The present disclosure relates to a solid catalyst component for the polymerization of olefins comprising Mg, Ti and an electron donor of the formula (I): ##STR00001##
where each Q is a group COOR.sup.1, in which R.sup.1 is selected from C.sub.1-C.sub.15 hydrocarbon groups, optionally containing a heteroatom selected from the group consisting of halogens, P, S, N and O; or a group CON(R.sup.2).sub.2, in which R.sup.2 groups, equal to or different from each other, are hydrogen or R.sup.1 groups which can be fused together to form one or more cycles, and A is a bivalent bridging group with the proviso that the Q groups cannot be simultaneously a group COOR.sup.1 or CON(R.sup.2).sub.2.

The present disclosure relates to a solid catalyst component for the polymerization of olefins comprising Mg, Ti and an electron donor of the formula (I): ##STR00001##
where each Q is a group COOR.sup.1, in which R.sup.1 is selected from C.sub.1-C.sub.15 hydrocarbon groups, optionally containing a heteroatom selected from the group consisting of halogens, P, S, N and O; or a group CON(R.sup.2).sub.2, in which R.sup.2 groups, equal to or different from each other, are hydrogen or R.sup.1 groups which can be fused together to form one or more cycles, and A is a bivalent bridging group with the proviso that the Q groups cannot be simultaneously a group COOR.sup.1 or CON(R.sup.2).sub.2.

A polymer matrix film useful in the preparation of a polymer absorption sensor. The polymer matrix film includes at least one first polymeric material which is elastomeric in nature, at least one second polymeric material which is crystalline and/or

A polymer matrix film useful in the preparation of a polymer absorption sensor. The polymer matrix film includes at least one first polymeric material which is elastomeric in nature, at least one second polymeric material which is crystalline and/or

A halogen-free flame-retardant insulation composition including: halogen-free resin serving as base resin; and a flame-retardant agent. The halogen-free resin includes: first polyolefin resin having a melting point of 90 to 170 C.; and second polyolefin resin having a melting point of 50 to 80 C. Content of the flame-retardant agent is 100 to 200 parts by weight with respect to 100 parts by weight of the base resin, and an insulating sample formed of the insulation composition has an elongation rate of 125% or more.

A halogen-free flame-retardant insulation composition including: halogen-free resin serving as base resin; and a flame-retardant agent. The halogen-free resin includes: first polyolefin resin having a melting point of 90 to 170 C.; and second polyolefin resin having a melting point of 50 to 80 C. Content of the flame-retardant agent is 100 to 200 parts by weight with respect to 100 parts by weight of the base resin, and an insulating sample formed of the insulation composition has an elongation rate of 125% or more.

The present invention relates to polymeric compositions comprising polylactic acid (PLA), polyolefin, and, optionally, a non reactive melt strength enhancing additive (NRMSEA), as well as articles molded from the compositions and a method of making the compositions.

The present invention provides a polymerizable composition having excellent solubility and high storage stability with no precipitation of crystals or the like, and provides a polymerizable composition that is unlikely to develop unevenness when a polymer of the composition is produced and is unlikely to deteriorate the appearance due to offset of the surfactant. Also provided are a polymer, optically anisotropic body, display element, light-emitting element, and the like using the polymerizable composition. Specifically, provided is a polymerizable composition a) one or more polymerizable compounds having one polymerizable group or two or more polymerizable groups that satisfy formula (I) Re(450 nm)/Re(550 nm)<1.0 (I) and b) a surfactant having a weight average molecular weight of 5000 or higher. Also provided are a polymer, optically anisotropic body, display element, light-emitting element, and the like using the polymerizable composition.

The present invention provides a polymerizable composition having excellent solubility and high storage stability with no precipitation of crystals or the like, and provides a polymerizable composition that is unlikely to develop unevenness when a polymer of the composition is produced and is unlikely to deteriorate the appearance due to offset of the surfactant. Also provided are a polymer, optically anisotropic body, display element, light-emitting element, and the like using the polymerizable composition. Specifically, provided is a polymerizable composition a) one or more polymerizable compounds having one polymerizable group or two or more polymerizable groups that satisfy formula (I) Re(450 nm)/Re(550 nm)<1.0 (I) and b) a surfactant having a weight average molecular weight of 5000 or higher. Also provided are a polymer, optically anisotropic body, display element, light-emitting element, and the like using the polymerizable composition.

Provided is silica powder that, when used as a resin filler such as a semiconductor sealant, allows for obtaining a resin composition having excellent gap permeability and low viscosity. The silica powder is such that (1) a cumulative 50% mass diameter D.sub.50 of a mass-based particle size distribution obtained by a centrifugal sedimentation method is 300 nm to 500 nm (preferably, 330 nm to 400 nm), (2) a loose bulk density is 250 kg/m.sup.3 to 400 kg/m.sup.3 (preferably, 270 kg/m.sup.3 to 350 kg/m.sup.3), and (3) {(D.sub.90?D.sub.50)/D.sub.50}?100 is 30% to 45%. In a silica production method in which a silicon compound is burned, silica powder can be produced by installing a burner having a concentric multiple pipe structure of three or more pipes in a reactor which has a cooling jacket portion provided around the burner, and adjusting flame combustion conditions and cooling conditions.