Provided are: a rubber composition for treads which contains a diene rubber in the rubber component and can simultaneously achieve blowing resistance during dry running, wet grip performance and abrasion resistance; and a pneumatic tire including a tread formed from the rubber composition for treads. The rubber composition contains: a diene rubber including styrene-butadiene rubber; zinc dithiophosphate; an inorganic filler including at least one selected from the group consisting of: a compound of the formula: mM.xSiO.sub.y.zH.sub.2O wherein M represents at least one metal selected from the group consisting of Al, Mg, Ti, Ca, and Zr, or an oxide or hydroxide of the metal, m represents an integer of 1-5, x represents an integer of 0-10, y represents an integer of 2-5, and z represents an integer of 0-10; magnesium sulfate; and silicon carbide, and having a BET value of 5-120 m.sup.2/g and a linseed oil absorption of 30-80 mL/100 g; and sulfur, wherein, per 100 parts by mass of the diene rubber, there are 0.2-15 parts by mass of the zinc dithiophosphate, 1-70 parts by mass of the inorganic filler, and less than 2.5 parts by mass of zinc oxide.

A flame-retardant epoxy resin composition wherein (A) epoxy resin, (B) a curing agent and (C) a phosphorous-containing compound expressed by the following general formula (1) are contained; a prepreg using the same and a laminated plate using said prepreg;

##STR00001##

wherein m expresses an integer from 2 to 10, R.sup.1 and R.sup.2 each independently express an alkyl group or an aryl group, R.sup.3 expresses a hydrocarbon group that may contain an oxygen atom, a sulfur atom or a nitrogen atom, X expresses an oxygen atom or a sulfur atom, Y expresses an oxygen atom, a sulfur atom or NR.sup.4, and in this regard, R.sup.4 expresses a hydrogen atom, an alkyl group or an aryl group.

A flame-retardant epoxy resin composition wherein (A) epoxy resin, (B) a curing agent and (C) a phosphorous-containing compound expressed by the following general formula (1) are contained; a prepreg using the same and a laminated plate using said prepreg;

##STR00001##

wherein m expresses an integer from 2 to 10, R.sup.1 and R.sup.2 each independently express an alkyl group or an aryl group, R.sup.3 expresses a hydrocarbon group that may contain an oxygen atom, a sulfur atom or a nitrogen atom, X expresses an oxygen atom or a sulfur atom, Y expresses an oxygen atom, a sulfur atom or NR.sup.4, and in this regard, R.sup.4 expresses a hydrogen atom, an alkyl group or an aryl group.

Provided are an organic silicon resin composition, prepreg and laminate using the same. The organic silicon resin composition glue solution contains a condensation silicon resin, a catalyst, an auxiliary agent, a white filler and a solvent as necessary components, and is impregnated in a reinforced material such as a sheet-like fiberglass fiber base material and then dried to prepare the prepreg. The prepreg has a net structure via crosslinking of the silicon resin using a condensation reaction. Since the organic silicon resin has ultrahigh heat resistance and yellowing resistance, the present invention applies the silicon resin to a white LED copper-clad laminate instead of a traditional organic resin, satisfying the demand for high heat resistance, and replacing the ceramic substrate to be a new heat-dissipating substrate base material.

Provided are: a rubber composition for treads having high grip performance, abrasion resistance, and tensile properties and capable of reducing the occurrence of blowing even during high-temperature running although it is a high softener content composition incorporating at least a certain amount of a softener with a rubber component including diene rubber; and a pneumatic tire including a tread formed from the rubber composition for treads. Included is a rubber composition for treads containing: a diene rubber including styrene-butadiene rubber; at least one softener selected from the group consisting of low temperature plasticizers, process oils, and resins having a softening point of 160 C. or lower; zinc dithiophosphate; and sulfur, wherein, per 100 parts by mass of the diene rubber, there are 40 parts by mass or more of the softener, 0.2-15 parts by mass of the zinc dithiophosphate, and less than 2.5 parts by mass of zinc oxide.

Provided are: a rubber composition for treads having high grip performance, abrasion resistance, and tensile properties and capable of reducing the occurrence of blowing even during high-temperature running although it is a high softener content composition incorporating at least a certain amount of a softener with a rubber component including diene rubber; and a pneumatic tire including a tread formed from the rubber composition for treads. Included is a rubber composition for treads containing: a diene rubber including styrene-butadiene rubber; at least one softener selected from the group consisting of low temperature plasticizers, process oils, and resins having a softening point of 160 C. or lower; zinc dithiophosphate; and sulfur, wherein, per 100 parts by mass of the diene rubber, there are 40 parts by mass or more of the softener, 0.2-15 parts by mass of the zinc dithiophosphate, and less than 2.5 parts by mass of zinc oxide.

A process for regenerating sulfur-crosslinked rubber vulcanizates to regenerates, wherein at least one regenerating agent is used in the regeneration. The regenerating agent is selected from the group consisting of dithiophosphoryl polysulfides and/or silanes having a polysulfane group. Regenerates which have been produced by means of the process lead to improved or equal rolling resistance indicators and a lower compression set in vulcanized rubber mixtures compared to regenerates known in the prior art.

The invention relates to novel and improved halogen-free flame retardant compounds having the structure of Formula (I): wherein: R.sup.1 and R.sup.2 are independently hydrogen, C.sub.1-C.sub.6 alkyl, P(O)(OR.sup.3).sub.2, P(O)OR.sup.3R.sup.4, or P(O)R.sup.3.sub.2, wherein R.sup.3 and R.sup.4 are independently C.sub.1-C.sub.4 alkyl, C.sub.6-C.sub.12 aryl, C.sub.7-C.sub.15 aralkyl or C.sub.7-C.sub.15 alkaryl; or R.sup.1 and R.sup.2 taken together form an unsaturated cyclic ring, which is optionally substituted by an alkyl group; each k is independently an integer from 1 to 2; each X is independently oxygen (O) or sulphur (S); v is 0 or 1; each Y is independently C.sub.1-C.sub.4 alkylene, C.sub.6 arylene, C.sub.7-C.sub.15 aralkylene, C.sub.7-C.sub.15 alkarylene, oxygen (O), nitrogen (NR), wherein R is H or C.sub.1-C.sub.4 alkyl; n is 0, 1 or 2 with the proviso that n is 1 when Y is oxygen (O) or nitrogen (NR); each Z is independently C.sub.1-C.sub.4 alkylene, C.sub.6 arylene, C.sub.7-C.sub.15 aralkylene or C.sub.7-C.sub.15 is alkarylene; m is independently 0, 1 or 2; with the proviso that when Y is oxygen (O) or nitrogen (N), m cannot be 0; each Q is independently C.sub.1-C.sub.4 alkylene; t is an integer from 1 to 2; W is oxygen (O) or sulphur (S). The compounds are particularly suited as flame retardant additives for thermoplastic polyesters.

The invention relates to novel and improved halogen-free flame retardant compounds having the structure of Formula (I): wherein: R.sup.1 and R.sup.2 are independently hydrogen, C.sub.1-C.sub.6 alkyl, P(O)(OR.sup.3).sub.2, P(O)OR.sup.3R.sup.4, or P(O)R.sup.3.sub.2, wherein R.sup.3 and R.sup.4 are independently C.sub.1-C.sub.4 alkyl, C.sub.6-C.sub.12 aryl, C.sub.7-C.sub.15 aralkyl or C.sub.7-C.sub.15 alkaryl; or R.sup.1 and R.sup.2 taken together form an unsaturated cyclic ring, which is optionally substituted by an alkyl group; each k is independently an integer from 1 to 2; each X is independently oxygen (O) or sulphur (S); v is 0 or 1; each Y is independently C.sub.1-C.sub.4 alkylene, C.sub.6 arylene, C.sub.7-C.sub.15 aralkylene, C.sub.7-C.sub.15 alkarylene, oxygen (O), nitrogen (NR), wherein R is H or C.sub.1-C.sub.4 alkyl; n is 0, 1 or 2 with the proviso that n is 1 when Y is oxygen (O) or nitrogen (NR); each Z is independently C.sub.1-C.sub.4 alkylene, C.sub.6 arylene, C.sub.7-C.sub.15 aralkylene or C.sub.7-C.sub.15 is alkarylene; m is independently 0, 1 or 2; with the proviso that when Y is oxygen (O) or nitrogen (N), m cannot be 0; each Q is independently C.sub.1-C.sub.4 alkylene; t is an integer from 1 to 2; W is oxygen (O) or sulphur (S). The compounds are particularly suited as flame retardant additives for thermoplastic polyesters.

The invention relates to novel and improved halogen-free flame retardant compounds having the structure of Formula (I): wherein: R.sup.1 and R.sup.2 are independently hydrogen, C.sub.1-C.sub.6 alkyl, P(O)(OR.sup.3).sub.2, P(O)OR.sup.3R.sup.4, or P(O)R.sup.3.sub.2, wherein R.sup.3 and R.sup.4 are independently C.sub.1-C.sub.4 alkyl, C.sub.6-C.sub.12 aryl, C.sub.7-C.sub.15 aralkyl or C.sub.7-C.sub.15 alkaryl; or R.sup.1 and R.sup.2 taken together form an unsaturated cyclic ring, which is optionally substituted by an alkyl group; each k is independently an integer from 1 to 2; each X is independently oxygen (O) or sulphur (S); v is 0 or 1; each Y is independently C.sub.1-C.sub.4 alkylene, C.sub.6 arylene, C.sub.7-C.sub.15 aralkylene, C.sub.7-C.sub.15 alkarylene, oxygen (O), nitrogen (NR), wherein R is H or C.sub.1-C.sub.4 alkyl; n is 0, 1 or 2 with the proviso that n is 1 when Y is oxygen (O) or nitrogen (NR); each Z is independently C.sub.1-C.sub.4 alkylene, C.sub.6 arylene, C.sub.7-C.sub.15 aralkylene or C.sub.7-C.sub.15 is alkarylene; m is independently 0, 1 or 2; with the proviso that when Y is oxygen (O) or nitrogen (N), m cannot be 0; each Q is independently C.sub.1-C.sub.4 alkylene; t is an integer from 1 to 2; W is oxygen (O) or sulphur (S). The compounds are particularly suited as flame retardant additives for thermoplastic polyesters.