Photographic paper supports coated with a polyester.

摘要

A paper sheet is coated by melt extrusion with a coating of (a) a mixture of (1) polyethylene terephthalate or a copolymer thereof, optionally with up to 50 wt% of other polymers and (2) titanium oxide particles, or (b) (1) a polyester, which is a homo- or copolymer or mixture thereof, e.g. polyethylene terephthalate, (2) a polyolefin, preferably polyethylene, and (3) titanium dioxide particles. The weight ratio of the polymer(s) to the TiO2 is preferably 98:2 to 50:50. The weight ratio of (a) the polyester to the polyolefin is generally 70:30 to 99.9:0.2. The mixture is coated on at least one surface; a polyolefin can be coated on the back surface; on the coating a photographic emulsion is then coated.