Wrapping materials for photographic materials comprising laminated layers of a paper support and at least one thermoplastic resin layer superposed on at least one surface of said paper support; said thermoplastic resin layer comprises a blended resin of (a) a high-density polyethylene having a density of 0.950 g/cm.sup.3 or more and a melt index of 10-40 and (b) a low-density polyethylene having a density of 0.930 g/cm.sup.3 or less and a melt index of 1-40, the weight ratio of (b)/(a) being 70/30-5/95, preferably 70/30-20/80, more preferably 60/40-40/60. At least one layer of said wrapping materials optionally comprises light-shielding substance in an amount of 1.0-30 g/m.sup.2.
A water-resistant support material for light-sensitive materials is disclosed, which is coated on one side or two sides with a polyolefin resin. At least the polyolefin resin of the front-side coating is a copolymer of ethylene and a non-ethylene .alpha.-olefin. This copolymer allows to add to the coating mass a high content in light-reflecting white pigment.
The present invention is a backing paper for photographic roll film. The backing paper includes a paper base having a first side and a second side. Superposed on the first side of the paper base is an antistatic opacifying layer which includes polyethylene and at least 10 weight percent of conductive carbon black particles, the carbon black particles having a surface chemistry of less than 1.5 percent by weight.
A packaging material for photosensitive materials comprising a combination of a linear very low density polyethylene resin and a high density polyethylene resin as the resin components. The linear very low density polyethylene resin improves flexibility, low temperature resistance, heat sealing properties and physical strength such as impact puncture strength and tear strength. The polyethylene resin exhibits antiblocking property. The packaging material of the invention is excellent in flexibility, low temperature resistance and impact puncture strength, and blocking does not occur. Since the dispersibility of carbon black is excellent, lump generation troubles and fish eye troubles are rare. Moreover, low temperature heat sealability is excellent.
Disclosed is a olefin resin composition comprising a propylene resin (PP) and an ethylene resin (PE) at a PP:PE mixing ratio of 97 to 60:3 to 40 by weight, the propylene resin and the ethylene resin having such dynamic melt viscoelasticity that the PE to PP viscosity ratio, i.e., .eta.r=.eta.PE/.eta.PP, is more than or equal to 0.1 and less than 1 at 1 rad/sec and more than or equal to 0.70 at 100 rad/sec and that the difference of modulus of melt elasticity between PP and PE, i.e., .DELTA.G'=GPP-GPE, is 10000 Pa or more; an olefin sheet comprising the olefin resin composition; and an olefin resin laminated sheet having a surface layer and an intermediate layer in which the intermediate layer comprises the olefin resin composition.
A paper material for photosensitive materials consisting essentially of a paper support and a coextruded multilayer extrusion laminating layer laminated onto the paper support. The coextruded multilayer extrusion laminating layer has an adhesive layer comprising less than 5 wt. % of carbon black and 5 to 90 wt. % of acid-modified adhesive polyolefin resin that is adhered to the paper support and a surface layer comprising less than 3 wt. % of carbon black and more than 10 wt. % of ethylene copolymer resin. The paper material does not induce fogging, sensitivity deviation or the like upon photosensitive materials and has a great adhesive force between the paper support and the resin layer. A method for producing the paper material. is also disclosed.
