Opaque voided films having a total luminous transmission not exceeding 25% are made from blends of a polyester preferably polyethylene terephthalate, with 3 to 27% of an ethylene or propylene polymer, prepared by dry blending. One end use of the film, as a base for photographic prints is also described.

Opaque molecularly oriented and heat set linear polyester film and process for making same

This invention relates to substantially transparent solid solution polymer blends having improved hydrolytic stability, and flexibility which comprise, in admixture, (1) a linear aromatic polyester of a dicarboxylic acid and a bisphenol, and (2) a linear aromatic polysulfonate of a bisphenol and a disulfonic acid. The polyblends are useful in preparation of films and molded articles.

Polymer blends with improved hydrolytic stability

Opaque voided films having a total luminous transmission not exceeding 25% are made from blends of a polyester preferably polyethylene terephthalate, with 3 to 27% of an ethylene or propylene polymer, prepared by dry blending One end use of the film, as a base for photographic prints is also described

Voided films of polyester with polyolefin particles

A method of preparing a sheet of material for bending along a bend line comprising the step of forming of at least one displacement in the thickness direction of the sheet of material with a portion of the periphery of the displacement closest to the bend line providing an edge and opposed face configured in position to produce edge-to-face engagement of the sheet on opposite sides of the periphery during bending. The forming step is preferably accomplished using one of a stamping process, a punching process, a roll-forming process and an embossing process. A sheet of material suitable for bending using the process also is disclosed, as are the use of coatings, shin guards and displacing the area of the sheet between bending inducing slits.

Sheet material with bend controlling displacements and method for forming the same

A security document comprising a plurality of self-supporting polymeric films and layers therebetween and thereon, said plurality of self-supporting polymeric films comprising a non-transparent microvoided axially stretched self-supporting polymeric film exclusive of foam and having a permanent transparent pattern; and a process for producing a security document with a permanent transparent pattern comprising the step of: image-wise application of heat optionally supplemented by the application of pressure to a security document precursor comprising a plurality of self- supporting polymeric films and layers therebetween and thereon, said plurality of self-supporting polymeric films comprising a non- transparent microvoided axially stretched self-supporting polymeric film exclusive of foam.

Security document with a transparent pattern and a process for producing a security document with a transparent pattern

SYNTHETIC WRITING SHEET MADE FROM A LINEAR POLYESTER AND A HIGH POLYMER HAVING A HIGHER GLASS TRANSITION POINT THAN THAT OF THE LINEAR POLYESTER BY MIXING THEM UNIFORMLY, FORMING THE POLYMER MIXTURE INTO FILM, AND STRETCHING THE FILM.

H Nagamatsu

Papers

Polyester high polymer synthetic paper for writing