance and low dielectric properties.

Abstract: The present invention relates to a phosphazene compound comprising cyano group having a molecular structure of Formula (I); wherein, Y and Y? are independently selected from organic groups; M1 and M2 are independently selected from phosphazene groups, and M1 contains m1 phosphorus atoms, and M2 contains m2 phosphorus atoms; X1, X1?, X2, X3 and X4 are independently selected from any one of the sixth main-group elements; R and R? are independently selected from divalent organic groups; a is an integer greater than or equal to 0; b is an integer greater than or equal to 1; and c is an integer greater than or equal to 0; and a+b=2m1, d+2=2m2. The present invention achieves a synergistic effect with P and N of phosphazene group by introducing cyano group to the phosphazene group, and thus improves thermal stability and flame retardancy of the phosphazene compound, and the compatibility thereof with other components is excellent.

Abstract: The present invention relates to a phosphazene compound and a prepreg and a composite metal laminate. The phosphazene compound has a structure as shown in Formula (I). The present invention obtains a phosphazene compound using an M group having specific components. The composite metal laminates prepared by the epoxy resin composition comprising the phosphazene compound have low dielectric properties, good heat resistance and mechanical properties and is a low dielectric material also having great economic properties and being environmental friendly.

Abstract: The present invention relates to a phosphazene compound and a composite metal laminate. The phosphazene compound with a partial structure of carboxylic esters has a structure as shown in Formula (I). The present invention obtains a phosphazene compound with a partial structure of carboxylic esters using an M group having specific components. The cured products of the phosphazene compound have good flame retardancy, heat resistance, mechanical properties, flame retardancy, and low dielectric constant, and are a low dielectric flame retardant material having great economic properties and being environmental friendly.

Abstract: The present invention relates to an epoxy resin curing agent having a structure of Formula I and preparation methods and uses thereof. The present invention makes a resin composition formed by the epoxy resin curing agent have good low dielectric properties by using an epoxy resin curing agent having a specific structure, and the cured products of the epoxy resin composition have low dielectric constant and dielectric loss and good heat resistance and are low dielectric materials having great economic properties and being environmental friendly.

Abstract: The present invention discloses flame retardant compounds, hardeners and polyphenol-based epoxy resins. In the molecular structure, such flame retardant compounds contain phenolic hydroxyl groups, and groups M of nitrogen phosphorus skeleton consisting of unsaturated phosphorous and nitrogen atoms, wherein M contains at least 50 wt % of cyclotriphosphazene groups M1, at most 48 wt % of M2, which is a cyclic ring consisting of four or more phosphazene groups, and at most 48 wt % of non-cyclic polyphosphazene groups M3. Therefore, such flame retardant compounds have better flame retardancy, and the cured products thereof have better heat resistance, water resistance, cohesiveness, mechanical property and electrical property. Additionally, such compounds can improve flame retardancy, economy and environmental friendly protection when applied in composite metal laminates and circuit boards.