Abstract: According to the method of the present invention, the clean gas is supplied between the support and the plate-like body to form the pressurized space, thereby preventing the surface of the support from being exposed to dust and allowing a conveyance path to be maintained at desired cleanliness. Specifically, the pressurized space between the support and the plate-like body is at the atmospheric pressure or higher, thereby preventing dust from being introduced.

Abstract: A multi-layer film having an intermediate layer containing, as a main component, a mixture of two kinds of specific linear low density polyethylenes, and innermost and outermost layers containing, as a main component, a mixture of a specific high pressure process polyethylene, a specific ethylene-.alpha.-olefin copolymer and a specific linear low density polyethylene. The film has an automatic packaging machine applicability and an excellent heat sealability at low temperatures without defects such as lowering of tuck in property, stretchability in the transverse direction and film slipping property and blocking, and is suitably employed as films for stretch packaging and shrink packaging which are used for prepackaging of retailed goods, mainly foods.

Abstract: A heat shrinkable polyolefin laminate film having surface layers made of a crystalline polypropylene resin, and an intermediate layer made of an ethylene resin composition consisting essentially of a linear low density polyethylene and a syndiotactic polypropylene, which is stretched at least two times in the machine and transverse directions, respectively, and which does not cause lowering of the transparency even if recovered films are incorporated into the intermediate layer, is excellent in low temperature shrinkability and packaging machine applicability, and is suitably used as a heat shrinkable packaging material.

Abstract: The heat shrinkable polypropylene film having an isotactic polypropylene layer as surface layers and a layer mainly composed of a syndiotactic polypropylene as an intermediate layer, having a shrinkage of not less than 25% at 100.degree. C. in the machine and transverse directions and being stretched at least two times in the machine and transverse directions, respectively. The film has a good packaging machine applicability and excellent propagation tear resistance, low temperature shrinkability and heat resistance, and is suitably used as a shrink packaging material.

Abstract: The present invention relates to a biaxially stretched film whose main component is a linear low density polyethylene showing, in measurement of a melting point by a differential scanning calorimeter, a main peak temperature (Tma) within the range of 118.degree..+-.5.degree. C. in a melting curve obtained when after a temperature of the polyethylene is kept at 190.degree. C. for 30 minutes, the temperature is dropped down to 20.degree. C. at a cooling rate of 100.degree. C./minute and subsequently raised at a heating rate of 10.degree. C./minute (hereinafter referred to as "melting curve after rapidly cooling") and showing a temperature difference between Tma and Tmb of at least 3.degree. C. wherein Tmb is a main peak temperature in a melting curve obtained when after the temperature of the polyethylene is kept at 190.degree. C. for 30 minutes, the temperature is dropped down to 20.degree. C. at a cooling rate of 10.degree. C./minute and subsequently raised at a heating rate of 10.degree. C.

Abstract: A stretchable, heat shrinkable ethylene-.alpha.-olefin copolymer film which has excellent stretchability as well as shrinkability at a low temperature and is useful as a good packaging material is prepared by melt extruding a composition including at least one ethylene-.alpha.-olefin copolymer as a main component to give a non-stretched film and biaxially stretching the film in a temperature region where an orientation can be induced and at an area stretching ratio of not less than 8 under conditions such that a tensile strength is from 30 to 170 kg/cm.sup.2. The film has an index of refraction N of 1.500 to 1.522, a degree of orientation Wk according to X-ray diffraction method of 0.78 to 0.93 and an area shrinkage of not less than 15% at 90.degree. C.

Abstract: A process for preparing a heat shrinkable film which is made from a copolymer of ethylene and 0.5 to 10% by mole of an .alpha.-olefin having 4 to 12 carbon atoms, the copolymer having a g* value (i.e., intrinsic viscosity of the copolymer/intrinsic viscosity of a linear polyethylene having the same molecular weight) of 0.3 to 0.7, a melt index of 0.3 to 2.0 g/10 min., and a density at 25.degree. C. of 0.86 to 0.92 g/cm.sup.3, wherein a tubular film of the copolymer is stretched under the following conditions:(A) the film surface temperature at the starting point of expansion being within the range of 20.degree. to 30.degree. C.

Abstract: A process for preparing N.sup.6, 9-disubstituted adenines which comprises reacting a metal salt of N.sup.6 -substituted adenine with a benzyl halide compound, preferably in the presence of a phase transfer catalyst. According to the process, the N.sup.6,9-disubstuted adenines can be obtained in high yields and good selectivity.

Abstract: A biaxially stretched film of an ethylene copolymer, preferably a mixture of (A) 90 to 50% by weight of a linear ethylene-.alpha.-olefin copolymer having a density of 0.90 to 0.93 g/cm.sup.3 at 25.degree. C. and a melt index of 0.2 to 3.0 g/10 min. and (B) 10 to 50% by weight of an ethylene polymer having a density of 0.87 to 0.91 g/cm.sup.3 at 25.degree. C. and less than the density of the copolymer (A) by at least 0.014 g/cm.sup.3 and a melt index of 0.2 to 5.0 g/10 min., said copolymer or copolymer mixture giving a DSC curve with an endothermic area under the temperature lower than its melting temperature (main endothermic peak temperature) by 10.degree. C. accounting for at leat 55% of the total endothermic area. The stretched film is little varying in thickness and is excellent in heat shrinkability at low temperature.

Abstract: An extraction residue obtained by solvent deasphalting of a residual oil is mixed with a carrier gas and thermally cracked at a temperature of 400.degree. C. to 600.degree. C. in a tube-type cracking apparatus to obtain cracked oil and pitch. The use of the carrier gas, which may be either an inert gas such as nitrogen or a reactive gas such as hydrogen, permits a flow velocity through the cracking apparatus sufficient to substantially prevent coking. Preferably, the cracking conditions are controlled so that the yield of cracked oil is not more than about 30 to 35%.